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Method for starting A2N two-stage SBR denitrifying phosphorus removal

A denitrification phosphorus removal and nitrification sludge technology, applied in the field of urban sewage treatment and resource utilization, can solve the problems of difficult enrichment of denitrification phosphorus-accumulating bacteria, increase process complexity and cost, and be unfavorable for engineering applications, etc., to achieve Good water discharge effect, convenient engineering application, fast start-up effect

Active Publication Date: 2013-11-06
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Use actual domestic sewage to directly start denitrification and phosphorus removal, with long start-up period and low sludge concentration after start-up
This is not conducive to engineering applications
And regular A 2 The N two-stage SBR process can only screen denitrifying phosphorus accumulating bacteria, and it is not easy to enrich denitrifying phosphorus accumulating bacteria: in the early stage, mature aerobic phosphorus removal sludge was obtained in the first SBR reactor, and the second SBR reactor obtained After the mature nitrification sludge, it is necessary to add nitrate nitrogen to the first SBR reactor to induce the conversion of aerobic phosphorus accumulating bacteria into denitrifying phosphorus accumulating bacteria, run in anaerobic-anoxic mode for 15 days, and then connect the second SBR reactor, according to A 2 Only by running in N mode can the startup be successful quickly
This increases the complexity and cost of the process

Method used

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  • Method for starting A2N two-stage SBR denitrifying phosphorus removal

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Embodiment 1

[0016] Example 1 The reactor form is two SBR reactors with an effective volume of 60L. The first SBR reactor is operated with stirring, and the second SBR reactor is operated with aeration. figure 1 . The reaction temperature is room temperature (20~25°C). First, the activated sludge retrieved from the sewage plant is inoculated in the first SBR reactor. The initial phosphorus removal rate of the sludge is only 10%. ——Aerobic intermittent mode operation: water intake—anaerobic—aerobic—sedimentation—drainage, anaerobic time is controlled at 3~5 hours, DO is less than 0.2mg / L, and aerobic time is controlled at 4~6 hours, DO is controlled at 2~3mg / L, and the precipitation time is 0.5~1 hour. After 15 days of continuous operation in this way, the phosphorus removal rate is stable at 75% to 90%. It is believed that a mature aerobic phosphorus removal sludge has been obtained. Due to the actual domestic sewage operation, more nitrite nitrogen has accumulated. The absorption of pho...

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Abstract

The invention discloses a method for starting A2N two-stage SBR denitrifying phosphorus removal, and belongs to the field of municipal sewage treatment. The invention aims to solve the problems that in the starting process of denitrifying phosphorus removal in the prior art, the growth rate of denitrifying phosphorus removal bacteria is low, and has poor competitive power as compared with aerobic phosphorus-accumulating bacteria, so that nitrate nitrogen is required to be added for enrichment, the starting is difficult, and the cost is increased; and that direct starting of denitrifying phosphorus removal using domestic wastewater requires long acclimation time, and the sludge concentration is greatly reduced due to elutriation. According to the invention, aerobic phosphorus-accumulating bacteria and nitrifying bacteria are respectively cultivated and mixed uniformly according to the mass ratio of 2: 1; the aerobic running strengthens the nitrification-denitrification effect until the oxidation rate of ammonia nitrogen reaches more than 90%, the removal ratio of COD reaches more than 75%, 1 / 3 of the volume of the sludge is separated to enter into another reactor. The original reactor can be used as a denitrifying phosphorus removal reactor, and the two SBR reactors are operated in an A2N mode. By using the method provided by the invention, the starting speed of denitrifying phosphorus removal using actual domestic wastewater is fast, the sludge concentration after starting is high, and nitrate nitrogen is not required to be added during the starting period.

Description

technical field [0001] The present invention relates to a kind of starting A 2 The invention discloses a method for denitrification and phosphorus removal by N two-stage SBR, which belongs to the field of urban sewage treatment and resource utilization. Background technique [0002] Nitrogen and phosphorus are the main factors causing lake eutrophication. At present, the main goal of sewage treatment in my country is still COD. The removal of nitrogen and phosphorus is not enough attention. The concentration of ammonia nitrogen in the actual domestic sewage of the community is 50~70mg / L, and the concentration of phosphorus is 6 ~7mg / L, due to the different sludge ages of nitrifying bacteria and aerobic phosphorus accumulating bacteria, limited COD in sewage, etc., the removal of nitrogen and phosphorus cannot be taken into account. Sewage plants usually operate in the way of biological denitrification and chemical phosphorus removal, which increases the cost of sewage treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 李冬许达梁瑜海张肖静张玉龙张翠丹杨胤苏庆玲吴青门绚何永平吴迪曾辉平张杰
Owner BEIJING UNIV OF TECH
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