: Heavy metals are metallic elements with a relatively high density that are dangerous or hazardous at low concentrations and pose a serious threat to people and the environment. The purpose of this research is to ascertain the concentrations of heavy and trace metals in the Lagos State communities of Ojota and Oko Filling. The soil samples taken from the dumpsites were treated using the digestion process. After being placed into a sampling vial, the mixed solution from the digestion process was then taken for measurement using inductively coupled plasma optical emission spectroscopy (ICP-OES). Samples taken from the dumpsites at Ojota and Igando contained 12.52% and 4.44% of moisture, respectively. The analysis's findings showed that the average concentrations of Fe (42.429 mg/L), Zn (2.070 mg/L), Ca (7.140 mg/L), P (9.06 mg/L), Cd (0.022 mg/L), Cr (0.042 mg/L), Cu (0.135 mg/L), Pb (1.280 mg/L), and Ni (0.123 mg/L) at the Ojota dumpsite were all within the WHO/FAO standards' tolerable limits and did not pose any risk. While, Fe (94.784 mg/L), Zn (11.564 mg/L), Ca (45.243 mg/L), Cd (2.838 mg/L), Cr (0.046 mg/L), Cu (0.215 mg/L), and Ni (0.22 mg/L) are the mean concentrations, respectively. In conclusion, the results from the Oko – filling dumpsites shows that the heavy metals from the soil is highly toxic and are such harmful to the environment and detrimental to human life than Ojota dumpsites.
{"title":"Determination of Toxic and Trace Heavy Metals in the Soil of Two Different Dumpsites: A Case Study of Ojota and Oko Filling Dumpsites, Lagos State","authors":"Moronkola Bridget Adekeni, Alegbe Monday John, Okpala-Chunonso Angela, Adewusi Anuoluwapo","doi":"10.11648/j.sjc.20231102.12","DOIUrl":"https://doi.org/10.11648/j.sjc.20231102.12","url":null,"abstract":": Heavy metals are metallic elements with a relatively high density that are dangerous or hazardous at low concentrations and pose a serious threat to people and the environment. The purpose of this research is to ascertain the concentrations of heavy and trace metals in the Lagos State communities of Ojota and Oko Filling. The soil samples taken from the dumpsites were treated using the digestion process. After being placed into a sampling vial, the mixed solution from the digestion process was then taken for measurement using inductively coupled plasma optical emission spectroscopy (ICP-OES). Samples taken from the dumpsites at Ojota and Igando contained 12.52% and 4.44% of moisture, respectively. The analysis's findings showed that the average concentrations of Fe (42.429 mg/L), Zn (2.070 mg/L), Ca (7.140 mg/L), P (9.06 mg/L), Cd (0.022 mg/L), Cr (0.042 mg/L), Cu (0.135 mg/L), Pb (1.280 mg/L), and Ni (0.123 mg/L) at the Ojota dumpsite were all within the WHO/FAO standards' tolerable limits and did not pose any risk. While, Fe (94.784 mg/L), Zn (11.564 mg/L), Ca (45.243 mg/L), Cd (2.838 mg/L), Cr (0.046 mg/L), Cu (0.215 mg/L), and Ni (0.22 mg/L) are the mean concentrations, respectively. In conclusion, the results from the Oko – filling dumpsites shows that the heavy metals from the soil is highly toxic and are such harmful to the environment and detrimental to human life than Ojota dumpsites.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88110286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.11648/j.sjc.20231102.11
Amalachukwu Ifeyinwa Obi, Vincent Ismael Egbulefu Ajiwe, Ozioma Juliana Anekwe, Emeka Christian Ezeudu, Cecilia Nkemjika Aduaka
: The use of lignocellulosic materials for oil sorption from aqueous medium has directed attention to acetylation as a means of increasing the hydrophobicity of these materials. In this paper, acetylation of Cucumeropsis mannii seed shell, a readily available agricultural waste, was studied. Effects of different acetylation conditions on the extent of acetylation of the seed shell was investigated. The kinetics of the acetylation process was studied using pseudo first order, pseudo second order, and intraparticle diffusion models. The thermodynamics of the acetylation process was also studied. FTIR analysis provided evidence of successful acetylation of the seed shell. The extent of acetylation increased with increase in acetylation duration, temperature and catalyst concentration. Pseudo second order kinetics best described the acetylation process, with minimum extent of acetylation and rate constant values of 0.317 and -0.0148 min -1 , respectively. Thermodynamic studies revealed that the acetylation process was endothermic in nature. The critical extent of acetylation, heat capacity at constant pressure, and change in entropy values were 1.002, 0.162 kJ.mol -1 .K -1 , and 0.020 kJ.mol -1 .K -1 , respectively. The acetylation process was spontaneous at temperatures of 328 K ‒ 348 K, but non-spontaneous at lower temperatures (308 K and 318 K). The critical temperature of acetylation was 419 K, which shows that acetylation of CMSS can easily take place at mild conditions.
