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AAO (Anaerobic-Anoxic-Oxic)-biological contact oxidation strengthened denitrification and dephosphorization device and real-time control method of low C/N sewage treatment

A biological contact, nitrogen and phosphorus removal technology, applied in the field of sewage biological treatment, can solve the problems of low denitrification and phosphorus removal efficiency, difficulty in achieving nitrogen and phosphorus removal effects, and low nitrification efficiency, and achieve enhanced denitrification and phosphorus removal effects, The effect of solving the contradiction between long and short mud ages and alleviating the shortage of carbon sources

Active Publication Date: 2015-01-07
SHANDONG ZIER ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the coexistence of phosphorus accumulating bacteria, nitrifying bacteria and denitrifying bacteria in the AAO system, there are contradictions in sludge age and competition for carbon sources, resulting in high aeration energy consumption, low nitrification efficiency, low denitrification phosphorus removal efficiency, and aerobic pond effluent. The nitrate nitrogen is easy to cause sludge floating in the sedimentation tank, etc.
The existence of these problems makes it difficult for the simple AAO process to achieve a stable nitrogen and phosphorus removal effect. Therefore, it is necessary to carry out further transformation and optimization.

Method used

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  • AAO (Anaerobic-Anoxic-Oxic)-biological contact oxidation strengthened denitrification and dephosphorization device and real-time control method of low C/N sewage treatment

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Experimental program
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Effect test

specific Embodiment approach 1

[0036] The DO sensor 32 collects the dissolved oxygen concentration in each compartment of the biological contact oxidation tank 4 online, and the control of the nitrification process can be realized through the calculation output of the computer 33 . The DO in the first two grids is controlled at 2.5-4.0mg / L, the DO in the last two grids is controlled at 0.5-2.0mg / L, and the total gas volume is 0.1-0.6m 3 / h. NH 4 + The sensor 28 collects the ammonia nitrogen concentration in the outlet water tank 6 online, and obtains the real-time control variable through the calculation output of the computer 33 . When NH 4 + When the concentration is ≥2mg / L, increase the aeration rate to 0.5-0.6m 3 / h; when NH 4 + When the concentration is ≤0.5mg / L, reduce the aeration rate to 0.3~0.4m 3 / h; when NH 4 + Concentration ≤ 0.5mg / L and effluent nitrite accumulation rate NO 2 - / NO x - ≤30%, reduce the aeration rate to 0.1~0.2m 3 / h.

specific Embodiment approach 2

[0037] The DO sensor 32 collects the dissolved oxygen concentration in each compartment of the biological contact oxidation tank 4 online, and the control of the nitrification process can be realized through the calculation output of the computer 33 . The DO in the first two grids is controlled at 2.5-4.0mg / L, the DO in the last two grids is controlled at 0.5-2.0mg / L, and the total gas volume is 0.1-0.6m 3 / h. NO 3 - Sensor 29 and NO 2 - The sensor 30 collects the concentrations of nitrate nitrogen and nitrite nitrogen in the outlet water tank 6 online, and obtains real-time control variables through the calculation output of the computer 33 . when NO 3 - +NO 2 - When the concentration is ≥14mg / L, increase the reflux ratio of the nitrification solution to 300% to 400%; when NO 3 - +NO 2 - When the concentration is ≤6mg / L, reduce the reflux ratio of the nitrification solution to 100%-200%.

specific Embodiment approach 3

[0038] The DO sensor 32 collects the dissolved oxygen concentration in each compartment of the biological contact oxidation tank 4 online, and the control of the nitrification process can be realized through the calculation output of the computer 33 . The DO in the first two grids is controlled at 2.5-4.0mg / L, the DO in the last two grids is controlled at 0.5-2.0mg / L, and the total gas volume is 0.1-0.6m 3 / h. The TP sensor 31 collects the TP concentration in the outlet water tank 6 online, and obtains the real-time control variable through the calculation output of the computer 33 . When the TP concentration is ≥1mg / L, increase the reflux ratio of the nitrification solution to 300%-400%; when the TP concentration is ≤0.2mg / L, reduce the reflux ratio of the nitrification solution to 100%-200%.

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Abstract

The invention discloses an AAO (Anaerobic-Anoxic-Oxic)-biological contact oxidation strengthened denitrification and dephosphorization device and a real-time control method of low C / N sewage treatment. The system is mainly composed of a raw water tank, an AAO reactor, an intermediate sedimentation tank, a biological contact oxidation tank, a settling zone, a discharged water tank, an online control box and a computer. The real-time control method is as follows: a DO sensor online collects concentrations of dissolved oxygen in grid cells of the biological contact oxidation tank, and the computer calculates and outputs the concentrations to control the nitrification process; a NH<4+> sensor, a NO<3-> sensor, a NO<2-> sensor and a TP sensor online collect the concentrations of ammonia nitrogen, nitrate, nitrite and total phosphorus in the discharged water tank, and the computer calculates and outputs according to the signals collected by the sensors to adjust the aeration amount, the reflux ratio of nitrifying liquid and water intake C / N. By adopting the online real-time control equipment, the system operation is optimized, the energy is saved, the consumption is reduced, the carbon source and the aeration amount are saved and the residual sludge is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and is especially suitable for the deep denitrification and phosphorus removal of new sewage treatment plants and the upgrading of old sewage treatment plants. This form of enhanced nitrogen and phosphorus removal method. Background technique [0002] The eutrophication of water body caused by excessive discharge of nitrogen and phosphorus is one of the most concerned environmental problems by the national government and the public. The most fundamental way to control water eutrophication and prevent water pollution is to control pollution sources, control the nitrogen and phosphorus content in the effluent of sewage treatment plants, and make them meet certain discharge standards. The sewage discharge standard (GB18918-2002) promulgated by my country stipulates that the nitrogen and phosphorus content of all effluents must meet the first-class A standard, which puts forward ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F3/02
CPCY02W10/10
Inventor 彭永臻张淼王淑莹汪传新隋军
Owner SHANDONG ZIER ENVIRONMENTAL TECH CO LTD
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