Sewage aeration control method based on oxygen transfer efficiency
A technology of transfer efficiency and sewage aeration, applied in water aeration, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of DO value lag, affecting effluent quality, energy saving and consumption reduction, etc. The effect of energy consumption, reduction of adjustment frequency, and stable energy saving and consumption reduction
Active Publication Date: 2022-04-08
安徽泛湖生态科技股份有限公司
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Problems solved by technology
Due to the continuous change of sewage water quality and quantity during operation, in order to achieve the DO target value, it is necessary to frequently adjust the air volume of the fan and the opening of the aeration valve, which often causes a hysteresis phenomenon of the DO value, affecting the effluent water quality and energy saving and consumption reduction
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[0066] Aeration system characteristic parameter C S 8.6mg / L, V 840m 3 , experimental testing of the aeration system, KLa 0 、Gs 0 and the MLSS data series as:
[0067] KLa 0 =[3.14 3.32 5.71 3.87 5.84 4.26 4.13 4.6 5.24 5.61], unit h -1 ;
[0068] Gs 0 =[398.7 425.6 663.8 463.8 713.6 452.7 523.6 567.2 603.3 781.3], unit m 3 h -1 ;
[0069] MLSS=[3677.4 3693.2 3546.7 3534.2 3647.5 3411.1 3722.5 3517.6 3462.43823.4], unit mg L -1 ;
[0070] KLa 0 with Gs 0 And the fitting relationship of MLSS (95% confidence interval) is:
[0071] KLa=f(Gs 0 ,MLSS)=8.996+0.007861×Gs 0 -0.002448×MLSS
[0072] Dissolved oxygen set concentration range [1.0, 2.0] (unit mg / L), aeration volume adjustment range [300, 800] (unit m 3 / h), the theoretical maximum value of oxygen transfer efficiency (OTE maxTheory ) is 23%, the target oxygen transfer efficiency coefficient k is 0.8, and the target oxygen transfer efficiency is k×OTE maxTheory =18.4%, set the data collection period as 10mi...
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The invention relates to a sewage aeration control method based on oxygen transfer efficiency, which comprises the following steps of: performing aeration test on a sewage aeration system needing to be controlled, and completing initialization of characteristic parameters and control parameters of the aeration system; collecting the actual oxygen transfer efficiency (AOTE), the aeration rate Gs0, the dissolved oxygen concentration DO and the total suspended solid concentration MLSS of the aeration system; calculating the real-time oxygen uptake rate (OUR) of the sewage; when the DO exceeds a set range, calculating a target aeration rate Gstart by using the OUR; when the DO value is in a set range and the OTE is lower than a set target, an OTE optimization algorithm is adopted, the balance of the oxygen supply rate and the oxygen consumption rate is used as a limiting condition, an oxygen transfer efficiency OTE optimal control point is obtained in a dissolved oxygen set range and an aeration rate adjusting range, and Gstarget is obtained; and adjusting the flow of the fan and the valve opening of the aeration pipe according to the Gstart. According to the invention, by adjusting the aeration rate, the OTE is controlled to be above a target value, so that the dissolved oxygen is controlled in a reasonable area, and stable aeration, energy conservation and consumption reduction are realized.
Description
technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage aeration control method based on oxygen transfer efficiency. Background technique [0002] Based on the present, the blast aeration control method commonly used in the field of sewage treatment is based on setting the DO target value of dissolved oxygen concentration, by adjusting the air volume of the fan, the opening of the aeration valve and the aeration time. Due to the continuous change of sewage water quality and quantity during operation, in order to achieve the DO target value, it is necessary to frequently adjust the air volume of the fan and the opening of the aeration valve, which often causes a hysteresis phenomenon of the DO value, affecting the effluent water quality and energy saving and consumption reduction. [0003] However, in the blast aeration process of sewage treatment, there is another key parameter to measure the working condition of the...
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IPC IPC(8): C02F7/00
CPCY02W10/10
Inventor王淦郭洪瑞朱奥叶勇方兴陈俊孙长远
Owner安徽泛湖生态科技股份有限公司