南京地区简易生活垃圾堆场的污染现状和稳定化评价

Pollution status and stabilization assessment of an open dumping site in Nanjing

针对南京市废弃简易生活垃圾堆场,通过采集和分析渗滤液以及堆体不同深度固体样品,研究其污染现状和稳定化程度。结果表明,渗滤液COD、NH3-N、TN超标倍数分别为4～6倍、7～10倍和4～10倍;固体样品TOC含量在10%左右,含水率在25%左右,均处于基本稳定的水平;固体样品浸出液COD 39～249 mg/L、NH3-N 0.9～14.88 mg/L、TN 8.82～28.14 mg/L。为了评价稳定化程度,确定了3因子:渗滤液、固体样品、浸出液及6个参数:COD,NH3-N,含水率,TOC,COD,TN作为评价指标,评价结果表明堆场处于基本稳定到中度稳定阶段。

Solid samples at different depths and leachate samples were collected and analyzed in order to investigate the pollution status and stabilization degree of the open dumping sites in Nanjing.The results showed that the organic matter contents in leachate were very high,with the COD,NH3-N and TN exceeded the relative limited value 4～6,7～10 and 4～10 times,respectively.The TOC value was about 10% and the moisture content was around 25% in the majority solid samples,which indicated that the dumping site was in its basic stabilization stage.The leachate of the solid samples were within the criteria,with COD 39～249 mg/L,NH3-N 0.9～14.88 mg/L,TN 8.82～28.14 mg/L.Then,COD and NH3-N in leachate,COD and TN in leaching solution,TOC and moisture content in solid samples were selected as stabilization assessment index and an assessment was conducted on the site.According to the assessment result,the stabilization degree of the dumping site was between basic stabilization and middle stabilization.