Method for monitoring biological treatment oxygen uptake rate of sewage and controlling aeration quantity

A sewage biological treatment, oxygen absorption rate technology, applied in the direction of sustainable biological treatment, aerobic process treatment, flow control using electrical devices, etc., can solve the problems of low measurement frequency, increased equipment investment, small measurement value, etc., to avoid The effect of excessive aeration, excellent control effect and accurate aeration

Active Publication Date: 2014-07-16
江苏美景时代环保科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The intermittent method is to record the value of dissolved oxygen (DO) in the sewage treatment reactor within a certain period of time after the aeration is stopped, and divide the two to obtain OUR. This method has a low measurement frequency and cannot be used as a continuous method. The online monitoring method, and the measured value is generally small; the continuous method is to install a small secondary reactor (or other glass container) next to the main reactor, and the activated sludge mixture is continuously input from the main r...

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  • Method for monitoring biological treatment oxygen uptake rate of sewage and controlling aeration quantity
  • Method for monitoring biological treatment oxygen uptake rate of sewage and controlling aeration quantity
  • Method for monitoring biological treatment oxygen uptake rate of sewage and controlling aeration quantity

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: sequence batch (SBR) activated sludge method

[0035] The specific steps are as follows:

[0036] Step 1: Measure the oxygen transfer coefficient K of aeration and oxygenation under different air flow q (0, 30, 40, 60, 80, 120L / h) and temperature changes L a(d -1 ) and the saturated dissolved oxygen concentration Osat (mg / L), to obtain the oxygen transfer coefficient K L The quantitative relationship between a and gas supply q and temperature T.

[0037] Determination of oxygen transfer coefficient K L The quantitative relationship between a and gas supply q is as follows:

[0038] 1) Continuously aerate the activated sludge in the reactor for more than 12 hours, so that the sludge is in an endogenous respiration state, and keep the sludge concentration stable during the measurement process, so as to avoid the impact of the sludge concentration on K L a and the impact of Osat;

[0039] 2) Stop the aeration for 15 minutes, use the computer data acquis...

Embodiment 2

[0052] Embodiment 2: continuous activated sludge process

[0053] The specific steps are as follows:

[0054] Step 1: Transform the reactor in the SBR implementation case to make it continuously feed water, change the feed water flow rate, make the residence time (HRT) of the continuous reactor be 8 hours, and set up a sedimentation tank with a residence time of 4 hours, the sedimentation tank The sludge reflux ratio is 2. The influent flow is continuously changed based on the 8-hour average residence time to simulate the fluctuation of sewage volume within a day. Oxygen transfer coefficient K in the continuous reactor L The relationship between a and gas supply q is the same as that of SBR reactor, see formula (4).

[0055] Step 2: Estimate the 5-minute period online (T 1 ) within OUR. Provide air flow q to the reactor 1 =10L / h, in the next 5 minutes, use the computer data acquisition system to record the dissolved oxygen concentration at a frequency of once every 10 se...

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Abstract

The invention relates to a method for monitoring the biological treatment oxygen uptake rate of sewage and controlling the aeration quantity. The method comprises the following steps: determining the oxygen transfer coefficient KLa(d<-1>) of aeration oxygenation and the saturated dissolved oxygen concentration mg/L under different air flow q, temperature and preset sludge concentration conditions, finding relation of the oxygen transfer coefficient KLa to the air supply amount q and the temperature T, fitting the dissolved oxygen change curve within a period of time under the preset oxygen transfer coefficient KLa(d<-1>) and dissolved oxygen concentration conditions in order to find the oxygen uptake rate within the period of time, utilizing the oxygen uptake rate of a last period of time as the possible oxygen uptake rate of a next period of time, finding the lowest aeration quantity q of the next period time for reaching the preset dissolved oxygen concentration, applying the above found air quantity q into a reactor within a following period of time, determining the dissolved oxygen change curve of the following period of time, and finding the oxygen uptake rate within the following period of time. The method overcomes the defects of large equipment investment, complex construction, low test frequency and the like existing in the prior art. The method enables OUR (oxygen uptake rate) to be continuously monitored only through using a dissolved oxygen probe without an extra auxiliary reactor, an extra dissolved oxygen probe or a sewage transmission device.

Description

technical field [0001] The invention belongs to a process monitoring and control technology of sewage biological treatment, in particular to a method for monitoring oxygen absorption rate and controlling aeration amount of sewage biological treatment. Background technique [0002] The method of sewage biological treatment is also called activated sludge method. Since the invention of activated sludge method in the early 20th century, it has been the main method of domestic sewage treatment in all countries in the world. It uses active microorganisms to oxidize organic matter and ammonia nitrogen in sewage under the condition of providing dissolved oxygen to achieve the purpose of removal. The supply of dissolved oxygen is usually accomplished by blower aeration. Aeration is the main energy consumption in the sewage treatment process, usually accounting for more than 50% of the energy consumption in the sewage biological treatment process. Therefore, on the premise of ensur...

Claims

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Application Information

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IPC IPC(8): C02F3/02G05D7/06
CPCY02W10/10
Inventor 吴军何成达于林堂蒋新跃周国靖严刚
Owner 江苏美景时代环保科技有限公司
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