HAZARD AND CONTROL OF SECONDARY POLLUTION IN SANITARY REFUSE LANDFILLING
CHEN Jia jun & ZHANG Jun li (Institute of Environmental Science, Beijing Normal University, Beijing 100875, China) and PEI Zhao bin (Environmental Protection Bureau of Suibin County, Suibin 156200, Heilongjiang, China)
The present paper is mainly concerned with the problems caused by the current garbage landfilling technology. As is known, the problems are caused by the identification of landfill sites and secondary pollution since 1970's. The secondary pollution given off during the landfilling of the garbage and other refuse and after the landfill closure, include landfill gases, leachate and landscape pollution, etc. The impacts of the secondary pollution introduced in the paper may include methane, carbon dioxide, nitrogen, hydrogen sulfide, hydrogen and volatile organic gases. Many of them are liable to cause some hazards, such as explosion and fire accidents, underground water pollution, global warming, suffocation of plants, and disgust of human beings and animals. Among the pollutants, leachate can bring pollution to the surface water and underground water. Due to the high cost of transportation, landfill sites are not usually chosen far from the downtown areas, which may make it possible to result in the landscape pollution. In order to prevent the secondary pollution to ambient environment brought about by landfill gases and leachate, corresponding measures such as landfill liner, leachate collection and treatment, gases recovery, etc, have been presented in this paper. The guiding inclination of the paper is to decrease the amount of pollution and reuse and recycle natural resources harmlessly to the environment. A special stress has been put on the discussion as to the choice of landfill sites and their construction as well as the landfilling operation. Seeing the sanitary refuse landfill is a strategically important project, effective preventing measures are to be taken in all links of the production chain including the site choice, design and construction.