Plate-type ultrafiltration membrane method used for sewage treatment and capable of replacing disinfection process

Abstract

The invention relates to a plate-type ultrafiltration membrane method used for sewage treatment and capable of replacing a disinfection process, belonging to the technical field of filtration processes. The plate-type ultrafiltration membrane method comprises the following steps: step S100, placing a filter formed by enclosing a plate-type ultrafiltration membrane in a sewage pool; S200, filtering sewage with the filter, wherein an inner cavity of the filter communicates with a water outlet pipe, and the water outlet pipe is a purified water outlet end; step S300, aerating the filter at regular intervals so as to eliminate sludge accumulation on membrane surface located on the outer side of the plate-type ultrafiltration membrane; and step S400, subjecting the filter to periodic backwashing so as to realize backwashing of the plate-type ultrafiltration membrane. By adopting the above steps, a subsequent disinfection process is omitted, a large amount of investment, operation and maintenance cost is saved for sewage treatment, and meanwhile, potential safety hazard points possibly existing in process operation are also reduced.

Description

technical field [0001] The invention belongs to the technical field of filtration technology, and in particular relates to a plate-type ultrafiltration membrane method used for sewage treatment and replacing disinfection technology. Background technique [0002] Domestic sewage, livestock and poultry wastewater, hospital wastewater and other wastewater often contain various pathogens, such as viruses, bacteria and parasites. Once the pathogens in these wastewater enter the water body, they will cause a surge of harmful microorganisms in the water body, causing human diseases and even plagues. And they often coexist with Escherichia coli and some other bacteria, so we usually regulate the number of coliforms in the discharged wastewater as a response indicator of pathogen pollution, and strictly control them. [0003] Ultrafiltration membrane equipment is mainly composed of water production pipeline, aeration pipeline and membrane. The basic working principle of the ultrafi...

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Problems solved by technology

[0004] Problems in the prior art: Since the diameter of most bacteria is in the range of 0.5-5 μm, the currently commonly used ultrafiltration membrane equipment has a good interception effect on bacteria and microorganisms through a small membrane pore size, but its production Water does not meet the standard for direct discharge

Among them, although chlorination disinfection, ozone disinfection and ultraviolet disinfection are effective in removing bacteria and viruses, chlorination disinfection will produce residual chlorine, which will still pollute the water body if it is discharged into the water body; the operation of ozone disinfection has certain risks Moreover, the investment is large and the operating cost is high; while ultraviolet disinfection consumes a lot of power and has high requirements for influent water quality

Therefore, the use of disinfection technology not only increases the investment and operating costs, but also increases the difficulty of the process and some possible additional effects

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