关键词:

生活垃圾卫生填埋场')">"> 生活垃圾卫生填埋场, 调查, 评价, 治理

Abstract:

 In order to understand the pollution characteristics of landfill sites in a coastal area, the pollution of garbage composition, landfill gas, leachate, heavy metals in humus soil was detected and analyzed. Single pollution index method and comprehensive pollution index method were used to evaluate the pollution. The landfill waste is mainly composed of humus soil, plastic, debris, and textiles. There are significant exceedances of H₂S, NH₃, odor concentration, and non methane total hydrocarbons in all landfill site, especially with the highest pollution index for odor and non methane total hydrocarbons. The suspended solids, COD_Cr, total nitrogen, and ammonia nitrogen in the leachate exceeded the standard most severely, with ammonia nitrogen concentration reaching 48-174 times the standard value and COD_Cr concentration reaching 38-197 times the standard value. The total chromium concentration in the leachate of site D reached 151.70 times the standard value. This is because the landfill site has previously filled leather products. The upper humus soil and bottom soil of the 4 landfill sites both have local heavy metal exceedances. The single factor pollution index method evaluation results show that there is slight nickel pollution in the upper humus soil of site A. According to the Nemerow index calculation results, the heavy metals in the humus soil of sites A and D are still in a unpolluted state, while the rest of the humus soil and subsoil are in a clean state. Taking into account factors such as the geographical location, economic conditions, calorific value of lightweight materials, and pollution level of the landfill site, site A is suitable for using the original ecological sealing technology for restoration, site B and C are suitable for using aerobic accelerated stabilization+in-situ ecological sealing treatment and restoration, and site D is suitable for using excavation and screening comprehensive utilization treatment.

Key words:

 ')">">  , informal landfill, investigation,  , evaluation, treatment