Jonathan Ricardo Rosas-Ramírez, Keila Isaac-Olivé, Martín Pablo Moreno-Pérez, Gauddy Lizeth Manzanares-Leal, Jorge Humberto Serment Guerrero, Ángel H. Sandoval-Trujillo, N. Ramírez-Durán
Heavy metals released into the environment cause deterioration of environmental health. Their removal by biological means is a strategy under study. This research aimed to isolate and identify halophilic bacteria from saline-sodic soils and determine their tolerance to the metalloid As3+ and the heavy metals Cr6+, Hg2+, and Pb2+. The strains were grown on halophilic medium (HM), without and with the presence of each metal, at 10% NaCl, pH 8.0 ± 0.2, and 37 ºC. The strains with the highest tolerance to each metal were identified by 16S rRNA gene sequencing and phylogenetic analysis. The minimum inhibitory concentration (MIC) was subsequently determined. Seventy-five halophilic strains were isolated. The isolates with the highest tolerance were Salinicococcus spp. strains TX3SA-2MHG1 and TX3SA-4MHG1 [MIC (Hg2+) of 0.1 mmol/L]; Halomonas sp. strain TXO4B-1SG9 [MIC (Pb2+) of 7.0 mmol/L]; Nocardiopsis sp. strains TXO7B-1SG12 and TXV10-3SG5 [MIC (As3+) of 8.5 mmol/L], and Nocardiopsis sp. strain TXV7-8SG2 [MIC (As3+) of 27.25 mmol/L; MIC (Cr6+) 1250.0 mmol/L; MIC (Hg2+) 0.075 mmol/L and MIC (Pb2+) 7.5 mmol/L]. It was possible to obtain and identify isolates of halophilic metal tolerant bacteria.
{"title":"Identification of halophilic bacteria tolerant to heavy metals","authors":"Jonathan Ricardo Rosas-Ramírez, Keila Isaac-Olivé, Martín Pablo Moreno-Pérez, Gauddy Lizeth Manzanares-Leal, Jorge Humberto Serment Guerrero, Ángel H. Sandoval-Trujillo, N. Ramírez-Durán","doi":"10.20937/rica.54220","DOIUrl":"https://doi.org/10.20937/rica.54220","url":null,"abstract":"Heavy metals released into the environment cause deterioration of environmental health. Their removal by biological means is a strategy under study. This research aimed to isolate and identify halophilic bacteria from saline-sodic soils and determine their tolerance to the metalloid As3+ and the heavy metals Cr6+, Hg2+, and Pb2+. The strains were grown on halophilic medium (HM), without and with the presence of each metal, at 10% NaCl, pH 8.0 ± 0.2, and 37 ºC. The strains with the highest tolerance to each metal were identified by 16S rRNA gene sequencing and phylogenetic analysis. The minimum inhibitory concentration (MIC) was subsequently determined. Seventy-five halophilic strains were isolated. The isolates with the highest tolerance were Salinicococcus spp. strains TX3SA-2MHG1 and TX3SA-4MHG1 [MIC (Hg2+) of 0.1 mmol/L]; Halomonas sp. strain TXO4B-1SG9 [MIC (Pb2+) of 7.0 mmol/L]; Nocardiopsis sp. strains TXO7B-1SG12 and TXV10-3SG5 [MIC (As3+) of 8.5 mmol/L], and Nocardiopsis sp. strain TXV7-8SG2 [MIC (As3+) of 27.25 mmol/L; MIC (Cr6+) 1250.0 mmol/L; MIC (Hg2+) 0.075 mmol/L and MIC (Pb2+) 7.5 mmol/L]. It was possible to obtain and identify isolates of halophilic metal tolerant bacteria.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44627418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhi Jiang, Shiyan Wang, Zhenyuan Han, Chang Liu, Liang Wang, Bei Zhu, J. Zou, Budong Li, Xiaoge Dang
The Beiyunhe River is a typical urban river in northern China, and the health status of its ecosystem is degraded by urbanization. To evaluate this health status, a survey was performed throughout the basin. Thirteen indexes were selected to construct an ecosystem health evaluation system, and a composite index method was used to quantify the Beiyunhe River’s ecosystem health. Redundancy analysis (RDA) was used to detect the key factors influencing ecosystem health. The results showed that the river’s health status was mostly moderate: of the 38 surveyed points, the health status of 10% was Good, 47% was Average, 40% was Poor, and 3% was Very Poor. The upper and middle reaches were in better health than the lower reaches, and the main stream health was better than the tributaries. Among the tributaries, Bahe River (upper and middle reaches) had the best health status, whereas Fenghe River (lower reaches) had the worst. RDA showed that the ratio of hardening of the river, number of water-blocking structures (gates and dams), and population density in the catchment area were the key factors affecting the health of the Beiyunhe River ecosystem. This study can be used as a reference for the evaluation of the health of urban river ecosystems.
