Study on"Two-Stage"Composting Technology of Chicken Manure in Large-Scale Chicken Farm
Composting is one of the important recycling methods to treat chicken manure.It can not only solve the chicken manure pollution,but also convert chicken manure into fertilizer,which could be used for soil improvement and soil fertility enhancement.However,in engineering application,the decomposition time of raw materials in traditional trough composting system was long,while in-vessel composting system was difficult to start because of the high moisture content of chicken manure,resulting in poor quality compost product.In this study,a"two-stage"aerobic composting process was designed.The water content of the raw materials was reduced by the primary trough composting(the first stage),so that in the in-vessel composting(the second stage),the materials were decomposed rapidly.The demonstration project with the application of this process has been completed and operated stably.After composting,the maturity of the compost product was evaluated.The results revealed that the indexes such as pH,water content,organic matter,mortality rate of ascaris eggs and seed germination met the requirements,high quality fertilizer was obtained.
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