P-MBR biochemical treatment system and process

Abstract

The invention relates to a P-MBR biochemical treatment system and process; the P-MBR biochemical treatment system comprises a mixing zone, an adsorption flocculation zone, a biochemical reaction zone, a settling zone, and a membrane filtration zone; the mixing zone is used for waste water introduction, active filling material addition, and preliminary mixing of waste water to be treated with newly-added filling materials; the adsorption flocculation zone is used for accommodating and adsorbing the waste water mixed in the mixing zone, and retaining the waste water for a while for full combination of harmful substances in the waste water with the active filling materials so as to generate flocculation; the biochemical reaction zone is used for receiving the waste water reacted in the adsorption flocculation zone, and allowing the waste water and the active substances to fully react in the biochemical reaction zone; the settling zone is used for precipitating the waste water after biochemical reaction in the zone to obtain precipitates in the mixed liquid so as to separate clear liquid; the membrane filtration zone is used for filtering the clear liquid formed in the settling zone, and extracting the purified water formed after filtration. The invention provides the water treatment system and the process with stable operation and simple process flow.

Description

technical field [0001] The invention relates to a sewage treatment system and a process, in particular to a P-MBR biochemical treatment system and a process. Background technique [0002] The sewage treatment in the prior art generally adopts a biochemical treatment process, and the pollutants in the sewage are removed through the biochemical reaction of microorganisms. However, when the concentration of pollutants in the sewage is relatively low or the nature of the pollutants is very stable and difficult to degrade, or when the water contains toxic substances or substances that inhibit microbial biological activity, or when the requirements for effluent are very high, ordinary biochemical treatment processes are used. Unable to meet removal requirements. [0003] In order to meet the treatment requirements, the currently used processes include Biological Aerated Filter (BAF) process, Membrane Bioreactor (MBR) process, and Membrane Pow-dered activated carbon (M-PAC) proce...

AI Technical Summary

Problems solved by technology

However, these techniques have limitations

Among them, the BAF process and the MBR process cannot meet the treatment requirements when dealing with refractory wastewater or wastewater with particularly high effluent quality.

When using the M-PAC process, since there is a large amount of activated carbon in the system, the secondary sedimentation tank carries a large amount of activated carbon when the water is discharged. In order to reduce the loss of activated carbon, it is necessary to add a large amount of polyacrylamide (Polyacrylamide, PAM) to the secondary sedimentation tank. Part of the activated carbon is lost, which causes an increase in operating costs

In addition, when reverse osmosis treatment is required in the effluent, adding too much PAM will cause reverse osmosis fouling, and at the same time, the effluent will still carry more suspended solids, so M-PAC is not suitable for this process

When using advanced oxidation processes, such as ozone oxidation, hydrogen peroxide oxidation and other physical and chemical methods, the process flow is complicated, the operating cost is high, and the operation is unstable

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