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摇蚊幼虫对活性污泥沉降性能的影响及机理

Keywords: 摇蚊幼虫,活性污泥,沉降性能,胞外聚合物,摇蚊幼虫分泌物

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Abstract:

为了利用摇蚊幼虫改善活性污泥的沉降性能,以摇蚊幼虫为研究对象,考查其对污泥沉降性能改善作用的影响因素并探究改善机理.结果表明:投加摇蚊幼虫可以在短时间内明显改善污泥的沉降性能.在投加幼虫密度为每克干污泥中含0.2~1.2g湿质量摇蚊幼虫时,污泥沉降性能改善效果随虫密度增加而增加.在相同虫密度(每克干污泥中含1.0g湿质量摇蚊幼虫)的情况下,摇蚊幼虫对污泥质量浓度为5g/L的活性污泥改善效果最佳.而摇蚊幼虫对污泥沉降性的改善作用与投加摇蚊幼虫后活性污泥2种主要胞外聚合物(蛋白质、多糖)含量以及蛋白质与多糖比值的降低有关.另外,长期试验证实,向污水处理反应器中连续回流摇蚊幼虫培养装置上清液可以使污泥容积指数由120mL/g降至60mg/L.

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