Title: Effect of Different Recycle Ratios of Dried Sludge on Nitrogen Loss During Sludge Composting
Abstract: Nitrogen loss is a common problem during composting of sewage sludge that affects its application.The study investigated the effect of dried sludge addition on nitrogen losses during the composting using municipal and mature dried sludge from Beijing.Five treatments,S(Sewage sludge),S+20%DS(Dried sludge),S+30%DS,S+40%DS and S+50%DS were designed in the experiment.Changes of pile temperature,content of ammonia volatilization,NH4+ -N,NO3-N and total nitrogen were monitored during composting.The results indicated that when 30%~40% dried sludge was added in the compost,the accumulation and loss of nitrogen in form of NH4+-N decreased,and less NO3-N was lost.The losses of total nitrogen were 12.26% and 9.86% in the treatments adding 30% and 40% dried sludge respectively after the composting ending.The deep black compost materials turned to gray black,loose and odorless humus,and nearly reached mature after 50 days'composting.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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