Up-flow anaerobic biological reaction/precipitator used for wastewater treatment

Abstract

The invention discloses an up-flow anaerobic biological reaction / precipitator used for wastewater treatment. The up-flow anaerobic biological reaction / precipitator is rectangular in shape; an integrated structure of the up-flow anaerobic biological reaction / precipitator comprises a reaction zone, a water distribution zone, a settling zone, a water inlet and backflow system, a water outlet system, and a sludge and gas discharge system; the reaction zone is arranged at the lower part of the up-flow anaerobic biological reaction / precipitator; the settling zone is arranged at the middle of the upper part of the up-flow anaerobic biological reaction / precipitator; the bottom of the settling zone is provided with a water distribution / sludge backflow system; the water distribution zone is arranged between the reaction zone and the settling zone; the water inlet and backflow system is arranged in the reaction zone; and the water outlet system is arranged at the upper part of the up-flow anaerobic biological reaction / precipitator and on the diagonal corners. Up-flow reaction conditions can be obtained using the up-flow anaerobic biological reaction / precipitator, and are beneficial for biological reaction process mass transferring; biological reaction efficiency is increased; after biological reaction, wastewater is subjected to precipitation in the integrated settling zone, sludge obtained via precipitation is delivered back to the reaction zone, and it is beneficial for maintenance of microbial biomass.

Description

technical field [0001] The invention relates to the field of waste water biological treatment, and more specifically, relates to an upflow anoxic biological reaction / sedimenter for waste water treatment. Background technique [0002] In wastewater treatment, anoxic biological treatment is a commonly used process, such as hydrolysis, acidification, denitrification and other processes. According to the growth form of microorganisms, it can be divided into two types, biofilm anoxic biological treatment and activated sludge anoxic biological treatment. Oxygen biological treatment, the former type of reactor is filled with fillers for microbial attachment growth, the latter type of reactor has no fillers, and microorganisms grow in the form of sludge flocs or sludge particles. [0003] For the biofilm type anoxic bioreactor, because the anoxic biological reaction does not carry out aeration, the mixing in the reactor must be completed by hydraulic stirring or mechanical stirring....

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Problems solved by technology

[0003] For the biofilm type anoxic bioreactor, because the anoxic biological reaction does not carry out aeration, the mixing in the reactor must be completed by hydraulic stirring or mechanical stirring. Since the filler in the reactor may wrap around the rotating parts, it is difficult to directly use mechanical stirring , hydraulic agitation is mostly used, even so, due to the unevenness of the packing installation, the water flow will pass through the path with sparse packing and small flow resistance, and other areas will become relatively dead water areas. This phenomenon is short circuit of water flow, which makes the actual The hydraulic retention time is greatly shortened. At the same time, the filler in the flow area is sparse and the biomass is small, which seriously affects the treatment effect.

[0004] For sludge-type anoxic bioreactors, submerged mechanical agitation is usually used, and there are also problems in its practical application: first, the inhomogeneity of agitation intensity, the intensity near the agitation machine is high, and the intensity at a distance is small, and the uneven agitation intensity makes The morphology of microorganisms is affected, and it is difficult to form flocs or particles with good sedimentation performance; the second is that microorganisms are difficult to retain. In this type of reactor, the direction of water flow is usually divergent. To achieve a higher concentration of microorganisms in the reactor, it is necessary to It is necessary to set up a sedimentation tank to intercept microorganisms, which requires a relatively large area and a corresponding increase in construction costs

During the operation, it was found that there is a problem of local mud accumulation in the side water inlet and bottom mud discharge settler; the bottom water inlet and bottom mud discharge settler is due to the unbalanced pressure of the bottom water distribution system, resulting in lateral flow of water flow, usually one end of water enters, and the other end Return mud, affect the sedimentation effect

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