A roll-type membrane separation process and equipment for forward feeding and reverse flow cleaning

Abstract

The invention discloses a novel coiled membrane separating technology with forward feeding and reversed washing processes. During the forward feeding process, a feeding valve is opened; a material delivering pump and a high-pressure pump are started; a membrane pile is switched to a normal feeding connection state; a break valve is adjusted, until a system pressure reaches a preset value, such that a membrane separating system operates normally; a liquid material is delivered into a circulation tank, and is delivered into the membrane pile through the material delivering pump and the high-pressure pump; substances penetrating the membrane form a penetration liquid, and substances that do not penetrate the membrane flow back to the circulation tank through the break valve and an condensation pipeline. During the reversed washing process, a water inlet vale is opened; the material delivering pump and the high-pressure pump are started; the membrane pile is switched to a state opposite to the normal feeding state; the break valve is adjusted, until a pressure required by washing is reached, such that the membrane separating system operates in a washing state. The invention also discloses coiled membrane separating equipment with forward feeding and reversed washing functions. With the technology and the equipment, material separating can easily be carried out, the service life of the membrane is prolonged, and the washing effect is improved.

Description

technical field [0001] The invention relates to a roll-type membrane separation process and equipment for forward feeding and reverse flow cleaning, which are mainly used for material separation, prolonging the service life of the membrane and improving the cleaning effect. Background technique [0002] Membrane separation process is a pressure-driven separation technology (see figure 1 ). During the filtration process, the feed liquid is pressurized by the pump, and the feed liquid flows along the surface of the membrane at a certain flow rate, and the material molecules greater than the molecular weight cut-off of the membrane do not pass through the membrane, and flow back to the feed tank as a concentrated liquid (intercept liquid). Substance molecules smaller than the molecular weight cut-off of the membrane pass through the membrane to form dialysate. Therefore, the membrane system has two outlets, one is the reflux (concentrate) outlet, and the other is the dialysat...

AI Technical Summary

Problems solved by technology

The above two phenomena show that the most serious pollution in a membrane outer tube is the last membrane element, that is, the degree of pollution from the feed end to the discharge end is from light to heavy; at present, all spiral membrane systems are designed The direction of the cleaning flow path is consistent with the direction of the feed flow path. It is easier to clean the first membrane element with light pollution during cleaning, while the cleaning effect of the back-end membrane element with more serious pollution is poor and difficult. Restore the performance of the membrane and improve the service life of the membrane, which greatly increases the operating cost of the membrane system and speeds up the replacement frequency of the membrane

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