Effects of adding bulking agents on the biodrying of kitchen waste and the odor emissions produced

The effects of adding a bulking agent on the performance and odor emissions(ammonia and eight sulfur-containing odorous compounds) when biodrying kitchen waste were investigated. Three treatments were considered: the addition of either cornstalks(CS) or wood peat(WP) to kitchen waste as a bulking agent before biodrying, and a control treatment(CK). The water-removal rates for CK, CS, and WP treatments were 0.35, 0.56, and0.43 kg/kg, respectively. Addition of bulking agents to kitchen waste produced less leachate,higher moisture-removal rates, and lower consumption of volatile solids. The CS treatment had the highest biodrying index(4.07), and those for the WP and CK treatments were 3.67 and 1.97, respectively. Adding cornstalks or wood peat decreased NH3 emissions by 55.8%and 71.7%, respectively. Total sulfur losses were 3.6%–21.6% after 21 days biodrying, and H2 S and Me2 SS were the main( 95%) sulfur compounds released. The smallest amounts of sulfur-containing odorous compounds were emitted when cornstalks were added, and adding cornstalks and wood peat decreased total sulfur losses by 50.6%–64.8%.     

污泥生物干化/好氧堆肥工艺应用实践

阐述了目前污泥处理与处置的方法,结合污泥生物干化方法在沈阳振兴污泥处置有限公司的应用,介绍了生物干化方法的工艺流程,即在高温状态下利用生物能,使污泥彻底熟化降解,将污泥含水率由80%降至40%以下的过程。最后提出了利用生物干化工艺处置污泥在实际运行中需要注意物料传输方式的选择以及冬季除臭系统臭气收集方面的问题。