{"title":"Water ecosystem health evaluation and influencing factors analysis of AN urban river: A case study at Beiyunhe River, Northern China","authors":"Zhi Jiang, Shiyan Wang, Zhenyuan Han, Chang Liu, Liang Wang, Bei Zhu, J. Zou, Budong Li, Xiaoge Dang","doi":"10.20937/rica.54378","DOIUrl":"https://doi.org/10.20937/rica.54378","url":null,"abstract":"The Beiyunhe River is a typical urban river in northern China, and the health status of its ecosystem is degraded by urbanization. To evaluate this health status, a survey was performed throughout the basin. Thirteen indexes were selected to construct an ecosystem health evaluation system, and a composite index method was used to quantify the Beiyunhe River’s ecosystem health. Redundancy analysis (RDA) was used to detect the key factors influencing ecosystem health. The results showed that the river’s health status was mostly moderate: of the 38 surveyed points, the health status of 10% was Good, 47% was Average, 40% was Poor, and 3% was Very Poor. The upper and middle reaches were in better health than the lower reaches, and the main stream health was better than the tributaries. Among the tributaries, Bahe River (upper and middle reaches) had the best health status, whereas Fenghe River (lower reaches) had the worst. RDA showed that the ratio of hardening of the river, number of water-blocking structures (gates and dams), and population density in the catchment area were the key factors affecting the health of the Beiyunhe River ecosystem. This study can be used as a reference for the evaluation of the health of urban river ecosystems.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43002401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. L. Vázquez-Castro, L. R. Reyes-Gutiérrez, Muricio Carrillo-García, Aurelio Reyes-Ramírez
El estudio consistió en estimar la capacidad protectora y vulnerabilidad intrínseca natural del acuífero de Texcoco, mediante la combinación del método Índice de Vulnerabilidad del Acuífero (AVI, por su sigla en inglés) y el parámetro geoeléctrico de Dar Zarrouk (conductancia longitudinal unitaria, S). El acuífero de Texcoco, constituido por materiales lacustres, aluviales y depósitos volcánicos, se localiza al oriente del Valle de México. Se realizaron 87 sondeos eléctricos verticales Schlumberger (SEV) distribuidos en la zona del acuífero. Los datos de los SEV en campo se adquirieron con un resistivímetro Terrameter SAS-300B con abertura de electrodos de corriente de 750 m a ambos lados de un centro común y se interpretaron con el programa de computadora IX1D de Interpex. La conductancia longitudinal unitaria se obtuvo a partir de la inversión de los datos de campo y se elaboraron mapas de contornos con el método kriging y de mínima curvatura en Surfer V16. El espesor de la capa superior de la zona no saturada varía entre 0.3 y 10.5 m. La conductancia longitudinal de la capa superior presenta valores de 0.0 a 75 Siemens/m. El nivel del agua subterránea en el acuífero presenta una elevación de 2140 msnm en la zona centro sur y 2290 msnm en las estribaciones de la Sierra de Río Frío. Con el método AVI, a partir de los datos de la conductividad hidráulica, Kv (m/d) y el espesor h (m) de la zona no saturada, se obtuvieron valores de la resistencia hidráulica C = 1.4 a 3.9 días. Los resultados obtenidos son de interés para las autoridades municipales en la planeación y toma de decisiones.
