不同净水处理工艺出水水质指标AOC、TOC、HPC的变化比较

Comparison of Effluent Quality Variation of AOC,TOC and HPC Values for Different Purification Processes

为了解不同净水工艺处理水中可同化有机物(AOC)、总有机碳(TOC)、异养菌数(HPC)的变化,在取自两个不同水源的三家水厂进行了从进水到出厂水及管网水的各单元工艺出水的测定。结果表明对H江、Q水库而言,TOC高其相对应AOC也高。原水经加氯杀藻或厂内预氯化处理后AOC会有所增加,经过混凝、沉淀、砂滤处理后AOC有所降低,经臭氧活性炭的出水AOC也会有所减少。深度处理工艺出厂水较原水AOC有所减少,常规处理工艺则会出现反超现象。对深度处理水厂来说,经活性炭处理后出水HPC均较进水有所增加,但经加氯胺消毒的出厂水中HPC大为减少。深度处理水厂在处理过程中TOC随工艺过程逐步降低,其中经混凝、沉淀、过滤去除的TOC较后续臭氧活性炭去除的要多。不同出厂水质所引起的管网AOC、HPC的变化规律各不相同,一般水源水质好TOC低,且出厂AOC低,管网水HPC变化就小,三个指标是相关联的。

In order to clarify the variation of AOC, TOC and HPC of water treated by different water purification process, the qualities of influent, finished water and network water in 3 water plants with 2different raw water were examined. The results show that the higher TOC is, the higher AOC is. AOC increases when raw water is treated by algae-killing with chlorination or by pre-chlorination and decreases after coagulation, sedimentation and sand filtration. AOC also decreases after ozonation and activated carbon filtration. AOC of finished water treated by advanced treatment process is less than that of raw water, whereas AOC of finished water treated by conventional treatment process might be more than that of raw water. HPC of water treated by activated carbon increases compared with that in influent, but HPC of finished water treated by chloramines disinfection decreases greatly for advanced treatment water plant. TOC decreases gradually through treatment process, and TOC removed by coagulation, sedimentation and sand filtration is more than that removed by 03- BAC for advanced treatment water plant. The variation of AOC and HPC in network is different according to quality of finished water. Generally speaking, the better quality of raw water is, the lower TOC and AOC are, and the less variation of HPC in network is. Such 3 indexes are associated.