Membrane Water Treatment最新文献_第8页

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

Adsorption of microcystin onto activated carbon: A review 活性炭吸附微囊藻毒素的研究进展

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-11-01 DOI: 10.12989/MWT.2019.10.6.405

Rita E. Ampiaw, M. Yaqub, Wontae Lee

{"title":"Adsorption of microcystin onto activated carbon: A review","authors":"Rita E. Ampiaw, M. Yaqub, Wontae Lee","doi":"10.12989/MWT.2019.10.6.405","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.6.405","url":null,"abstract":"Microcystins (MCs) are toxins produced by cyanobacteria causing a major environmental threat to water resources worldwide. Although several MCs have been reported in previous studies, microcystin-LR (m-LR) has been extensively studied as it is highly toxic. Among the several techniques employed for the removal of this toxin, adsorption with AC has been extensively studied. AC has gained wide attention as an effective adsorbent of m-LR due to its ubiquity, high sorption capacity, cost effectiveness and renewability. In this review, the adsorption of m-LR onto AC was evaluated using the information available in existing scientific literature. The effects of the pore volume and surface chemistry of AC on the adsorption of m-LR considering the structural and chemical properties of ACs were also discussed. Furthermore, we identified the parameters that influence adsorption, including natural organic matter (NOM), pH, and ionic strength during the m-LR adsorption process. The effect of these parameters on MCs adsorption onto AC from previous studied is compiled and highlighted. This review may provide new insights into future activated carbon-m-LR adsorption research, and broaden its application prospects.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"405-415"},"PeriodicalIF":1.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48794335","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

Performance evaluation of organic matter adsorption from actual graywater using GAC: Orbitrap GAC:Orbitrap对实际灰水中有机物吸附性能的评价

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-11-01 DOI: 10.12989/MWT.2019.10.6.471

Mayzonee Ligaray, Minjeong Kim, J. Shim, Jongkwan Park, K. Cho

{"title":"Performance evaluation of organic matter adsorption from actual graywater using GAC: Orbitrap","authors":"Mayzonee Ligaray, Minjeong Kim, J. Shim, Jongkwan Park, K. Cho","doi":"10.12989/MWT.2019.10.6.471","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.6.471","url":null,"abstract":"The complex combination of organic contaminants in the wastewater made water treatment challenging; hence, organic matter in water bodies is usually measured in terms of organic carbon. Since it is important to identify the types of compounds when deciding suitable treatment methods, this study implemented a quantitative and qualitative analysis of the organic matter content in an actual graywater sample from Ulsan, Republic of Korea using mass spectroscopy (MS). The graywater was treated using adsorption to remove the organic contaminants. Using orbitrap MS, the organic matter content between an untreated graywater and the treated effluent were compared which yielded a significant formula count difference for the samples. It was revealed that CHON formula has the highest removal count. Isotherm studies found that the Freundlich equation was the best fit with a coefficient of determination (R2) of 0.9705 indicating a heterogenous GAC surface with a multilayer characteristic. Kinetics experiments fit the pseudo-second order equation with an R2 of 0.9998 implying that chemisorption is the rate-determining step between the organic compounds and GAC at rate constant of 52.53 g/mg•h. At low temperatures, the reaction between GAC and organic compounds were found to be spontaneous and exothermic. The conditions for optimization were set to achieve a maximum DOC and TN removal which yielded removal percentages of 94.59% and 80.75% for the DOC and TN, respectively. The optimum parameter values are the following: pH 6.3, 2.46 g of GAC for every 30 mL of graywater sample, 23.39 hrs contact time and 38.6 Celcius degree.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"471-484"},"PeriodicalIF":1.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44088933","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

Effect of different conditions on pervaporation dehydration in CA/NYL66 blend membrane 不同条件对CA/NYL66共混膜渗透蒸发脱水的影响

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-11-01 DOI: 10.12989/MWT.2019.10.6.441

A. Kazemzadeh, S. Mousavi, J. Mehrzad, A. Motavalizadehkakhky, M. Hosseiny

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

Clay adsorptive membranes for chromium removal from water 粘土吸附膜去除水中铬

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-07-01 DOI: 10.12989/MWT.2019.10.4.259

