Salma Morad, Siba Abo Ali, Layan Diab, Rehan Abedelrahman, Faihaa Amar, Sare Asli, Muhamad Hugerat, Inas Said, Mahmud Diab
Abstract Water pollution is a global concern, necessitating accessible and effective water treatment solutions. Our study focused on developing and evaluating carbonized cotton filters for methylene blue (MB) removal from drinking water. We examined the impact of carbonization parameters on filter performance, revealing significantly higher MB removal with carbonized filters compared to pure cotton. This improvement can be attributed to increased surface area, enhanced adsorption capacity, and altered chemical properties resulting from carbonization. We also tested the generality of the process using lentils and sesame, further demonstrating the versatility of carbonized cotton filters. Additionally, we assessed filter durability through multiple filtration cycles, confirming their consistent efficiency over time. Our findings underscore carbonized cotton filters’ efficacy and broad applicability for water purification, providing an affordable and sustainable solution to combat water pollution. This research advances water treatment technologies and advocates for using locally available resources to enhance water quality cost-effectively and eco-friendly.
{"title":"Carbon filtration: harnessing cotton's power to purify drinking water","authors":"Salma Morad, Siba Abo Ali, Layan Diab, Rehan Abedelrahman, Faihaa Amar, Sare Asli, Muhamad Hugerat, Inas Said, Mahmud Diab","doi":"10.2166/wqrj.2023.013","DOIUrl":"https://doi.org/10.2166/wqrj.2023.013","url":null,"abstract":"Abstract Water pollution is a global concern, necessitating accessible and effective water treatment solutions. Our study focused on developing and evaluating carbonized cotton filters for methylene blue (MB) removal from drinking water. We examined the impact of carbonization parameters on filter performance, revealing significantly higher MB removal with carbonized filters compared to pure cotton. This improvement can be attributed to increased surface area, enhanced adsorption capacity, and altered chemical properties resulting from carbonization. We also tested the generality of the process using lentils and sesame, further demonstrating the versatility of carbonized cotton filters. Additionally, we assessed filter durability through multiple filtration cycles, confirming their consistent efficiency over time. Our findings underscore carbonized cotton filters’ efficacy and broad applicability for water purification, providing an affordable and sustainable solution to combat water pollution. This research advances water treatment technologies and advocates for using locally available resources to enhance water quality cost-effectively and eco-friendly.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136112212","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}
Shaun Lancaster, Warren T. Corns, Eva M. Krupp, Jörg Feldmann
Abstract Anthropogenic emissions of mercury to the environment are of great concern due to its toxicity. The burning of coal contributes highly to Hg emissions and, as such, much lower effluent discharge limits for Hg in flue gas desulphurisation (FGD) wastewater have recently been proposed in the USA. Lower detection limits are required to meet the most demanding discharge limit of 10 ng L−1. Therefore, in this work, a new analyser for online monitoring of Hg in FGD wastewater based on syringe injections of chemicals combined with gold amalgamation – atomic fluorescence spectrometry has been developed. The instrument has been validated against international standard method ISO 17852, as well as an interference study with extreme levels of salts majorly present in FGD water. Detection limits of 1.8 ng L−1 as well as accurate performance in an on-site field trial indicate that the methodology is fit to meet the new legislation.
