Activated bentonite and process for pretreating landfill leachate by activated bentonite adsorption method

Abstract

The invention relates to a process for pretreating a landfill leachate by an activated bentonite adsorption method. The process comprises the following steps: performing standing on a collected landfill leachate, carrying out filtering, then conveying the filtered landfill leachate into an adjusting pool, and adjusting the pH value of the filtered landfill leachate to 7-9; then conveying the landfill leachate with an adjusted pH value into a pretreatment pool; and adding activated bentonite into the pretreatment pool according to a proportion of 0.03 t of the activated bentonite in each cubicmeter of the landfill leachate, then carrying out stirring for 10 min at a speed of 200-300 r / min, after completion of stirring, carrying out standing for 60 min, then carrying out draining so as to obtain effluent of a landfill leachate pretreatment process, and conveying the effluent of the landfill leachate pretreatment process to a subsequent treatment procedure. The process provided by the invention can effectively remove COD, ammonia nitrogen and SS in a leachate, can remove 65% or more of chromaticity of the leachate and 80% or more of heavy metal pollutants, can use a pretreated leachate for regulating the water quantity and water quality of a stock solution, is simple in process flow, stable and reliable in operation and low in investment and treatment cost, reduces pressure for subsequent treatment of the leachate, reduces the cost of treatment and improves the efficiency of treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a process for pretreating domestic garbage leachate by an activated bentonite adsorption method. Background technique [0002] At present, the main methods of dealing with municipal solid waste include composting, landfill, incineration, pyrolysis, etc. Due to the characteristics of high inorganic components and low calorific value of urban solid waste in my country, sanitary landfill has become the current treatment city in China. Important way of trashing. During the collection, transfer, and landfill process of municipal solid waste, the pollutants contained in it will produce a kind of heavy metal content, dark color, high pollutant concentration and large variation range due to compaction, fermentation and precipitation seepage. The foul-smelling liquid with high content is called landfill leachate. The leachate produced after sanitary landfill ...

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Problems solved by technology

[0003] Due to the low biodegradability of landfill leachate, the COD discharge after biochemical treatment often cannot reach the standard. Although the follow-up treatment processes such as aeration, ultrafiltration, nitrification, and reverse osmosis can ensure that the COD discharge meets the standard, the process is complicated and the concentrated water is recycled. The problem of using is prominent, and the amount of biochemical sludge is large, and the equipment investment and treatment costs are relatively high

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