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Synchronous nitrogen and phosphorus removal sewage treatment process

A simultaneous denitrification and phosphorus removal and sewage treatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex operation methods and high costs, and achieve environmental protection The effect of utilization

Active Publication Date: 2019-12-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a synchronous denitrification and dephosphorization sewage treatment process to overcome the disadvantages of complex operation methods and high costs in the prior art when chemical dephosphorization is combined with biological treatment methods

Method used

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Examples

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Effect test

Embodiment 1

[0042] In the sewage treatment process for synchronous denitrification and phosphorus removal in this embodiment, the concentration of nitrate nitrogen in the wastewater is 120 mg-N / L, and the concentration of phosphate is 20 mg-P / L. Specific steps include:

[0043] Step 1: Wastewater containing nitrogen and phosphorus pollutants first enters the chemical phosphorus removal section A to remove part of the phosphorus in the sewage. Part of the sewage after phosphorus removal in the chemical phosphorus removal section A enters the heterotrophic denitrification section B for denitrification, and the other part Sewage enters autotrophic denitrification section C for denitrification. The pH of the chemical phosphorus removal section A is controlled at 5-5.3, and the phosphate removal rate reaches 65% after this stage, and the phosphorus removal capacity of the returning sludge in the autotrophic section is 0.9mg-P / (g VSS min).

[0044] Step 2: Add sodium acetate to the sewage in t...

Embodiment 2

[0049] In the sewage treatment process for synchronous denitrification and phosphorus removal in this embodiment, the concentration of nitrate nitrogen in the wastewater is 120 mg-N / L, and the concentration of phosphate is 20 mg-P / L. Specific steps include:

[0050] Step 1: Wastewater containing nitrogen and phosphorus pollutants first enters the chemical phosphorus removal section A to remove part of the phosphorus in the sewage. Part of the sewage after phosphorus removal in the chemical phosphorus removal section A enters the heterotrophic denitrification section B for denitrification, and the other part Sewage enters autotrophic denitrification section C for denitrification. The pH of the chemical phosphorus removal section A is controlled at 5-5.3, and the phosphate removal rate reaches 77% after this stage, and the phosphorus removal capacity of the returning sludge in the autotrophic section is 0.95mg-P / (g VSS min).

[0051] Step 2: Add sodium acetate to the sewage in ...

Embodiment 3

[0056] In the sewage treatment process for synchronous denitrification and phosphorus removal in this embodiment, the concentration of nitrate nitrogen in the wastewater is 120 mg-N / L, and the concentration of phosphate is 20 mg-P / L. Specific steps include:

[0057] Step 1: Wastewater containing nitrogen and phosphorus pollutants first enters the chemical phosphorus removal section A to remove part of the phosphorus in the sewage. Part of the sewage after phosphorus removal in the chemical phosphorus removal section A enters the heterotrophic denitrification section B for denitrification, and the other part Sewage enters autotrophic denitrification section C for denitrification. The pH of the chemical phosphorus removal section A is controlled at 5-5.3, and the phosphate removal rate reaches 72% after this stage, and the phosphorus removal capacity of the returning sludge in the autotrophic section is 0.92mg-P / (g VSS min).

[0058] Step 2: Add sodium acetate to the sewage in ...

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Abstract

The invention discloses a synchronous nitrogen and phosphorus removal sewage treatment process. The treatment process comprises two parts of chemical phosphorus removal and biological nitrogen removal, wherein biological nitrogen removal is divided into a heterotrophic denitrification process and an autotrophic denitrification process, and all sludge subjected to biological nitrogen removal returns to a chemical phosphorus removal section. By means of the treatment process, the continuity of nitrogen and phosphorus removal is achieved, the dosage of added chemicals is reduced, and the cost isreduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a process for synchronously denitrifying and dephosphorizing sewage treatment. Background technique [0002] In recent years, my country's economy has been steadily improving, and the water environment has been polluted to various degrees, the most serious of which is water eutrophication. This situation is mainly caused by excessive discharge of nitrogen and phosphorus elements, and the main sources of nitrogen and phosphorus elements are untreated or incompletely treated urban domestic sewage, industrial wastewater, organic waste, and agricultural fertilizers. As an important nutrient element for aquatic organisms, once the nitrogen and phosphorus elements exceed the standard, the algae and plankton in the water will multiply and excessively consume dissolved oxygen in the water, resulting in the death of fish and various organisms due to lack of oxygen, reducing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/10
CPCC02F1/58C02F3/28C02F2101/105C02F2101/163C02F2301/046C02F2305/06
Inventor 王茹于丽萍刘冰茵
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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