由于汞的毒性，人类向环境排放汞引起了人们的极大关注。煤的燃烧对汞的排放有很大贡献，因此，最近在美国提出了更低的烟气脱硫(FGD)废水中汞的排放限值。为满足最严格的放电限值10ng L−1，需要降低检测限。为此，本文研制了一种基于化学药剂注射结合金汞齐原子荧光光谱法在线监测烟气脱硫废水中汞的新方法。该仪器已根据国际标准方法ISO 17852进行了验证，并对FGD水中主要存在的极端盐含量进行了干扰研究。1.8 ng L−1的检出限以及在现场现场试验中的准确性能表明，该方法适合满足新的立法。
{"title":"Development of an online analyser to meet challenging new discharge limits for mercury in flue gas desulphurisation wastewater","authors":"Shaun Lancaster, Warren T. Corns, Eva M. Krupp, Jörg Feldmann","doi":"10.2166/wqrj.2023.012","DOIUrl":"https://doi.org/10.2166/wqrj.2023.012","url":null,"abstract":"Abstract Anthropogenic emissions of mercury to the environment are of great concern due to its toxicity. The burning of coal contributes highly to Hg emissions and, as such, much lower effluent discharge limits for Hg in flue gas desulphurisation (FGD) wastewater have recently been proposed in the USA. Lower detection limits are required to meet the most demanding discharge limit of 10 ng L−1. Therefore, in this work, a new analyser for online monitoring of Hg in FGD wastewater based on syringe injections of chemicals combined with gold amalgamation – atomic fluorescence spectrometry has been developed. The instrument has been validated against international standard method ISO 17852, as well as an interference study with extreme levels of salts majorly present in FGD water. Detection limits of 1.8 ng L−1 as well as accurate performance in an on-site field trial indicate that the methodology is fit to meet the new legislation.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136211424","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}
Sahashransu Satyajeet Mahapatra, Amoor S. Vishwanathan
Abstract Monitoring the characteristics of wastewater can enable a better choice of the options available for its treatment and also provide a rational basis for the surveillance of the spread of waterborne diseases. Our work focused on bringing down the costs associated with the estimation of the biological and physico-chemical parameters of wastewater at a common wavelength of 600 nm. We demonstrated the advantages of using the Dye Reduction-based Electron-transfer Activity Monitoring (DREAM) assay to estimate bacterial activity as an alternative to the bacterial colony count method. This assay relies on the colorimetric measurement of the extent of reduction of methylene blue in response to bacterial electron transfer. We also present the results of estimating COD and turbidity, using the standard methods of wastewater analysis, at the same wavelength of 600 nm using samples having known values of chemical oxygen demand (COD) and turbidity. Our results open up the possibility of replacing expensive spectrophotometers with LED-based, microcontroller enabled colorimeters that can be easily automated. The results of our study set the stage for the establishment of a greater number of wastewater analysis laboratories in economically backward regions which can in turn support measures to improve sanitation facilities.
{"title":"Single-wavelength colorimetric tests for low-cost estimation of bacterial activity, chemical oxygen demand, and turbidity in domestic wastewater","authors":"Sahashransu Satyajeet Mahapatra, Amoor S. Vishwanathan","doi":"10.2166/wqrj.2023.110","DOIUrl":"https://doi.org/10.2166/wqrj.2023.110","url":null,"abstract":"Abstract Monitoring the characteristics of wastewater can enable a better choice of the options available for its treatment and also provide a rational basis for the surveillance of the spread of waterborne diseases. Our work focused on bringing down the costs associated with the estimation of the biological and physico-chemical parameters of wastewater at a common wavelength of 600 nm. We demonstrated the advantages of using the Dye Reduction-based Electron-transfer Activity Monitoring (DREAM) assay to estimate bacterial activity as an alternative to the bacterial colony count method. This assay relies on the colorimetric measurement of the extent of reduction of methylene blue in response to bacterial electron transfer. We also present the results of estimating COD and turbidity, using the standard methods of wastewater analysis, at the same wavelength of 600 nm using samples having known values of chemical oxygen demand (COD) and turbidity. Our results open up the possibility of replacing expensive spectrophotometers with LED-based, microcontroller enabled colorimeters that can be easily automated. The results of our study set the stage for the establishment of a greater number of wastewater analysis laboratories in economically backward regions which can in turn support measures to improve sanitation facilities.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093617","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}
J. G. T. Queluz, F. F. S. Pereira, R. M. Sánchez-Román
The purpose of this work was to estimate the crop evapotranspiration (ETc) and to determine the crop coefficient (Kc) of Typha latifolia in constructed wetlands. The experiment used two horizontal subsurface flow constructed wetlands (HFCWs) cultivated with T. latifolia . Each HFCW received 50 L of secondary effluent daily, resulting in 3.2 days of nominal hydraulic retention time (disregarding effects of evapotranspiration and precipitation). In order to determine the ETc, water mass balance of the HFCWs was performed. In this analysis, ETc was considered equal to the difference between the inflow (secondary effluent + precipitation) and the outflow. The Kc was calculated using ETc and reference evapotranspiration (ETo) data (Kc = ETc/ETo). The results showed that 7-day average ETc varied dramatically within the range of 4.9–20.0 mm day −1 , with an monthly average of 9.85 mm day −1 . The mean monthly values of Kc varied from 2.03 to 3.68 (mean: 2.74). ETc is very important with respect to the HFCW water balance because it decreases effluent outflow considerably. Therefore, the findings of this work indicate that water losses caused by evapotranspiration should be considered when designing constructed wetlands.
