Common garbage leachate treatment methods and processes
Common leachate treatment method and process of the article: leachate is a black or a brown foul-smelling liquid with a leachate containing a large amount of organic and inorganic materials, including various refractory organics and metal ions. Due to the complex composition of garbage, one of the characteristics of landfill leachate water quality is that it contains high levels of pollutants and often contains biological toxicity. If it is discharged directly into the environment without treatment, it will cause serious environmental pollution. This article introduces the methods and procedures for the treatment of landfill leachate. 1. On-site treatment There are two ways of backwashing and independent sewage treatment station. Back-leaching is conducive to the operation of the wastewater treatment system, but it cannot completely eliminate the leachate and its pollution, and the circulation will also lead to the accumulation of ammonia nitrogen. The environmental sanitation, safety and design technology issues in the backwash process are all limiting factors. Independent treatment systems are necessary in large landfills far away from cities, but the complex changes in the water quality of landfill leachate and the imbalance of the nutrient element ratio (C;N:P:S) make it difficult to choose a treatment method. The sewage treatment station must be continuously adjusted and reconstructed as the pollution characteristics of the leachate changes, and the cost of infrastructure, operation and maintenance and technical transformation is relatively high. 2. Off-site treatment can save the construction and operation costs of independent sewage treatment facilities, reduce treatment costs, and the buffering, dilution and nutrient balance effects of municipal sewage on the leachate reduce the difficulty of its treatment. Landfills far away from the municipal sewage pipe network have a heavy burden of leachate transportation. Direct merger may cause shock load on the urban sewage treatment plant, which will affect its operation in severe cases. 3. The combined treatment inside and outside the site uses simple treatment facilities (such as hydrolysis conditioning tanks, sedimentation tanks, etc.) to pre-treat the leachate in the site, and then discharge it through pipelines into the sewage treatment facilities outside the site for combined treatment, resulting in investment and operating costs Under the condition of less average, a considerable part of the pollutants that have a greater impact on the subsequent biological treatment can be removed in the field, so as to buffer the pollution load of the leachate and make the next combined treatment run more smoothly.
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