Method for realizing semi-hitrosation under normal temperature municipal sewage condition

A technology for urban sewage and conditions, applied in the field of urban sewage treatment and resource utilization, can solve the problem of high energy and material consumption of biological denitrification, and achieve the effects of short start-up period, alleviation and solution of water crisis, and simple operation.

Inactive Publication Date: 2009-05-27
BEIJING UNIV OF TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high energy consumption and high material consumption of existing urban sewage biological denitrification, and provide a method for realizing semi-nitrosation under normal temperature urban sewage conditions based on the high-efficiency and low-consumption Anammox biological denitrification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A biofilter column reactor is used. The diameter of the biological filter column reactor is 20cm, and the height is 3m. The bottom layer is paved with 20cm high pebbles with a particle size of 1-2cm as a supporting layer, and 150cm of volcanic rock with a particle size of 6-8mm is added as the main reaction zone filler. The gas device strictly controls the concentration of dissolved oxygen in the reactor water. In the start-up stage, connect ordinary sludge with nitrification function, and control the dissolved oxygen concentration in the treated water in the range of 2-4mg / L. Under this operating condition, after 10 days, the nitrification rate of the reactor effluent will reach 50%, which is considered good. Oxy-nitrification sludge film formation was successful. On this basis, NH was added to the reactor influent 4 + -N, make NH 4 + -The concentration of N reaches the range of 200-250mg / L, and the dissolved oxygen is controlled in the range of 0.2-0.4mg / L, and i...

Embodiment 2

[0031] Using SBR reactor. The effective volume of the SBR reactor is 5L, and an aeration device is installed at the bottom to control the concentration of dissolved oxygen in the treated water, and a stirrer is installed to strengthen the matrix transfer. In the start-up stage, connect ordinary sludge with nitrification function, and control the dissolved oxygen concentration in the treated water in the range of 2-3mg / L. Under this operating condition, after 7 days, the nitrification rate of the reactor effluent will reach 50%, which is considered good. The domestication of oxynitrification sludge was successful. On this basis, NH was added to the reactor influent 4 + -N, make NH 4 + -The concentration of N reaches the range of 160-230mg / L, and the dissolved oxygen is controlled in the range of 0.1-0.4mg / L, and it runs for 10 days under this condition. When the reactor effluents NO 2 - The concentration of -N exceeds that of NH in raw sewage 4 + -1 / 2 of the N concentra...

Embodiment 3

[0033] The continuous flow activated sludge process reaction tank is adopted. The main reaction area of ​​the continuous flow activated sludge process reactor is equipped with an aeration device and a stirring device, which are used to control dissolved oxygen and substrate transfer respectively. Part of the sludge in the sedimentation area is returned to the main reaction area through a peristaltic pump. In the start-up stage, connect ordinary sludge with nitrification function, and control the dissolved oxygen concentration in the treated water to be in the range of 2-4mg / L. Under this operating condition, after 8 days, the nitrification rate of the reactor effluent will reach 50%, which is considered good. The domestication of oxynitrification sludge was successful. On this basis, NH was added to the reactor influent 4 + -N, make NH 4 + -N concentration reaches the range of 190-240mg / L, and the dissolved oxygen is controlled in the range of 0.1-0.5mg / L, and it runs for ...

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Abstract

The invention relates to a method for realizing semi-nitrosation under a condition of room-temperature municipal sewage, and belongs to the field of municipal sewage treatment and reuse. The invention aims at solving the problems of high-energy and high-material consumption during the prior biological denitrification for municipal sewage and providing proper water input for applying anaerobic ammoxidation process to the denitrogenation treatment for municipal sewage. The method is successfully applied for the first time to the biological treatment of the semi-nitrosation of municipal sewage through control of low dissolved oxygen and auxiliary addition of part of ammonia salts under the condition of room-temperature municipal sewage, thereby ensuring the application of the high-efficiency low-consumption anaerobic ammoxidation process to the biological denitrification of municipal sewage. The method has the advantages of short reactor starting cycle, simple operation, stable system running, good sewage treatment effects, low cost, and the like.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a high-efficiency and low-energy-consumption biological denitrification method specially used for urban sewage under normal temperature conditions. Background technique [0002] The traditional nitrification / denitrification biological denitrification process has played a very important role in the field of wastewater denitrification. However, the energy consumption in the nitrification stage is huge: if the proliferation of nitrifying bacteria in the nitrification process is not considered, the oxidation of 1g of ammonia nitrogen (NH 4 + -N) is nitrate nitrogen (NO 3 - -N) will consume 4.57gO 2 , 7.14g alkalinity (as CaCO 3 In the denitrification stage, the demand for carbon source is high, and 1gNO can be reduced 3 - -N requires 2.86 g of biodegradable COD as a hydrogen donor. Due to the low C / N value of urban domestic sewage, the biggest p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/68C02F3/34
Inventor 李冬王俊安张杰韩煦杜贺
Owner BEIJING UNIV OF TECH
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