{"title":"Zonificación de la capacidad protectora y vulnerabilidad a la contaminación del acuífero de Texcoco, Estado de México","authors":"M. L. Vázquez-Castro, L. R. Reyes-Gutiérrez, Muricio Carrillo-García, Aurelio Reyes-Ramírez","doi":"10.20937/rica.54222","DOIUrl":"https://doi.org/10.20937/rica.54222","url":null,"abstract":"El estudio consistió en estimar la capacidad protectora y vulnerabilidad intrínseca natural del acuífero de Texcoco, mediante la combinación del método Índice de Vulnerabilidad del Acuífero (AVI, por su sigla en inglés) y el parámetro geoeléctrico de Dar Zarrouk (conductancia longitudinal unitaria, S). El acuífero de Texcoco, constituido por materiales lacustres, aluviales y depósitos volcánicos, se localiza al oriente del Valle de México. Se realizaron 87 sondeos eléctricos verticales Schlumberger (SEV) distribuidos en la zona del acuífero. Los datos de los SEV en campo se adquirieron con un resistivímetro Terrameter SAS-300B con abertura de electrodos de corriente de 750 m a ambos lados de un centro común y se interpretaron con el programa de computadora IX1D de Interpex. La conductancia longitudinal unitaria se obtuvo a partir de la inversión de los datos de campo y se elaboraron mapas de contornos con el método kriging y de mínima curvatura en Surfer V16. El espesor de la capa superior de la zona no saturada varía entre 0.3 y 10.5 m. La conductancia longitudinal de la capa superior presenta valores de 0.0 a 75 Siemens/m. El nivel del agua subterránea en el acuífero presenta una elevación de 2140 msnm en la zona centro sur y 2290 msnm en las estribaciones de la Sierra de Río Frío. Con el método AVI, a partir de los datos de la conductividad hidráulica, Kv (m/d) y el espesor h (m) de la zona no saturada, se obtuvieron valores de la resistencia hidráulica C = 1.4 a 3.9 días. Los resultados obtenidos son de interés para las autoridades municipales en la planeación y toma de decisiones.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46621499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xóchitl Gallardo-Monroy, H. F. Olivares-Rubio, Ángel de J. Morales-Ramírez, J. Hernández-Fernández, Celestino Odín Rodríguez-Nava
El incremento del uso de compuestos farmacéuticos es uno de los factores que ha ocasionado un impacto sobre la salud de los ambientes acuáticos. Las tecnologías convencionales de las plantas de tratamiento de aguas residuales han mostrado tener una baja eficiencia para la remoción de estos contaminantes. Para contribuir a resolver este problema, en la presente investigación se evaluó la degradación de los fármacos bezafibrato, gemfibrozil, sulfametoxazol, diclofenaco e indometacina mediante fotocatálisis heterogénea utilizando nanopartículas de óxido de zinc (ZnO) con dopaje de cobalto de 0, 1, 3 y 5 % en peso de cobalto, con diferentes concentraciones (1, 2, 5, 6 y 10 g/L) y tres temperaturas diferentes (25, 40 y 55 ºC) durante la degradación de los fármacos, bajo una radiación UV λ = 375 nm durante cuatro horas de exposición. Se encontró que el dopaje con cobalto disminuyó la velocidad de remoción de los fármacos. Además, la mayor eficiencia de remoción para todos los compuestos evaluados (98.8-100 %), se obtuvo con una concentración de 5 g/L de nanopartículas de ZnO a una temperatura de 25 ºC. Estos hallazgos resultan promisorios debido a las ventajas del ZnO en la remoción de productos farmacéuticos en aguas residuales o en hospitales en donde se realizan las formulaciones para pacientes hospitalizados. No obstante, se requiere continuar con estudios sobre condiciones similares a las reales para determinar la viabilidad de su aplicación.
