Method and device of automatic control for sequencing batch type treatment process at non-DO state

Abstract

The invention discloses a method and a device of automatic control for sequencing batch type treatment process at a non-DO state. Automatic control of the sequencing batch type treatment process independent of DO value is realized by steps: acquiring flow-in water quality parameter and water inlet quantity parameter in real time, transmitting the flow-in water quality parameter and water inlet quantity parameter and flow-out water quality parameter in the last period to an automatic aeration control device, and obtaining each parameter of the flow-in water treatment process after automatic computation of preset procedures of the automatic aeration control device. The acquired flow-in water quality parameter and the water inlet quantity parameter are combined with the flow-out water quality parameter in the last period to be used as main treatment parameters of the automatic control device to obtain ideal operating parameters, the DO value can be the designed value stably, and thereby the requirements of sewage treatment can be met while operating state of a fan can be more reasonable, energy consumption is reduced, the automatic control way can be independent of the DO state, and the problems of traditional control methods are avoided. Further, the automatic control method and a device for sequencing batch type treatment process at the non-DO state is evidently reduced in energy consumption and reduces more than 15%-35% of energy consumption as compared with the existing automatic control method.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an automatic control method and device for a sequence batch treatment process in a non-DO state. Background technique [0002] At present, in the sequence batch treatment process, the aeration stage is the most important process link in the entire sequence batch treatment process, and the control of the aeration air volume is mainly completed by the control system. The treatment goal of sequencing batch SBR is to oxidize and remove dissolved or tiny free suspended matter. Oxidation reaction in SBR is completed through biological oxidation of microorganisms. Therefore, whether microorganisms can effectively convert suspended substances into solids and precipitate them is the key to the normal operation of SBR. Oxygen is necessary for microorganisms to oxidize organic matter to obtain energy for growth; insufficient oxygen will reduce the activity of aerobic bacteria; the growth of...

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Problems solved by technology

[0003] However, the current control method has the following problems: First, because the current process omits the pre-tank of the aeration reaction tank, the sewage directly enters the aeration reaction tank, so the flow of sewage is usually changing, not a constant flow , depending on the time period, the amount of aeration required is also different

In the current automatic control method, the flow rate is calculated in a constant manner, and the start time and end time of the fan are fixed. Therefore, in the process of changing the sewage flow rate, it may lead to waste or insufficient aeration; Secondly, there is a lag in the feedback information of the DO value. After the air enters the sewage, it takes a certain reaction time to form DO. Therefore, it is inaccurate to determine the operating status of the fan based on the feedback information of the DO value.

These problems will lead to inaccurate control of aeration volume, and the aeration process is the link with the most energy consumption, and its energy consumption is equivalent to 50% of the total energy consumption. Therefore, the current control method is quite unfavorable for energy saving.

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