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A method for automatic control of dissolved oxygen concentration in wastewater biological treatment system

A technology of automatic control and dissolved oxygen concentration, applied in the field of sewage treatment, can solve the problems of manual control and poor control effect, and achieve the effect of improving efficiency, avoiding frequent start and stop, and saving labor.

Active Publication Date: 2016-10-05
中化学朗正环保科技有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for automatically controlling the dissolved oxygen concentration of a wastewater biological treatment system, which solves the technical problem that the existing DO control systems are all manually controlled, and the control effect is relatively poor, improves the water quality of the effluent, reduces energy consumption and Labor cost, labor saving

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  • A method for automatic control of dissolved oxygen concentration in wastewater biological treatment system
  • A method for automatic control of dissolved oxygen concentration in wastewater biological treatment system

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Effect test

Embodiment 1

[0050] The method for automatically controlling the dissolved oxygen concentration of a wastewater biological treatment system of the present invention is used to control the dissolved oxygen concentration of a sewage treatment plant in Tianjin.

[0051] A sewage plant in Tianjin adopts the Aubert oxidation ditch process as the main treatment process of the biological system. It is divided into three ditches: outer, middle and inner. The surface aeration equipment is 4 groups of 8 rotary disc aerators. Each group of middle ditch and inner The groove rotating disc is controlled by a rotating disc motor, that is, it starts and stops at the same time, and each group of outer groove rotating discs is controlled by a single rotating disc motor. A dissolved oxygen meter is installed in the inner ditch of the oxidation ditch. The factory stipulates that the dissolved oxygen concentration in the reaction pool should be controlled between 2-4mg / L, that is, the upper limit is 4mg / L and ...

Embodiment 2

[0063] The method for automatically controlling the dissolved oxygen concentration of a wastewater biological treatment system of the present invention is used to control the dissolved oxygen concentration of a certain sewage treatment plant.

[0064] The combined integrated oxidation ditch of a sewage plant uses rotary brush aerators as aeration equipment. The oxidation ditch is a single ditch type, and there are 5 rotary brush aerators in total. A dissolved oxygen meter is installed in the inner ditch of the oxidation ditch. The factory stipulates that the dissolved oxygen concentration in the reaction pool should be controlled between 1.5-3mg / L, that is, the upper limit is 3mg / L and the lower limit is 1.5mg / L.

[0065] Step 1, classify the combination of different dissolved oxygen control equipment

[0066] Firstly, the operation of the equipment and the adjustment of dissolved oxygen were carried out through manual control within half a year, and the running time of diffe...

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Abstract

The invention discloses a method for automatically controlling the dissolved oxygen concentration of a biological wastewater treatment system. Operation data of dissolved oxygen control equipment in the manual dissolved oxygen controlling process serve as a basis, the basic principles of mathematical statistics and probability theory are applied, the dissolved oxygen control methods of the biological system are screened and concluded to be classified into multiple types in a stair mode to correspond to different dissolved oxygen control equipment compositions respectively, the corresponding relations are input into a center control system, and therefore the center control system can automatically control the corresponding dissolved oxygen control equipment composition to start and close according to the detected dissolved oxygen concentration and adjust the dissolved oxygen concentration within the range of upper limit and lower limit.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for automatically controlling the dissolved oxygen concentration of a waste water biological treatment system. Background technique [0002] Most domestic sewage treatment plants adopt biological treatment systems, and biological treatment systems usually involve multiple operating parameters, including sludge concentration (MLSS), dissolved oxygen concentration (DO), sludge reflux ratio, hydraulic retention time (HRT) and Sludge age (SRT), among all the control parameters involved in the biological system, DO is the most important control parameter, and it is also the most difficult operating parameter to control. [0003] In the biological treatment system, in addition to the pure anaerobic treatment system, it is usually divided into anaerobic, anoxic, and aerobic parts. The anaerobic and anoxic parts are easier to meet because they do not set or set a small amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 李文英李诚李辰刘玉玲李怀恩魏红贾斌凯
Owner 中化学朗正环保科技有限公司
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