{"title":"Degradación de fármacos mediante fotocatálisis con nanopartículas de ZnO","authors":"Xóchitl Gallardo-Monroy, H. F. Olivares-Rubio, Ángel de J. Morales-Ramírez, J. Hernández-Fernández, Celestino Odín Rodríguez-Nava","doi":"10.20937/rica.54497","DOIUrl":"https://doi.org/10.20937/rica.54497","url":null,"abstract":"El incremento del uso de compuestos farmacéuticos es uno de los factores que ha ocasionado un impacto sobre la salud de los ambientes acuáticos. Las tecnologías convencionales de las plantas de tratamiento de aguas residuales han mostrado tener una baja eficiencia para la remoción de estos contaminantes. Para contribuir a resolver este problema, en la presente investigación se evaluó la degradación de los fármacos bezafibrato, gemfibrozil, sulfametoxazol, diclofenaco e indometacina mediante fotocatálisis heterogénea utilizando nanopartículas de óxido de zinc (ZnO) con dopaje de cobalto de 0, 1, 3 y 5 % en peso de cobalto, con diferentes concentraciones (1, 2, 5, 6 y 10 g/L) y tres temperaturas diferentes (25, 40 y 55 ºC) durante la degradación de los fármacos, bajo una radiación UV λ = 375 nm durante cuatro horas de exposición. Se encontró que el dopaje con cobalto disminuyó la velocidad de remoción de los fármacos. Además, la mayor eficiencia de remoción para todos los compuestos evaluados (98.8-100 %), se obtuvo con una concentración de 5 g/L de nanopartículas de ZnO a una temperatura de 25 ºC. Estos hallazgos resultan promisorios debido a las ventajas del ZnO en la remoción de productos farmacéuticos en aguas residuales o en hospitales en donde se realizan las formulaciones para pacientes hospitalizados. No obstante, se requiere continuar con estudios sobre condiciones similares a las reales para determinar la viabilidad de su aplicación.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48187824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
El presente estudio expone las percepciones sociales de turistas, pobladores locales, funcionarios de gobierno, observadores de aves, pescadores y productores con relación al manejo, monitoreo, soluciones, responsabilidades y condición de la calidad del agua de la Laguna de Yuriria, Guanajuato. La información se obtuvo mediante entrevistas semiestructuradas y cuestionarios diseñados para aplicarse a distancia debido a la pandemia ocasionada por un nuevo coronavirus (COVID-19). En total, participaron 71 personas. Los datos obtenidos se procesaron a través del programa R para el Análisis de Datos Cualitativos (RQDA) y fueron agrupados en las tres dimensiones del bienestar humano (material, relacional y subjetiva). El 7.05 % del total de los entrevistados consideró que la calidad del agua es buena, el 18.30 % regular, el 42.26 % mala y el 12.67 % muy mala. El 19.72 % desconoció el tema. Los funcionarios consideran que la condición de la calidad del agua se debe a una mala gestión y administración pública. Los observadores de aves advierten que la calidad del agua es mala y que a menor calidad del agua menor biodiversidad de especies. La mayoría de los pescadores considera que la calidad del agua es regular y que la laguna mantiene la economía de sus familias y de las comunidades de La Angostura y Los Tepetates. Estas percepciones ayudaron a obtener un análisis social de la calidad del agua en la laguna y pueden derivar en el reforzamiento y la creación de estrategias para el manejo y la conservación de este cuerpo de agua.
{"title":"Percepciones sociales sobre la calidad del agua en la Laguna de Yuriria, Guanajuato, México","authors":"Ileana Jimena Granillo Suárez, Eugenia López López, Enrique Martínez y Ojeda","doi":"10.20937/rica.54612","DOIUrl":"https://doi.org/10.20937/rica.54612","url":null,"abstract":"El presente estudio expone las percepciones sociales de turistas, pobladores locales, funcionarios de gobierno, observadores de aves, pescadores y productores con relación al manejo, monitoreo, soluciones, responsabilidades y condición de la calidad del agua de la Laguna de Yuriria, Guanajuato. La información se obtuvo mediante entrevistas semiestructuradas y cuestionarios diseñados para aplicarse a distancia debido a la pandemia ocasionada por un nuevo coronavirus (COVID-19). En total, participaron 71 personas. Los datos obtenidos se procesaron a través del programa R para el Análisis de Datos Cualitativos (RQDA) y fueron agrupados en las tres dimensiones del bienestar humano (material, relacional y subjetiva). El 7.05 % del total de los entrevistados consideró que la calidad del agua es buena, el 18.30 % regular, el 42.26 % mala y el 12.67 % muy mala. El 19.72 % desconoció el tema. Los funcionarios consideran que la condición de la calidad del agua se debe a una mala gestión y administración pública. Los observadores de aves advierten que la calidad del agua es mala y que a menor calidad del agua menor biodiversidad de especies. La mayoría de los pescadores considera que la calidad del agua es regular y que la laguna mantiene la economía de sus familias y de las comunidades de La Angostura y Los Tepetates. Estas percepciones ayudaron a obtener un análisis social de la calidad del agua en la laguna y pueden derivar en el reforzamiento y la creación de estrategias para el manejo y la conservación de este cuerpo de agua.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46108850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anabella Giusto, Natalia Florencia Aprigliano, Paula Caramellino, Pablo Sebastián Almada
