Internal-mixing anaerobic reaction tank

Abstract

The invention provides an internal-mixing anaerobic reaction tank. A tank body is of a column shape, and a cone-shaped sludge bulking region, a reaction region, a gas-solid-liquid separation region and a precipitation separation effluent region are sequentially arranged in the tank body from bottom to top; and the cone-shaped sludge bulking region is a cone-shaped cover, an effluent weir is arranged above the precipitation separation effluent region, an automatic return-flow system is arranged at the top of the tank body and comprises an air lifting pipe, an air-water separation tank and a return pipe, the air lifting pipe is connected with the cone-shaped sludge bulking region and the air-water separation tank, the return pipe stretches into the lower part of the reaction region, a sewage gas pipe is connected between the air-water separation tank and the gas-solid-liquid separation region, and a sewage gas circulating pipe is connected between the air-water separation tank and a water distribution pipe. The internal-mixing anaerobic reaction tank has the advantages that the tank body is low in height, the tank can be started quickly by flocculent sludge with high shock load resistance, the requirement on a Ph value of inflow water is low, granule sludge increases quickly, the processing energy consumption is low, the processing efficiency is high, the effluent quality is stable, and the tank is suitable for processing of organic pollutants in various concentrations, simple to operate and convenience to run.

Description

Technical field [0001] The invention relates to an anaerobic reaction device used in the biochemical treatment stage of industrial sewage treatment, and belongs to the technical field of anaerobic reaction. Background technique [0002] Various anaerobic reactors used at this stage can be classified as high, medium and low speed reactors. Anaerobic reactors with a height of less than 10 meters and a rising flow rate between 0.5-1.0 m / h are classified as medium-speed anaerobic reactors. The COD volume load of medium-speed anaerobic reactors is usually less than 5kgCOD.m3.d. Start and Flocculent sludge can be used during operation. The medium-speed reactor has a moderate floor space, low investment, and convenient operation, but the disadvantage is that it cannot be used for high-concentration water quality and poor biochemical sewage, and the anaerobic sludge of the system is easy to lose. The high-speed anaerobic reactor is represented by IC characterized by the granular sludge...

AI Technical Summary

Problems solved by technology

The medium-speed reactor covers a moderate area, saves investment, and is easy to operate, but the disadvantage is that it cannot be used for high-concentration water quality and sewage with poor biochemical properties, and the anaerobic sludge in the system is easy to lose

The high-speed anaerobic reactor is represented by the IC characterized by the granular sludge reaction bed system. Its HRT (hydraulic retention time) is short and the volume load is high. Usually the COD volume load is greater than 5kgCOD.m3.d, but the startup and operation must use granular For sludge, the height-to-diameter ratio is usually required to be more than 2:1, and the ascending flow rate is required to be more than 1m / h, and the growth of granular sludge is slow, so fresh granular sludge needs to be replenished frequently

Images