Real-time control and method of a2/o-biological contact oxidation device with short-range nitrification coupling denitrification phosphorus removal

A technology of denitrification and phosphorus removal and biological contact, applied in the direction of temperature control, non-electric variable control, control/regulation system, etc., can solve the problems of low efficiency of nitrogen and phosphorus removal and high energy consumption, so as to improve the practicality and The effects of controllability, high biomass and high nitrification efficiency

Active Publication Date: 2016-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low influent C / N, low denitrification and phosphorus removal efficiency, and high energy consumption in the current sewage treatment, the present invention couples two new nitrogen and phosphorus removal technologies and simultaneously introduces a real-time control system to improve the practicability of the device and controllability, providing reference for fine management and efficient operation of actual projects

Method used

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  • Real-time control and method of a2/o-biological contact oxidation device with short-range nitrification coupling denitrification phosphorus removal

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Experimental program
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Effect test

specific Embodiment approach 1

[0028] 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 output of the computer 8 . When NH 4 + When the concentration is ≥5mg / L, increase the aeration rate to 0.3-0.4m 3 / h; when NH 4 + When the concentration is ≤0.5mg / L, reduce the aeration rate to 0.1~0.2m 3 / h.

specific Embodiment approach 2

[0029] 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 output of the computer 8 . When NH 4 + When the concentration is ≥5mg / L, increase the aeration rate to 0.3-0.4m 3 / h; when NH 4 + When the concentration is ≤0.5mg / L, reduce the aeration rate to 0.1~0.2m 3 / h. The temperature sensor 19 and the DO sensor 20 collect the temperature and dissolved oxygen concentration in each compartment of the biological contact oxidation tank 4 online, and obtain real-time control variables through the output of the computer 8 . When the effluent nitrite accumulation rate NO 2 - / NO x - When ≤50%, reduce the dissolved oxygen to 0.5-1.5 mg / L, and at the same time turn on the heating controller 33 to control the reactor temperature at 25-35°C. When the effluent nitrite accumulation rate NO 2 - / NO x - ≤30%, on the basis of the above, change the water inlet of the middle wat...

specific Embodiment approach 3

[0030] 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 output of the computer 8 . When NH 4 + When the concentration is ≥5mg / L, increase the aeration rate to 0.3-0.4m 3 / h; when NH 4 + When the concentration is ≤0.5mg / L, reduce the aeration rate to 0.1~0.2m 3 / h. NO 3 - Sensor 29, NO 2 - The sensor 30 and the TP sensor 31 collect the concentrations of nitrate nitrogen, nitrite nitrogen and total phosphorus in the outlet water tank 6 online, and obtain real-time control variables through the calculation output of the computer 8 . when NO 3 - +NO 2 - When the concentration ≥ 14mg / L or TP concentration ≥ 1mg / L, increase the reflux ratio of the nitrification solution to 300% to 400%; when NO 3 - +NO 2 - When the concentration is ≤6mg / L or TP concentration is ≤0.2mg / L, reduce the reflux ratio of the nitrification solution to 100%-200%.

[0031] Due to the i...

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Abstract

The invention discloses a real-time control system and method of an A<2> / O-biological contact oxidation device for shortcut nitrification coupled denitrifying phosphorus removal. The system comprises a raw water tank, an A<2> / O reactor, an intermediate settling pond, a biological contact oxidation pond, a settling zone, an effluent tank, a real-time control box and a computer. The method comprises the following steps: collecting the temperature and the dissolved oxygen concentration in each cell of the biological contact oxidation pond by a temperature sensor and a DO sensor on line, outputting the temperature and the dissolved oxygen concentration through the computer to realize control on a nitrification process; collecting ammonia nitrogen, nitrate, nitrite and total phosphorus concentration in the effluent tank by an NH4<+> sensor, an NO3<-> sensor, an NO2<-> sensor and a TP sensor on line; outputting through the computer according to the signal collected by each sensor; and adjusting the dissolved oxygen, the aeration rate and the nitrifying liquid reflux ratio. System operation is optimized and the practicability and the controllability of the device are improved through online real-time control equipment, and reference is provided for fine management and efficient operation of practical engineering.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a real-time control device coupled with short-range nitrification and denitrification phosphorus removal technologies and an enhanced nitrogen and phosphorus removal method based on it. Background technique [0002] The eutrophication of water caused by the excessive discharge of nitrogen and phosphorus pollutants has attracted increasing attention. In recent years, many new technologies for nitrogen and phosphorus removal have been developed, among which short-range nitrification and denitrification technology has attracted the most attention. It will The nitrification process is controlled at the stage of nitrite nitrogen production, and denitrification is carried out with nitrite nitrogen as the electron acceptor. Compared with the traditional full-process nitrification and denitrification technology, this technology can not only save 25% of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30G05D23/20
Inventor 彭永臻张淼王聪王淑莹薛晓飞庞洪涛
Owner BEIJING UNIV OF TECH
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