欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

污染控制技术及原理

Leachate composition changes over time: data from the Laogang Landfill in Shanghai

基金项目：国家自然科学基金(No.20177014);教育部2005年重大科技项目(No.305005);2005上海市科委重大项目(No.05DZ12003)

摘要：通过对上海老港填埋场不同年份渗滤液样品的分析,测定了以下参数:电导率、ORP、COD_Cr、NPOC、NH₄sup>+-N、TN、正磷酸盐与总磷、pH、阴离子(F^-、Cl^-、Br^-、SO₄₂-),并建立了各参数与时间的关系.发现不同的渗滤液指标随填埋时间延长,其变化趋势略有差异,其中NPOC、COD、N、P、pH、电导率等指标值随时间的延长,总体表现为降低趋势;而ORP则逐渐升高;阴离子等变化趋势不明显,呈现波动趋势.对于相同变化趋势的指标,其降解过程也并不一致,对于含C物质——NPOC和COD,经4a降解后分别达到<500mg·L^-1和<2000mg·L^-1;对于含N物质,则可分为3个阶段,前4a为快速降解阶段,随后3a为中速降解,最后进入慢速降解阶段稳定在500mg·L^-1以内;TP含量随填埋时间在开始的9a内降解迅速,从35mg·L^-1降到3.4mg·L^-1,此后基本维持稳定值;pH值则在开始的7a内下降较快,随后变化不大;电导率在填埋开始的7年内下降较快;而ORP则在开始的9a内上升较多.同时发现,随着填埋时间的延长,NPOC/TOC、NH₄sup>+-N/TN、正磷酸盐/TP比例总体表现为降低,SO₄sup>2-/Cl^-比例稍微有升高,最终保持在0.2左右.

Abstract：Leachate from refuse landfilled for different lengths of time was collected from the Laogang Landfill in Shanghai, China, and parameters, such as conductivity、ORP、COD_Cr、NPOC、NH₄sup>+-N、TN、orthophosphate、TP、pH、 and anion concentrations (F^-、Cl^-、Br^-、SO₄sup>2-) were determined, and the relationships between these parameters and time were correlated. Over time, the values of some parameters, such as NPOC、COD、N、P、pH、conductivity, generally decreased while ORPincreased and anion concentrations fluctuated. NPOCand CODdecreased quickly in the first 4 years to <500 mg·L^-1 and <2000 mg·L^-1, respectively. The decomposition process of Ncan be divided into three stages, i.e., fast degradation in the first 4 years, slow degradation in the next 3 years, and slower degradation in the last 6 years, to a final concentration of around 500 mg·L^-1. TPdecreased quickly in the first 9 years, and then reached a stable value of around 3.4 mg·L^-1. The pHdeclined slightly in the first 7 years, and then reached an approximately stable value of around 7.5. Conductivity decreased rapidly in the initial 7 years after landfilling, while ORPincreased markedly in the first 9 years. It was also found that the ratios of NPOC/TOC、NH₄sup>+-N/TNand orthophosphate/TPin the leachates declined in general with landfill time, while the ratio of SO₄sup>2-/Cl^- increased slightly, ultimately reaching about 0.2.