F. Kashaninia, H. Rezaie, H. Sarpoolaky

{"title":"Clay adsorptive membranes for chromium removal from water","authors":"F. Kashaninia, H. Rezaie, H. Sarpoolaky","doi":"10.12989/MWT.2019.10.4.259","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.4.259","url":null,"abstract":"Cost effective clay adsorptive microfiltration membranes were synthesized to remove Cr (III) from high polluted water. Raw and calcined bentonite were mixed in order to decrease the shrinkage and also increase the porosity; then, 20 wt% of carbonate was added and the samples, named B (without carbonate) and B-Ca20 (with 20 wt% calcium carbonate) were uniaxially pressed and after sufficient drying, fired at 1100 degree(C) for 3 hours. Then, physical and mechanical properties of the samples, their phase analyses and microstructure and also their ability for Cr(III) removal from high polluted water (including 1000 ppm Cr (III) ions) were studied. Results showed that the addition of calcium carbonate lead the porosity to increase to 33.5% while contrary to organic pore formers like starch, due to the formation of wollastonite, the mechanical strength not only didn't collapse but also improved to 36.77 MPa. Besides, sample B-Ca20, due to the presence of wollastonite and anorthite, could remove 99.97% of Cr (III) ions. Hence, a very economic and cost effective combination of membrane filtration and adsorption technology was achieved for water treatment which made microfiltration membranes act even better than nanofiltration ones without using any adsorptive nano particles.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"259-264"},"PeriodicalIF":1.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49356013","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

Hydrophobic modification of PVDF hollow fiber membranes using polydimethylsiloxane for VMD process 聚二甲基硅氧烷在VMD工艺中对PVDF中空纤维膜进行疏水改性

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-07-01 DOI: 10.12989/MWT.2019.10.4.251

Z. Cui, Daqing Tong, Xue Li, Xiaozu Wang, Zhaohui Wang

引用次数: 0

Preparation of highly hydrophobic PVDF hollow fiber composite membrane with lotus leaf-like surface and its desalination properties 高疏水性荷叶状PVDF中空纤维复合膜的制备及其脱盐性能

IF 1 4区工程技术

Membrane Water Treatment Pub Date : 2019-07-01 DOI: 10.12989/MWT.2019.10.4.287

Hongbin Li, X. Zi, Wenying Shi, Longwei Qin, Haixia Zhang, X. Qin

{"title":"Preparation of highly hydrophobic PVDF hollow fiber composite membrane with lotus leaf-like surface and its desalination properties","authors":"Hongbin Li, X. Zi, Wenying Shi, Longwei Qin, Haixia Zhang, X. Qin","doi":"10.12989/MWT.2019.10.4.287","DOIUrl":"https://doi.org/10.12989/MWT.2019.10.4.287","url":null,"abstract":"Lotus leaf has a special dual micro and nano surface structure which gives its highly hydrophobic surface characteristics and so-called self cleaning effect. In order to endow PVDF hollow fiber membrane with this special structure and improve the hydrophobicity of membrane surface, PVDF hollow fiber composite membranes was obtained through the immersion coating of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) dilute solution on the outside surface of PVDF support membrane. The prepared PVDF composite membranes were used in the vacuum membrane distillation (VMD) for the desalination. The effects of PVDF-HFP dilute solution concentration in the dope solution and coating time on VMD separation performance was studied. Membranes were characterized by SEM, WCA measurement, porosity, and liquid entry pressure of water. VMD test was carried out using 35 g.L-1 NaCl aqueous solution as the feed solution at feed temperature of 30 degree(C) and the permeate pressure of 31.3 kPa. The vapour flux reached a maximum when PVDF-HFP concentration in the dilute solution was 5 wt% and the coating time was kept in the range of 10-60 s. This was attributed to the well configuration of micro-nano rods which was similar with the dual micro-nano structure on the lotus leaf. Compared with the original PVDF membrane, the salt rejection can be well maintained which was greater than 99.99 % meanwhile permeation water conductivity was kept at a low value of 7-9 uS.cm-1 during the continuous testing for 360 h.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":"10 1","pages":"287-298"},"PeriodicalIF":1.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47442614","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: 3