Abstract
A typical informal landfill in a rainy area of southern China was taken as an example in this study. The comprehensive control ideas and processes of the informal landfill site were systematically reviewed. The basic situation for the early stage of the government survey and investigation was provided, including a waste stock survey, water volume measurement, and a waste source survey. The main contents and key factors of a comprehensive investigation of the environmental quality status were briefly summarized. The water quality in the landfill, groundwater quality inside and outside of the site, and heavy metals in the bottom sediment were all determined. A low-cost practical landfill technology was explored to reduce the Chemical Oxygen Demand CODCr concentration of polyaluminum ferric chloride (PAFC), and NH4+-N was removed by calcium hypochlorite. Soil backfill was replaced, such that the informal landfill site was immobilized, which was perfectly suitable for this southern rainy area. This study proposes rules for a comprehensive improvement scheme for a landfill, and provides a reliable theoretical basis and practical experience for the treatment of similar informal landfills.
Highlights
Informal landfills refer to sites that use natural terrain conditions for waste treatment and are not constructed and operated in accordance with relevant national standards and norms [1,2]
By comparing and analyzing the detection data of G2 and G3, it was found that the number of indicators and pollutants exceeding the limits outside the site were far lower than those inside the site, indicating that the environmental quality of the off-site groundwater is less affected by the landfill leachate
It was found that the number of indicators and pollutants exceeding the limits outside the site were far lower than those inside the site, indicating that the environmental quality of the off-site groundwater is less affected by the landfill leachate
Summary
Informal landfills refer to sites that use natural terrain conditions for waste treatment and are not constructed and operated in accordance with relevant national standards and norms [1,2]. They are characterized by unsophisticated construction, lack of environmental protection measures, and a high risk of environmental pollution. They are considered informal landfills because of the lack of a sound seepage control system and garbage leachate collection and treatment facilities. Heavy seasonal rains and subsequent water flow causes surrounding surface water and soil environment pollution [8,9,10]
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