木质纤维素材料从水介质中吸油的使用引起了人们对乙酰化的关注，乙酰化是增加这些材料疏水性的一种手段。本文研究了农用废弃物甘尼黄瓜种子壳的乙酰化。研究了不同乙酰化条件对种子壳乙酰化程度的影响。采用拟一阶、拟二阶和颗粒内扩散模型研究了乙酰化过程的动力学。对乙酰化过程进行了热力学研究。FTIR分析提供了成功乙酰化的证据。乙酰化程度随乙酰化时间、温度和催化剂浓度的增加而增加。准二级动力学最能描述乙酰化过程，乙酰化程度最小，速率常数值分别为0.317和-0.0148 min -1。热力学研究表明乙酰化过程本质上是吸热的。乙酰化临界程度、恒压热容和熵值变化分别为1.002、0.162 kJ。mol -1 . k -1和0.020 kJ。mol -1 . k -1。在328 K ~ 348 K的温度下，乙酰化过程是自发的，而在308 K和318 K的温度下，乙酰化的临界温度为419 K，这表明CMSS在温和的条件下很容易发生乙酰化。
{"title":"Kinetics and Thermodynamic Study of the Acetylation of <i>Cucumeropsis mannii </i>Seed Shell","authors":"Amalachukwu Ifeyinwa Obi, Vincent Ismael Egbulefu Ajiwe, Ozioma Juliana Anekwe, Emeka Christian Ezeudu, Cecilia Nkemjika Aduaka","doi":"10.11648/j.sjc.20231102.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20231102.11","url":null,"abstract":": The use of lignocellulosic materials for oil sorption from aqueous medium has directed attention to acetylation as a means of increasing the hydrophobicity of these materials. In this paper, acetylation of Cucumeropsis mannii seed shell, a readily available agricultural waste, was studied. Effects of different acetylation conditions on the extent of acetylation of the seed shell was investigated. The kinetics of the acetylation process was studied using pseudo first order, pseudo second order, and intraparticle diffusion models. The thermodynamics of the acetylation process was also studied. FTIR analysis provided evidence of successful acetylation of the seed shell. The extent of acetylation increased with increase in acetylation duration, temperature and catalyst concentration. Pseudo second order kinetics best described the acetylation process, with minimum extent of acetylation and rate constant values of 0.317 and -0.0148 min -1 , respectively. Thermodynamic studies revealed that the acetylation process was endothermic in nature. The critical extent of acetylation, heat capacity at constant pressure, and change in entropy values were 1.002, 0.162 kJ.mol -1 .K -1 , and 0.020 kJ.mol -1 .K -1 , respectively. The acetylation process was spontaneous at temperatures of 328 K ‒ 348 K, but non-spontaneous at lower temperatures (308 K and 318 K). The critical temperature of acetylation was 419 K, which shows that acetylation of CMSS can easily take place at mild conditions.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78815600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of the Chemical Composition of <i>L. schlechteri</i> with Other Selected Green Leafy Vegetables","authors":"Arnaud Wenceslas Geoffroy Tamba Sompila, Nadia Pamela Gladys Pambou-Tobi, Roniche Nguie, Michel Elenga","doi":"10.11648/j.sjc.20231101.14","DOIUrl":"https://doi.org/10.11648/j.sjc.20231101.14","url":null,"abstract":"","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83898225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.11648/j.sjc.20231101.15
Mamadou Guy-Richard Koné, Adama Niaré, B. Ouattara, Georges Stéphane Dembélé, P. Karamanis, N. Ziao
{"title":"Chemical Stability of Imidazole-Thiosemicarbazides in Solvents: NBO Studies and Theoretical Absorption Spectrum","authors":"Mamadou Guy-Richard Koné, Adama Niaré, B. Ouattara, Georges Stéphane Dembélé, P. Karamanis, N. Ziao","doi":"10.11648/j.sjc.20231101.15","DOIUrl":"https://doi.org/10.11648/j.sjc.20231101.15","url":null,"abstract":"","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85129892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.11648/j.sjc.20231101.13
