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Sulfur autotrophic nitrogen sulfur double-removing process in sewage treatment plant

A sewage treatment plant, sulfur autotrophic technology, applied in the direction of reduced water/sewage treatment, water/sludge/sewage treatment, biological sludge treatment, etc., can solve the problem of high cost and achieve the effect of saving pharmaceutical costs

Inactive Publication Date: 2019-10-25
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the carbon source, the cost of removing these last nitrates with nitrogen is relatively high --- need to add a reducing agent to the water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] This embodiment is a municipal sewage treatment plant in Beijing, which implements the local standards of Beijing (standard A in DB11 / 890-2012: COD<20, BOD<4, NH3-N<1, TN<10). In terms of indicators, COD and BOD indicators are already very low. After a long period of aeration, the composition of its TN is mainly nitrate nitrogen. The plant is equipped with a sludge digestion process unit, therefore, the plant has selected the sulfur autotrophic nitrogen and sulfur double removal process, and its operation steps are:

[0014] Step 1. Mix the effluent from the secondary settling tank of the sewage treatment plant and the biogas generated by digesting the sludge in a closed reactor, and at the same time, add powdered lime; since the main component of the biogas is CH 4 , CO 2 and H 2 S, and the amount of water in the secondary settling tank is extremely large, therefore, all H 2 S and part of CO 2 Dissolved in water to make the water acidic, and the added powdered lime...

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Abstract

The invention discloses a sulfur autotrophic nitrogen sulfur double-removing process in a sewage treatment plant. Nitrate nitrogen is contained in effluent of the sewage treatment plant, and hydrogensulfide is contained in biogas generated through sludge digestion of the sewage treatment plant, the effluent is mixed with the biogas (and adding alkali), the hydrogen sulfide is dissolved in the effluent, and desulfurization of the biogas is realized; and the effluent dissolved with the hydrogen sulfide is subjected to sulfur autotrophic denitrification reaction, denitrificationof the effluent is realized.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a sewage denitrification treatment process. Background technique [0002] Most of the effluent indicators stipulated in the A standard of DB11 / 890-2012 have reached the indicators of surface class III water (surface class III water is the standard for secondary protection areas of drinking water sources), but its total nitrogen index It is 10mg / L. [0003] Total nitrogen is also one of the factors causing water eutrophication. That is to say: Although Beijing has spent a lot of money to make most of the effluent indicators of sewage treatment plants meet the standards of surface water of Class III, due to the poor total nitrogen indicators, the threat of eutrophication of water bodies Still big. [0004] Most of the substances that form total nitrogen in the effluent of sewage treatment plants are nitrate nitrogen. Due to the carbon source, the cost of removing these last nitrates...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F11/04C02F101/16C02F101/10
CPCC02F1/70C02F11/04C02F2101/101C02F2101/16
Inventor 张建中
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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