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Method for degrading ammonia nitrogen in high-salinity sewage by microbes

A technology for microbial degradation and high-salt sewage, which is applied in the field of microbial degradation of ammonia nitrogen in high-salt sewage, can solve the problems of reducing ammonia nitrogen and organic matter removal rate, increasing the concentration of suspended solids in effluent, and reducing the number and species of microorganisms. The effect of increasing the nitrification rate and shortening the nitrification time

Inactive Publication Date: 2013-08-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high-salt conditions, the system may reduce the number and types of microorganisms, increase the concentration of suspended solids in the effluent, and reduce the removal rate of ammonia nitrogen and organic matter, which will affect the treatment effect.

Method used

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  • Method for degrading ammonia nitrogen in high-salinity sewage by microbes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Biodegradation of ammonia nitrogen in high-salt wastewater from petroleum refineries

[0019] Establishment of ammonia nitrogen treatment process for biodegradable high-salt wastewater

[0020] The influent water is wastewater from a petroleum refinery, and the inoculated microorganisms in the anaerobic and aerobic biological reaction tanks are activated sludge, with a concentration of 5g / L, and the ratio of activated sludge and high-efficiency nitrifying bacteria in the secondary aerobic oxidation tank is 1:1.

[0021] The water of the domesticated sludge is the effluent of petroleum refinery, and the source of sludge is the sludge at the bottom of the sewage tank of the refinery, the sludge of the biochemical treatment tank of the sewage treatment station, and the mixed sewage of high-efficiency salt-tolerant bacterial strains (mainly Flavobacteriu Staphylococcus, etc.) mud. Sludge acclimatization is carried out intermittently, and the raw water is dilute...

Embodiment 2

[0025] Embodiment 2: printing and dyeing wastewater treatment

[0026] Take the wastewater from a printing and dyeing factory, the salinity is 5-6g / L, the ammonia nitrogen is 240mg / L, the COD 5 It is 1500mg / L. After diluting by 4 times, artificially supplement ammonia nitrogen to 200mg / L as influent.

[0027] Sludge domestication, screening of efficient nitrifying bacteria, and control of conditions are the same as in Example 1.

[0028] After stable operation, the residence time of the anaerobic treatment tank is 5 hours, the residence time of the primary aerobic tank is 3 hours, the residence time of the secondary aerobic tank is 3 hours, the effluent ammonia nitrogen is less than 10mg / L, and the COD 5 <50mg / L

Embodiment 3

[0029] Embodiment 3: Treatment of reverse osmosis effluent

[0030] The mixed wastewater of reverse osmosis effluent and membrane washing wastewater in a certain workshop. The conductance is 22.3ms / cm, COD 5 is 400mg / L, and the concentration of ammonia nitrogen is 230mg / L.

[0031] Sludge domestication, screening of efficient nitrifying bacteria, and control of conditions are the same as in Example 1.

[0032] After stable operation, the residence time of the anaerobic treatment tank is 3 hours, the residence time of the primary aerobic tank is 3 hours, the residence time of the secondary aerobic tank is 2.5 hours, the effluent ammonia nitrogen is less than 5mg / L, and the COD 5 <30mg / L.

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Abstract

The invention discloses a method for degrading ammonia nitrogen in high-salinity sewage by microbes, wherein a treatment system in the method comprises an anaerobic biochemical reaction tank, a first-stage aerobic biochemical pool and a second-stage aerobic biochemical pool. Firstly, the sewage and the recirculation water simultaneously flow into the anaerobic biochemical reaction tank to be treated by denitrification and hydrolysis reaction; then, the sewage orderly flows into the first-stage aerobic biochemical pool and the second-stage aerobic biochemical pool to be respectively treated by first-stage aerobic treatment and the second stage aerobic treatment; the active sludge in the first-stage aerobic biochemical pool is the domesticated salt-tolerant bacteria for performing first-stage nitration on the ammonia nitrogen, and besides the domesticated salt-tolerant bacteria, efficient nitrifying bacteria are also added into the second-stage aerobic biochemical pool for performing second-stage high-strength nitration on the ammonia nitrogen=, thus, the effluent ammonia nitrogen and the COD (Chemical Oxygen Demand) can reach the emission standard.

Description

Technical field: [0001] The invention relates to an industrial sewage treatment technology, in particular to a method for microorganisms to degrade ammonia nitrogen in high-salt sewage. Background technique: [0002] High salinity wastewater refers to the total salt (such as Na + 、K + , C1 - etc.) is at least 1% of wastewater, which is one of the wastewater that is difficult to treat at present. Under high-salt conditions, the system may reduce the number and types of microorganisms, increase the concentration of suspended solids in the effluent, and reduce the removal rate of ammonia nitrogen and organic matter, which will affect the treatment effect. The impact of high-salt conditions on biological wastewater treatment is not only manifested in the removal rate of organic matter, but also in the process of biological nitrification and denitrification. [0003] There are few studies on denitrification of wastewater under high salinity conditions, and it is in its infanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F3/34
Inventor 杨勇霍莹郑贝贝张莹张艳芳陈军
Owner CHINA NAT OFFSHORE OIL CORP
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