| 摘要: |
| 以城市生活垃圾中的可腐有机物和一次发酵堆肥为研究对象，以直接堆肥、回喷自来水堆肥和回喷渗滤液堆肥3种处理方式研究了好氧堆肥渗滤液对堆肥过程的影响。结果表明，经过12 d的堆肥后，回喷渗滤液堆肥处理的温度明显高于直接堆肥和回喷自来水堆肥；一次发酵结束后，与初始物料相比，回喷渗滤液堆肥处理的挥发性固体（VS）含量下降38％，大于直接堆肥的13％和回喷自来水的25％；发酵结束后，回喷渗滤液堆肥处理的NH4＋-N含量低于直接堆肥和回喷自来水处理；堆料中的NO3--N含量在3种堆肥处理中，前3 d没有明显区别，但在第6天降温阶段，回喷渗滤液堆肥处理的NO3--N含量为5.2 mg/g，高于直接堆肥处理的3.0 mg/g和回喷自来水处理的3.5 mg/g；对于堆料高度，回喷渗滤液堆肥的堆高下降了60％，大于其他2种堆肥处理；从堆料pH的变化来看，回喷渗滤液处理比回喷自来水处理更能加速堆肥的进程；以NH4＋-N/NO3--N之比作为堆肥腐熟的判断指标，回喷渗滤液堆肥处理的NH4＋-N/NO3--N比值为0.019，比其他处理的更小。可见，回喷渗滤液在一定条件下可加速堆肥的腐熟。 |
| 关键词: 城市生活垃圾 好氧堆肥 渗滤液 堆肥腐熟度 |
| DOI： |
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| 基金项目:陕西省科技攻关项目（2003K02-G13-03;2005K02-G05-04） |
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| Leachate recycling during municipal solid waste aerobic composting process |
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| Abstract: |
| Municipal solid waste was composted in laboratory device with aeration to study the effect of compost leachate recycling on biodegradation.The three types of composting including direct composting,tap water recycling composting and leachate recycling composting were studied during the main biodegradation phase.The results indicated as follows:the temperature of leachate recycling composting was much higher than those of direct composting and water recycling composting;volatile solid (VS) content of leachate recycling composting decreased 38%,VS content of direct composting decreased 13%,and VS content of water recycling composting decreased 25%;NH4＋-N content of leachate recycling composting was higher than that of the other composting,owing to NH4＋-N accumulating;there was no distinction about NO3--N content among all the composting at the beginning,but in the end NO3--N content of leachate recycling composting was 5.2 mg/g,while the content of direct composting was over 3.0 mg/g and 3.5 mg/g of water recycling composting;compost height of leachate recycling composting decreased more than that of the other composting;Judging from variation of pH,composting was accelerated by leachate recycling;compost maturity could depend on NH4＋-N/NO3--N ratio.Leachate recycling composting was better than the other composting because NH4＋-N/NO3--N ratio of leachate recycling composting was lower than that of the others. |
| Key words: municipal solid waste(MSW),aerobic composting,leachate,maturity |
