Denitrification and COD removal treatment process for high-calcium and high-salt sewage

A high-salt sewage and treatment process technology, applied in water/sewage treatment, biological water/sewage treatment, water/sewage treatment equipment, etc., can solve the problem of affecting the normal function of microorganisms, long activated sludge cycle, biofilm loss, etc. problems, to avoid system fouling, improve COD removal rate, and shorten the cycle

Inactive Publication Date: 2019-02-26
CHINA PETROLEUM & CHEM CORP
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of water treatment, salt concentration and salt shock will inhibit the growth of nitrifying bacteria, thereby affecting the progress of denitrification reaction; high calcium content is prone to scaling, affecting the normal function of microorganisms, or causing damage or paralysis of equipment
[0003] Studies have shown that by selecting appropriate sludge inoculants and domesticating sludge under appropriate conditions, microorganisms with good salt tolerance can be obtained, thereby improving the denitrification effect of high-salt sewage; river sediments in high-salt environments are commonly used active Biomechanical inoculant, but this inoculant has a longer period of acclimation to activated sludge
[0004] In the prior art, anaerobic + composite biofilm technology is used to treat high-concentration inorganic salt ammonia nitrogen wastewater, but for sewage with high calcium content, high-concentration calcium ions in the water will form calcium carbonate scale and deposit on the filler, destroying the biofilm and causing biological membrane failure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Denitrification and COD removal treatment process for high-calcium and high-salt sewage
  • Denitrification and COD removal treatment process for high-calcium and high-salt sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]High-calcium and high-salt sewage influent indicators: total nitrogen 200mg / L, ammonia nitrogen 20mg / L, COD 150mg / L, conductivity 35000μs / cm, calcium content 4000mg / L.

[0037] Sludge domestication process: The activated sludge from the petrochemical sewage treatment plant was selected as the inoculum for sludge domestication, and the domestication period was 30 days.

[0038] 1) Influent, high-calcium and high-salt sewage, acetic acid and inorganic acid are mixed evenly through the pipeline mixer and then enter the denitrification tank. Among them, the concentration of acetic acid is 500 mg / L, and the concentration of sulfuric acid is 40 mg / L;

[0039] 2) Denitrification, the hydraulic retention time of the denitrification tank is 20 hours, the dissolved oxygen concentration is 0.5mg / L, the sludge concentration is 4000mg / L, and the pH is 6.5-7.5. The denitrification bacteria that have been acclimated by the sludge are under the action of the carbon source Carry out deni...

Embodiment 2

[0045] High-calcium and high-salt sewage influent indicators: total nitrogen 100mg / L, ammonia nitrogen 10mg / L, COD 100mg / L, conductivity 25000μs / cm, calcium content 2000mg / L.

[0046] Sludge domestication process: The activated sludge from the petrochemical sewage treatment plant was selected as the inoculum for sludge domestication, and the domestication period was 25 days.

[0047] 1) Influent, high-calcium and high-salt sewage, acetic acid and inorganic acid are mixed evenly through the pipeline mixer and then enter the denitrification tank. Among them, the concentration of acetic acid is 350 mg / L, and the concentration of sulfuric acid is 60 mg / L;

[0048] 2) Denitrification, the hydraulic retention time of the denitrification tank is 15 hours, the dissolved oxygen concentration is 0.5mg / L, the sludge concentration is 4000mg / L, and the pH is 6.5-7.5. The denitrification bacteria that have been domesticated by the sludge are under the action of the carbon source Carry out d...

Embodiment 3

[0054] High-calcium and high-salt sewage influent indicators: total nitrogen 180mg / L, ammonia nitrogen 20mg / L, COD 150mg / L, conductivity 35000μs / cm, calcium content 4000mg / L.

[0055] Sludge domestication process: The activated sludge from the petrochemical sewage treatment plant was selected as the inoculum for sludge domestication, and the domestication period was 28 days.

[0056] 1) Influent, high-calcium and high-salt sewage, acetic acid and inorganic acid are mixed evenly through the pipeline mixer and then enter the denitrification tank. Among them, the dosing concentration of acetic acid is 800mg / L, and the dosing concentration of sulfuric acid is 50 mg / L;

[0057] 2) Denitrification, the hydraulic retention time of the denitrification tank is 20 hours, the dissolved oxygen concentration is 0.5mg / L, the sludge concentration is 4000mg / L, and the pH is 6.5-7.5. The denitrification bacteria that have been acclimated by the sludge are under the action of the carbon source ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a denitrification and COD removal treatment process for high-calcium and high-salt sewage, and belongs to the technical field of environmental protection. The denitrificationand COD removal treatment process mainly comprises that high-calcium and high-salt sewage, a carbon source and an inorganic acid are mixed to obtain mixed water, the mixed water enters a denitrification pool, the obtained water enters a precipitation pool after the denitrification is completed, the sludge of the precipitation pool refluxes to the denitrification pool through a sludge reflux pipeline, the effluent of the precipitation pool is buffered by a buffer pool, the buffered effluent enters an engineering bacterial reaction tower, oxidation is performed with engineering bacteria, and theobtained water is discharged from a water outlet. According to the present invention, the denitrification and COD removal treatment process is the treatment process having characteristics of short process and high efficiency and used for high-calcium and high-salt difficultly-biodegraded sewage, and can prevent the system from scaling induced failure and while improve the removal rate of total nitrogen and COD.

Description

technical field [0001] The invention relates to a treatment process for denitrification and COD removal of high-calcium and high-salt sewage, which belongs to the technical field of environmental protection. Background technique [0002] In the process of water treatment, salt concentration and salt shock will inhibit the growth of nitrifying bacteria, thereby affecting the progress of denitrification reaction; high calcium content is prone to scaling, affecting the normal function of microorganisms, or causing damage or paralysis of equipment. [0003] Studies have shown that by selecting appropriate sludge inoculants and domesticating sludge under appropriate conditions, microorganisms with good salt tolerance can be obtained, thereby improving the denitrification effect of high-salt sewage; river sediments in high-salt environments are commonly used active Biomechanical inoculant, but this inoculant has a longer period of acclimation to activated sludge. [0004] In the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/34C02F101/16C02F101/30
CPCC02F3/12C02F3/34C02F2101/16C02F2101/30C02F2201/007Y02W10/10
Inventor 潘咸峰梁明张广黄斌
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap