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Denitrification filter backflushing precise control device and operating method

A control device and backwashing technology, which is applied in the direction of chemical instruments and methods, filtration treatment, special treatment goals, etc., can solve the problem that it is difficult to ensure the scientific denitrification of the backwashing strategy and the rapid recovery of the filtration function, shorten the operation period of the filter tank, increase the Operating costs and other issues, to solve the backwash intensity and time is difficult to grasp and judge, restore denitrification and filtration functions, and reduce energy consumption

Active Publication Date: 2018-05-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: in view of the existing biofilter technology for denitrification, the growth and reproduction of the microorganisms themselves and the suspended solids and dissolved oxygen in the influent can easily lead to blockage of the anoxic filter, shorten the operating cycle of the filter, and increase the operating time. cost, and the current backwashing schemes are mostly determined based on experience and turbidity of influent and effluent water, it is difficult to guarantee the scientificity of the backwashing strategy and the rapid recovery of denitrification and filtration functions after backwashing. The precision flushing control device and operation method can effectively reduce the energy consumption of the filter on the basis of ensuring that the denitrification and filtration functions of the filter can be restored in the shortest time after backwashing. The structure is simple and the operation is convenient

Method used

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  • Denitrification filter backflushing precise control device and operating method
  • Denitrification filter backflushing precise control device and operating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 A denitrification filter backwash precision control device shown in the figure includes a regulating tank 2, a denitrification filter 14, a clear water tank 11, a dosing device 1, an inlet pump 3, an in-situ detection sensor 6, an electrode cable 7, Backwash water inlet pump 12, backwash air pump 13, backwash water outlet 15, electrochemical workstation 16, computer 17, process controller 18; Pipeline connection, the dosing pipe of the dosing device 1 extends into the regulating pool 2, the denitrification filter 14 is a columnar structure, and the denitrification filter 14 includes a uniform water distributor 4, The filter material layer 5, the support layer 8 and the filter brick 9, and the uniform water distributor 4 are composed of graded water distribution devices, which are respectively composed of the water inlet main pipe, the main pipe, the branch pipe and the water distributor with uniform distribution of water distribution holes; the filter m...

Embodiment 2

[0041] The difference from Example 1 is that the in-situ detection sensor 6 is placed in the quartz sand packing layer, located 40 cm below the surface of the quartz sand filter material, and is a hollow cylinder with a diameter of 7 cm, a height of 7 cm, and a thickness of 0.5 cm. It is high-density polyethylene or polypropylene, and the in-situ detection sensor 6 is pasted with a platinum sheet on the inner wall, which is 2.5cm long and 2.5cm wide. The platinum sheet is connected to the electrochemical workstation 16 through a wire 7, and the electrochemical workstation 16 passes The connection line is connected with the computer 17, and the computer 17 is equipped with control software corresponding to the electrochemical workstation 16.

[0042] Hydraulic load 1m 3 / m 2 h, plus COD / N=3-4, the water quality parameters of sewage treated by this device and method change: influent COD 72-95mg / L, TN 18-26mg / L, TP 0.68-0.81mg / L, SS 19- 34mg / L, NO 3 -N 16-20mg / L; effluent COD ...

Embodiment 3

[0044] With embodiment 1, the difference is that the in-situ detection sensor 6 is placed in the quartz sand filler layer, located 50 cm below the surface of the quartz sand filter material, and is a hollow cylinder with a diameter of 10 cm, a height of 10 cm, and a thickness of 0.6 cm. The material is high-density polyethylene or polypropylene, and the in-situ detection sensor 6 is pasted with a platinum sheet on the inner wall, which is 3 cm long and 3 cm wide. The platinum sheet is connected to the electrochemical workstation 16 through a wire 7, and the electrochemical workstation 16 is connected to The line is connected with the computer 17, and the computer 17 is equipped with control software corresponding to the electrochemical workstation 16.

[0045] Hydraulic load 1m 3 / m 2 h, plus COD / N=5-6, the water quality parameters of sewage treated by this device and method change: influent COD 104-141mg / L, TN 18-26mg / L, TP 0.68-0.81mg / L, SS 19- 34mg / L, NO 3 -N 16-20mg / L; ...

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Abstract

The invention discloses a denitrification filter backflushing precise control device and an operating method. The device comprises a regulating tank, a denitrification filter, a clear water tank, a doser, an in-situ detection sensor, an electrochemical workstation, a computer, a backflushing air pump, a backflushing water pump and a process controller, and the process controller is in signal connection with the computer. The operating method for the denitrification filter backflushing precise control device comprises the following steps that 1, the in-situ detection sensor is prepared and placed on a filter layer; 2, filter electrical impedance data is detected to conduct model fitting and parameter determination; 3, backflushing is conducted, and the backflushing is stopped when the filter electrical impedance returns to a number range of a second stage. According to the denitrification filter backflushing precise control device and the operating method, energy consumption of the denitrification filter can be effectively reduced on the basis that functions of denitrification and filtering of the filter can be recovered in the shortest time after the backflushing.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a precise control device and operation method for backwashing of a denitrification filter. Background technique [0002] At present, the secondary effluent of sewage treatment plants often contains a certain amount of nitrate nitrogen, phosphorus, and suspended solids. Direct discharge into rivers and lakes will cause excessive accumulation of nutrients in the water body, and even cause algal blooms, etc., which are harmful to the ecological environment and human beings. A major threat has arisen. In recent years, the country has continuously improved the discharge standards of urban sewage, and various regions have successively issued a series of policies and plans for energy conservation and emission reduction. 2002), the first-class A standard has higher requirements for the treated effluent of sewage plants. Therefore, there is an urgent need to carry out techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/001C02F3/02C02F3/34C02F2303/14C02F2201/007
Inventor 黄辉马思佳任洪强
Owner NANJING UNIV
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