Automatic control method for aerobic aeration of landfill leachate

Abstract

The invention discloses an automatic control method for aerobic aeration of landfill leachate. The method comprises steps as follows: the current dissolved oxygen concentration in an aerobic reactiontank is acquired; the concentration deviation E between the given dissolved oxygen concentration value and current dissolved oxygen concentration value and the concentration deviation change rate EC are acquired; the fuzzed concentration deviation E and the fuzzed concentration deviation change rate EC are used as inputs for fuzzy control, and deltakp, deltaki and deltakd are used as outputs for fuzzy control; a deltakp, deltaki and deltakd fuzzy control rule list is formulated; according to the fuzzy control rule list, increment parameters deltakp, deltaki and deltakd for PID regulation are calculated, and kp, ki and kd for the final PID control program are determined through selection of the increment parameters; and the fan frequency is obtained by a PID regulator according to the kp value, the ki value and the kd value and is input into a frequency converter, so that the frequency is regulated automatically. With the method, the fan frequency can be regulated automatically, so thatthe dissolved oxygen concentration can be regulated; and self-revision of the PID parameters can be realized, so that the shock resistance of the automatic control program can be enhanced.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to an automatic control method for aerobic aeration of garbage leachate. Background technique [0002] The current mainstream treatment process of landfill leachate is mainly as follows: landfill leachate enters the adjustment tank for storage after filtration and sedimentation, and is pumped into the anaerobic reaction system through the inlet pump to degrade most of the organic pollutants (ie COD), and the effluent enters the waste water. The oxygen reaction pool and the aerobic reaction pool further remove COD, ammonia nitrogen and other pollutants, and finally pass the advanced treatment of the ultrafiltration system and the reverse osmosis system to meet the discharge index. When the sewage enters the aerobic reaction pool, an important control index is the pool. The dissolved oxygen concentration is generally required to be 2-4mg / L. If it is too low, the pollutants w...

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Problems solved by technology

[0004] (1) Manual operation increases the operating frequency of workers, which requires high operating level and experience of workers, which is not conducive to reducing the workload. At the same time, due to the large range of manual adjustment of the fan frequency, it is difficult to achieve long-term stability, resulting in fluctuations in the operating current of the fan Larger, resulting in higher energy consumption of the Roots fan, which is not conducive to energy saving;

[0005] (2) The manual operation cannot be continuously controlled, so that the dissolved oxygen will fluctuate, and the fluctuation of dissolved oxygen will lead to the instability of the reaction process, affect the treatment effect, and cause the effluent index to fail to meet the standard

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