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 difficult to achieve nitrogen and phosphorus removal effects, low denitrification and phosphorus removal efficiency, 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: 2014-01-08
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
Comparison scheme
Effect test

specific Embodiment approach 1

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

specific Embodiment approach 2

[0037] The DO sensor 32 collects the dissolved oxygen concentration in each cell of the biological contact oxidation tank 4 online, and can realize the control of the nitrification process through the calculation output of the computer 33. The DO of the first two grids is controlled at 2.5~4.0mg / L, the DO of 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 concentration of nitrate nitrogen and nitrite nitrogen in the 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%~400%; when NO 3 - +NO 2 - When the concentration is less than or equal to 6mg / L, reduce the reflux ratio of the nitrification solution to 100% to 200%.

specific Embodiment approach 3

[0038] The DO sensor 32 collects the dissolved oxygen concentration in each cell of the biological contact oxidation tank 4 online, and can realize the control of the nitrification process through the calculation output of the computer 33. The DO of the first two grids is controlled at 2.5~4.0mg / L, the DO of 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 water tank 6 online, and obtains real-time control variables through the calculation output of the computer 33. When the TP concentration is greater than or equal to 1 mg / L, increase the reflux ratio of the nitrification solution to 300% to 400%; when the TP concentration is less than or equal to 0.2 mg / L, reduce the reflux ratio of the nitrification solution to 100% to 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 particularly suitable for the deep denitrification and phosphorus removal of newly-built sewage treatment plants and the upgrading and transformation of old sewage treatment plants, and specifically relates to a real-time control device for low C / N sewage energy saving and consumption reduction and based on This enhanced method of nitrogen and phosphorus removal. Background technique [0002] The eutrophication of water bodies caused by excessive discharge of nitrogen and phosphorus is currently one of the environmental issues that the national government and the public are most concerned about. The most fundamental way to control water eutrophication and prevent water pollution is to control pollution sources and control the nitrogen and phosphorus content in the effluent from sewage treatment plants to meet certain discharge standards. The sewage discharge standard issued...

Claims

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Application Information

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Patent Type & Authority Applications(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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