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Device for improving advanced nitrogen and phosphorus removal by step feed and method

A technology of deep denitrification and staged water inflow, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It is beneficial to recycling, saving energy consumption for aeration, and preventing eutrophication of water bodies.

Active Publication Date: 2011-07-13
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, with the rapid development of water treatment technology and increasingly stringent discharge standards, the current actual operation process has gradually exposed the shortcomings of the UCT process: ① Since the process involves three return pipelines, the energy consumption is large, and the pipeline layout complex
②Unable to make full use of raw water carbon source
Most of China's urban sewage with low C / N ratio, the lack of carbon source has become a barrier that cannot improve the efficiency of nitrogen and phosphorus removal, and the addition of carbon source will greatly increase the cost of sewage treatment

Method used

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  • Device for improving advanced nitrogen and phosphorus removal by step feed and method
  • Device for improving advanced nitrogen and phosphorus removal by step feed and method
  • Device for improving advanced nitrogen and phosphorus removal by step feed and method

Examples

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Effect test

example 1

[0039] Taking the actual domestic sewage in a family area of ​​a university in Beijing as the treatment object (COD=180-265mg / L, TN=43.8-86.5mg / L, TP=4-8.4mg / L, C / N=2.08-6.05, C / P =21.4-66.3), the hydraulic retention time is 8h, the sludge age is 8-12d, the average sludge concentration is 3500±150mg / L, the sludge reflux ratio is 0.75, and the temperature is controlled by the heating rod at about 20°C. The test results show that the average COD The removal rate was 84.6%, and the average removal rates of TN and TP were 79% and 90%, respectively.

example 2

[0041] Taking the effluent from the primary sedimentation tank of a sewage treatment plant in Beijing as the treatment object (COD=119-565mg / L, TN=24.6-79.5mg / L, TP=0.48-13.3mg / L, C / N=1.5-6.4, C / N=1.5-6.4, C / P=35.7-74.5), hydraulic retention time 8-10h, sludge age 8-12d, average sludge concentration 5000±150mg / L, sludge reflux ratio 0.5-0.75, temperature controlled by heating rod at about 20°C, test The results showed that the average removal rate of COD was 87%, and the average removal rates of TN and TP were 82.5% and 95.02%, respectively. figure 2 , image 3 shown.

[0042] figure 2 In order to take the actual sewage as the treatment object, the system has been running continuously for more than 3 months to remove TN. The daily processing capacity in the pilot scale reactor is Q=1.02m 3 In the case of / d, the results of three consecutive months of operation show that although the influent TN fluctuates greatly, the effluent water quality is basically maintained below...

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Abstract

The invention relates to a device for improving advanced nitrogen and phosphorus removal by step feed and a method thereof, belonging to the technical field of sewage biological treatment with biochemical method. Aiming at the defects of the prior A / O step feed technology such as that the biological phosphorus can not be synchronously removed, an UCT technology has high energy consumption and morecomplex operation and the like, the invention combines the UCT technology with the step feed technology, improves the nitration step of the UCT technology into the series run mode of a continuous two-stage A / O technology, and combines with the strategy of the step feeding of each segmental anoxic diacritical point so as to develop the high-efficiency nitrogen and phosphorus removal technology with the effect of denitrifying dephosphorization. A first segment is provided with an anaerobic reactor, a sedimentation tank returns mud to a hypoxia reactor at the first segment, and the hypoxia reactor is added into the return line of mixed liquor of the anaerobic reactor without nitrified liquid internal reflux facilities from an aerobic reactor to the hypoxia reactor. The invention has stable water flow quality and lower energy consumption.

Description

technical field [0001] The invention relates to a device and method for removing biochemical organic matter and nitrogen and phosphorus nutrients in urban domestic sewage. It belongs to the technical field of biochemical sewage biological treatment. The tandem operation mode of the two-stage A / O process, and combined with the strategy of anoxic point water inflow in each stage, realizes simultaneous denitrification and phosphorus removal with the function of denitrification and phosphorus removal, and is suitable for large, medium and small urban domestic sewage And industrial wastewater deep nitrogen and phosphorus removal treatment. Background technique [0002] my country's "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) promulgated in 2002 requires that the effluent water quality of all sewage units should be less than 5mg / L for ammonia nitrogen, less than 15mg / L for total nitrogen, and less than 0.5mg / L for total phosphorus. The chemical oxyge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 彭永臻葛士建
Owner BEIJING UNIV OF TECH
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