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 stability, enhancing flocculation and improving enzyme activity

Active Publication Date: 2018-11-06
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

Experimental program
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Effect test

Embodiment 1

[0025] The preparation of embodiment 1 microbial growth promoter

[0026] The preparation method of the microbial growth promoter of the present invention is: (1) prepare the metal salt solution according to the following composition and parts by weight: the metal salt is 40 to 100 parts by weight, preferably 50 to 80 parts by weight, and the metal salt is Calcium salt, ferrous salt and copper salt, Ca in metal salt 2+ , Fe 2+ and Cu 2+ The molar configuration ratio is (5~15):(1~8):(0.5~5), preferably (8~12):(2~6):(1~4); (2) mix 5 ~30 parts by weight, preferably 10~20 parts by weight of polyamines are added to the metal salt solution. Furthermore, before use, the inorganic acid hydroxylamine can also be added in an amount of 0.5-15 parts by weight, preferably 2-10 parts by weight.

[0027] Four types of microbial growth promoters were prepared according to the ratio and formula of the promoters in Table 1 by the above-mentioned method, and the concentrations of the promote...

Embodiment 2

[0030] The preparation of embodiment 2 denitrification bacteria agent

[0031] The microbial bacterial agent used in the method of the present invention comprises five 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

[0032] Example 3 Wastewater Treatment Results

[0033] The waste water generated during the hydrogen production process of Texaco's coal-water slurry gasification technology in an enterprise is treated by four sets of SBRs operating alternately. 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, and on the other hand, the salt content is high.

[0034] By adopting the method of the present invention, the growth accelerator prepared in Example 1 is added according to the concentration of the accelerator in the sewage treatment system at 20 to 30 mg / L each time the water is ingested, and at the same time...

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Abstract

The present invention discloses a deep denitrification treatment method for wastewater produced during a coal water slurry gasification process. The deep denitrification treatment method comprises that (1) a gas dissolving and floating system is additionally arranged on the front end of a SBR process; (2) during the starting, a microorganism growth promoting agent is supplemented to a SBR sewage treatment system, wherein the growth promoting agent comprises 40-100 parts by weight of metal salts and 5-30 parts by weight of a polyamine substance, preferably 50-80 parts by weight of metal salts and 10-20 parts by weight of a polyamine substance, the metal salts are a calcium salt, a ferrous salt and a copper salt, and a molar ratio of Ca<2+> to Fe<2+> to Cu<2+> is (5-15):(1-8):(0.5-5), preferably (8-12):(2-6):(1-4); and (3) every 3-5 SBR operating cycles, a denitrification bacterial agent is poured into the system, and the pouring is stopped until the ammonia nitrogen in the effluent is less than 50 mg / L and the total nitrogen is less than 50 mg / L. According to the present invention, the gas dissolving and floating system is arranged in front of the SBR process, and the microorganism growth promoting agent pouring and denitrification bacterial agent pouring combined method is used to perform the deep treatment on the nitrogen-containing pollutants in the wastewater, such that the effluent meets the wastewater reuse requirements.

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): C02F9/14C02F3/34
Inventor 高会杰郭志华孙丹凤赵胜楠
Owner CHINA PETROLEUM & CHEM CORP
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