这项工作的目的是评估膜过滤产生的水的生物稳定性。这一特定目标包括在一个涉及高颜色地下水处理的大型试点项目的其他目标中。本文讨论的项目部分在欧文牧场水区试验设施进行，为期近九个月。将平均颜色约为160单位、TOC在10至12 mg/L之间的地下水送入多级膜过滤系统。使用标称分子量截止值为1000道尔顿的螺旋缠绕磺化聚醚砜膜。该装置的平均水回收率为89%，比生产率为0。 23和0.36加仑/天/平方英尺/磅/平方英寸。平均TDS排斥率为15%。膜渗透质量一直非常好，颜色低于5个单位，平均TOC为0.63 mg/L，平均浊度为0.17 NTU。在八个多月的时间里，通常每两到三周监测一次原始地下水、膜渗透和膜排斥的生物稳定性。以下方法用于此目的:利用假单胞菌荧光P17和螺菌菌株NOX的可同化有机碳（AOC）；使用混合菌群的可生物降解溶解有机碳（BDOC）；通过直接观察附着在试样上的细菌细胞来确定原地微生物的生长速率（GR）。结果表明，膜过滤对水支持微生物生长的能力的影响是复杂的，并表明微生物转化可能在膜过滤中发挥重要作用。

The objective of this work was to evaluate the biological stability of water produced by membrane filtration. This particular objective was included among other objectives of a large scale pilot project involving treatment of highly colored groundwater. The part of the project discussed in this paper was conducted at the Irvine Ranch Water District pilot facility during a period of almost nine months. Groundwater with an average color of approximately 160 units and TOC between 10 and 12 mg/L was fed to a multi-stage membrane filtration system. Spiral-wound sulfonated polyether sulfone membranes with a nominal molecular weight cut-off of 1000 daltons were used. The installation operated at an average water recovery of 89% and specific productivity between 0.23 and 0.36 gpd/sq.ft./psi. Average TDS rejection was 15%. Membrane permeate quality was consistently very good with color below 5 units, average TOC of 0.63 mg/L and average turbidity of 0.17 NTU. Biological stability of raw groundwater, membrane permeate and membrane reject was monitored generally every two to three weeks for over eight months. The following methods were used for this purpose: Assimilable Organic Carbon (AOC) using both Pseudomonas fluorescence P17 and Spirillum strain NOX; Biodegradable Dissolved Organic Carbon (BDOC) using a mixed bacterial population; Growth Rate (GR) of autochthonous microorganisms determined through direct observations of bacterial cells attached to test coupons. The results indicate that the effects of membrane filtration on the ability of water to support microbial growth are complex and indicate that microbial transformations may play an important role in membrane filtration.