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A deep denitrification treatment method for wastewater generated during coal-water slurry gasification

A technology of deep denitrification and treatment method, applied in water/sewage multi-stage treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. The effect of nitrification and denitrification, improving processing capacity and ensuring stable operation

Active Publication Date: 2020-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After being treated by the invention, the ammonia nitrogen of coal-water slurry gasification wastewater can be controlled below 15mg / L, the COD can be controlled below 100mg / L, and the index of COD (concentration lower than 60mg / L) can be reused from sewage as circulating water replenishment There is still a certain distance, that is to say, the COD concentration in the wastewater treated by the invention patent cannot meet the requirements of wastewater reuse, and further treatment is required before reuse can be considered

Method used

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  • A deep denitrification treatment method for wastewater generated during coal-water slurry gasification
  • A deep denitrification treatment method for wastewater generated during coal-water slurry gasification

Examples

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Embodiment 1

[0024] The preparation of embodiment 1 microbial growth promoter

[0025] The microbial growth promoter used in the present invention is prepared according to the methods described in CN201410585483.6, CN201410585481.7 and CN201410585655.X, preferably by the method described in CN201410585655.X. First prepare the metal salt solution according to the ratio and formula of the microbial growth promoter in Table 1. Before use, polyamines, organic acid hydroxylamine and Na 2 SO 3 Added into the metal salt solution to prepare microorganism growth promoters I-III, the concentrations of the promoters are all 0.5g / L.

[0026] Table 1 The formula and ratio of microbial growth promoter

[0027]

Embodiment 2

[0028] The preparation of embodiment 2 denitrification bacteria agent

[0029] The denitrification bacteria agent used in the method of the present invention comprises five bacterial strains of Coxella palustris FSDN-A, Arthrobacter FDN-1, Flavobacterium waterii FDN-2, Paracoccus denitrificans DN-3 and Methylobacterium SDN-3 , the microbial bacterial agent used is prepared according to the method described in Example 1 of CN201210130645.8, and finally obtained the bacterial suspension A (the volume ratio of five bacterial strains is 1:1:1:1:1) harvested according to different proportions ) and bacterial suspension B (the volume ratio of the five strains is 1:1:2:1.5:3).

Embodiment 3

[0030] The treatment result of embodiment 3 waste water

[0031] The waste water generated during the hydrogen production process of Texaco coal-water slurry gasification technology in an enterprise is treated by the process of five sets of SBR alternate operation. The ammonia nitrogen concentration in the influent water is 300mg / L, the COD is 450mg / L, and the total salt content is 2000-2800mg / L. After the original SBR process, the ammonia nitrogen concentration in the effluent water is about 50mg / L, the COD is less than 50mg / L, The nitrogen concentration is about 200mg / L, and the total salt content is about 3200mg / L. On the one hand, the effluent ammonia nitrogen cannot meet the standard, on the other hand, the salt content is high, and the treatment cost per ton of water is 0.8 yuan.

[0032] The specific process is as follows: (1) A dissolved air flotation system is added at the front end of the SBR process, and the working pressure of the dissolved air flotation is control...

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Abstract

The present invention relates to a deep denitrogenation treatment method for wastewater produced during a coal water slurry gasification process. The deep denitrogenation treatment method comprises: (1) additionally arranging a gas dissolving air flotation system on the front end of a SBR process; (2) during starting, adding a microorganism growth accelerator to a SBR sewage treatment system in a supplementing manner, wherein the microorganism growth accelerator comprises a metal salt, a polyamine substance, an organic acid hydroxylamine and Na2SO3, and the metal salt comprises a calcium salt, a copper salt, a magnesium salt and / or a ferrous salt; and (3) pouring a denitrogenation bacterial agent to the SBR system every 3-5 SBR operation period, and stopping the pouring until the ammonia nitrogen concentration in the effluent is lower than 50 mg / L and the total nitrogen concentration is lower than 50 mg / L. According to the present invention, by arranging the gas dissolving air flotation system before the SBR process and by combining the pouring of the microorganism growth accelerator into the SBR and the pouring of the denitrogenation bacterial agent into the SBR, the nitrogen-containing pollutant in the wastewater is subjected to deep treatment through the short-range nitrification and denitrification process, wherein the effluent meets the sewage reuse requirement.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment in environmental engineering, and relates to a waste water denitrification treatment method, in particular to a deep denitrification treatment method for waste water produced in the coal-water slurry gasification process. Background technique [0002] Coal gasification is a basic technology of coal energy conversion and an important link in the clean utilization of coal. Among them, Texaco coal-water slurry pressurized gasification technology has been widely used because of its simple process, less environmental pollution, and strong adaptability to coal types. The wastewater produced by the coal-water slurry gasification process does not contain tar and heavy metal ions, the content of cyanide and phenols is low, and the formic acid compound is the main pollutant that constitutes the COD of the wastewater, so the biodegradability of the wastewater is good. At present, most of the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/34C02F101/16
Inventor 高会杰赵胜楠孙丹凤
Owner CHINA PETROLEUM & CHEM CORP
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