Method for improving activity of nitrification function microbiology in activated sludge through feeding iron hydroxide during in situ preparation

Abstract

Provided is a process for increasing the activity of a nitrification microorganism in an active sludge by in-situ preparation and addition of iron hydroxide, comprising a culturing stage for a nitrification microorganism and a long-term activity-maintaining stage, wherein the culturing stage is for increasing the activity of the nitrification microorganism by in-situ preparation and addition of ultra fine particles of iron hydroxide at a mass concentration of 10% in an active sludge system facility, the in-situ preparation being achieved by chemically reacting iron trichloride solution at a mass concentration of 15% and with a 2.6% sodium hydrogen carbonate solution under mixing and stirring in a centrifugal pump, and the long-term activity-maintaining stage involving adding a chemical reagent of an iron salt directly to the active sludge mixture solution, in order to supplement the iron element lost by discharging the remaining sludge. The process improves low temperature resistance of a biological denitrogenation system.

Description

technical field [0001] The invention relates to a method for improving the nitrifying ability of nitrifying microorganisms in activated sludge used for sewage biological denitrification treatment under low temperature conditions, and belongs to the technical field of sewage treatment. Background technique [0002] Activated sludge method is a biological treatment method of sewage, which removes organic matter in sewage through microorganisms in activated sludge, and simultaneously removes a part of phosphorus and nitrogen. The traditional activated sludge sewage biological treatment system is composed of an aeration tank (aerobic tank), a sedimentation tank, a sludge return system and an excess sludge removal system. Continuous mixed culture is carried out to form activated sludge, and the microbial coagulation, adsorption and oxidation in activated sludge are used to decompose and remove organic pollutants in sewage. Then the sludge and water are separated, and most of the...

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Problems solved by technology

[0008] Aiming at the influence of low temperature conditions on the activity of nitrifying functional microorganisms, the present invention provides a method for on-site preparation and dosing of ferric hydroxide to improve the activity of nitrifying functional microorganisms in activated sludge. The sludge system (sewage biological denitrification system) is used to improve the activity of nitrifying microorganisms, which can effectively solve the problems of poor operational stability and the impact of low temperature on the activity of nitrifying microorganisms in the existing sewage biological denitrification system, and improve the nitrifying microorganisms. Biochemical reaction activity, improve the ability of biological denitrification system to resist low temperature

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