Ndiouga Fall, B. Traoré, Mbossé Ndiaye-Guèye, O. Diouf, Ibrahima Elhadji Thiam, Simon C. Coles, J. Orton, M. Gaye
{"title":"Synthesis, Spectroscopic Characterization, and X-ray Structure of the Co-crystal Copper(II) Complex of the Dissymmetrical 1-(2 hydroxy-3-methoxybenzylidene)-5-(pyridin-2 ylmethylene) Carbnohydrazide Ligand","authors":"Ndiouga Fall, B. Traoré, Mbossé Ndiaye-Guèye, O. Diouf, Ibrahima Elhadji Thiam, Simon C. Coles, J. Orton, M. Gaye","doi":"10.11648/j.sjc.20231101.13","DOIUrl":"https://doi.org/10.11648/j.sjc.20231101.13","url":null,"abstract":"","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76583217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.11648/j.sjc.20231101.12
Fandia Konate, Kadjo François Kassi, Georges Stéphane Dembélé, Chiepi Nadege Dominique Dou, B. Konaté, Doh Soro, Guy-Richard Mamadou Kone, N. Ziao
Study of the Chemical Reactivity of a Series of Dihydrothiophenone Derivatives by the Density Functional Theory
用密度泛函理论研究一系列二氢噻吩酮衍生物的化学反应性
{"title":"Study of the Chemical Reactivity of a Series of Dihydrothiophenone Derivatives by the Density Functional Theory (DFT) Method","authors":"Fandia Konate, Kadjo François Kassi, Georges Stéphane Dembélé, Chiepi Nadege Dominique Dou, B. Konaté, Doh Soro, Guy-Richard Mamadou Kone, N. Ziao","doi":"10.11648/j.sjc.20231101.12","DOIUrl":"https://doi.org/10.11648/j.sjc.20231101.12","url":null,"abstract":"Study of the Chemical Reactivity of a Series of Dihydrothiophenone Derivatives by the Density Functional Theory","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"176 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77933829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-30DOI: 10.11648/j.sjc.20231101.11
Alassane Youssao Abdou Karim, E. Azokpota, Léonce Firmin Dovonon, Abdoul Kader Alassane Moussa, Alphonse Sako Avocefohoun, D. Mama, Dominique Codjo Koko Sohounhloue
{"title":"Assessment of Heavy Metals (As, Cd, Hg, Pb) in Sources of Water for Human Consumption in Sub-Saharan Africa: A Literature Review","authors":"Alassane Youssao Abdou Karim, E. Azokpota, Léonce Firmin Dovonon, Abdoul Kader Alassane Moussa, Alphonse Sako Avocefohoun, D. Mama, Dominique Codjo Koko Sohounhloue","doi":"10.11648/j.sjc.20231101.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20231101.11","url":null,"abstract":"","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81238130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-01DOI: 10.11648/j.sjc.20221002.12
D. Mulugeta
: Chalcones are the primary building blocks for flavonoids and isoflavonoids production. Chalcones are a three-carbon, -unsaturated carbonyl system. Chalcones form when an aromatic aldehyde reacts with acetophenones in the presence of a catalyst. For the synthesis of these molecules, a variety of methods and approaches have been reported. The Aldol condensation and Claisen-Schmidt condensation reactions are the most commonly referenced synthetic protocols in the literature, but the Suzuki reaction, Witting reaction, and Photo-Fries rearrangement have also been employed as synthetic procedures within the chalcone framework. SOCl 2 natural phosphate, lithium nitrate, amino grafted zeolites, zinc oxide, water, K 2 CO 3 , PEG400, silica sulfuric acid, ZrCl 4 , and ionic liquid are among the most commonly used catalysts in the synthesis of the chalcone framework.
