关键词: 生活垃圾卫生填埋场, 调查, 评价, 治理

Abstract: In order to understand the pollution characteristics of waste landfill sites in a coastal area, the garbage composition, landfill gas, leachate, heavy metals in humus soil of four waste landfill sites were detected and analyzed. Single factor pollution index method and comprehensive pollution index method were used to evaluate the pollution. The landfill waste was mainly composed of humus soil, plastic, debris, and textiles. There were significant exceedances of H2S, NH3, odor concentration, and non methane total hydrocarbons in each landfill site, especially with the highest pollution index for odor concentration and non methane total hydrocarbons. The suspended solids, CODCr, total nitrogen, and ammonia nitrogen in the leachate exceeded the standard most severely, with ammonia nitrogen concentration reaching 48.79-174.36 times the standard value and CODCr concentration reaching 4.18-197.84 times the standard value. The total chromium concentration in the leachate of site D reached 151.70 times the standard value. The upper humus soil and bottom soil of the four landfill sites both have local heavy metal exceedances. The single factor pollution index method evaluation results showed that there was slight nickel pollution in the upper humus soil of site A. According to the Nemerow index calculation results, the heavy metals in the upper humus soil of sites A and D were still in a unpolluted state, while the rest of the upper humus soil and subsoil were 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: domestic waste sanitary landfill site, investigation, evaluation, treatment