Biochemical treatment system and method for sulfur-containing printing and dyeing wastewater

Abstract

The biochemical treatment system comprises an aerobic tank, a middle sedimentation tank and an anaerobic tank which are connected in sequence, the aerobic tank is of an open container structure, an aeration channel is formed in the middle of the aerobic tank, an aerator is arranged at the bottom of the aeration channel, an aerobic tank water distribution pipe is laid at the bottom of the aerobic tank, and the middle sedimentation tank and the anaerobic tank are connected in sequence. The middle of the aerobic tank is filled with aerobic filler, the anaerobic tank is of a closed container structure, an anaerobic tank water distribution pipe is laid at the bottom of the anaerobic tank, the middle of the anaerobic tank is filled with anaerobic filler, a water outlet pipe at the top of the aerobic tank is connected with the middle sedimentation tank, and a sludge return pipe connected with the aerobic tank is arranged at the bottom of the middle sedimentation tank. According to the invention, the MBF filler and the anaerobic reactor are intensively combined, and the synchronous and efficient nitrogen and sulfur removal method based on the sulfur autotrophic denitrifying bacteria is established effectively aiming at sulfides, nitrogen compounds and a small amount of organic matters which are difficult to treat in wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a biochemical treatment system and method for sulfur-containing printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater is a kind of industrial wastewater that is extremely difficult to treat. For sulfur-containing printing and dyeing wastewater, most of the existing processes are based on a combination of physicochemical and biochemical processes. The sulfur removal methods mainly include methods such as ferrous precipitation, aeration or oxidant oxidation, and then combined with biochemical processes for denitrification. The method of physicochemical dosing and desulphurization has problems such as high pharmaceutical cost and large amount of mud produced. The physicochemical + biochemical combined biochemical process has problems such as long process and large area. [0003] Among them, the widely recognized metabolic pathways...

AI Technical Summary

Problems solved by technology

Therefore, in the existing relatively mature biochemical denitrification process, in the process of treating most of the actual wastewater with a low carbon-to-nitrogen ratio, a large amount of necessary carbon sources (organic substances such as glucose, methanol, alcohol, etc.) are added to meet the stable operation of the process. Effect requirements have become a conventional method, which will inevitably increase the process operation cost of sewage and wastewater treatment

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