A control system and method for optimizing the denitrification process of sewage treatment in villages and towns with low carbon-to-nitrogen ratio

Abstract

The invention belongs to the technical field of waste water biological treatment and particularly relates to a system and a method for controlling an optimized denitrification process in low-carbon-nitrogen-ratio rural waste water treatment. The system and the method can be used for real-time control over a biological denitrification process and optimize operation parameter, is efficiency, low inconsumption, simple, easy to implement and suitable to be used for dispersed rural waste water on-site treatment in medium and small town and rural areas. In the invention, DO (dissolved oxygen) and ORP (oxidation-reduction potential) are used as control parameters, the DO value and ORP value are detected in real time, dynamic data are transmitted to a computer, a control policy is made accordingto the correspondence between the pollutant concentration obtained by using test data and control parameter values, the computer analyzes the acquired data according to the control policy and feeds the result back to a programmable logic controller ( PLC) control cabinet, the PLC control cabinet corrects the operation parameters, and thus, the optimized control over the biological denitrificationprocess is realized and the total nitrogen content in the effluent and operation cost are both reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to a control system and method for optimizing the denitrification process of sewage treatment in villages and towns with a low carbon-to-nitrogen ratio, which performs real-time control on the biological denitrification process, optimizes operating parameters, is efficient and low-consumption, and is simple and easy to implement. It is suitable for on-site treatment of scattered village sewage in small and medium-sized towns and rural areas. Background technique [0002] In today's society, the ecological water environment is deteriorating day by day, and the problem of eutrophication is particularly prominent. The essence is that the concentration of nutrient elements in the receiving water body exceeds the self-purification ability of the environment. Nitrogen is the main nutrient element that causes eutrophication. How to detoxify the discharged wate...

AI Technical Summary

Problems solved by technology

[0004] However, with the improvement of the living standards of residents in rural areas, the composition of domestic sewage in scattered villages and towns has gradually changed from high organic matter concentration to low carbon-to-nitrogen ratio. The amount of carbon source required for denitrification in the traditional biological denitrification process is limited. Therefore, how to maximize Utilizing the raw water carbon source and improving the denitrification rate without an external carbon source has become a major difficulty in rural sewage treatment. There is currently no effective control system for the integrated device using an anaerobic filter-contact oxidation coupling process. To achieve optimal denitrification, it is urgent to form a simple and feasible optimized denitrification process control system and method, using real-time monitoring parameters to effectively indicate the operation effect of the treatment device, carry out signal transmission, information processing, and device feedback, while ensuring denitrification save running cost

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