城市污水厂污泥堆肥中试实验研究

Study Of Chlorobenzene's Pollution In The Songhua River

城市污水厂污泥由于产生量大且成分复杂,如何对它进行稳定化、无害化处理已越来越受到人们的关注。本研究基于好氧发酵仓式堆肥系统,研究了城市污泥处理过程中温度、含水率、pH、有机质、水溶性有机碳、总氮和发芽指数等指标参数的变化规律。研究结果表明:当物料初始含水率控制在65%左右时,在强制通风量112.5m3/12hr,搅拌频率30min/24hr的工艺条件下,堆肥过程可以实现顺利升温并在55℃以上维持3天,满足杀灭致病菌要求的条件;14天反应周期结束时,物料含水率、水溶性有机碳和有机质含量显著降低,堆肥产品腐熟,卫生学指标达到了美国EPA污泥产品A类标准;得到的污泥产品成为性质优良的土壤质量调节剂。

A great deal of municipal sludge has been producing annually, and its components are very complex. How to stabilize and dispose sewage sludge harmlessly is becoming more and more important. The changes of chemical parameters, such as temperature, moisture, pH, organic matter, water soluble organic carbon, total nitrogen and germination index were studied during the whole composting process. The optimal technological condition for composting were determined, under which the water content of initial materials, forced ventilation volume and mixing frequency were 65%, 112.5m^3/12hr, respectively. The results indicated that the temperature could reach 55℃ rapidly and lasted 3 days, it could meet the demand of sterilizing. The water content, water soluble organic carbon（WSOC） and organic matter reduced significantly during the composting process. In addition, the composing products in 14 days were almost mature, and could meet the class A hygienic standard of US EPA. The obtained composting products should become better regulator for soil fertility.