TRANSFORMATION CHARACTERISTICS OF CARBON AND NITROGEN IN SLUDGE-KITCHEN EARTHWORM COMPOST BASED ON LAND USE
Due to the low organic content of municipal residual sludge,collaborative treatment and disposal of kitchen waste has attracted wide attention.Using municipal sludge and kitchen waste as raw materials and sawdust as the conditioner,this paper investigated the process performance of co-composting and discussed the transformation characteristics of carbon and nitrogen elements under the disposal approach based on land use.The results indicated that under the conditions of(73±2)％moisture content and(23±1)℃ temperature,earthworms could survive better and improve the stability of vermicompost.Specifically,after a 60-day composting cycle,the average degradation rate of TOC in the earthworm group was about 32.62％,while that in the control group was about 27.13％.The increase rate of TN in the earthworm group was 18.90％to 29.80％,while that in the control group was 15.83％to 27.40％,and the C/N decreased obviously before and after composting.The degradation percentage of the earthworm group was higher.The growth and reproduction characteristics of earthworms in the compost environment were better with a ratio of residual sludge:kitchen waste∶sawdust=4:3∶3(by dry weight).Therefore,municipal sludge,kitchen waste,and sawdust combined with vermicomposting treatment can effectively accelerate the composting process,and improve the stability of organic matter and the degree of resource utilization,which is conducive to the subsequent land use.
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