La calidad del agua en los puertos puede verse afectada por contaminación proveniente desde tierra y/o desde el agua. Los cruceros son verdaderas ciudades flotantes, con capacidad para más de 5000 personas, generando gran cantidad de aguas sucias. Los buques poseen plantas de tratamiento reguladas internacionalmente, con distintos estándares de calidad de descarga. El objetivo del trabajo fue evaluar las características de los cruceros, de sus plantas de tratamiento y su posible impacto en la calidad del agua del Puerto Buenos Aires, Argentina. Se realizaron ocho muestreos entre octubre de 2018 y marzo de 2019 en las dársenas A, B y C del puerto y en el Río de la Plata (RDP), además se recopiló información de los cruceros amarrados al momento de los muestreos. Se censaron 21 cruceros, transportando más de 57 000 personas. La dársena B fue la que recibió mayor cantidad de cruceros (11) y personas a bordo (39 562). El 90.5 % de los cruceros cumplió con la normativa MEPC.2 (VI), el 9.5 % con la MEPC.159 (55) y ninguno con la MEPC.227 (64), la más restrictiva. Esto podría estar relacionado con que la flota que opera en esta zona de Sudamérica es más antigua que la que opera en zonas especiales con legislación más estricta. Se observaron diferencias significativas entre la calidad del agua portuaria y la del RDP. Sin embargo, no existe evidencia de un efecto directo por parte de los cruceros. Para futuras investigaciones se recomienda caracterizar los efluentes de las plantas de tratamiento y su posible efecto en el agua del puerto.
港口的水质可能受到陆地和/或水污染的影响。游轮是真正的漂浮城市，可容纳5000多人，产生大量的脏水。船舶拥有国际监管的处理厂，具有不同的排放质量标准。这项研究的目的是评估游轮的特点，它们的处理厂及其对阿根廷布宜诺斯艾利斯港水质的可能影响。2018年10月至2019年3月期间，在港口的A、B和C码头和rio de la Plata (RDP)进行了8次抽样，并收集了抽样时停泊的游轮的信息。共有21艘游轮，载客量超过5.7万人次。B码头接待了最多的游轮(11艘)和船上人数(39562人)。90.5%的邮轮符合MEPC.2 (VI)标准，9.5%符合MEPC.159(55)标准，没有符合最严格的MEPC.227(64)标准。这可能与在南美洲这一地区运营的舰队比在立法更严格的特殊地区运营的舰队更古老有关。港口水质与RDP水质有显著差异。然而，没有证据表明邮轮有直接影响。在未来的研究中，建议描述处理厂的废水及其对港口水的可能影响。
{"title":"Estudio del posible impacto de los cruceros turísticos en la calidad del agua del Puerto Buenos Aires, Argentina","authors":"Anabella Giusto, Natalia Florencia Aprigliano, Paula Caramellino, Pablo Sebastián Almada","doi":"10.20937/rica.54732","DOIUrl":"https://doi.org/10.20937/rica.54732","url":null,"abstract":"La calidad del agua en los puertos puede verse afectada por contaminación proveniente desde tierra y/o desde el agua. Los cruceros son verdaderas ciudades flotantes, con capacidad para más de 5000 personas, generando gran cantidad de aguas sucias. Los buques poseen plantas de tratamiento reguladas internacionalmente, con distintos estándares de calidad de descarga. El objetivo del trabajo fue evaluar las características de los cruceros, de sus plantas de tratamiento y su posible impacto en la calidad del agua del Puerto Buenos Aires, Argentina. Se realizaron ocho muestreos entre octubre de 2018 y marzo de 2019 en las dársenas A, B y C del puerto y en el Río de la Plata (RDP), además se recopiló información de los cruceros amarrados al momento de los muestreos. Se censaron 21 cruceros, transportando más de 57 000 personas. La dársena B fue la que recibió mayor cantidad de cruceros (11) y personas a bordo (39 562). El 90.5 % de los cruceros cumplió con la normativa MEPC.2 (VI), el 9.5 % con la MEPC.159 (55) y ninguno con la MEPC.227 (64), la más restrictiva. Esto podría estar relacionado con que la flota que opera en esta zona de Sudamérica es más antigua que la que opera en zonas especiales con legislación más estricta. Se observaron diferencias significativas entre la calidad del agua portuaria y la del RDP. Sin embargo, no existe evidencia de un efecto directo por parte de los cruceros. Para futuras investigaciones se recomienda caracterizar los efluentes de las plantas de tratamiento y su posible efecto en el agua del puerto.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46425459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiangsheng Bao, Zengli Du, Sen Meng, Haiyan Zhou, Feiyan Ma, Chunmin Lin, Cungen Liu, Yecheng Li
Ninety-eight % of the world’s natural gas hydrate (commonly known as hydrate) are distributed in the stability zone of the sea areas. There are also rich hydrates in the stability zone of the Shenhu Sea Area in China. Drilling in the Shenhu Sea Area of China reveals that a lot of hydrate exist in suspension mode. Now the Wood method is for predicting hydrate in suspension mode, but the practical application in the Shenhu Sea Area shows that this method leads to large errors in predicting hydrate saturation. In order to address the problem of low accuracy of the Wood method in predicting hydrate saturation in suspension mode, this paper has first pointed out that the low accuracy of the Wood method is primarily caused by the systematic analytic error of stratigraphic parameters, which is derived from insufficient understanding of sediment composition and porosity in sea area by existing analytic technology. The paper puts forward the Wood-SE method alternatively. The practical application in the Shenhu Sea Area shows that the absolute error of this method mainly falls within the range of -10%, 10%. Most of the absolute error of the Wood method is above 20%. The error of main hydrate occurrence section could even reach 60%.
