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A sewage treatment process that efficiently utilizes carbon sources in sludge

A technology of sewage treatment and sewage treatment system, which is applied in the field of sewage treatment technology that efficiently utilizes carbon sources in sludge, can solve problems such as increasing sewage treatment costs, achieve the goals of improving comprehensive utilization, system stability, and reducing nitrogen content in effluent Effect

Active Publication Date: 2018-10-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of these substances will undoubtedly increase the cost of sewage treatment

Method used

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  • A sewage treatment process that efficiently utilizes carbon sources in sludge

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Effect test

Embodiment 1

[0026] Example 1: The effluent from the primary sedimentation tank of a sewage treatment plant in Shanghai is used as the influent, and the influent volume is A 2 / O bioreactor, HRT is 8h, SRT is 3d, for sewage treatment, the effluent enters the sedimentation tank for mud-water separation.

[0027] (1) The denitrification sludge that has been operated for a long time with acetic acid as the substrate is used as the inoculation sludge, and the methane anaerobic oxidation tank is started under anoxic conditions. During the operation, methane gas is continuously introduced into the reactor. After 6 months of running, NO in the reactor 3 - -N removal rate up to 295 mgL -1 d -1 , and maintained a good stability; the remaining ammonia nitrogen in the effluent of the sedimentation tank enters the methane anaerobic oxidation tank in stable operation, and uses the methane generated by the anaerobic digestion of the sludge for deep denitrification;

[0028] (2) Add 1:1 (VS:VS) inocu...

Embodiment 2

[0033] (1) Take the effluent from the primary sedimentation tank of a sewage treatment plant in Shanghai as the influent, and the influent volume is A 2 / O bioreactor, HRT is 8 hours, SRT is 3 days, for sewage treatment, the effluent enters the sedimentation tank for mud-water separation;

[0034] (2) The denitrification sludge that has been operated for a long time with acetic acid as the substrate is used as the inoculation sludge, and the methane anaerobic oxidation tank is started under anoxic conditions, and methane gas is continuously introduced into the reactor during operation. running, NO in the reactor 3 - -N removal rate up to 289 mgL -1 d -1 , and maintained a good stability; the remaining ammonia nitrogen in the effluent of the sedimentation tank enters the methane anaerobic oxidation tank in stable operation, and uses the methane generated by the anaerobic digestion of the sludge for deep denitrification;

[0035] (3) Add 1:1 (VS:VS) inoculum sludge and raw s...

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Abstract

The invention belongs to the field of sewage treatment and solid waste recycling, and discloses a sewage treatment process for efficiently utilizing a carbon source in sludge. According to the sewage treatment process for efficiently utilizing the carbon source in the sludge, biogas slurry back-flowing is performed after high-solid-content sludge is subjected to anaerobic digestion, the ammonium nitrogen concentration of a system is regulated and controlled to promote the conversion of an acetic acid utilization type methanogen system to a hydrogen utilization type methanogen system; a CO2 / H2 methane production approach is sufficiently utilized; an organic carbon source which is represented by short-chain fatty acid (acetic acid and the like) is saved. Meanwhile, ammonia nitrogen stripping is carried out on the biogas slurry by utilizing marsh gas produced by an anaerobic digestion system; the ammonium nitrogen concentration in the biogas slurry is decreased; the purification of the marsh gas is realized; an ammonia gas is absorbed by water or an acid solvent, and is recovered in the form of ammonium chloride or ammonium sulfate. The biogas slurry with rich the short-chain fatty acid after the ammonia nitrogen stripping is back-flowed to a sewage treatment system, thereby supplementing a carbon source at a denitrification stage and promoting denitrogenation and dephosphorization. No2<-> / No3<-> remained in outlet water in a sedimentation tank enter a stably running methane anaerobic oxidation reaction tank; methane produced in an anaerobic digestion procedure of the slurry is used as a carbon source to realize advanced denitrogenation.

Description

technical field [0001] The invention belongs to the field of sewage treatment and solid waste recycling, and reflows the biogas slurry produced in the process of high-solid anaerobic digestion of sludge to reasonably regulate the concentration of ammonia nitrogen in the system and make full use of CO 2 / H 2 The way to produce methane, reduce carbon emissions, and at the same time, directly apply the saved organic carbon sources represented by short-chain fatty acids (acetic acid, etc.) A sewage treatment process that efficiently utilizes carbon sources in sludge. Background technique [0002] Carbon-neutral operation in sewage treatment is a technical requirement to achieve energy self-sufficiency in the entire sewage treatment process, and is the core content of future sewage treatment. Europe, the United States and even some surrounding Asian countries have successively promulgated roadmaps for the carbon-neutral operation of sewage treatment in the 21st century and put ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/04
CPCC02F3/28C02F3/301C02F9/00C02F11/04C02F2001/007C02F2301/043C02F2305/06Y02E50/30
Inventor 戴晓虎李宁于春晓戴翎翎董滨
Owner TONGJI UNIV
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