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On-line detection device and detection method for denitrification rate of activated sludge

A technology of activated sludge and detection devices, which is applied in the direction of measuring devices, color/spectral characteristic measurement, and material analysis through optical means, and can solve the problems of controlling processes, operating methods and strategies, and real-time detection and dynamics during process operation. Adjustment and other issues

Active Publication Date: 2018-04-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no instrument dedicated to monitoring the denitrification rate of activated sludge, and there is no method and strategy for regulating process operation based on the denitrification rate.
Some units carry out manual sampling in the laboratory to test the denitrification rate of activated sludge, which is mainly used to evaluate the maximum denitrification capacity of activated sludge, which cannot be used for real-time detection and dynamic adjustment of process operation

Method used

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  • On-line detection device and detection method for denitrification rate of activated sludge
  • On-line detection device and detection method for denitrification rate of activated sludge
  • On-line detection device and detection method for denitrification rate of activated sludge

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Experimental program
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Effect test

Embodiment 1

[0081] Embodiment 1, activated sludge denitrification rate online detection device

[0082] Such as figure 1 As shown, the activated sludge denitrification rate online detection device of the present invention includes a reaction system, a carbon source dosing system, a nitrate nitrogen detection system, a cleaning system, a process control system and a data acquisition and processing system;

[0083] The reaction system includes a bioreactor 1, which is an engineering plastic cuboid container of 450×4500×150mm (LHW), with an effective volume of 20L. The side wall of the bioreactor 1 is sequentially provided with a reaction tank water inlet 2, a reaction tank circulation port 3 and a reaction tank overflow port 4 from bottom to top. The water inlet 2 of the reaction tank is connected to the water inlet solenoid valve 6 through the pipeline (hole / pipe inner diameter 25 mm) provided with the water inlet peristaltic pump 5; the circulation port 3 of the reaction tank is connecte...

Embodiment 2

[0090] Embodiment 2, using the activated sludge denitrification rate online detection device in embodiment 1 to carry out on-line detection of the denitrification rate in the activated sludge in the sewage denitrification process

[0091] A sewage treatment plant adopts the AAO process, with a treatment capacity of 20,000 tons per day. The designed hydraulic retention time is 1.5 hours in the anaerobic section, 3.5 hours in the anoxic section, and 10 hours in the aerobic section. The sludge reflux ratio is 100%, and the mixed liquor reflux ratio is 200%.

[0092] The sewage denitrification process generally includes a pre-anoxic pool and a post-aerobic pool. When the device of the present invention is in use, it is placed at the front end of the anoxic pool, and the sludge in the anoxic pool is collected to measure the denitrification rate. , to transmit the denitrification activity evaluation data to the central control room for the reference of process personnel, the specifi...

Embodiment 3

[0112] Example 3. Using the activated sludge denitrification rate online detection device in Example 1 to conduct online control of the carbon source dosage in the sewage denitrification process

[0113] Such as Figure 4 The process optimization flow chart based on the denitrification rate is shown, and the device in Example 1 can also be used to collect concentration data from the effluent water quality meter, and estimate the removal of nitrate in the anoxic section through process analysis, so as to calculate the carbon source that needs to be added Quantity, control the frequency converter, change the working frequency of the carbon source dosing pump, and add carbon source from the carbon source storage tank to the anoxic pool. The specific operations are as follows:

[0114] (A) Water intake stage: start the sampling peristaltic pump (the rated flow rate is 5L / min, and the effective volume of the bioreactor is 20L), open the sampling solenoid valve, close the circulatio...

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Abstract

The invention discloses an on-line detection device and detection method for activated sludge denitrification rate. The device comprises a reaction system, a nitrate detection system, a process control system and a data acquisition and processing system; the reaction system includes a biological reaction tank; the biological reaction tank is internally provided with a membrane component, the water outlet of the membrane module is connected to a nitrate measuring chamber through a pipeline provided with a produced water suction pump; the nitrate detection system includes a nitrate sensor encapsulated in the nitrate measuring chamber; a nitrate measuring outlet is connected to the biological reaction tank; the process control system includes a programmable logic controller and an intermediate relay set, the programmable logic controller is respectively connected to the nitrate sensor and the intermediate relay set, each intermediate relay is in connection with an inflow water peristaltic pump, an inflow water electromagnetic valve, a circulating electromagnetic valve, an evacuation electromagnetic valve, and a produced water suction pump. The device provided by the invention can realize automatic, continuous and on-line detection of activated sludge denitrification rate, and also can adjust the adding dosage of an external carbon source and asses the denitrification activity.

Description

technical field [0001] The invention relates to an on-line detecting device and a detecting method for the denitrification rate of activated sludge, and belongs to the technical field of sewage biological denitrification. Background technique [0002] Sewage contains high concentrations of nitrogen and phosphorus, which can easily cause eutrophication and other hazards after entering the water environment. Therefore, sewage needs to be treated more thoroughly for nitrogen and phosphorus removal. The traditional biological denitrification process is often used in my country's sewage treatment plants, which has a simple process and stable operation. The principle of biological denitrification process is to convert ammonia nitrogen into nitrate nitrogen through the growth and metabolic activities of microorganisms, and then convert it into nitrogen gas and remove it from water. The former is called nitrification process, which mainly occurs under aerobic conditions and requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/314G01N2021/151G01N2021/155G01N2021/3155
Inventor 邱勇李冰田宇心施汉昌
Owner TSINGHUA UNIV
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