城市污水处理厂污泥堆肥化处理优化

Research on the Optimization of Sludge Composting Process for Municipal Wastewater Treatment Plant

以辽阳污水处理有限公司的污泥为研究对象,运用一套自制的适用于小体积发酵装置对污泥进行了高温好氧发酵堆肥处理.通过对比实验,对堆体温度、含水率等指标的变化进行了动态监测,获得了堆肥过程中各项指标的最优化组合.研究表明:通过室外通风晾晒并与调理剂混合,有利于调整生污泥水分,促进堆肥顺利启动;锯末、稻壳及稻草秸秆三种调理剂的调理效果次序为锯末>稻草秸秆>稻壳;污泥、调理剂、回流污泥最佳混合比为3∶2∶3;最后通过种子发芽实验得出堆肥污泥已经达到实际应用的要求.

Taking the sludge of a Liaoyang sewage treatment plant as an example, a fermentation device with control system was designed to carry out the thermophilic aerobic composting process. The best combination of different index can be obtained by analyzing the parameters such as temperature, water content, pH value, EC, WSOC and NH4＋ - N of thermophilic aerobic composting process. The investigation shows that it is a better way to dewater the sludge through natural air-drying followed by mixing with conditioners. Among the sawdust, rice husk and rice straw, the compost can achieve the best maturity with sawdust. The best ratio of sludge, sawdust and returned sludge is 3：2：3. Finally, the sludge treated by the thermophilic aerobic composting process can be defined maturity and applied widely according to the experiments of seed germination.