{"title":"A Review of Synthesis Methods of Chalcones, Flavonoids, and Coumarins","authors":"D. Mulugeta","doi":"10.11648/j.sjc.20221002.12","DOIUrl":"https://doi.org/10.11648/j.sjc.20221002.12","url":null,"abstract":": Chalcones are the primary building blocks for flavonoids and isoflavonoids production. Chalcones are a three-carbon, -unsaturated carbonyl system. Chalcones form when an aromatic aldehyde reacts with acetophenones in the presence of a catalyst. For the synthesis of these molecules, a variety of methods and approaches have been reported. The Aldol condensation and Claisen-Schmidt condensation reactions are the most commonly referenced synthetic protocols in the literature, but the Suzuki reaction, Witting reaction, and Photo-Fries rearrangement have also been employed as synthetic procedures within the chalcone framework. SOCl 2 natural phosphate, lithium nitrate, amino grafted zeolites, zinc oxide, water, K 2 CO 3 , PEG400, silica sulfuric acid, ZrCl 4 , and ionic liquid are among the most commonly used catalysts in the synthesis of the chalcone framework.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84229602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.11648/j.sjc.20221002.11
M. Darvish, A. Ajji
: The integration of essential oils (EOs) into polymers to endow antimicrobial properties has received a lot of attention. EOs are remarkable in that they have broad antimicrobial activity from a natural source while also being volatile. Their volatility, on the other hand, makes high-temperature processing techniques difficult to incorporate into polymers. In this study, active films based on low-density polyethylene (LDPE) and limonene essential oil (LEO) were prepared and characterized. Before incorporation of LEO into LDPE, vacuum pulling method was used to load the LEO into five different mineral carriers. All Carrier-LEO complexes were added into LDPE using melt compounding. The goal is to analyze the potential use of these formulations to achieve prolonged antimicrobial film packaging. The halloysite nanotubes (HNTs), kaolinite (Kao), mesoporous silica nanoparticles (MSNs), zinc oxide nanoparticles (ZnONPs)
{"title":"Synergistic Antimicrobial Activities of Limonene with Mineral Carriers in LDPE Films for Active Packaging Application","authors":"M. Darvish, A. Ajji","doi":"10.11648/j.sjc.20221002.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20221002.11","url":null,"abstract":": The integration of essential oils (EOs) into polymers to endow antimicrobial properties has received a lot of attention. EOs are remarkable in that they have broad antimicrobial activity from a natural source while also being volatile. Their volatility, on the other hand, makes high-temperature processing techniques difficult to incorporate into polymers. In this study, active films based on low-density polyethylene (LDPE) and limonene essential oil (LEO) were prepared and characterized. Before incorporation of LEO into LDPE, vacuum pulling method was used to load the LEO into five different mineral carriers. All Carrier-LEO complexes were added into LDPE using melt compounding. The goal is to analyze the potential use of these formulations to achieve prolonged antimicrobial film packaging. The halloysite nanotubes (HNTs), kaolinite (Kao), mesoporous silica nanoparticles (MSNs), zinc oxide nanoparticles (ZnONPs)","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73124143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.11648/j.sjc.20221003.11
Xiongshuang Su, Cheng Chen, Jia Li, Shunxing Lu, Guihua Xu
: Microplastics have been ubiquitously in the environment, and a large number of microplastics have entered wastewater treatment plants, and their effects on activated sludge denitrification are rarely reported. Polypropylene (PP) microplastics were selected as the research object for denitrification research. Herein, we set different concentrations of PP microplastics to study their effect on sewage denitrification. Several indicators including NO 3- -N, NO 2- -N, Total-N (TN), extracellular polymer substances, Zeta potential, and N 2 O production, etc., were employed to evaluate the denitrification effect. Results demonstrated that the denitrification process was affected by the concentration of PP microplastics. Its concentration may damage the denitrification of sludge, especially in low concentrations, due to its slowing down the NO 2- -N reduction process. Meanwhile, it will release an amount of greenhouse gas N 2 O as the concentration is positively correlated. However, the removal of NO 3- -N is almost unaffected in different concentrations of PP microplastics during the denitrification process. When the concentration of PP microplastics reached 60 mg L -1 , the accumulation of NO 2- -N in the effluent increased significantly. Accordingly, the extracellular polymer and potential indicators also showed that PP microplastics will reduce the flocculation capacity of the sludge, resulting in a decrease in the denitrification efficiency of the sludge overall. When the concentration of PP microplastics exceeded 100 mg L -1 , the impact of microplastics on denitrification water quality indicators was relatively small, but it will increase the N 2 O emission with a negative impact. In addition, the activated sludge denitrification pathway can be affected by the addition of different microplastics and requires further investigations in the future.
