THE EVALUATION METHODS AND INDEX SYSTEM OF REVERSE OSMOSIS MEMBRANE FOULING POTENTIAL OF THE INFLUENT IN WASTEWATER RECLAMATION PROCESS: A REVIEW
-
摘要: 由于污水中的有机物含量显著高于海水,因此污水再生处理反渗透(RO)系统面临比海水淡化RO系统更加严重的污堵问题。为了有效预测和控制RO膜的污堵,需要对RO系统进水污堵潜势进行全面评价。从颗粒物/胶体污堵、无机结垢、有机污堵和生物污堵4个方面,分析了目前RO系统理论研究和工程实践中常用的进水污堵潜势评价方法和指标体系的特点。针对颗粒物/胶体污堵和无机结垢,实际工程中的潜势评价与控制方法已经相对成熟。然而,目前污水再生处理RO系统的工程设计中尚无针对有机污堵和生物污堵的指标。现有研究表明,在污水再生处理RO系统中,当进水ρ(DOC)<4 mg/L时,RO膜的污堵速率显著降低,可将该数值作为RO系统进水水质设计的参考。除有机物总量外,还应综合考虑有机物分子量和亲疏水性-酸碱性等组分特性,大分子、疏水中性和酸性物质更容易沉积于RO膜面导致污堵。在生物污堵方面,现有的针对进水生物量和生物膜生长速率(BFR)的指标均不能有效反映进水的生物污堵潜势,因此,生物污堵的预防和控制,仍是未来RO系统污堵防控领域的研究重点。Abstract: Membrane fouling in the reverse osmosis (RO) system for wastewater reclamation is much more severe than that of seawater desalination, mainly due to much higher concentration of organic matters in wastewater. In order to predict and control the fouling problem of RO systems effectively, it is essential to systematically evaluate the RO membrane fouling potential of the feed water. Here, we assessed the most commonly-used indexes and methods for the evaluation of fouling potential in the theoretical research and engineering practice of the RO system, including colloid/particle fouling, inorganic scaling, organic fouling and biofouling. The evaluation and control strategies against colloid/particle fouling and inorganic scaling had been well developed in engineering practice. However, the valid indexes against organic and biological fouling are still deficient in the engineering design of the RO system for wastewater reclamation. As revealed by the recent research, the fouling rate of RO membranes for wastewater reclamation could be retarded effectively when DOC in feed water was below 4 mg/L, which could be used as an indicator of feed water in the engineering design of RO system. Besides, the total amount of organic matter, the organic fouling potential should also be evaluated based on the composition features of organic matter, including molecular weight distribution, hydrophilicity/hydrophobicity and acidity/basicity. Generally, the organic matters with higher molecular weight and hydrophobic-neutral/acidic features showed higher RO membrane fouling potential. As for biofouling, the current indexes could evaluate the total amount of microorganism in the feed water or the biofilm forming rate (BFR) of the feed water, but these indexes were usually ineffective in predicting the biofouling in engineering practice. Thus, the accurate prediction and effective control of biofouling is still the key point in the research field of fouling control for RO system.
-
Key words:
- wastewater reclamation /
- reverse osmosis /
- membrane fouling /
- fouling potential /
- evaluation index
-
王熹,王湛,杨文涛,等.中国水资源现状及其未来发展方向展望[J].环境工程,2014,32(7):1-5. 孙迎雪,胡洪营,汤芳,等.城市污水再生处理反渗透系统RO浓水的水质特征[J].环境科学与技术,2015,38(1):72-79. SINGH R. Analysis of energy usage at membrane water treatment plants[J]. Desalination and Water Treatment,2011,29(1/2/3):63-72. 张杉雪,张文龙,熊维,等.典型海水淡化工艺的生命周期评价[J].环境工程,2019,37(3):168-173. GREENLEE L F,LAWLER D F,FREEMAN B D,et al. Reverse osmosis desalination:water sources,technology,and today's challenges[J]. Water Research,2009,43(9):2317-2348. WACHINSKI A M,ETZEL J E. Environmental ion exchange,principles and design[J]. Metal Finishing,1997,95(12):82-83. 唐鑫.再生水氯消毒抗雌激素活性生成潜势评价及控制研究[D].北京:清华大学环境学院,2014. KHEDR M G. Membrane fouling problems in reverse osmosis desalination applications[J]. Journal of Water Reuse & Desalination,2000,10(3):8-17. 胡洪营,黄晶晶,孙艳,等.水质研究方法[M].北京:科学出版社,2015:544-545 化学工学会膜分離技術ワーキンググループ ユーザーのための実用膜分離技術[M].