Membrane Water Treatment最新文献_第5页

Aqueous U(VI) removal by green rust and vivianite at phosphate-rich environment 富磷环境下绿锈和绿辉石对水中U(VI)的去除

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.3.207

Y. Sihn, I. Yoon

引用次数: 5

Study of nitrate concentration in Najaf Abad aquifer using GIS 基于GIS的纳贾巴德含水层硝酸盐浓度研究

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.2.167

J. Tabatabaei, L. Gorji

引用次数: 0

Influence of counter anions on metal separation and water transport in electrodialysis treating plating wastewater 反阴离子对电渗析处理电镀废水中金属分离和水迁移的影响

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.3.201

E. Oh, J. Kim, Junhee Ryu, K. Min, Hyun-Gon Shin, K. Park

引用次数: 1

Removal of Pb(II) from wastewater by biosorptionusing powdered waste sludge 粉末状废污泥生物吸附去除废水中的铅(II)

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.1.041

Hana Jang, N. Park, Hyokwan Bae

{"title":"Removal of Pb(II) from wastewater by biosorptionusing powdered waste sludge","authors":"Hana Jang, N. Park, Hyokwan Bae","doi":"10.12989/MWT.2020.11.1.041","DOIUrl":"https://doi.org/10.12989/MWT.2020.11.1.041","url":null,"abstract":"Lead is a highly toxic heavy metal that causes serious health problems. Nonetheless, it is increasingly being used for industrial applications and is often discharged into the environment without adequate purification. In this study, Pb(II) was removed by powdered waste sludge (PWS) based on the biosorption mechanism. Different PWSs were collected from a submerged moving media intermittent aeration reactor (SMMIAR) and modified Ludzack-Ettinger (MLE) processes. The contents of extracellular polymeric substances were similar, but the surface area of MLE-PWS (2.07 m2/g) was higher than that of SMMIAR-PWS (0.82 m2/g); this is expected to be the main parameter determining Pb(II) biosorption capacity. The Bacillaceae family was dominant in both PWSs and may serve as the major responsible bacterial group for Pb(II) biosorption. Pb(II) biosorption using PWS was evaluated for reaction time, salinity effect, and isotherm equilibrium. For all experiments, MLE-PWS showed higher removal efficiency. At a fixed initial Pb(II) concentration of 20 mg/L and a reaction time of 180 minutes, the biosorption capacities (qe) for SMMIAR- and MLE-PWSs were 2.86 and 3.07 mg/g, respectively. Pb(II) biosorption using PWS was rapid; over 80% of the maximum biosorption capacity was achieved within 10 minutes. Interestingly, MLE-PWS showed enhanced Pb(II) biosorption with salinity values of up to 30 g NaCl/L. Linear regression of the Freundlich isotherm revealed high regression coefficients (R2 > 0.968). The fundamental Pb(II) biosorption capacity, represented by the KF value, was consistently higher for MLE-PWS than SMMIAR-PWS.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"11 1","pages":"41"},"PeriodicalIF":1.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66493943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of Combined Sewer Overflows on river 合流污水溢流对河流的影响

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.1.049

H. Bae

引用次数: 2

Preparation, characterization of activated carbon fiber from luffa and its application in CVFCW for rainwater treatment 丝瓜活性炭纤维的制备、表征及其在CVFCW处理雨水中的应用

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2020-01-01 DOI: 10.12989/MWT.2020.11.2.151

Sanjrani Manzoor Ahmed, Boxun Zhou, Heng Zhao, Y. Zheng, Yue Wang, S. Xia

引用次数: 0

Intermittent chlorination shifts the marine biofilm population on reverse osmosis membranes 间歇氯化改变了反渗透膜上的海洋生物膜群

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-11-01 DOI: 10.12989/MWT.2019.10.6.395

Dawoon Jeong, Chang-Ha Lee, Seockheon Lee, Hyokwan Bae

{"title":"Intermittent chlorination shifts the marine biofilm population on reverse osmosis membranes","authors":"Dawoon Jeong, Chang-Ha Lee, Seockheon Lee, Hyokwan Bae","doi":"10.12989/MWT.2019.10.6.395","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.6.395","url":null,"abstract":"The influence of chlorine on marine bacterial communities was examined in this study. A non-chlorine-adapted marine bacterial community (NCAM) and a chlorine-adapted bacterial community (CAM, bacterial community treated with 0.2 mg-Cl2/L chlorine) were cultivated for 1 month. A distinct difference was observed between the NCAM and CAM, which shared only eight operational taxonomic units (OTUs), corresponding to 13.1% of the total number of identified OTUs. This result suggested that chlorine was responsible for the changes in the marine bacterial communities. Kordiimonas aquimaris was found to be a chlorine-resistant marine bacterium. The effect of intermittent chlorination on the two marine biofilm communities formed on the reverse osmosis (RO) membrane surface was investigated using various chlorine concentrations (0, 0.2, 0.4, 0.6 and 0.8 mg Cl2/L). Although the average number of adherent marine bacteria on the RO membrane over a period of 7 weeks decreased with increasing chlorine concentration, disinfection efficiencies showed substantial fluctuations throughout the experiment. This is due to chlorine depletion that occurs during intermittent chlorination. These results suggest that intermittent chlorination is not an effective disinfection strategy to control biofilm formation.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"395-404"},"PeriodicalIF":1.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46051952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Enhancement of hydrophilicity and anti-fouling property of polysulfone membrane using amphiphilic nanocellulose as hydrophilic modifier 用两亲性纳米纤维素作为亲水改性剂提高聚砜膜的亲水性和防污性能

