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A method for deep denitrification of low C/N domestic sewage based on regular dosing of oxidized nitrogen

A technology for domestic sewage and deep denitrification, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. The effect of volume and aeration rate, reduction of treatment cost, and large adjustment range

Active Publication Date: 2022-04-08
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY +2
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Problems solved by technology

[0005] The present invention aims at the problem of high effluent nitrogen concentration and deep denitrification due to insufficient carbon source in the denitrification process of domestic sewage, and adopts normal dosing of oxidized nitrogen to promote the anaerobic ammonium oxidation autotrophic denitrification process and improve the overall denitrification efficiency

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  • A method for deep denitrification of low C/N domestic sewage based on regular dosing of oxidized nitrogen
  • A method for deep denitrification of low C/N domestic sewage based on regular dosing of oxidized nitrogen
  • A method for deep denitrification of low C/N domestic sewage based on regular dosing of oxidized nitrogen

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Embodiment 1

[0035] This embodiment takes the addition of nitrite nitrogen as an example (such as figure 2 shown), the main idea is to make the biodegradable organic matter in the influent water be used to reduce nitrate nitrogen in the primary anoxic pool by adjusting the internal and external reflux ratio, and at the same time make the nitrogen in the effluent of the primary anoxic pool mainly be ammonia nitrogen Form exists, by controlling the dosage of nitrous nitrogen in the secondary anoxic pool (or the effluent of the primary anoxic pool) to promote the anaerobic ammonia oxidation reaction, specifically including the following steps:

[0036] Step 1. Domestic sewage passes through pretreatment facilities such as grille, aerated desilter, and primary sedimentation tank to remove large particle pollutants such as scum and sand.

[0037] Step 2. Assume that the pretreated domestic sewage COD is 100mg / L (assuming that 50mg / L is easily biodegradable COD that can be used for denitrificat...

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Abstract

The invention discloses a method for deep denitrification of low C / N domestic sewage based on the normal addition of oxidized nitrogen. The invention provides a method for deep denitrification of low C / N domestic sewage based on the normal addition of oxidized nitrogen, which includes the following steps: the pretreated domestic sewage enters the first-level anoxic tank and the second-level anoxic tank in sequence. and an aerobic tank for denitrification treatment; and then carry out mud and water separation in the secondary sedimentation tank to achieve deep denitrification of domestic sewage with low C / N; wherein, nitrate nitrogen is added to the first-level anoxic tank, or Add nitrite nitrogen to the secondary anoxic pool so that the ratio of ammonia nitrogen and nitrite nitrogen in the secondary anoxic pool is 1:1 to 1.5 to strengthen the automatic anaerobic ammonium oxidation in the secondary anoxic pool. Nitrogen removal process. The invention is used for deep denitrification treatment of domestic sewage with low C / N.

Description

Technical field [0001] The invention relates to a method for deep denitrification of low C / N domestic sewage based on the normal addition of oxidized nitrogen, and belongs to the field of environmental protection. Background technique [0002] Nitrogen and phosphorus are one of the important substances that cause eutrophication of water bodies. As an important facility for reducing nitrogen and phosphorus pollutants, urban sewage plants are responsible for denitrification and phosphorus removal of sewage. Therefore, increasingly stringent sewage discharge standards have been formulated, especially those for nitrogen and phosphorus. Biological denitrification is the most cost-effective and efficient method of sewage denitrification. The conventional biological denitrification process is nitrification and denitrification, which converts nitrogen in sewage into nitrogen gas. The reaction process requires the consumption of carbon sources. When the C / N of domestic sewage is lo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/302C02F3/307C02F2209/08C02F2101/16
Inventor 苑泉徐恒汪翠萍孙迎雪
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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