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Evaluation of an MBR–RO system to produce high quality reuse water:
Microbial control, DBP formation and nitrate
Abstract
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 mg/L), haloacetic acids (HAA) (60 mg/L), chlorite (1.0 mg/L), total coliform (not
detectable), viruses (not detectable), and nitrate/nitrite (10 mg N/L). However, THM formation (182–689 mg/L)
attributed to cleaning of the MBR with chlorine and incomplete removal by subsequent RO treatment resulted in reuse
water with THM levels (40.2719.9 mg/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.
r 2005 Elsevier Ltd. All rights reserved.
Keywords: Water reuse; Reverse osmosis; Membrane bioreactor; MS2 coliphage; Disinfection by-products; Nitrate |
发表于 2007-11-10 05:43:20
MBR_RO系统生产高质量回用水的研究
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发表于 2009-2-16 10:22:16
