Enhanced aerobic composting degradation and nitrogen conversion of kitchen waste by exogenous enzymes
The medium temperature amylase,glucose oxidase and β-gluconase,which were added to the pile at a ratio of 60 mg/kg.To investigate their effects and potential mechanisms on the composting cycle,nitrogen fixation effect,and organic matter degradation during the aerobic composting process.The results showed that although the addition of three exogenous enzymes did not enhance the peak performance dur-ing the high temperature period during the composting process,medium temperature amylase and glucose oxidase could significantly promote an increase in the organic matter degradation rate of compost by 3.8％～4.1％,which may be attributed to acid accumulation caused by enzymatic hydrolysis pretreatment.In addition,medium temperature amylase and β-gluconase effectively accelerated the ammonification process of compost,while glucose oxidase was beneficial for the accumulation of nitrate nitrogen,significantly increasing the nitrate nitrogen content by 6.0％.The results indicated that exogenous enzymes can pro-duce a chain reaction of enzymes,stimulating each other separately β-gluconase and dehydrogenase.
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