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Source: 21st Century Business Herald
Beijing Fire Protection Notice, on the morning of December 26, the students of the Department of Municipal Environmental Engineering of Beijing Jiaotong University were in the environmental engineering laboratory of Building 2 of the East Campus of the school. During the scientific research experiment on landfill leachate wastewater treatment, an explosion occurred at the experimental site, resulting in three participants in the accident. The student died in the experiment. At 10:20, the fire was under control.
Landfill leachate is simply dirty water in the garbage. According to the paper “Research and Application Status of Landfill Leachate Treatment Process†published by Wang Kai and others this year in the Journal of Beijing University of Technology, landfill leachate will be produced during landfill and after landfill completion. The source is mainly the water content of the garbage itself and the precipitation and snowfall of the atmosphere.
In addition, it is understood that leachate will also be produced in waste incineration plants. In this year's Central Environmental Protection Inspector's "Looking Back", the inspector team found that there were phenomena such as leachate smuggling municipal sewage pipe network and direct drainage of Poyang Lake in Henan and Jiangxi.
Landfill leachate is a black or yellowish brown liquid with a foul odor. At present, China's landfill leachate production has reached more than 30 million tons per year.
Because the composition of waste is very complicated, the resulting landfill leachate is a special wastewater with complex composition, high organic matter, high ammonia nitrogen and high salinity. One of the characteristics of water quality is that the pollutant content is high and often contains biological toxicity.
According to estimates, one ton of leachate is equivalent to the concentration of pollutants contained in 100 tons of municipal sewage. Leachate, if discharged directly, can cause irreversible damage to the surrounding environment, especially groundwater.
Workers in the waste treatment industry said: "Because leachate is relatively stinky, so the treatment process, especially the transportation process, or in the laboratory research, must also be done in a relatively closed environment. If the ventilation is not smooth, The frequency is not high, it is easy to cause the rapid accumulation of flammable gas in a short time, and the concentration reaches the dangerous limit. If there is a slight Mars, it may cause a blasting accident. Leachate, because of the high concentration of pollutants, COD (chemical oxygen demand) It is often tens of thousands, but also high in salt and pungent odor. It is the most difficult and cost-effective type in the field of sewage. So leachate treatment has always been a headache for the waste treatment industry."
The main difficulties in the treatment of landfill leachate in China are 4 points: high organic matter content, and contains a large amount of toxic and macromolecular organic matter. It can not achieve the standard discharge by a single physicochemical or biochemical process, and must be treated by a combination of physicochemical and biochemical processes. How to choose a reasonable, economical and effective combination process is the first problem facing the landfill leachate treatment workers.
Landfill leachate generally has a high ammonia nitrogen content, which is difficult to achieve effective and complete nitrogen removal. As the country has increased the discharge standard for leachate total nitrogen, this puts higher demands on the treatment of leachate. The traditional treatment process, especially the core biological treatment process, is generally effective in removing ammonia nitrogen from the leachate, but the removal of total nitrogen is not ideal. How to improve the total nitrogen removal rate of biological treatment process is the second problem facing the landfill leachate treatment workers.
The huge changes in water quality and water have increased the difficulty of achieving stable emissions. The water quality and quantity of leachate in different ages in different seasons are very different, which brings challenges to the selection and operation of the treatment process. Under the established combined process, how to give full play to the maximum processing capacity of the existing process and ensure stable operation is the third problem faced by the landfill leachate treatment workers.
Due to the complicated treatment process and high processing cost, in order to achieve the standard discharge, in addition to the combined process, the membrane treatment process based on nanofiltration or reverse osmosis is often used as the final advanced treatment, resulting in leachate. Processing costs have remained high for a long time. How to reduce the treatment cost of leachate under the premise of ensuring the treatment effect is the fourth problem faced by the landfill leachate treatment workers.
On August 10, 2017, the Second Intermediate People's Court of Beijing announced a case of stealing landfill leachate. From 2012 to 2015, the defendant Ma Mougang and a company in Tianjin and Lu Mou and Li Mou (both handled separately) violated state regulations and dumped the landfill leachate that was transported from the garbage dump into a municipality in Beijing. In the sewage well, the company illegally earned more than 50 million. The stolen landfill leachate enters the municipal sewage pipe network and enters the reclaimed water plant, so that the reclaimed water plant bears an additional sewage treatment cost of more than 930,000.
Beijing No. 2 Intermediate People's Court sentenced Ma to 17 years in prison for accepting bribes and polluting the environment, and imposed a fine of 1.9 million yuan. He was sentenced to a profit of 61 million in a trade company in Tianjin for the crime of bribery and environmental pollution. He was sentenced to 300,000 fines in prison for the crime of environmental pollution. He was sentenced to 2 years in prison and sentenced to 300,000 fines. Zhang was sentenced to 1 year and 8 months and sentenced to 100,000 fines.
Editor in charge: Miao Rong
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