Research On Intensified Composting With Leachate Recirculated Inoculation

The problem of municipal solid waste management (MSW) and disposal hasbecome the focus and difficulty over the world. Composting of MSW is one methodthat accords with strategy of sustainable development.The moisture content of MSW in south China is enormously high. During aerobiccomposting, large quantity of leachate comes into being. Lots of experimentalinvestigations indicate that the community and construction of microorganism in rawrefuse and rubbish leachate are comprehensive. Some of these home-grownmicroorganisms have strong degradation ability for organic substances, but because ofdefective nutrition of the compost materials and the furious fluctuation of theenvironment along with the course of composting, these kinds of microorganisms cannot hold predominance in number and activity. If we take effective measures to makethese microorganisms accumulated and inoculated into the refuse compost materials,the decomposition ability of the composting course for cellulose and other organicsubstances difficult to be degraded will be improved, the content of humic substances inmaterials will be increased and the stabilization of compost materials will beaccelerated.On the ground of broadly collecting research data at home and abroad, andcompleting a lot of research work of prior stage, the Chongqing university projectresearch group for "Fifteen Task"tackling key problem follows the inherent law ofmicroorganism in refuse compost and the related principle of ecology and puts forwardthe simple and highly active refuse composting method —Intensified MSWComposting with Leachate Recirculated Inoculation, which aims at the underdevelopedstatus of technology and economy in china's western small cities.Combing this task, and using Chongqing district refuse, this article focuses on twomain researches as followings:â‘ The parameters (temperature, cellulase, NH₄⁺ -N, C:N ratio) variety due to thefunction of Leachate Recirculated Inoculation added into refuse.â‘¡The effect of Leachate Recirculated Inoculation to cellulose decomposition andnitrogen translation in MSW.On the basis of two experiments carried out, the conclusions are drawn asfollowings:â‘ As far as temperature in three different MSW composting is concerned, thegroup caught through with Leachate Recirculated Inoculation is more effective than therest, and the intervals of first-stage fermentation and composting period are shortened to1～2d,4～5d, respectively. â‘¡It is the stable pH and high level Oxygen Usage Ratio that made the cellulasekeep high level and long time. Volatile solid in macro picture showed the availableability of microbial inoculum to cellulose decomposition. â‘¢The variation of all kind of nitrogen showed that the activity of microorganismmaintained higher level in the group added with microbial inoculum than in the groupwith distilled water. But further research remains to be done to resolve the problem ofnitrogen loss.