A method for deep biological denitrification and COD removal of leachate

A technology of biological denitrification and leachate, which is applied in the field of deep biological denitrification and COD removal of leachate, can solve the problems of inability to guarantee water effluent and low price.

Active Publication Date: 2016-08-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most widely used external carbon source is methanol, but it is toxic and not cheap, and there will still be a certain concentration of COD after denitrification treatment, which cannot guarantee its effluent

Method used

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  • A method for deep biological denitrification and COD removal of leachate
  • A method for deep biological denitrification and COD removal of leachate
  • A method for deep biological denitrification and COD removal of leachate

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Experimental program
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Effect test

Embodiment 1

[0027] After pretreatment, the total nitrogen concentration of the leachate is about 160mg / L, most of which are nitrates, and the COD concentration is low. In the SBR reactor with an effective volume of 3L, add 35ml COD concentration of 80g / L food waste hydrolysis acidification solution, and the ratio of COD to total nitrogen is 5.8. After 12 hours of treatment, the total nitrogen concentration was below 15 mg / L, and ammonia nitrogen and nitrite nitrogen were not detected. COD effluent was 79.2mg / L.

Embodiment 2

[0029] After pretreatment, the total nitrogen concentration of the leachate is about 145mg / L, most of which are nitrates, and the COD concentration is low. In the SBR reactor with an effective volume of 3L, add 28ml of food waste hydrolysis and acidification solution with a COD concentration of 80g / L, and the ratio of COD to total nitrogen is 5.1. After 6 hours of treatment, the total nitrogen concentration was below 5mg / L, and ammonia nitrogen and nitrite nitrogen were not detected.

Embodiment 3

[0031] After pretreatment, the total nitrogen concentration of the leachate is 145mg / L, most of which are nitrates, and the COD concentration is low. In the SBR reactor with an effective volume of 3L, add 38ml of food waste hydrolysis and acidification solution with a COD concentration of 80g / L, and the ratio of COD to total nitrogen is 7. After 12 hours of treatment, the total nitrogen concentration was below 15mg / L.

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Abstract

A method for in-depth biological denitrification and COD removal of leachate, which utilizes kitchen waste hydrolyzed and acidified liquid as an external carbon source to denitrify the leachate, and controls the total nitrogen and COD concentration of its effluent. Specifically, the kitchen waste is screened, removed Oil, anaerobic fermentation in anaerobic fermentation tank to obtain hydrolyzed acidified liquid; the landfill leachate after physicochemical treatment, biochemical treatment and Fenton oxidation treatment was placed in SBR anoxic reaction tank, and its COD concentration dropped to Below 100mg / L, the total nitrogen concentration is 150-300mg / L; add kitchen waste hydrolysis acidification solution, control the ratio of COD in acidification solution to total nitrogen in leachate to be 5-8, and carry out denitrification after mixing evenly; The SBR process carries out sequencing batch treatment, and the reaction residence time is controlled to be 6 to 12 hours. The total nitrogen concentration of the leachate sewage treated by the present invention is lower than 40 mg / L, and the COD concentration is lower than 100 mg / L, which meets the national discharge standard.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and particularly relates to a method for deep biological denitrification and COD removal of leachate, which can be widely used for subsequent deep biological treatment of leachate, and makes the total nitrogen and COD indicators of leachate reach National emission standards. Background technique [0002] Nowadays, leachate treatment technology has been developed very maturely, mainly divided into physical and chemical treatment and biological treatment. However, the leachate containing high concentration of ammonia nitrogen is toxic to microorganisms and seriously inhibits its activity. For this leachate, it often needs to go through a series of ammonia nitrogen removal processes before entering biological treatment. The stripping tower denitrifies, and the removal rate of ammonia nitrogen can reach 70% to 80%. After the pretreatment leachate is treated in the biochemical depar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/28B09B3/00
CPCC02F9/00B09B3/00C02F2103/06C02F3/28C02F3/282C02F1/40B09B2101/00
Inventor 蒋建国张昊巍
Owner TSINGHUA UNIV
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