本工作的目的是估算人工湿地中宽叶香蒲的作物蒸散量（ETc）和作物系数（Kc）。实验采用宽叶T.latifolia栽培的两个水平潜流人工湿地（HFCW）。每个HFCW每天接收50升二次出水，导致3.2天的标称水力停留时间（不考虑蒸发和降水的影响）。为了测定ETc，进行了HFCW的水质量平衡。在该分析中，ETc被认为等于流入（二次出水+沉淀）和流出之间的差。使用ETc和参考蒸散量（ETo）数据（Kc=ETc/ETo）计算Kc。结果显示，7天平均ETc在4.9–20.0 mm day−1的范围内变化显著，月平均为9.85 mm day−1。Kc的月平均值在2.03至3.68之间（平均值：2.74）。ETc对HFCW水平衡非常重要，因为它大大减少了出水量。因此，这项工作的结果表明，在设计人工湿地时，应考虑蒸散引起的水分损失。
{"title":"Evapotranspiration and crop coefficient for Typha latifolia in constructed wetlands","authors":"J. G. T. Queluz, F. F. S. Pereira, R. M. Sánchez-Román","doi":"10.2166/WQRJ.2018.041","DOIUrl":"https://doi.org/10.2166/WQRJ.2018.041","url":null,"abstract":"The purpose of this work was to estimate the crop evapotranspiration (ETc) and to determine the crop coefficient (Kc) of Typha latifolia in constructed wetlands. The experiment used two horizontal subsurface flow constructed wetlands (HFCWs) cultivated with T. latifolia . Each HFCW received 50 L of secondary effluent daily, resulting in 3.2 days of nominal hydraulic retention time (disregarding effects of evapotranspiration and precipitation). In order to determine the ETc, water mass balance of the HFCWs was performed. In this analysis, ETc was considered equal to the difference between the inflow (secondary effluent + precipitation) and the outflow. The Kc was calculated using ETc and reference evapotranspiration (ETo) data (Kc = ETc/ETo). The results showed that 7-day average ETc varied dramatically within the range of 4.9–20.0 mm day −1 , with an monthly average of 9.85 mm day −1 . The mean monthly values of Kc varied from 2.03 to 3.68 (mean: 2.74). ETc is very important with respect to the HFCW water balance because it decreases effluent outflow considerably. Therefore, the findings of this work indicate that water losses caused by evapotranspiration should be considered when designing constructed wetlands.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/WQRJ.2018.041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43431943","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}
When Ron Droste, my colleague Editor-in-Chief, announced last year he felt it was time for him to step down and give a chance to somebody else to team up with me as Editor-in-Chief, a little panic attack followed. How do you replace a devoted, experienced and meticulous person as Ron? Well, we found a person that comes with an extraordinary skill set: Dr Arash Zamyadi, recently appointed assistant professor at Polytechnique Montreal. He is young and eager and has shown his devotion to the International Water Association in many ways, as recognized with the IWA Fellowship he obtained in 2016. For instance, in 2010 he initiated the North American chapter of IWA's Young Water Professionals. People that know him, can certainly vouch for his optimism, his incredible energy and high emotional intelligence quotient. However, in order to take up the challenging task of being Editor-in-Chief of a peer-reviewed journal that seeks to increase its impact, an excellent scientific reputation is key and the wide scope …
{"title":"Editorial: New Energy for Water Quality Research!","authors":"P. Vanrolleghem","doi":"10.2166/wqrj.2018.001","DOIUrl":"https://doi.org/10.2166/wqrj.2018.001","url":null,"abstract":"When Ron Droste, my colleague Editor-in-Chief, announced last year he felt it was time for him to step down and give a chance to somebody else to team up with me as Editor-in-Chief, a little panic attack followed. How do you replace a devoted, experienced and meticulous person as Ron?\u0000\u0000Well, we found a person that comes with an extraordinary skill set: Dr Arash Zamyadi, recently appointed assistant professor at Polytechnique Montreal. He is young and eager and has shown his devotion to the International Water Association in many ways, as recognized with the IWA Fellowship he obtained in 2016. For instance, in 2010 he initiated the North American chapter of IWA's Young Water Professionals. People that know him, can certainly vouch for his optimism, his incredible energy and high emotional intelligence quotient.\u0000\u0000However, in order to take up the challenging task of being Editor-in-Chief of a peer-reviewed journal that seeks to increase its impact, an excellent scientific reputation is key and the wide scope …","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/wqrj.2018.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47103919","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}
Bahman Banihashemi, R. Delatolla, S. Springthorpe, E. Gorman, A. Campbell, O. Basu, I. Douglas
