Municipal solid waste landfill waste leachate treatment device and method
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A technology for landfill leachate and domestic waste, which is applied in the field of leachate treatment devices in domestic waste landfills. It can solve the problems of good effect, difficult treatment of high-salt concentrated liquid, and high cost of dosing chemicals.
Active Publication Date: 2018-12-25
桂润环境科技股份有限公司
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Problems solved by technology
All landfill leachate treatment plants designed for reverse osmosis have a problem: the high-salt concentrate produced by reverse osmosis is difficult to treat
Chemical oxidation methods such as Fenton method, Fenton-like method, potassium ferrate oxidation and other methods have disadvantages such as high cost of dosing chemicals, high requirements for reaction process control, and large sludge output; ultrasonic / ultraviolet assisted catalytic oxidation methods have equipment maintenance Disadvantages such as high cost, high requirements on water quality and reaction conditions, and unstable treatment effect; the electrocatalytic oxidation process has high oxidation efficiency, good effect, and small secondary pollution, so it has a broad prospect for landfill leachate treatment
At present, electrocatalytic oxidation technology is mainly used for biochemical pretreatment of landfill leachate, intermediate treatment, or simple terminal treatment. The cost of water and electricity per ton is as high as tens of degrees, and the investment per ton of water is nearly 10,000 yuan. It is difficult to apply in large-scale engineering
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Embodiment 1
[0084] Leachate from a landfill (10 tons / day)
[0085] Processing devices such as figure 1 Shown:
[0086] Water intake: 10 tons / day;
[0087] The water quality of landfill leachate influent is shown in Table 1.
[0088] Table 1 Landfill leachate influent water quality
[0089]
[0090] The processing steps are as follows:
[0091] Garbage percolation passes through the grid / grid (1) to remove debris over 2mm and returns to the collection pool (2). After the above steps, the landfill leachate first enters the first-level anoxic pool (3), which is the same as the second-level The nitrifying liquid returned from the anoxic tank (5) is pre-denitrified by using the carbon source in the water (5-2), and then enters the aerobic tank (4) for further carbonization and nitrification, and then enters the secondary anoxic The pool (5) carries out endogenous denitrification, and the 200% mixed solution (R2) flows back to the primary anoxic pool (3) for pre-denitrification; the den...
Embodiment 2
[0116] Leachate from a landfill (10 tons / day)
[0117] Processing devices such as figure 2 Shown:
[0118] Water intake: 10 tons / day;
[0119] The water quality of landfill leachate influent is shown in Table 3.
[0120] Table 3 Landfill leachate influent water quality
[0121]
[0122] The processing steps are as follows:
[0123] The landfill leachate passes through the grid / grid (1) to remove impurities larger than 2mm and then enters the collection tank (2), and most of the waste water (F6, 80%) undergoes anaerobic reaction in the anaerobic reaction tank (19) to remove large Part of the organic matter and a small part of waste water (F5, 20%) directly enter the primary anoxic pool (3), and the nitrifying liquid returned by the mixed liquid return pump (8) in the secondary anoxic pool (5) utilizes the carbon in the incoming water source for pre-denitrification, then enters the aerobic tank (4) for further carbonization and nitrification, then enters the secondary a...
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Abstract
The invention provides a municipal solid waste landfill waste leachate treatment device, and belongs to the field of wastewater treatment. A system is high in internal circulation ratio and strong inimpact load resistance, an external carbon source is omitted, organic matters in waste leachate are preferentially used for nitrogen removal by pre-denitrification, electrocatalytic oxidation nitrogenremoval serves as supplement and gate-keeping, and the total nitrogen removal rate of the system can meet emission standards. Total nitrogen is removed by electrocatalytic oxidation, and total nitrogen removal cost is lower than that of nitrogen removal by adding the carbon source. The system does not generate high-salinity concentrated liquor, and investment and operation of high-cost high-salinity concentrated liquor treatment equipment are omitted. A screening system with a low ion rejection rate is selected, screened high-concentration wastewater and low-concentration wastewater are subjected to electrocatalytic oxidation, the salt content of the system can be controlled, the influence of inorganic salt over-accumulation on biochemical treatment efficiency is avoided, the device is suitable for industrial application, and final discharge outlet water quality is superior to municipal solid waste landfill pollution control standards (GB 16889-2008).
Description
technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment device and method for landfill leachate of domestic garbage. Background technique [0002] During the process of domestic waste landfilling and for a long period of time after the site is closed, landfill leachate containing high concentrations of organic matter, ammonia nitrogen, and heavy metals will be produced. Landfill leachate has complex components and low biodegradability, resulting in landfill seepage. The filtrate treatment is difficult, the treatment process is complex, the investment and construction costs are high, and the operating costs are high. [0003] At present, landfill leachate treatment technology mainly adopts biochemical treatment, membrane separation, advanced oxidation technology and its combination technology. Biochemical treatment mainly includes anaerobic and aerobic treatment process combination; membrane separation technology ...
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