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-11-01 DOI: 10.12989/MWT.2019.10.6.461

X. Yang, Lifang Liu, Shuai Jiang

{"title":"Enhancement of hydrophilicity and anti-fouling property of polysulfone membrane using amphiphilic nanocellulose as hydrophilic modifier","authors":"X. Yang, Lifang Liu, Shuai Jiang","doi":"10.12989/MWT.2019.10.6.461","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.6.461","url":null,"abstract":"In the present work, we present a new effective hydrophilicity modifier for polysulfone (PSf) membrane. Firstly, amphiphilic nanocellulose (ANC) with different substitution degrees (SD) was synthesized by esterification reaction with nanocellulose (NC) and dodecyl succinic anhydride (DDSA). The SD and morphology of ANC were characterized by titration method and transmission electron microscopy (TEM). Then, the polysulfone (PSf)/ANC blend membranes were prepared via an immersion phase inversion method. The influence of SD on the morphology, structure and performances of PSf/ANC blend membrane were carefully investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), mechanical property test, contact angle measuring instrument and filtration experiment. The results showed that the mechanical property, hydrophilicity and anti-fouling property of all the PSf/ANC blend membranes were higher than those of pure PSf membrane and PSf/NC membrane, and the membrane properties were increased with the increasing of SD values. As ANC-4 has the highest SD value, PSf/ANC-4 membrane exhibited the optimal membrane properties. In conclusion, the prepared ANC can be used as an additive to improve the hydrophilicity and anti-fouling properties of polysulfone (PSf) membrane.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"461-469"},"PeriodicalIF":1.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48892418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluation of long-term water quality management policy effect using nonparametric statistical methods 非参数统计方法评价长期水质管理政策效果

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-09-01 DOI: 10.12989/MWT.2019.10.5.339

K. Jung, J. Ahn, Sohyun Cho, Y. Lee, K. Han, Dong-seok Shin, Kyunghyun Kim

{"title":"Evaluation of long-term water quality management policy effect using nonparametric statistical methods","authors":"K. Jung, J. Ahn, Sohyun Cho, Y. Lee, K. Han, Dong-seok Shin, Kyunghyun Kim","doi":"10.12989/MWT.2019.10.5.339","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.5.339","url":null,"abstract":"Long term water quality change was analyzed to evaluate the effect of the Total Maximum Daily Load (TMDL) policy. A trend analysis was performed for biochemical oxygen demand (BOD) and total phosphorus (TP) concentrations data monitored at the outlets of the total 41 TMDL unit watersheds of the Nakdong River in the Republic of Korea. Because water quality data do not usually follow a normal distribution, a nonparametric statistical trend analysis method was used. The monthly mean values of BOD and TP for the period between 2004 and 2015 were analyzed by the seasonal Mann-Kendall test and the locally weighted scatterplot smoother (LOWESS). The TMDL policy effect on the water quality change of each unit watershed was analyzed together with the results of the trend analysis. From the seasonal Mann-Kendall test results, it was found that for BOD, 7.8 % of the 41 points showed downward trends, 26.8 % and the rest 65.9% showed upward and no trends. For TP, 51.2% showed no trends and the rest 48.8% showed downward trends. From the LOWESS analysis results, TP began to decrease in most of the unit watersheds from mid-2010s when intensive chemical treatment processes were introduced to existing wastewater treatment plants. Overall, for BOD, relatively more points were improved in the main stream compared to the points of the tributaries although overall trends were mostly no trend or upward. For TP, about half of the points were improved and the rest showed no trends.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"339-352"},"PeriodicalIF":1.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48500205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Membrane fouling and sludge characteristics in submerged membrane bioreactor under low temperature 低温浸没式膜生物反应器中膜污染及污泥特性研究

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-09-01 DOI: 10.12989/MWT.2019.10.5.331

Yuan Yuan, Jianqiao Zhang

{"title":"Membrane fouling and sludge characteristics in submerged membrane bioreactor under low temperature","authors":"Yuan Yuan, Jianqiao Zhang","doi":"10.12989/MWT.2019.10.5.331","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.5.331","url":null,"abstract":"This study aimed to investigate the membrane fouling and sludge characteristics in a pilot-scale submerged membrane bioreactor (MBR) operated under low temperature (7 degree Celcius) To elucidate the mechanisms of membrane fouling at low temperature, we studied the correlation between MBR performances and physicochemical properties of sludge including extracellular polymeric substance (EPS), relative hydrophobicity (RH) and floc size during long-term operation. The MBR was shown able to remove chemical oxygen demand (COD) stably and efficiently (>90 %) in the case of overgrowth of filamentous bacteria (bulking sludge) at low temperature. On the other hand, the occurrence of filamentous bulking greatly accelerated membrane fouling, as indicated by membrane filtration period of 14 days for filamentous bulking at 7 degree Celcius, in comparison with that of 27 days for non-bulking sludge at 24 degree Celcius. The overgrowth of filamentous bacteria resulting from low-temperature condition led to an increased release of EPS, higher RH, smaller floc size and lower fractal dimension of sludge. These factors accelerated the formation of compact cake layer on membrane surface in association with performance diminution in terms of increase in transmembrane pressure (TMP) of the membrane and thus the decrease in membrane permeability.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"331-338"},"PeriodicalIF":1.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44905199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1