This study investigates the effects of phosphorous supplementation on the formation potential of total trihalomethanes (TTHM fp ) and five species of haloacetic acids (HAA5 fp ) during exposure to clearwell disinfection contact times. In addition, the study investigates the effects of phosphorous supplementation on the dissolved oxygen, organic carbon and nitrogen removal along with biofilm coverage of the filter media and biomass viability of the attached biofilm. The uptake of total phosphorus in the P enhanced filter did not correspond to the consumption of readily assimilated nitrogen or the consumption of soluble carbon. As such, the dissolved organic carbon reduction in the biologically active filters was shown to not be phosphorous nutrient limited. The clearwell TTHM fp was shown to be reduced in all filters across all measured biological filtration times in the control and P enhanced filters. The HAA5 fp increased with phosphorus-supplemented operation at specific filtration cycle times as compared to non-phosphorus-supplemented operation, indicating the potential for production of HAA5 with phosphorous supplementation. Enhanced biofilm coverage of the anthracite and sand media was observed during phosphorous supplementation. In addition, increased viability of the cells embedded in the biofilm was observed in the sand media at depth during phosphorus-supplemented operation.
{"title":"Biofiltration optimization: Phosphorus supplementation effects on disinfection byproduct formation potential","authors":"Bahman Banihashemi, R. Delatolla, S. Springthorpe, E. Gorman, A. Campbell, O. Basu, I. Douglas","doi":"10.2166/WQRJ.2017.012","DOIUrl":"https://doi.org/10.2166/WQRJ.2017.012","url":null,"abstract":"This study investigates the effects of phosphorous supplementation on the formation potential of total trihalomethanes (TTHM fp ) and five species of haloacetic acids (HAA5 fp ) during exposure to clearwell disinfection contact times. In addition, the study investigates the effects of phosphorous supplementation on the dissolved oxygen, organic carbon and nitrogen removal along with biofilm coverage of the filter media and biomass viability of the attached biofilm. The uptake of total phosphorus in the P enhanced filter did not correspond to the consumption of readily assimilated nitrogen or the consumption of soluble carbon. As such, the dissolved organic carbon reduction in the biologically active filters was shown to not be phosphorous nutrient limited. The clearwell TTHM fp was shown to be reduced in all filters across all measured biological filtration times in the control and P enhanced filters. The HAA5 fp increased with phosphorus-supplemented operation at specific filtration cycle times as compared to non-phosphorus-supplemented operation, indicating the potential for production of HAA5 with phosphorous supplementation. Enhanced biofilm coverage of the anthracite and sand media was observed during phosphorous supplementation. In addition, increased viability of the cells embedded in the biofilm was observed in the sand media at depth during phosphorus-supplemented operation.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2017-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/WQRJ.2017.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43499363","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}
W. I. Nawawi, M. Azami, L. Ang, M. Ishak, K. Ismail
A commercially available TiO 2 (P25) was modified to produce nitrogen (N) doped TiO 2 prepared by mixing TiO 2 powder with various amounts of urea as N precursor using a microwave irradiation heating technique. X-ray photoelectron spectroscopy analysis showed that N chemically bonded with TiO 2 produces Ti-N. The measured band gap energy ( E g ) of the modified sample was ca . 2.9 eV as detected by UV-Vis/DRS. The optimum modified N doped TiO 2 denoted as U3-800 prepared at 230 °C showed an active visible light photoactivity. This observation shows that microwave irradiation is able to form Ti-N at low temperature whereas this previously could not be achieved under conventional heating using a muffle furnace at the same temperature. U3-800 showed visible light active photodegradation for 30, 10 and 5 mg L −1 of reactive red 4, crystal violet and Janus green dyes, respectively, in less than 105 min to complete decolorization under suspension mode while no photocatalytic activity was observed under pristine TiO 2 under the same conditions. Immobilization of a U3-800 sample was carried out using DSAT as a thin layer binder and the photoactivity of Immobilize/U3-800/DSAT is comparable with the suspension mode. Surprisingly, immobilized/U3-800 has a strong coating with glass support material and can be continuously used for 30 cycles without affecting photoactivity performance.
