长距离原水输水管道管壁生物膜特征分析

Characteristics of bioflims in long-distance raw water diversion pipes

摘要:

研究长距离原水输水管道管壁生物膜特征有利于分析原水水质变化原因,对保障长距离原水水质安全性具有重要意义．采用8台环状膜生物反应器（BAR）串联运行以模拟长距离原水输水管道,研究不同水质条件下,管道生物膜的形态特征、结构、生物量空间分布、微型生物种群组成．结果表明:不同水质条件下生物膜形态明显不同,管壁上黏附颗粒物的颜色是表征生物膜形态特征的重要标志;管道微生物膜结构沿程变化较大,其粗糙生物膜结构增大了生物膜比表面积,有利于生物膜的生长发育,从而有效氧化去除水中的污染物质;A江模拟管道运行75 d在BAR3处生物量达最大值(以P计)1.11 nmol·cm-2,后端因缺乏营养生物量明显降低,而B江模拟管道生物膜生长受进水DO(0.3～3.0 mg·L-1)抑制,生物量沿程变化较小;原水水质是影响生物膜微型生物组成的重要因素,微型生物组成反映管道水质状况及净水效果．

Abstract:

Studying biofilms in long-distance raw water diversion pipe is beneficial to the analysis of water quality and the security of raw water quality. Therefore, the characters of morphology, microstructure, spatial and temporal distribution of biomass and microbiota community of bio-films in long-distance raw water diversion pipes were investigated using the simulated process of 8 bio-film annulus reactors (BAR) in series with different raw water. The results showed that the bio-film structure was significant different in water quality, and the particle color attached in pipe bio-film was an important influencing factor in the characters of morphology. Secondly, the structure of the rough bio-film changing with water flow increased the specific surface area of the bio-film which led to the growth and development of bio-film and pollutant removal. Thirdly, the biomass of A raw water reached the peak(1.11 nmol·cm-2) in BAR3 running 75 d, and then became lower due to the less nutrient. However, the biomass along simulated pipes of B water changed subtly because of the limited DO(0.3-3.0 mg·L-1). Finally, the microbiota composition is highly correlated with the water quality, reacting water quality and purification effect.