{"title":"Improved Prediction Method for Gas Hydrate Saturation in Sea Areas","authors":"Xiangsheng Bao, Zengli Du, Sen Meng, Haiyan Zhou, Feiyan Ma, Chunmin Lin, Cungen Liu, Yecheng Li","doi":"10.20937/rica.54601","DOIUrl":"https://doi.org/10.20937/rica.54601","url":null,"abstract":"Ninety-eight % of the world’s natural gas hydrate (commonly known as hydrate) are distributed in the stability zone of the sea areas. There are also rich hydrates in the stability zone of the Shenhu Sea Area in China. Drilling in the Shenhu Sea Area of China reveals that a lot of hydrate exist in suspension mode. Now the Wood method is for predicting hydrate in suspension mode, but the practical application in the Shenhu Sea Area shows that this method leads to large errors in predicting hydrate saturation. In order to address the problem of low accuracy of the Wood method in predicting hydrate saturation in suspension mode, this paper has first pointed out that the low accuracy of the Wood method is primarily caused by the systematic analytic error of stratigraphic parameters, which is derived from insufficient understanding of sediment composition and porosity in sea area by existing analytic technology. The paper puts forward the Wood-SE method alternatively. The practical application in the Shenhu Sea Area shows that the absolute error of this method mainly falls within the range of -10%, 10%. Most of the absolute error of the Wood method is above 20%. The error of main hydrate occurrence section could even reach 60%.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48112920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To study the optimal fermentation conditions of Prunus armeniaca L. (apricot), single factor experiments and orthogonal experiments were implemented. The experimental results demonstrate that the optimum alcoholic fermentation conditions are: sugar degree a 9%, inoculation quantity of yeast at 0.7%, fermentation temperature at 30 ºC. The alcohol degree could reach 7.56%; the optimum acetic fermentation conditions are: alcohol degree at 7%, inoculation quantity of acetic acid bacillus at 0.8%, fermentation temperature at 32 ºC, fermentation time at 7 days, and the total acid content could be obtained as 6.78 g/100 mL. Under such conditions, the fruit vinegar has rich Prunus armeniaca L. flavor and pure taste.
{"title":"Optimization of Fermentation Process for Apricot Vinegar","authors":"Ximin Cao, Aizhi Lv","doi":"10.20937/rica.54602","DOIUrl":"https://doi.org/10.20937/rica.54602","url":null,"abstract":"To study the optimal fermentation conditions of Prunus armeniaca L. (apricot), single factor experiments and orthogonal experiments were implemented. The experimental results demonstrate that the optimum alcoholic fermentation conditions are: sugar degree a 9%, inoculation quantity of yeast at 0.7%, fermentation temperature at 30 ºC. The alcohol degree could reach 7.56%; the optimum acetic fermentation conditions are: alcohol degree at 7%, inoculation quantity of acetic acid bacillus at 0.8%, fermentation temperature at 32 ºC, fermentation time at 7 days, and the total acid content could be obtained as 6.78 g/100 mL. Under such conditions, the fruit vinegar has rich Prunus armeniaca L. flavor and pure taste.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43447618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shafagh Molaei, M. Hamidpour, H. Shirani, M. Sabet
Intensive research efforts have been followed to remove arsenic (As) from contaminated water to provide potable water to millions living in different countries. Adsorption is a simple and efficient way for arsenic contamination purification in water, with a pressing challenge to find a cheap and efficient adsorbent. The present paper deals with optimizing various batch parameters for the adsorption of As from solution by synthesized iron-based particles (hematite, magnetite, and zero-valent iron (ZVI)) nanomaterials using Taguchi’s optimization methodology. Taguchi’s (L27) orthogonal design with six effective factors, namely: initial As concentration, pH, contact time, adsorbent type, size, and dose, was applied for the multivariate optimization in adsorption studies for As to maximize the adsorption capacity along with the signal-to-noise ratio. The equilibrium studies revealed that the data were well described by Freundlich isotherm. The results showed that initial As concentration was the most important parameter in the adsorption process.