东京:日刊工業新聞社,1996. BOERLAGE S F E,KENNEDY M D,ANIYE M P,et al. The MFI-UF as a water quality test and monitor[J],Journal of Membrane Science, 2003,211(2):271-289. JU Y,HONG I,HONG S. Multiple MFI measurements for the evaluation of organic fouling in SWRO desalination[J]. Desalination,2015,365:136-143. JIN Y, LEE H,JIN Y O,et al. Application of multiple modified fouling index (MFI) measurements at full-scale SWRO plant[J]. Desalination,2017,407:24-32. ASTM. ASTM D4189-95:Standard Test Method for Silt Density Index (SDI) of Water. ASTM Standards 95.(Reapproved)[S].2002:7-9. 王小磊.污染密度指数和修正污染指数影响因素评测[D].天津:天津大学,2012. KHAN M T,BUSCH M,MOLINA V G,et al. How different is the composition of the fouling layer of wastewater reuse and seawater desalination RO membranes?[J]. Water Research,2014,59:271-282. 赵宇超.锅炉补给水预处理反渗透膜污染的预防和处理[D].保定:华北电力大学(河北),2008. 朱益东.YA系统反渗透膜清洗维护探讨[C]//中国核科学技术进展报告(第二卷)——中国核学会2011年学术年会论文集第2册(铀矿冶分卷、核能动力分卷(上)).北京:中国原子能出版社,2011:425-432. 陈乾荣,周辉,杜俊.反渗透装置运行中出现的问题及处理措施[J].化工设计通讯,2014,40(6):33-37. 蒋延梅.污水再生处理超滤-反渗透工艺技术经济性研究[D].北京:清华大学,2014. CHOI J S,HWANG T M,LEE S,et al. A systematic approach to determine the fouling index for a RO/NF membrane process[J]. Desalination,2009,238(1):117-127. Sawada K. The mechanisms of crystallization and transformation of calcium carbonates[J]. Pure and Applied Chemistry,1997,69(5):921-928. SCHIPPERS J C,Kostense A,Folmer H C. The effect of pretreatment of river rhine water on fouling of spiral wound reverse osmosis membrane[J]. 7th International Symposium on Fresh Water from the Sea, 1980,2:297-306. ANTONY A,LOW J H,GRAY S,et al. Scale formation and control in high pressure membrane water treatment systems:a review[J]. Journal of Membrane Science,2011,383(1):1-16. SHEIKHOLESLAMI R. Composite scale formation and assessment by the theoretical scaling potential index (SPI) proposed previously for a single salt[J]. Desalination,2011,278(1):259-267. 汤芳.污水再生处理反渗透工艺膜污染组分识别与控制[D].北京:清华大学,2016. YU T,SUN H,CHEN Z,et al. Different bacterial species and their extracellular polymeric substances (EPSs) significantly affected reverse osmosis (RO) membrane fouling potentials in wastewater reclamation[J]. Science of the Total Environment,2018,644:486-493. TANG F,HU H Y,SUN L J,et al. Fouling characteristics of reverse osmosis membranes at different positions of a full-scale plant for municipal wastewater reclamation[J]. Water Research,2016,90:329-336. 胡洪营,吴乾元,吴光学,等.污水特质(水征)评价及其在污水再生处理工艺研究中的应用[J].环境科学研究,2019,32(5):725-733. REASONER D J,GELDREICH E E. A new medium for the enumerationand subculture of bacteria from potable water[J]. Applied and Environmental Microbiology,1985,49(1): 1-7. LI G Q,YU T,WU Q Y,et al. Development of an ATP luminescence-based method for assimilable organic carbon determination in reclaimed water[J]. Water Research,2017,123: 345-352. ASTM. Standard Test Method for Enumeration of Aquatic Bacteria by Epifluorescence Microscopy Counting Procedure. ASTM Standards 85.(Reapproved):ASTM D4455-85[S].1997: 24. KOOIJ D V D,VEENENDAAL H R,BAARS-LORIST C,et al. Biofilm formation on surfaces of glass and teflon exposed to treated water[J]. Water Research,1995,29(7): 1655-1662. WANG Y H,WU Y H,TONG X,et al. Chlorine disinfection significantly aggravated the biofouling of reverse osmosis membrane used for municipal wastewater reclamation[J]. Water Research,2019,154: 246-257. VROUWENVELDER J S,KAPPELHOF J W N M,HEIJRNAN S G J,et al. Tools for fouling diagnosis of NF and RO membranes and assessment of the fouling potential of feed water[J]. Desalination,2003,157(1): 361-365. VROUWENVELDER J S,MANOLARAKIS S A,HOEK J P V D,et al. Quantitative biofouling diagnosis in full scale nanofiltration and reverse osmosis installations[J]. Water Research,2008,42(19): 4856-4868.
点击查看大图
计量
- 文章访问数: 218
- HTML全文浏览量: 17
- PDF下载量: 17
- 被引次数: 0