Magnetic activated sludge reactor and method for realizing short-cut denitrification

Abstract

A magnetic activated sludge reactor and a method for realizing short-cut denitrification belong to the field of wastewater treatment. The reactor is provided with a water inlet pipe, a water outlet pipe, a dredge pipe, and a stirring device which is used for fully mixing wastewater and magnetic activated sludge, the bottom of the reactor is provided with a microporous aeration disc, and a gas flowmeter is arranged between the microporous aeration disc and an air blower; dissolved oxygen DO, an oxidation-reduction potential ORP and a pH electrode are installed on the inner wall of the reactor, and a display controller, a PID (proportion integration differentiation) controller and a computer are installed on the outer side of the reactor. The method for realizing short-cut nitrification comprises the following steps that: under the condition that MLSS (mixed liquor suspended solids) is equal to 13,000mg / L, an aeration control strategy is based on the PH value; and the online control runs automatically. The reactor and the method provided by the invention are applicable to municipal wastewater treatment plants and other wastewater treatments of breeding wastewater, monosodium glutamate wastewater, coking wastewater and the other nitrogen-containing organic industrial wastewater treatment, aim at energy and consumption reduction, and have the advantages that the operation management is simple, manpower and material resources can be saved, the denitrification rate is high, reaction volume is smaller, sludge production is lower and the cost on sludge treatment and disposition can be effectively reduced, and the like.

Description

technical field [0001] The invention relates to a magnetically active sludge reactor and a method for realizing biological short-range denitrification, which is suitable for deep denitrification of domestic sewage and industrial wastewater in large, medium and small cities, and belongs to the field of sewage treatment. Background technique [0002] The traditional activated sludge method is widely used in urban and industrial sewage treatment processes. However, there are generally problems such as high sludge yield and low C / N ratio in sewage, which lead to unsatisfactory nitrogen removal efficiency. Moreover, the cost of treatment and disposal of a large amount of excess sludge discharged often accounts for more than 60% of the operating cost of the entire sewage plant. Therefore, how to reduce the output of excess sludge from the conventional activated sludge process and solve the problem of biological denitrification for sewage with low carbon-to-nitrogen ratio has beco...

AI Technical Summary

Problems solved by technology

2. Low sludge yield

[0005] The combination of magnetic activated sludge method and short-range denitrification not only achieves low sludge yield, but also reduces energy consumption and saves operating costs. However, there is no report on the realization of short-range biological denitrification in magnetic active sludge reactors.

The main reason why the nitrogen content of urban sewage plants in my country is difficult to meet the standard is that the denitrification carbon source is insufficient, and the low carbon-nitrogen ratio of the influent is low.

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