{"title":"Investigation of factors affecting removal of arsenic from polluted water using iron-based particles: Taguchi optimization design","authors":"Shafagh Molaei, M. Hamidpour, H. Shirani, M. Sabet","doi":"10.20937/rica.54830","DOIUrl":"https://doi.org/10.20937/rica.54830","url":null,"abstract":"Intensive research efforts have been followed to remove arsenic (As) from contaminated water to provide potable water to millions living in different countries. Adsorption is a simple and efficient way for arsenic contamination purification in water, with a pressing challenge to find a cheap and efficient adsorbent. The present paper deals with optimizing various batch parameters for the adsorption of As from solution by synthesized iron-based particles (hematite, magnetite, and zero-valent iron (ZVI)) nanomaterials using Taguchi’s optimization methodology. Taguchi’s (L27) orthogonal design with six effective factors, namely: initial As concentration, pH, contact time, adsorbent type, size, and dose, was applied for the multivariate optimization in adsorption studies for As to maximize the adsorption capacity along with the signal-to-noise ratio. The equilibrium studies revealed that the data were well described by Freundlich isotherm. The results showed that initial As concentration was the most important parameter in the adsorption process.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67656923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PM10 and PM2.5 concentrations are regularly monitored because they cause adverse effects on human health. The concentrations of PM10 and PM2.5 vary within a city due to land use, the amount of traffic, and pollution sources. As the COVID-19 pandemic spread around the world, lockdowns were enacted to stop the spread of the virus. These lockdowns meant reduced mobility and the halt of certain economic activities which had an impact on air pollution sources. In this paper, we assess the effect of the lockdown enacted in April-May 2020 in the Mexico City Metropolitan Area on PM10 and PM2.5 concentrations, using statistical analysis tools. MODIS-derived aerosol optical depth is used to assess the change of aerosols spatial distribution during the lockdown. Furthermore, a Mann-Whitney test is applied to PM10 and PM2.5 data from ground-based monitoring stations to evaluate the effects of lockdown. A general reduction of 20 % of PM10 and 10 % in PM2.5 was found. Overall, a 15 % reduction in particulate matter was found in Mexico City due to lockdown.
{"title":"Assessment of COVID-19 lockdown impact on PM10 and PM2.5 concentrations in the Mexico City Metropolitan Area","authors":"J. Méndez-Astudillo","doi":"10.20937/rica.54659","DOIUrl":"https://doi.org/10.20937/rica.54659","url":null,"abstract":"PM10 and PM2.5 concentrations are regularly monitored because they cause adverse effects on human health. The concentrations of PM10 and PM2.5 vary within a city due to land use, the amount of traffic, and pollution sources. As the COVID-19 pandemic spread around the world, lockdowns were enacted to stop the spread of the virus. These lockdowns meant reduced mobility and the halt of certain economic activities which had an impact on air pollution sources. In this paper, we assess the effect of the lockdown enacted in April-May 2020 in the Mexico City Metropolitan Area on PM10 and PM2.5 concentrations, using statistical analysis tools. MODIS-derived aerosol optical depth is used to assess the change of aerosols spatial distribution during the lockdown. Furthermore, a Mann-Whitney test is applied to PM10 and PM2.5 data from ground-based monitoring stations to evaluate the effects of lockdown. A general reduction of 20 % of PM10 and 10 % in PM2.5 was found. Overall, a 15 % reduction in particulate matter was found in Mexico City due to lockdown.","PeriodicalId":49608,"journal":{"name":"Revista Internacional De Contaminacion Ambiental","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46912704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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