Control device and method for four-section water-feeding A/O technique water-feeding flow rate distribution process

A technology of influent flow and process control, which is applied in the field of nitrogen-containing industrial wastewater treatment and urban domestic sewage biological treatment, and the automatic control field of activated sludge wastewater treatment system, which can solve the problems of waste and poor denitrification effect, and achieve full improvement Use, avoid waste of carbon sources, and improve the effect of TN removal

Active Publication Date: 2008-03-19
BEIJING UNIV OF TECH
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Problems solved by technology

After adopting the distribution method and process control device, it can ① solve the problem of poor denitrification effect of the constant flow distribution system ② make full use of the carbon source in the raw water for denitrification, avoiding the waste of carbon source ③ reduce operating costs while improving Processing effect ④ Process control structure is simple, easy to implement and operate

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  • Control device and method for four-section water-feeding A/O technique water-feeding flow rate distribution process

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Embodiment Construction

[0030] In conjunction with embodiment, the running operation of process of the present invention is described

[0031] The actual domestic sewage discharged from a family area of ​​a university was used as the experimental object (COD=250~350mg / L, NH 4 + -N=20~80mg / L). The multi-stage water-influent A / O biological denitrification reactor used dissolves 320L and is divided into 4 sections, each with a volume of 80L. The system is equipped with 1 air compressor, the maximum air volume is 8m 3 / h, the minimum air volume is 0. The reactor is first subjected to sludge cultivation and domestication. After the domestication, the sludge concentration in each section is: 5-5.5g / L in the first section, 4-4.5g / L in the second section, and 2.8-3.2g / L in the third section. L. The daily water treatment capacity of the reactor is 960L, and the reaction temperature is 20°C.

[0032] Firstly, the α value of domestic sewage used in this test is determined to be 7 through experiments.

[...

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Abstract

A control device and method for the influent flow distribution of the four-step water intake A / O process belongs to a sewage treatment system area by using an activated sludge method. The operation of a prior step feed process can not optimize the flow distribution according to the influent quality; the system can not fully utilize the nitrification and denitrification capacity of each step, and the carbon source in the influent can not be fully utilized during the denitrification process; the operation cost of the prior step feed process is high with a poor processing effect. The control device and method for the influent flow distribution of the four-step water intake A / O process of the invention inputs the on line collected ammonia nitrogen and COD signals into an influent flow distribution controller; the output of the flow regulation signal acts on a frequency conversion speed governor of a water intake pump of each step after the rule and algorithm, and regulates the influent flow distribution of the system of each step. The invention can improve the nitrification and denitrification effect of the step feed process and fully utilizes the carbon source in the influent during the denitrification process. The operation cost of the invention is low with good effluent effects and a simple control structure. The invention is easy to be realized.

Description

technical field [0001] The invention relates to a process control device and method for biological denitrification process of sewage, which belongs to the theory, method and technical field of automatic control of activated sludge sewage treatment system, and is suitable for the treatment of nitrogen-containing industrial waste water and the biological treatment of urban domestic sewage. Background technique [0002] The problem of eutrophication is one of the most important water pollution problems faced by countries in the world today, and the excessive discharge of nitrogen and phosphorus is the main cause of eutrophication. In order to solve the increasingly serious water pollution problem, my country has increased the maximum allowable discharge concentration of total nitrogen and total phosphorus in the newly promulgated "Pollutant Discharge Standards for Urban Sewage Treatment Plants" in 2002, and also put forward stricter requirements for effluent ammonia nitrogen , i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 彭永臻王伟王淑莹孙亚男
Owner BEIJING UNIV OF TECH
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