Treatment system for household refuse leachate

A treatment system and technology for domestic waste, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc. Reasonable handling, etc.

Active Publication Date: 2016-05-18
安徽普朗膜技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic waste leachate is treated by the method of "biochemical + membrane concentration", but the analysis shows that the membrane concentration of the leachate can only reach 4-6 times when the above method is used, and the pass rate of the actual water production Not more than 85%. At the same time, the concentrated waste liquid after concentration cannot be processed again due to its large volume and high salt content. Usually, t

Method used

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  • Treatment system for household refuse leachate
  • Treatment system for household refuse leachate
  • Treatment system for household refuse leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Take the six batches of leachate after biochemical and ultrafiltration pretreatment, respectively pass through the first-level nanofiltration unit 20a and the second-level nanofiltration unit 20b for parallel nanofiltration treatment, and the results are shown in Table 1 below. It can be seen from Table 1 that the leachate can be concentrated to more than 60 times after the primary nanofiltration treatment, and the conductivity removal rate is as high as 77%.

[0016] Table 1 Primary nanofiltration treatment results

[0017]

[0018]

Embodiment 2

[0020] 1. Take the third batch of samples in Example 1 of 1000ml, and concentrate by vacuum evaporation and concentration after primary nanofiltration concentration of 60 times, and monitor the remaining amount and boiling point of the concentrate during the concentration process to determine that the concentrate is evaporating The multiples that can be concentrated in the device, the results are shown in Table 2 below, as can be seen from the table, the concentrated solution can be normally concentrated 3 times, when the remaining content of the concentrated solution is about 200ml, and the concentration of the concentrated solution reaches 5 times, the feed liquid The nature changed drastically.

[0021] Atmospheric pressure evaporation concentration data of the concentrate in table 2

[0022] serial number

Concentrate volume / mL

Concentration factor

Boiling point / ℃

Remark

1

～1000

1

103.0

2

～900

104.0 ...

Embodiment 3

[0031] The supernatant produced after the first-level nanofiltration concentration of each batch of samples in Example 1 was respectively passed through the second-level nanofiltration unit one 30a and the second-level nanofiltration unit 30b to carry out the second-level nanofiltration treatment, and the first-level and second-level nanofiltration The supernatant liquid after stage nanofiltration was tested for COD value, and the results are shown in Table 5 below. It can be seen from the table that the COD value of the permeate after secondary nanofiltration is less than 100 mg / l, which meets the first-level discharge requirements stipulated in the national comprehensive sewage discharge standard.

[0032] Table 5 Supernatant COD detection of primary and secondary nanofiltration treatment

[0033]

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PUM

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Abstract

The present invention discloses a treatment system for household refuse leachate. The treatment system comprises a material tank, a first-stage nanofiltration unit, a second-stage nanofiltration unit and an evaporator, wherein a feed end of the first-stage nanofiltration unit is connected to an outlet of the material tank; a clear liquid outlet and a concentrated liquid outlet of the first-stage nanofiltration unit are respectively connected with a liquid inlet of the second-stage nanofiltration unit and a feed port of the evaporator; a permeate outlet and a concentrated liquid outlet of the second-stage nanofiltration unit are respectively led to an external drainage pipe network and the feed end of the first-stage nanofiltration unit; a concentrate outlet of the evaporator is led to an organic fertilizer or solidification treatment unit; and an evaporated liquor outlet of the evaporator is led to a liquid outlet of the second-stage nanofiltration unit. When the treatment system is used, the pretreated leachate is subjected to first-stage nanofiltration and evaporation concentration at first until the content of organic matters in the concentrate is as high as 50%, and then is used as an organic fertilizer or is subjected to solidification treatment, the clear solution after the first-stage nanofiltration is subjected to second-stage nanofiltration treatment, the concentrated liquid after second-stage nanofiltration is subjected to first-stage nanofiltration for cycle treatment, and the permeate after the second-stage nanofiltration is directly discharged.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a treatment system for leachate of domestic garbage. Background technique [0002] The so-called domestic waste leachate refers to the sewage seeped from the garbage in the urban domestic waste landfill. The large amount of domestic waste leachate is difficult to deal with, so it has been concerned by relevant departments in various countries as a social problem. At present, the domestic waste leachate is treated by the method of "biochemical + membrane concentration", but the analysis shows that the membrane concentration of the leachate can only reach 4-6 times when the above method is used, and the pass rate of the actual water production Not more than 85%. At the same time, the concentrated waste liquid after concentration cannot be processed again due to its large amount and high salt content. Usually, these concentrated liquids are returned to the garbage mountain...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/442C02F1/444C02F9/00C02F2301/043
Inventor 俞经福李松山俞能平何少仁汪光明张程平
Owner 安徽普朗膜技术有限公司
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