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A Pilot Scale Study on a Human Feces Composting in Aerobic Medium Temperature Composting Reactor

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Tutor: WangXiaoChang
School: Xi'an University of Architecture and Technology
Course: Municipal Engineering
Keywords: mesophilic temperature,aerobic composting reactor,human feces,pilot scale
CLC: S141.4
Type: Master's thesis
Year:  2013
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Abstract:
This dissertation is a part of the National Natural Science Foundation ofChina£¨Grant No.51021140002£©. It aimed to achieve harmless disposal and fertilizationutilization of human feces by compost. An aerobic composting experiment wasconducted to solve the disadvantages of pilot study at the moment, a15-dayexperimental study was conducted for pilot research on aerobic composting for humanfeces by taking fresh sawdust as the blank medium with feces/sawdust at1:4on dryweight at a controlled temperature of35¡À2¡æand under aerobic condition of55%¡«60%moisture content and forced ventilation.Physical and chemical indicators were studed in this pilot test of human fecescomposting in aerobic medium temperature composting reactor,it showed that the colorof composting change from yellow to brown whith no bad smell, the average of pHvalue was8.32, GI was87.66%rotten period was8-10daysand fulfill the compostingstarndard. This study emphasized biodegradation charactration of organic matters inhuman feces by COD, the transformation of nitrogen and gaseous ammonia£¨NH3-N£©exhausted from the during methepholic aerobic composting process and the change ofbiomass and the character of microbial population structure. The result showed thatorganic matters were degraded thoroughly and reduced279.97g¡¤kg-1at last, the organiccontent was slightly increased and then fell sharply, the removal rate of71.82%couldbe finally achieved.With the increase of NH3-N release amount finally reached11.65g¡¤kg-1, the Ntotcontent in the compost began to reduce from the4thday, and the loss amount to12.71 g¡¤kg-1,percentage is22.61%ultimately, in which, the loss of Norg takes up74.35%andNH3-N takes up23.52%;91.66%of the lost nitrogen was released in form of ammonianitrogen, the rest of nitrogen still remained in compost; the compost also can protectphosphorus not to be decomposed. Dissolved organic matter in the human fecesprovides nutriment is beneficial to the growth of microorganism. Therefore, the biomasschange process has a close relationship with the organic matter degradation; theeffective removal of pathogenic bacteria during the composting process indicated thatthe compositing in the reactor is harmless.Totally, the result of pilot scale test showed that the reaction conditions werestabilized and right when the reactor was working, the removal rate of organic matterswhich is harmful to human reached a high level, and we could gain compostingproducts that can be used as fertilizer with odorless. Ecological toilet which on the basisof our reactor has higher promotion value and market prospect.
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