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Method for deep biological denitrification and removal of COD of leachate

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

Active Publication Date: 2015-01-14
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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  • Method for deep biological denitrification and removal of COD of leachate
  • Method for deep biological denitrification and removal of COD of leachate
  • Method for deep biological denitrification and removal of COD of leachate

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Effect test

Embodiment 1

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

Embodiment 2

[0029] After pre-treatment, 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, 28ml of the hydrolysis and acidification liquid with a COD concentration of 80g / L of kitchen waste was added, and the ratio of COD to total nitrogen was 5.1. After 6 hours of treatment, the total nitrogen concentration was below 5 mg / L, and ammonia nitrogen and nitros nitrogen were not detected.

Embodiment 3

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

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Abstract

The invention relates to a method for deep biological denitrification and removal of COD of leachate. The method comprises the following steps: performing denitrification on the leachate by taking kitchen waste hydrolysis acidification liquid as an external carbon source to control the concentration of total nitrogen and the concentration of COD in outlet water, wherein the hydrolysis acidification liquid is specifically obtained by screening and deoiling kitchen wastes and performing anaerobic fermentation on the kitchen wastes in an anaerobic fermentation tank; putting the leachate of a waste landfill site after physical and chemical treatment, biochemical treatment and Fenton oxidation treatment in an SBR anoxic reaction tank, reducing the concentration of COD to below 100mg / L, and controlling the concentration of total nitrogen at 150-300mg / L; feeding the kitchen waste hydrolysis acidification liquid to control the ratio of COD in the acidification liquid to total nitrogen in the leachate at 5-8, uniformly mixing, and then performing denitrification; and finally performing sequencing batch treatment by using an SBR process, and controlling the reaction retention time at 6-12h. The concentration of total nitrogen in the leachate sewage after treatment according to the method provided by the invention is lower than 40mg / L, the concentration of COD is lower than 100mg / L, and the leachate achieves a national emission standard.

Description

Technical field [0001] The present invention belongs to the technical field of environmental protection, and particularly relates to a method for deep biological denitrification and COD removal of leachate. The method can be widely used in the subsequent advanced biological treatment of leachate, and makes the total nitrogen and COD index of leachate reach National emission standards. Background technique [0002] Nowadays, the treatment technology of leachate has been developed very mature, mainly divided into two kinds of physical and chemical treatment and biological treatment. However, the leachate containing high concentration of ammonia nitrogen is toxic to microorganisms and severely inhibits its activity. For this kind of leachate, it often goes through a series of ammonia nitrogen removal processes before entering the biological treatment, whether it is aeration or stripping. The stripping tower removes nitrogen and the ammonia nitrogen removal rate can reach 70% to 80%...

Claims

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Application Information

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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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