Cleaning device and cleaning method used in microfiltration process

Abstract

The invention discloses a washing device and a washing method applicable to a microfiltration process. The microfiltration washing device is a different-diameter flow switching cylinder, wherein two ends of the different-diameter flow switching cylinder are connected with a raw material liquid pump and a microfiltration membrane module; a sliding different-diameter piston is arranged in the cylinder. The washing method comprises the washing processes of performing microfiltration through a plurality of parallel microfiltration membrane machines, and injecting filtration liquid into the flow switching cylinder; washing one microfiltration membrane machine and enabling other microfiltration membrane machines to work normally; finishing washing the microfiltration membrane machine, performing microfiltration on all the microfiltration membrane machines and injecting the filtration liquid into the flow switching cylinder repeatedly; repeating the process similarly and carrying out the process of washing all the parallel microfiltration membrane machines. Through the washing device and the washing method applicable to the microfiltration process, the washing device is simplified; the operation process is simple; the microfiltration discharged water is continuous; the energy resource is saved; the production efficiency is improved.

Description

technical field [0001] The invention relates to a cleaning device and a cleaning method used in a microfiltration (MF) process, belonging to the technical field of membrane cleaning. Background technique [0002] Microporous filtration (MF, referred to as microfiltration), reverse osmosis, and ultrafiltration are all pressure-driven membrane separation technologies. The diameter of the separated components is 0.03-15 μm, mainly removing particles, sub-particles and fine particles. Its basic principle is mesh-like filtration. Under the action of static pressure difference, water molecules and particles smaller than membrane pores pass through the filter, while particles larger than membrane pores are trapped on the membrane, so that components of different sizes can be separated. The microfiltration process has been widely valued because of its low energy consumption, stable effluent quality, and automatic control. [0003] The most important problem encountered in the appl...

AI Technical Summary

Problems solved by technology

Currently commonly used microfiltration cleaning devices and methods such as figure 1 As shown, there are mainly the following problems: usually multiple sets of microfiltration devices are installed, and all the microfiltration membranes in each device are simultaneously produced, cleaned, quickly flushed, and chemically cleaned; the flow rate of the microfiltration backwash pump is relatively large, and cleaning The water volume is generally twice that of running time, and a larger capacity backwash water tank needs to be installed. When cleaning the microfiltration device, the microfiltration backwash pump pumps water from the water tank; the microfiltration generally runs for 0.5 to 1 hour to clean once, every The first cleaning lasts about 10 minutes, and the backwash pump starts and stops frequently, every 0.5 to 1 hour, the pump starts and stops once, and only runs for 10 minutes each time, the utilization rate of the pump is not high, and frequent starts and stops can easily damage the pump Discontinuous water production

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