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Treatment method for leachate concentrated liquid in domestic waste landfill

A technology for domestic waste and a treatment method, which is applied to the treatment field of leachate concentrate in domestic waste landfills, can solve the problems of difficult biochemical pollutants, expensive equipment, collapse of the leachate biochemical treatment system, etc., so as to improve the degradation efficiency of pollutants. , reduce the waste of electric energy, improve the effect of biodegradability

Active Publication Date: 2020-01-17
桂润环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the technical means of concentrate treatment are recharge, evaporation, and incineration, the most common of which is recharge treatment, but recharge treatment will lead to the accumulation of difficult biochemical pollutants, salt, ammonia nitrogen, etc., which will lead to the collapse of the leachate biochemical treatment system ; However, the cost of evaporation, crystallization and incineration is high, and the resource utilization of its crystalline salt is difficult, the equipment is expensive, and it is easily corroded and scaled, and there is a high risk of secondary pollution

Method used

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  • Treatment method for leachate concentrated liquid in domestic waste landfill
  • Treatment method for leachate concentrated liquid in domestic waste landfill
  • Treatment method for leachate concentrated liquid in domestic waste landfill

Examples

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Embodiment 1

[0047] A landfill leachate (10 tons / day), after figure 1 After the shown process is processed (influent water rate 20 tons / day), obtain the NF concentrate that NF system handles and produce, the water quality of NF concentrate is as shown in table 1:

[0048] Table 1 Water quality of landfill leachate NF concentrate

[0049]

[0050] The NF concentrate is processed, the steps are as follows:

[0051] 1) Add polyaluminum chloride to the above NF concentrate: 0.5kg / m 3 , and polyacrylamide: 0.05kg / m 3 , to carry out coagulation and precipitation to obtain the first-stage supernatant;

[0052] 2) Add FeSO to the first stage clear liquid 4 ·7H 2 O and H 2 o 2 , FeSO 4 ·7H 2 O dosage is 5kg / m 3 , H 2 o 2 The dosage is 2.5L / m 3 , carry out the first-stage catalytic oxidation reaction, the pH of the first-stage catalytic oxidation reaction should be controlled at about 3 to 3.5, and the hydraulic retention time is 60 minutes; after the reaction, add the pH regulator N...

Embodiment 2

[0062] Leachate (10 tons / day) of a late domestic waste landfill, after figure 1 After the treatment shown in the process (influent water volume 10 tons / day), the RO / DTRO concentrate produced by the RO / DTRO system is obtained, and the water quality of the RO / DTRO concentrate is shown in Table 3:

[0063] Table 3 Water quality of landfill leachate RO / DTRO concentrate

[0064]

[0065]

[0066] To process the RO / DTRO concentrate, the steps are as follows:

[0067] 1) Add polyaluminum chloride to the above RO / DTRO concentrate: 1kg / m3 , and polyacrylamide: 0.05kg / m 3 , to carry out coagulation and precipitation to obtain the first-stage clear liquid;

[0068] 2) Add FeSO to the first stage supernatant 4 ·7H 2 O and H 2 o 2 , FeSO 4 ·7H 2 O dosage is 3kg / m 3 、H 2 o 2 The dosage is 2L / m 3 , carry out the first-stage catalytic oxidation reaction, the pH of the first-stage catalytic oxidation reaction should be controlled at about 3 to 3.5, and the hydraulic retention...

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Abstract

The invention relates to the technical field of wastewater treatment, and provides a treatment method for a leachate concentrated liquid in a domestic waste landfill. The method includes the followingsteps: adding a coagulant and a coagulant aid into the leachate concentrated liquid in the domestic waste landfill, and performing coagulating sedimentation to obtain a first-stage clear solution; adding an oxidant and a catalyst, and performing a first-stage catalytic oxidation reaction; adjusting the pH value of the obtained first-stage catalytic oxidation reaction solution to 7.5-8.5, and performing coagulating sedimentation to obtain a second-stage clear liquid; allowing the second-stage clear liquid to enter an ultrasonic catalytic oxidation filler tank, and performing a second-stage catalytic oxidation reaction; performing biochemical treatment on the obtained second-stage catalytic oxidation reaction solution to obtain biochemical produced water; and allowing part of the biochemical produced water to return to the ultrasonic catalytic oxidation filler tank, and performing electrocatalytic oxidation treatment on the rest of the produced water. The method can effectively remove pollutants in the leachate concentrated liquid in the domestic waste landfill, has low costs, and does not produce secondary pollution, and the effluent water indicators meet discharge standards.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment method for leachate concentrate of domestic garbage landfill. Background technique [0002] At present, for the treatment of leachate from municipal solid waste landfills, the mainstream process is: "multi-stage anaerobic / aerobic biochemical treatment + MBR + NF + RO / DTRO", the core of which is "NF + RO / DTRO". The wide application of "membrane" technology has led to a large amount of concentrated liquid, which accounts for more than 30% of the treatment capacity, and almost enriches most of the refractory organic matter, salt, heavy metals and other pollutants in the leachate. [0003] At present, the technical means of concentrate treatment are recharge, evaporation, and incineration, the most common of which is recharge treatment, but recharge treatment will lead to the accumulation of difficult biochemical pollutants, salt, ammonia nitrogen, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/06
CPCC02F9/00C02F1/56C02F1/725C02F1/66C02F3/30C02F1/4672C02F2103/06C02F2209/08
Inventor 李航杨芳显魏江州康坤陈兴江李俊寰罗汉富苏洪利
Owner 桂润环境科技股份有限公司