{"title":"Modification and characterization of microwave assisted N doped TiO2 – a photodegradation study under suspension and immobilized system","authors":"W. I. Nawawi, M. Azami, L. Ang, M. Ishak, K. Ismail","doi":"10.2166/WQRJC.2017.001","DOIUrl":"https://doi.org/10.2166/WQRJC.2017.001","url":null,"abstract":"A commercially available TiO 2 (P25) was modified to produce nitrogen (N) doped TiO 2 prepared by mixing TiO 2 powder with various amounts of urea as N precursor using a microwave irradiation heating technique. X-ray photoelectron spectroscopy analysis showed that N chemically bonded with TiO 2 produces Ti-N. The measured band gap energy ( E g ) of the modified sample was ca . 2.9 eV as detected by UV-Vis/DRS. The optimum modified N doped TiO 2 denoted as U3-800 prepared at 230 °C showed an active visible light photoactivity. This observation shows that microwave irradiation is able to form Ti-N at low temperature whereas this previously could not be achieved under conventional heating using a muffle furnace at the same temperature. U3-800 showed visible light active photodegradation for 30, 10 and 5 mg L −1 of reactive red 4, crystal violet and Janus green dyes, respectively, in less than 105 min to complete decolorization under suspension mode while no photocatalytic activity was observed under pristine TiO 2 under the same conditions. Immobilization of a U3-800 sample was carried out using DSAT as a thin layer binder and the photoactivity of Immobilize/U3-800/DSAT is comparable with the suspension mode. Surprisingly, immobilized/U3-800 has a strong coating with glass support material and can be continuously used for 30 cycles without affecting photoactivity performance.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2017-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/WQRJC.2017.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41584099","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}
Mayur Milan Kale, Kripal Singh, Dibyendu Debnath, Dennis A. Connor
Cellular adenosine triphosphate (cATP ™ ) may be used to characterize the biological degradation activity within the anaerobic and aerobic wastewater treatment systems. The feasibility of using cATP ™ as a process monitoring parameter for an anaerobic membrane bioreactor was evaluated. Results obtained from batch respirometric anaerobic treatability studies and a continuous sludge-bed anaerobic membrane bioreactor (SB-AnMBR) treating prehydrolysis liquor were examined. Both studies were conducted at an operating temperature of 35 °C. The batch studies indicated that the indirect activity measurements, such as the methane production rate correlated well with cATP ™ . The cATP ™ content of the SB-AnMBR responded to changes in total amount of degraded chemical oxygen demand (COD) and methane produced with correlation coefficient of 0.91 and 0.80, respectively. In contrast, cATP ™ was not well correlated to mixed liquor volatile suspended solids with correlation coefficient of 0.52. The values of cATP ™ /COD removed ratio and active biomass ratio (ABR ™ ) indicated that the increase in cATP ™ value might be a result of increased biodegradation activity in the SB-AnMBR system.
