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Evaluation of an MBR-RO system to produce high quality reuse water: Microbial control, DBP formation and nitrate

机译:评估MBR-RO系统产生高质量的回用水的方法:微生物控制,DBP形成和硝酸盐

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A membrane bioreactor and reverse osmosis (MBR-RO) system was developed to assess potential reuse applications of municipal wastewater. The objective of the study was to examine the water quality throughout the system with a focus on waterborne pathogens, disinfection by-products (DBPs) and nitrate. This paper will discuss the presence of these contaminants in MBR effluent and focus on their subsequent removal by RO. This study has shown that high quality reuse water can be produced from municipal wastewater through the use of an MBR-RO system. The water meets California Title 22 reuse regulations for non-potable applications and US EPA drinking water limits for trihalomethanes (THM) (80 μg/L), haloacetic acids (HAA) (60 μg/L), chlorite (1.0 mg/L), total coliform (not detectable), viruses (not detectable), and nitrateitrite (10 mg N/L). However, THM formation (182-689 μg/L) attributed to cleaning of the MBR with chlorine and incomplete removal by subsequent RO treatment resulted in reuse water with THM levels (40.2 ± 19.9 μg/L) high enough to present a potential concern when considering drinking water applications. Nitrate levels of up to 3.6 mg N/L, which resulted from incomplete removal by the RO membrane, are also a potential concern. A denitrification step in the MBR should be considered in potable water applications.
机译:开发了膜生物反应器和反渗透(MBR-RO)系统来评估市政废水的潜在再利用应用。该研究的目的是检查整个系统的水质,重点是水生病原体,消毒副产物(DBP)和硝酸盐。本文将讨论MBR废水中这些污染物的存在,并将重点介绍随后通过RO去除它们。这项研究表明,通过使用MBR-RO系统可以从市政废水中产生高质量的回用水。该水符合非饮用水应用的加州第22章重复使用规定,并且符合美国EPA饮用水中三卤甲烷(THM)(80μg/ L),卤乙酸(HAA)(60μg/ L),亚氯酸盐(1.0 mg / L)的限制,总大肠菌群(不可检出),病毒(不可检出)和硝酸盐/亚硝酸盐(10 mg N / L)。但是,THM的形成(182-689μg/ L)归因于用氯清洁MBR以及随后的RO处理未完全去除,导致再利用水的THM水平(40.2±19.9μg/ L)足够高,在出现以下情况时可能引起关注考虑使用饮用水。由于反渗透膜未完全去除而导致的硝酸盐含量高达3.6 mg N / L也是一个潜在的问题。在饮用水应用中,应考虑MBR中的反硝化步骤。

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