垃圾渗滤液污染场地NO_3~-、PO_4~(3-)和SO_4~(2-)对微生物活性的影响

通过实验研究垃圾渗滤液污染场地N、S、P和湿度等因素对微生物活性的影响.结果表明：同时添加N和P后,土壤和细砂中微生物活性分别在第7 天和第14 天达到最大值0.685和0.588,有机质质量分数分别降低了10.97%和22.1%,平均降解速率分别为0.405和0.190 mg/(kg·d);添加NO_3~-后,土壤和细砂中有机质质量分数分别减少了10.3%和28.9%;添加SO_4~(2-)后,土壤和细砂中有机质质量分数分别减少了8.87%和28.4%;另外,湿度为50%和60%时,土壤中微生物活性的最大值分别为0.259和0.266,有机质平均分解速率分别为0.195和0.305 mg/(kg·d).因此,N、S、P和湿度对地下环境中微生物的活性有重要影响.

Influences of NO_3~-,PO_4~(3-) and SO_4~(2-) on Bacterial Activity at Landfill Leachate Polluted Site

Experiments were conducted to investigate influences of N, S, P and humidity on microbial activity in landfill leachate polluted site. The results indicated that maximum microbial activity in soil and fine sand was up to 0.685 and 0.588 in the 7th day and the 14th day while N and P added, respectively; organic substrate decreased 10.97% and 22.1%, and its average degradation rate was 0.405 and 0.190 mg/(kg·d), respectively. Organic substrate decreased 10.3% and 28.9% for NO_3~- addition and 8.87% and 28.4% for SO_4~(2-) addition in soil and fine sand, respectively. In addition, the maximum microbial activity was 0.259 and 0.266 in soil which humidity was 50% and 60%, respectively, and the average degradation rate of organic substrate was 0.195 and 0.305 mg/(kg·d), respectively. Therefore, N, S, P and humidity had significant effects on subsurface microbial activity.