不同碳源在污水处理过程中的变化规律研究

通过对A2/O污水处理工艺长期的分析监测,探明了城市污水处理厂原水中有机物不同生物降解性及碳源赋存形态比例.原水中大部分有机物以颗粒态存在,占进水有机物的61%.原水中快速、慢速、难生物降解有机物比例分别为15.8%、54.2%和30%,快速生物降解有机物主要以溶解态存在,慢速生物降解有机物则主要以颗粒态存在.通过快速、慢速生物降解有机物的沿程监测分析,明确了两种碳源在污水处理过程中的变化规律,厌氧池与缺氧池内均存在微生物水解发酵引起的慢速生物降解有机物的转化作用,其中厌氧反应池的转化效率最高.分析计算了污水处理过程中不同碳源的转化,明确了快慢速有机物在各单元的转化和利用情况,结果指出,2 h内慢速生物降解有机物在厌氧池与好氧池转化率分别为33%和20%.从脂肪酸的种类及含量来说,厌氧池与缺氧池的脂肪酸的种类及含量均高于原水.

Variation of Different Carbon Sources in the Sewage Treatment Process

The biodegradability and speciation of organics were studied through long-term analysis of A²/O treatment. The majority of the organic matters were particle organics which accounted for 61% of the total organics. The proportions of rapidly degradable, slowly degradable and refractory organics were 15.8%, 54.2% and 30% respectively. Rapidly biodegradable organics were mainly dissolved organics while slowly biodegradable organics were particle organics. The variation of these two kinds of carbon sources was analyzed during the treatment process. It was noted that microbial hydrolysis fermentation took place in the anaerobic and anoxic tanks, which led to the transformation of slowly biodegradable organics and the anaerobic tank had the highest transformation rate. The transformation and utilization of rapidly/slowly biodegradable organics were analyzed through calculation. The results showed that the transformation efficiency of slowly biodegradable organics in the anaerobic and anoxic tanks in two hours was 33% and 20%, respectively. Furthermore, the amount and species of aliphatic acid increased in the anaerobic and anoxic tanks comparing with raw water.