{"title":"Sludge-bed anaerobic membrane bioreactor treating prehydrolysis liquor (PHL): correlation of cATP™ with performance parameters","authors":"Mayur Milan Kale, Kripal Singh, Dibyendu Debnath, Dennis A. Connor","doi":"10.2166/WQRJC.2017.004","DOIUrl":"https://doi.org/10.2166/WQRJC.2017.004","url":null,"abstract":"Cellular adenosine triphosphate (cATP ™ ) may be used to characterize the biological degradation activity within the anaerobic and aerobic wastewater treatment systems. The feasibility of using cATP ™ as a process monitoring parameter for an anaerobic membrane bioreactor was evaluated. Results obtained from batch respirometric anaerobic treatability studies and a continuous sludge-bed anaerobic membrane bioreactor (SB-AnMBR) treating prehydrolysis liquor were examined. Both studies were conducted at an operating temperature of 35 °C. The batch studies indicated that the indirect activity measurements, such as the methane production rate correlated well with cATP ™ . The cATP ™ content of the SB-AnMBR responded to changes in total amount of degraded chemical oxygen demand (COD) and methane produced with correlation coefficient of 0.91 and 0.80, respectively. In contrast, cATP ™ was not well correlated to mixed liquor volatile suspended solids with correlation coefficient of 0.52. The values of cATP ™ /COD removed ratio and active biomass ratio (ABR ™ ) indicated that the increase in cATP ™ value might be a result of increased biodegradation activity in the SB-AnMBR system.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2017-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/WQRJC.2017.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46967890","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}
Five years ago the publication of this journal was passed from the Canadian Association on Water Quality (CAWQ) to IWA Publishing and the journal has certainly been faring well since, with a significant increase in impact factor and a growing number of submissions. This reflects its more global appeal, obtained thanks to IWA Publishing's international reach. Transferring the publication to IWA Publishing had exactly that intent: attracting more international submissions and reaching a more global audience. And it has worked! Still, perhaps some potential authors and readers thought that our journal – given its name – was only publishing research from and for Canadian researchers. Also, up to 2014 the journal's scope included a statement that reinforced …
{"title":"Editorial: What's in a name (change)?","authors":"P. Vanrolleghem, R. Droste","doi":"10.2166/wqrjc.2017.101","DOIUrl":"https://doi.org/10.2166/wqrjc.2017.101","url":null,"abstract":"Five years ago the publication of this journal was passed from the Canadian Association on Water Quality (CAWQ) to IWA Publishing and the journal has certainly been faring well since, with a significant increase in impact factor and a growing number of submissions. This reflects its more global appeal, obtained thanks to IWA Publishing's international reach.\u0000\u0000Transferring the publication to IWA Publishing had exactly that intent: attracting more international submissions and reaching a more global audience. And it has worked! Still, perhaps some potential authors and readers thought that our journal – given its name – was only publishing research from and for Canadian researchers. Also, up to 2014 the journal's scope included a statement that reinforced …","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2017-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/wqrjc.2017.101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42807273","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}
Ammonium nitrogen recovery using natural zeolite from the permeates of anaerobic membrane bioreactors was investigated with batch and continuous experiments. Regeneration of exhausted zeolite was compared between mechanical shaking and air stripping, and experimental results showed the superiority of air stripping over the shaking. Liquid circulation and air flow rates were optimized in a continuous zeolite-packed column with a separate recovery system consisting of a regeneration chamber and a stripping column. The liquid circulation rate had significant effect neither on the regeneration efficiency ( RE ) nor the ammonia transfer efficiency ( ATE ), while the ATE significantly increased with increasing air flow rate. The effect of pH on ammonia recovery was also tested and the results showed that both RE and ATE significantly improved at alkaline pH. When pH increased from 9.5 to 12, the RE increased from 9.2% to 84% and the ATE increased from 54% to 92%. The results emphasized that the pH should be higher than 11 for efficient regeneration and recovery of ammonia. The preliminary economic analysis showed the superiority of the alkaline regeneration–air stripping process over the high pH regeneration and the conventional regeneration.
{"title":"Simultaneous regeneration of exhausted zeolite and nitrogen recovery using an air stripping method at alkaline pH","authors":"Qiaosi Deng, E. Elbeshbishy, Hyung-Sool Lee","doi":"10.2166/WQRJC.2016.007","DOIUrl":"https://doi.org/10.2166/WQRJC.2016.007","url":null,"abstract":"Ammonium nitrogen recovery using natural zeolite from the permeates of anaerobic membrane bioreactors was investigated with batch and continuous experiments. Regeneration of exhausted zeolite was compared between mechanical shaking and air stripping, and experimental results showed the superiority of air stripping over the shaking. Liquid circulation and air flow rates were optimized in a continuous zeolite-packed column with a separate recovery system consisting of a regeneration chamber and a stripping column. The liquid circulation rate had significant effect neither on the regeneration efficiency ( RE ) nor the ammonia transfer efficiency ( ATE ), while the ATE significantly increased with increasing air flow rate. The effect of pH on ammonia recovery was also tested and the results showed that both RE and ATE significantly improved at alkaline pH. When pH increased from 9.5 to 12, the RE increased from 9.2% to 84% and the ATE increased from 54% to 92%. The results emphasized that the pH should be higher than 11 for efficient regeneration and recovery of ammonia. The preliminary economic analysis showed the superiority of the alkaline regeneration–air stripping process over the high pH regeneration and the conventional regeneration.","PeriodicalId":54407,"journal":{"name":"Water Quality Research Journal of Canada","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2016-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2166/WQRJC.2016.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67982190","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：