摘要
Abstract
In this paper, the sludge from domestic sewage treatment plant was treated by aerobic compost mixed with eomposted materials as additive. By analysis of the parameters including temperature, oxygen consumption rate, organic matters, moisture content, pH value and ammonia nitrogen, the effect of ventilation on composting process was studied. The results showed that the mixture of the sludge and composted materials contained low organic matters, so the eomposting rate became fast and sensitive to the ventilation condition. At the condition with ventilation rate lower than 0. 025m3/ （m3 . min）, it resulted in effects such as shortage of oxygen for composting during the initial period, low eomposting rate, long time needed, becoming anaerobic environment inside the composting pile, decreasing of pH value and more production of odors. On the contrary, the condition with ventilation rate higher that 0. 05m3/ （m3 . min） and changing the rate had advantages such as sufficient air supply, long thermophilic period, little stink gas produced and high composting speed. With variable ventilation rate, the process would save more energy.关键词
通风量/污泥/堆肥/添加剂Key words
Ventilation rate/sewage slndge/eomposting/additive分类
资源环境
