Pre-coating and air-flotation integrated apparatus

Abstract

The invention discloses a pre-coating and air-flotation integrated apparatus. The apparatus comprises a multiphase flow dissolved air flotation unit and a pre-coating filtration unit, and in combination with a water inlet settling tank, a water production tank, a sludge dirt tank and the like, a set of complete sewage treatment equipment is formed; the air flotation unit is combined by a water inlet pump, a coagulation stirring device, a dosing device and a multiphase flow dissolved air flotation device to realize sewage pretreatment; and the pre-coating filtration unit is combined by a booster pump, a pre-coating filtration device, a membrane powder adding device and a backwash pump and is automatically controlled by a programmable logic controller (PLC). According to the invention, an air floatation device and a pre-coating device are integrated and optimized, and the pre-coating and air-flotation integrated apparatus is provided, so that the sewage treatment equipment with high process applicability, stable operation, controllable operation cost and high operability is realized, and therefore, requirements by the environmental protection situation that quality of inlet water ofsewage treatment is more and more complex while quality requirement of outlet water is higher and higher can be met.

Description

technical field [0001] The invention relates to a device for sewage treatment, in particular to a pre-coating membrane air-flotation integrated device. Background technique [0002] Existing pre-coating membrane devices are applied to sewage treatment, mainly to separate particles of a certain size in sewage by means of membrane filtration, that is, to use the pore size of the membrane tube and the membrane layer to separate particles of different particle sizes. For example, the Chinese invention patent with the notification number CN107344032A discloses "a method for treating oily poly-containing wastewater", which uses pre-coating membrane technology, uses ceramic supports to sinter the membrane as the basic filter, and adds pre-coating material Liquid, forming an effective "renewable layer" on the surface of the basic filter, intercepting the polymer on the surface of the original fouling membrane, and realizing direct filtration of heavily polluted wastewater. [0003]...

AI Technical Summary

Problems solved by technology

[0007] Comprehensively considering the poor applicability, high operating cost and complicated operation of pre-coating membrane filtration technology in sewage treatment, and the problems that the effluent water quality of air flotation technology in sewage treatment cannot meet the discharge standard, the two technologies are integrated. Form a pre-coating membrane air flotation integrated process and optimize it to solve a series of problems in the pre-coating membrane filtration and air flotation technology itself. Specially configure the pre-coating material liquid, the effluent water quality and operation effect are greatly affected by the fluctuation of the influent water quality, and the change of water quality may even directly cause the process equipment to be unusable; the pre-coating membrane filtration technology uses a ceramic membrane skeleton, which often requires water supply. Large pressure to meet the requirements of transmembrane pressure difference during operation, which makes it extremely difficult to reduce operating costs; compared with conventional filtration, pre-coating membrane filtration technology increases pre-coating and backwashing operations, which increases the process itself. It is difficult to control the operation; the air flotation technology itself belongs to the pre-treatment stage. Although it has been continuously optimized, the effluent still cannot meet the treatment requirements.

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