微塑料在环境中无处不在，大量微塑料进入污水处理厂，其对活性污泥反硝化的影响鲜有报道。以聚丙烯(PP)微塑料为研究对象，进行了脱氮研究。本研究设置不同浓度的PP微塑料，研究其对污水脱氮的影响。采用no3 -N、no2 -N、Total-N (TN)、胞外高分子物质、Zeta电位、n2o产量等指标评价反硝化效果。结果表明，聚丙烯微塑料的浓度对脱氮过程有影响。它的浓度可能会破坏污泥的反硝化作用，特别是在低浓度下，因为它减缓了NO 2- - n的还原过程。同时，由于浓度呈正相关，也会释放一定量的温室气体n2o。然而，在不同浓度的PP微塑料脱氮过程中，no3 - - n的去除率几乎不受影响。当PP微塑料浓度达到60 mg L -1时，出水no2 - n的积累量显著增加。因此，胞外聚合物和电位指标也表明，PP微塑料会降低污泥的絮凝能力，导致污泥的整体反硝化效率下降。当PP微塑料浓度超过100 mg L -1时，微塑料对反硝化水质指标的影响相对较小，但会增加n2o排放量，产生负面影响。此外，添加不同微塑料对活性污泥反硝化途径的影响有待于进一步研究。
{"title":"Effect of Polypropylene Microplastics Concentration on Wastewater Denitrification","authors":"Xiongshuang Su, Cheng Chen, Jia Li, Shunxing Lu, Guihua Xu","doi":"10.11648/j.sjc.20221003.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20221003.11","url":null,"abstract":": Microplastics have been ubiquitously in the environment, and a large number of microplastics have entered wastewater treatment plants, and their effects on activated sludge denitrification are rarely reported. Polypropylene (PP) microplastics were selected as the research object for denitrification research. Herein, we set different concentrations of PP microplastics to study their effect on sewage denitrification. Several indicators including NO 3- -N, NO 2- -N, Total-N (TN), extracellular polymer substances, Zeta potential, and N 2 O production, etc., were employed to evaluate the denitrification effect. Results demonstrated that the denitrification process was affected by the concentration of PP microplastics. Its concentration may damage the denitrification of sludge, especially in low concentrations, due to its slowing down the NO 2- -N reduction process. Meanwhile, it will release an amount of greenhouse gas N 2 O as the concentration is positively correlated. However, the removal of NO 3- -N is almost unaffected in different concentrations of PP microplastics during the denitrification process. When the concentration of PP microplastics reached 60 mg L -1 , the accumulation of NO 2- -N in the effluent increased significantly. Accordingly, the extracellular polymer and potential indicators also showed that PP microplastics will reduce the flocculation capacity of the sludge, resulting in a decrease in the denitrification efficiency of the sludge overall. When the concentration of PP microplastics exceeded 100 mg L -1 , the impact of microplastics on denitrification water quality indicators was relatively small, but it will increase the N 2 O emission with a negative impact. In addition, the activated sludge denitrification pathway can be affected by the addition of different microplastics and requires further investigations in the future.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90789684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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