Automatic controlling method and cotnroller for treating urban waste water by chemical biological flocculation

Abstract

An automatic control equipment for the biochemical flocculating treatment of city sewage features use of PC for in-line monitor and control to whole treating procedure. Its automatic control method features that the total content of P in output water is used as control target for automatically controlling the amount of added chemical, the in-line DO monitor system is used to automatically control the aeration, and the amount of total suspended particles is monitored for automatically controlling the reflux amount of sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an automatic control method and a device for treating urban sewage by chemical biological flocculation. technical background [0002] With the continuous increase of the global population, the continuous progress of society, and the acceleration of urbanization, the amount of urban sewage has increased dramatically. At present, a large number of urban sewage treatment processes have emerged. The chemical biological flocculation process for urban sewage treatment is a new process with small dosage, strong treatment capacity, and phosphorus removal function on the basis of organic carbon removal. It is very important to adjust the dosing amount reasonably and efficiently according to the working conditions and control the coagulation reaction process. This is also the currently recognized technical difficulty. At present, the commonly used automatic c...

AI Technical Summary

Problems solved by technology

However, this technology has the following problems: (1) This technology controls the coagulation process based on the detection of ξ potential, but it is difficult to accurately measure the ξ potential in the actual processing process, so there is a large error; (2) This technology is used in sampling A layer of particles is formed on the surface of the membrane of the tube, and the update of the surface of the particle membrane directly affects the detection accuracy, which has always been a difficult problem in the application of this technology; It takes tens of minutes to several hours for water to pass through the process, so the use of suspended solids concentration in the effluent to control the dosing amount cannot reflect the relationship between the dosing amount and the suspended solids concentration in a timely and accurate manner; (4) This technology is generally used for water treatment , the upper limit of detecting suspended solids concentration is low, and the concentration of suspended solids in sewage treatment process is very high, so the detection accuracy of this technology for sewage treatment is not high; (5) This technology can reflect the treatment efficiency of the treatment process for suspended solids, but cannot Realize simultaneous control of multiple parameters in the sewage treatment process

However, if this technology is applied to sewage treatment, there are the following problems: (1) This technology is basically applied to the treatment of drinking water from river water purification, and it has a good detection effect on inorganic particles, but the sewage treatment contains a large amount of organic particles, which is difficult to detect (2) The particle size range detected by this technology is narrow, and the particle size detected is uniform, and the particle size dispersion in the sewage treatment process is not easy to detect; (3) This technology has the problem of feedback time lag; (4) This technology It is only limited to the detection of the effect of dosage on suspended solids in the effluent, and cannot satisfy the relationship between dosage and various treatment indicators in the treatment process.

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