Landfill leachate discharge treatment device and treatment method

A landfill leachate and treatment device technology, which is applied in the direction of contaminated groundwater/leachate treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high operating costs, unstable operation of facilities, and large investment in evaporation systems, etc. problems, achieve stable operation, solve refractory humic acid and salt accumulation, and achieve low investment and operation costs

Pending Publication Date: 2019-09-10
北京首创环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the concentrated liquid is refilled into the landfill, pollutants will continue to accumulate over time, resulting in poor biodegradability of the leachate and high TDS concentration, which ultimately makes the original facility unable to operate stably; as for the evaporation process, due to the large amount of concentrated liquid, the evaporation system Large investment, high operating costs, economically unfeasible
[0004] Therefore, how to design a set of treatment devices and treatment methods with stable operation, acceptable investment and operation costs, and full discharge of leachate up to the standard to solve the problem of adverse effects of concentrate recharge on landfills and leachate systems is an important issue. Key issues to be solved urgently by field technicians

Method used

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  • Landfill leachate discharge treatment device and treatment method
  • Landfill leachate discharge treatment device and treatment method

Examples

Experimental program
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Effect test

Embodiment 2

[0044] Such as figure 2 As shown, a kind of treatment method that uses the treatment device of embodiment 1 provided in this specific embodiment to discharge landfill leachate, comprises the following steps:

[0045] Step S1: The leachate stays in the water quality balance pool 1 for two days, and methanol is added to the water quality balance pool 1 through the carbon source dosing device 10, and the COD of the leachate stock solution is measured every day Cr Concentration, calculate the amount of methanol that needs to be added to ensure the COD of the leachate after adjustment Cr :NH 4 + -N≈6.5:1, a submersible mixer is installed in the water quality balance pool 1 to fully mix the carbon source and raw water;

[0046] Step S2: The leachate in the water quality balance pool 1 enters the two-stage nitrification and denitrification pool 2 after the carbon-to-nitrogen ratio is adjusted, and in the first-stage denitrification pool, the first-stage nitrification pool, the se...

Embodiment 3

[0051] The leachate of a certain landfill is processed by the treatment method of the landfill leachate discharge of Embodiment 2, and the leachate water quality COD of the landfill is Cr , ammonia nitrogen, TN and SS concentrations are 8000-15000mg / L, 2000-3000mg / L, 2200-3200mg / L and 1000-1500mg / L respectively. 90mg / L, 25mg / L, 40mg / L and 30mg / L, there is no requirement for TDS and chloride ion concentration.

[0052] After the leachate of the landfill is treated by the treatment method of the landfill leachate discharge in Example 2, the COD of the produced water of the secondary nanofiltration device 5 Cr , ammonia nitrogen and TN reached 50-80mg / L, 0.1-5mg / L and 7-33mg / L respectively, and the COD of the produced water of the three-stage membrane concentrate unit Cr , ammonia nitrogen and TN are 65~90mg / L, 0.7~7mg / L and 16~34mg / L respectively, all of which meet the emission standards.

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Abstract

The invention discloses a landfill leachate discharge treatment device and treatment method. The treatment device comprises a water quality balance tank, a two-stage nitration and denitrification tank, an ultrafiltration device, a primary nano-filtration device, a secondary nano-filtration device and a water generation tank which sequentially communicate with one another, and further comprises a carbon source feeding device, wherein the carbon source feeding device communicates with the water quality balance tank and the two-stage nitration and denitrification tank respectively; the ultrafiltration device communicates with a sludge tank, a sludge dehydration device and a dehydration clean liquid tank in sequence; the dehydration clean liquid tank communicates with the two-stage nitration and denitrification tank; the primary nano-filtration device communicates with a multi-stage membrane concentrator; the multi-stage membrane concentrator communicates with an evaporation system and thewater generation tank; the evaporation system communicates with the secondary nano-filtration device and a curing / bagging device; and a concentrated liquid generated in the secondary nano-filtrationdevice flows back to the primary nano-filtration device. The treatment device and the treatment method aim at the requirement that an effluent is free of TDSs (total dissolved solids) or chloride ions, are capable of achieving full-dose up-to-standard emission of leachate, and have the characteristics of being stable in operation and low in investment and operation cost.

Description

technical field [0001] The invention relates to the technical field of landfill leachate treatment, in particular to a treatment device and method for landfill leachate discharge. Background technique [0002] Garbage leachate is high-concentration organic wastewater produced in solid waste treatment projects. Among them, domestic waste landfill leachate is the waste water that seeps out of the garbage dump in the landfill. It has high pollutant concentration and high water quality. Large fluctuations, high hardness, high alkalinity, etc., the concentration of pollutants has a lot to do with the operation time of the landfill, the way of landfill operation and the region. COD in common landfill leachate Cr , ammonia nitrogen, TN and SS concentrations are 3000-20000mg / L, 1000-2500mg / L, 1200-3000mg / L and 1000-2000mg / L respectively, and the pH value is generally alkaline. [0003] At present, the main effluent indicators of landfill leachate are in accordance with the "Standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/06
CPCC02F1/04C02F1/442C02F1/444C02F3/30C02F9/00C02F2103/06
Inventor 董健张爱军戴小东吴靖宇
Owner 北京首创环境科技有限公司
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