城市污水污泥发酵制园林营养土中微生物的变化分析

通过桶装发酵装置,进行城市污水污泥发酵制园林营养土过程中微生物的变化研究,测试不同好氧-厌氧交替组的发酵温度以及细菌、真菌、放线菌数量等的变化,探讨发酵温度与微生物变化的规律.结果表明,夏季不同发酵方式的发酵温度在50℃以上的持续时间均长于冬季,且夏季好氧-厌氧交替发酵的发酵温度在55℃以上的持续时间长于好氧发酵;冬季与夏季的好氧、好氧-厌氧交替发酵后,堆料中的粪大肠菌群数量均达到了《城镇污水处理厂污泥处置园林绿化用泥质》(CJ 248-2007)的卫生学指标要求;夏季好氧-厌氧交替发酵过程中,厌氧后发酵温度有所下降,好氧后发酵温度又有所回升;无论好氧还是好氧～厌氧交替发酵中,细菌均为优势种群,真菌、放线菌数量比细菌数量低2～6个数量级.

Study on the variation of microorganism in dewatered sludge fermentation by alternative method

The dewatered sludge was fermentation treated in barrel fermentation device to produce garden nutritive soil,the variation of fermentation temperature,colony numbers of bacteria,actinomycetes and fungi under different fermentation process was studied.Results showed that high temperature stage(>50 ℃) of all fermentation process was longer in summer than in winter.The aerobic-anaerobic alternating fermentation in summer duration longer period of temperature above 55 ℃ than the aerobic fermentation.After aerobic and alternating fermentation process,the number of coliforms in composting could meet the harmless requirement of "urban sewage sludge disposal for landscape utilization"(CJ 248-2007).In the summer aerobic-anaerobic alternating fermentation process,the fermentation temperature was decreased after anaerobic process and then returned after aerobic process.The bacteria was dominated biotype both in aerobic and alternating fermentation process,the number of actinomycetes and fungi was lower than that of bacteria by 2-6 orders of magnitude.