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High-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater

A simultaneous denitrification and dephosphorization, low-concentration technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effects of shortening HRT, increasing treatment load, and increasing treatment capacity

Inactive Publication Date: 2012-09-26
BEIJING UNIV OF TECH
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Problems solved by technology

[0016] At present, the problem that needs to be solved urgently in the traditional pre-denitrification A / O process is how to realize the high-efficiency biological denitrification performance, and at the same time, how to improve the utilization rate of influent carbon source; while the urgent problem faced by the segmented influent A / O deep denitrification process is how to realize Simultaneous biological phosphorus removal performance, how to solve the influence of nitrate in return sludge on anaerobic phosphorus release while strengthening phosphorus removal

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  • High-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater
  • High-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater
  • High-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater

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[0047]Taking the effluent of the swirling grit chamber of a sewage treatment plant in Jiangsu Province as the treatment object (COD=89-200mg / L, TN=22-42mg / L, TP=2.2-6.7 mg / L, C / N=2.18- 6.2, C / P=21.2-78.8), hydraulic retention time 8.7h, sludge age 10-15d, average sludge concentration 5600 mg / L, sludge reflux ratio 50%-75%, temperature controlled by heating rod at 20 -22°C, the anaerobic / anoxic / aerobic volume ratio is 4:8:10. The test results show that the optimal flow distribution ratio of the system is 20%:35%:35%:10%; under this working condition, the effluent quality of COD, ammonia nitrogen, total nitrogen, and total phosphorus are 33.05 mg.L respectively -1 , 0.58 mg.L -1 , 9.26 mg.L -1 , 0.46 mg.L -1 , and the removal rates were 78.90%, 98.31%, 70.24%, and 86.11%, respectively.

[0048] image 3 In order to take the actual sewage as the treatment object, the system has been continuously operated for more than 4 months to remove ammonia nitrogen and TN. In the case ...

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Abstract

A high-efficiency nitrogen and phosphorus synchronous removal method in treating low concentration wastewater belongs to the technical field of biochemical process sewage biological treatment. Aiming at the characteristics of low pollutant concentration and low water inlet C / N in low concentration wastewater, and the disadvantages of low carbon source utilization rate, poor effect of nitrogen and phosphorus synchronous removal, high energy consumption, etc. of a traditional A / O technology in treating the sewage, the method of the invention combines the traditional A / O technology and a step feed technology: an A / O technology anoxic segment is changed into a prepositioned pre-anoxic segment and an anaerobic segment by adding a baffle wall in the A / O technology anoxic segment, and sludge flows backwards to the pre-anoxic denitrification segment; and a nitrated stage is improved with an anoxic-aerobic alternative operation mode, and raw water is separately introduced into each anoxic segment and anaerobic segment by part. Through controlling a four part water inlet flow ratio and controlling the DO of a first aerobic segment as 1.5 to 2 mg / L, and the DO of a second aerobic segment and a third aerobic segment as 1.0 to 1.5mg / L, the method of the invention can realize the water inlet carbon source effective utilization rate of the low concentration city sewage reaching 77% and outlet water reaching first level A discharge standards.

Description

technical field [0001] The invention relates to a method for removing biochemical organic matter and nitrogen and phosphorus nutrients in low-concentration urban domestic sewage, which belongs to the technical field of biochemical sewage biological treatment. A partition wall is added to the anoxic section of the A / O process to become a front-end pre-anoxic In the denitrification section and anaerobic section, the sludge returns to the pre-anoxic denitrification section; the nitrification stage is improved to an anoxic / aerobic alternate operation mode, and the raw water is distributed into each anoxic section and anaerobic section at the same time, and the development of a The synchronous denitrification and dephosphorization process with short water retention time and high carbon source utilization rate is suitable for the deep denitrification and dephosphorization treatment of low-concentration domestic sewage and industrial wastewater in our large, medium and small towns. ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 王淑莹曹贵华汪传新彭永臻
Owner BEIJING UNIV OF TECH
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