不同通风方式对污泥堆肥的影响

采用2种通风方式和5种调理剂进行污泥堆肥,堆温均能顺利达到设定温度(60℃),并能保持一段高温期,堆肥产品的卫生学指标达到了无害化国家标准.同采用正压强制通风相比,采用自然通风与正压强制通风相结合方式,堆温上升迅速,能耗更低.但正压强制通风能加快堆料含水率的降低和有机质的降解.堆料含水率能极大地影响污泥堆肥过程,堆料的含水率不宜超过80%,在污泥堆肥过程中不必对堆料的pH值进行调整.

Effect on Sewage Sludge Composting with Different Aeration Modes

Two kinds of aeration modes, five kinds of amendment were tested in sewage sludge composting. The pile temperature rose to the set temperature(60 degrees C) and could maintain some thermophilic period. The pathogen reduction of sewage sludge compost met with the control standard. Compared with positive forced aeration, the natural aeration combined with positive forced aeration made the pile temperature rise faster and consume less energy. However, the positive forced aeration could accelerate the moisture content reduction and the organic matter degradation of mixtures of sewage sludge and amendment. The moisture content of raw materials affected the composting process very much, and should be less than 80%. The pH value of raw materials need to be adjusted during the sewage sludge composting process.