摘要
为了探讨抗生素对好氧堆肥过程中酶活性及堆肥腐熟的影响,添加四环素(TC)的人粪便与锯末进行好氧堆肥试验.试验共设4个处理:CK(不添加TC)、TC100(100 mg·kg~(-1)DW(干重)TC)、TC500(500 mg·kg~(-1)DW TC)和TC1000(1000 mg·kg~(-1)DW TC).研究了堆肥温度、p H、水溶性碳、种子发芽率、脱氢酶和脲酶在21 d的不同堆肥处理中的变化特性.结果表明,堆肥中四环素浓度的增加显著抑制了堆料中温度的升高,降低了p H值,增加了水溶性碳的残留,减少了种子发芽率并阻碍了脱氢酶和脲酶的活性.堆肥的参数如堆肥温度、p H、水溶性碳和种子发芽率等指标都可以用来表征堆肥的腐熟度,以上研究结果表明堆肥中四环素浓度高达1000 mg·kg~(-1)时,四环素阻碍了粪便处理的好氧堆肥过程并影响堆肥产物的腐熟.
In order to investigate the effect of antibiotics on enzymatic activity and maturity during aerobic composting of human feces using sawdust as bulky carrier,tetracycline(TC)was added to composting system at four different concentrations(0,100,500 and 1000 mg·kg~(-1)).Variation of temperature,p H,water-soluble carbon(WSC),germination index(GI),dehydrogenase activity and urease activity were investigated during 21 d composting process in batch mode.It was found that with the increase of TC concentration,temperature increase during the aerobic composting was inhibited,p H was lowered,WSC residue was increased,GI was decreased,and the dehydrogenase and urease activity was also hindered.The parameters such as temperature,p H,WSC and GI could all be employed as indicators to evaluate the compost maturity.Overall,it was indicated that when the concentration of TC was higher than 1000 mg·kg~(-1),aerobic composting process and the maturity of final compost were inhibited.
引文
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