Biochemical treatment apparatus for wastewater treatment

Abstract

The invention relates to a biochemical treatment device, which comprises an aerobic aeration zone positioned in the middle of the biochemical treatment device; a reflux guide plate is obliquely and downwards arranged at one side in the biochemical treatment device so as to form a mixed solution reflux zone; the upper end of the reflux guide plate is lower than the water surface of the aerobic aeration zone, and the lower end of the reflux guide plate is provided with a mixed solution reflux slit communicated with the aerobic aeration zone; a sludge zone partition board is obliquely and downwards arranged between the reflux guide plate and the side wall of the biochemical treatment device so as to form a sludge concentration zone; the upper end of the sludge zone partition board is connected with a sedimentation zone partition board, and the lower end of the sludge zone partition board is provided with a sludge reflux slit communicated with the aerobic aeration zone; the upper part of the sludge concentration zone is provided with a solid-liquid separation zone, the upper part of the solid-liquid separation zone forms a clear water zone, and a water collecting device is arranged above the clear water zone; and the bottom of the biochemical treatment device is provided with an aerator which is connected with an air inlet pipe.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a biochemical treatment device for wastewater treatment. Background technique [0002] An important development trend of wastewater treatment at present is the advanced treatment of wastewater to meet stricter discharge requirements and realize the recycling of wastewater. With the development of economy and society, the state and localities have put forward clear standards. For example, the newly promulgated "Code for Design of Industrial Circulating Cooling Water Treatment" GB50050-2007 puts forward clear requirements for reclaimed water as supplementary water for cooling circulating water, among which the Chemical Oxygen Demand (COD) requirement is less than 30mg / l. Biological oxygen demand (Biochemical Oxygen Demand, BOD) is required to be less than 5mg / l; in some places, the COD discharge standard for wastewater has been raised from 300mg / l to 1...

AI Technical Summary

Problems solved by technology

[0006] Existing wastewater biochemical treatment technologies have their own scope of application when they meet different treatment requirements. In the past, most of the goals of wastewater treatment were to meet the discharge standards. Therefore, the differences between various technologies are not too great. Now Some wastewater biochemical treatment processes are mainly various activated sludge methods and various biofilm methods, such as: ordinary activated sludge method, A 2 / O method, oxidation ditch process, SBR process, biological contact oxidation technology, biological aerated filter and other technologies, all of which have the problems of large floor area, low processing load and high energy consumption in operation

At present, the country is vigorously promoting the recycling of wastewater treatment, especially the reuse of reclaimed water in the industrial field has put forward higher treatment requirements for regenerated water quality. The most economical method for the treatment of wastewater COD is to remove it through biochemical treatment. The method of removing COD in the physical and chemical treatment process is not economical, but the existing treatment technology to reduce COD to a very low level requires lower treatment load and longer hydraulic retention time, which will inevitably increase the cost of the project , is also uneconomical

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