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A-A2O continuous flow sewage denitriding and dephosphorizing system and short-range denitriding method

A technology for nitrogen and phosphorus removal and sewage, applied in the direction of sustainable biological treatment, aerobic process treatment, aerobic and anaerobic process treatment, etc., can solve the problems of difficult short-term denitrification, complex operation and control, etc., to reduce costs, Good sludge settling performance and the effect of reducing the amount of sludge generated

Inactive Publication Date: 2012-05-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is about how to realize short-range denitrification in the sewage biological denitrification and phosphorus removal system. Because the system also has the function of phosphorus removal, the operation regulation is more complicated, and it is more difficult to realize short-range denitrification

Method used

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  • A-A2O continuous flow sewage denitriding and dephosphorizing system and short-range denitriding method

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Effect test

Embodiment 1

[0049] Embodiment 1: adopt as figure 1 A-A shown 2 O The continuous flow system treats the actual domestic sewage from a septic tank in a residential area. Its water quality index is: COD concentration 105-271mg / L, NH 4 + -N concentration is 56-81 mg / L, pH value is 7.1-7.5, and C / N average value is 2.53. The inoculum sludge was taken from the return sludge of the secondary settling tank of an urban sewage treatment plant in Beijing, which belongs to the whole process of denitrification sludge. During operation, the water temperature is around 23°C. The concentration of mixed liquid suspended solids (MLSS) in the reactor is (2500±500) mg / L. Operate according to the control method of the above five stages, and the operating parameters of each stage are shown in Table 1, and a total of 106d operations are performed. image 3 Shows the change of nitrite nitrogen accumulation rate during operation, Figure 4 The removal rate of ammonia nitrogen and total nitrogen during oper...

Embodiment 2

[0053] Embodiment 2: adopt as figure 1 A-A shown 2 O The continuous flow system treats the actual domestic sewage from a septic tank in a residential area. Its water quality index is: COD concentration 110-282mg / L, NH 4 + -N concentration is 52-78mg / L, pH value is 7.0-7.4, C / N average is 2.6. The inoculum sludge was taken from the return sludge of the secondary settling tank of an urban sewage treatment plant in Beijing, which belongs to the whole process of denitrification sludge. During operation, the water temperature is 20-25°C. The concentration of mixed liquid suspended solids (MLSS) in the reactor is (2400±400) mg / L. The reactor has operated for a total of 107 days, and the operation control methods and treatment effects of the five stages are as follows:

[0054] Phase I controlled the DO concentration in the aerobic zone 1 and aerobic zone 2 to be maintained at 0.3-0.5mg / L, the HRT in the aerobic zone was 4.8h, and the AHRT in the aerobic zone was 0.95h. After ...

Embodiment 3

[0059] Embodiment 3: adopt as figure 1 A-A shown 2 O The continuous flow system treats the actual domestic sewage from a septic tank in a residential area. Its water quality indicators are: COD concentration 108-268mg / L, NH 4 + -N concentration is 55~75mg / L, pH value is 7.1~7.4, C / N average is 2.5. The inoculum sludge was taken from the return sludge of the secondary settling tank of an urban sewage treatment plant in Beijing, which belongs to the whole process of denitrification sludge. During operation, the water temperature is 20-23°C. The concentration of mixed liquid suspended solids (MLSS) in the reactor is (2500±400) mg / L. The reactor has been operated for 105 days in total, and the operation control methods and treatment effects of the five stages are as follows:

[0060] In phase I, the DO concentration in the aerobic zone 1 and aerobic zone 2 was maintained at 0.3-0.5 mg / L, the HRT in the aerobic zone was 5.2 hours, and the AHRT in the aerobic zone was 1.05 hou...

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Abstract

The invention discloses an A-A2O continuous flow sewage denitriding and dephosphorizing system and a short-range denitriding method, belonging to the field of biological treatment of sewage. Short-range denitrification refers to an economical and efficient biological sewage denitriding method. The conventional short-range denitrification is mostly realized in a batch-type denitriding treatment system while short-range denitrification is difficult to realize due to the running regulating and controlling complexity of a denitriding and dephosphorizing continuous flow treatment system which is applied practically mostly. In the A-A2O continuous flow sewage denitriding and dephosphorizing system for treating domestic sewage in the invention, short-range denitrification is realized by regulating and controlling the DO (Dissolved Oxygen) concentration, the nominal hydraulic dwell time and the practical hydraulic dwell time of the aerobic region. The nitrite accumulation rate is stably maintained at 90 percent, the ammonia nitrogen removing rate is over 95 percent, and the total phosphorus removing rate is over 90 percent. According to the invention, technical problems caused by the conventional application of short-range denitrification to the continuous flow biological sewage denitriding and dephosphorizing system are solved, the application range of short-range denitrification is expanded, and running regulation and control of short-range denitrification can be realized for the continuous flow biological sewage denitriding and dephosphorizing system.

Description

technical field [0001] The present invention relates to a kind of A-A 2 A continuous flow sewage biological denitrification and phosphorus removal system and a method for realizing short-range denitrification belong to the field of sewage biological treatment. Background technique [0002] Eutrophication of water body has become a global water environment problem, one of the main reasons is the excessive discharge of nitrogen and phosphorus nutrients. In order to control the destruction of the ecological balance of natural water bodies by the excessive discharge of nitrogen and phosphorus nutrients, many countries strictly limit the amount of nitrogen and phosphorus discharged into natural water bodies. The "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) formulated by our country puts forward stricter requirements on the discharge indicators of nitrogen and phosphorus. Among them, the primary discharge standard (A standard) stipulates that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/02
CPCY02W10/10
Inventor 曾薇李磊张立东王向东彭永臻
Owner BEIJING UNIV OF TECH
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