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High-calcium high-salt sewage denitrification carbon source

A technology for high-salt sewage and denitrification, applied in water/sewage treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Can not take into account the stable operation of the system and other issues, to achieve the effect of reducing the scaling trend of calcium ions, alleviating severe scaling problems, and achieving a smooth and efficient reaction

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. The carbon source of pure components can only provide electron donors, and cannot take into account the stable operation of the system
[0010] 2. High salinity has an inhibitory effect on microorganisms. After the system is impacted, the treatment effect recovers slowly
[0011] 3. The alkalinity produced in the denitrification process promotes calcium hard precipitation, which is mixed in the sludge, causing the sludge to settle too quickly and deposit at the bottom of the tank, resulting in a decrease in the treatment effect and an increase in the mixing cost
[0012] 4. The alkalinity produced in the denitrification process promotes calcium hard precipitation, and the frequency of cleaning and maintenance of equipment and facilities is high, which affects normal operation
When the operation and maintenance costs are too high, the sewage treatment system will be forced to close

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The present invention is used to treat the sewage in the neutralization tank of a refinery sewage, COD 50mg / L, total nitrogen 180mg / L, calcium hardness 4000mg / L, ammonia nitrogen 20mg / L, conductivity 30000μS / cm. Dosing the carbon source described in the present invention, the dosing concentration of acetic acid is 900mg / L, the dosing concentration of polyepoxysuccinic acid is 50mg / L, the concentration of sodium hypochlorite available chlorine is 0.05mg / L, and the pH value of sulfuric acid is adjusted to be 4.0~4.4.

[0053] The results were: effluent COD42~47mg / L, total nitrogen 6~15mg / L, calcium hardness 3850~3950mg / L, ammonia nitrogen was not detected.

Embodiment 2

[0055] The invention is used to treat the reverse osmosis concentrated water of a factory chemical sewage, COD140mg / L, total nitrogen 120mg / L, calcium hard 1600mg / L, ammonia nitrogen 3mg / L, conductivity 20000μS / cm. Add the carbon source of the present invention, the concentration of acetic acid is 360mg / L, the concentration of polyepoxysuccinic acid is 10mg / L, the concentration of sodium hypochlorite available chlorine is 0.1mg / L, and the pH value of the influent is adjusted by sulfuric acid. 4.5~5.0.

[0056] The results are: effluent COD130~100mg / L, total nitrogen 12~20mg / L, calcium hardness 1550~1600mg / L, ammonia nitrogen was not detected.

Embodiment 3

[0058] The chemical sewage of a certain factory is treated by the present invention, COD 100mg / L, total nitrogen 200mg / L, calcium hard 2200mg / L, ammonia nitrogen 7mg / L, conductivity 17000μS / cm. Dosing carbon source of the present invention, acetic acid dosing concentration is 800mg / L, polyepoxysuccinic acid dosing concentration is 30mg / L, the concentration of sodium hypochlorite available chlorine is 0.3mg / L, and sulfuric acid adjusts influent pH value to be 4.2~4.7.

[0059] The results were: effluent COD50~70mg / L, total nitrogen 13~25mg / L, calcium hardness 2100~2200mg / L, ammonia nitrogen was not detected.

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Abstract

The invention relates to a high-calcium high-salt sewage denitrification carbon source and belongs to the technical field of sewage treatment. The high-calcium high-salt sewage denitrification carbonsource comprises an electron donor component, a scale inhibition component, a denitrification control component and an aid component. By adopting the high-calcium high-salt sewage denitrification carbon source provided by the invention, total nitrogen in sewage is effectively reduced, deposition of calcium solids is effectively prevented, the source is applicable to water quality fluctuation, andstable operation of a sewage treatment system is maintained.

Description

technical field [0001] The invention relates to a carbon source for denitrification of high-calcium and high-salt sewage, belonging to the technical field of sewage treatment. Background technique [0002] With the increasingly stringent sewage discharge standards, the total nitrogen discharge indicators are becoming more and more stringent. The national environmental protection department stipulates that from January 1, 2017, the existing sewage treatment plants will implement the discharge standard of total nitrogen ≤ 30mg / L. For most sewage treatment systems, the biological nitrification and denitrification process is adopted, that is, the total nitrogen is removed through the anaerobic oxygen nitrification and anaerobic denitrification of microorganisms, which can reduce the total nitrogen to the standard level. This method is the most economical and effective. However, for certain high-salt, high-calcium, and high-total-nitrogen wastewater, especially recycled water fro...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F1/50C02F1/00C02F3/00C02F101/16
CPCC02F1/00C02F1/50C02F3/00C02F5/10C02F2101/16
Inventor 梁明潘咸峰张广
Owner CHINA PETROLEUM & CHEM CORP
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