Novel drinking water advanced treatment and purification device and method

Abstract

The invention discloses a novel drinking water advanced treatment and purification device and a method. The device comprises a flushing system, a negatively charged ultrafiltration membrane assembly (1), a dosing system and a water production system, wherein the negatively charged ultrafiltration membrane assembly (1) comprises a water inlet (11), a produced water port (12) and a concentrated water port (13), the water inlet (11) is connected to a water inlet tank, the concentrated water port (13) is connected to the flushing system and the dosing system, and the produced water port (12) is connected to the water production system. The device and method provided by the invention utilizes negatively charged groups of a charged ultrafiltration membrane for advanced treatment of harmful anions and part of small molecular organic matters in inflow water, and makes use of positive diffusion chemical cleaning for efficient restoration of the membrane running flux, thus reaching the purpose of advanced treatment of micro-organic polluted drinking water.

Description

technical field [0001] The invention relates to the technical field of advanced treatment of drinking water, in particular to a novel device and method for advanced treatment and purification of drinking water. Background technique [0002] At present, ultrafiltration (UF) membranes are widely used in the drinking water advanced treatment and purification systems of waterworks. Ultrafiltration (UF) membranes have many advantages in the advanced treatment of waterworks, such as high effluent quality, stable water quality, small equipment footprint, and comprehensive Automatic operation, no need to add chemical reagents and other advantages. However, the economics of UF membrane system application in waterworks will be affected by many factors: power system requirements, electricity costs, labor costs, material costs, membrane cleaning costs, scale inhibitor costs, membrane life cycle and membrane replacement costs, etc. At present, the main obstacle to the application of UF ...

AI Technical Summary

Problems solved by technology

The traditional UF membrane has the following disadvantages: 1) Conventional UF cannot separate components whose particle size is similar to its pore size; 2) The large flux and high rejection rate of UF membrane are inherently contradictory

For example, in order to obtain a higher UF membrane permeability coefficient or a faster separation speed, the pore size of the membrane is generally increased, but the large pore size reduces the solute retention rate of the membrane and affects the selective separation characteristics of the membrane.

The pore size of the UF membrane decreases as the particle size of the components to be separated decreases, but this will inevitably lead to problems such as decreased flux, increased equipment operation and operating costs

Therefore, when the traditional UF membrane is applied in practice, it is necessary to comprehensively balance the membrane flux and the solute rejection rate, which ultimately limits the separation speed and yield of the product; 3) The traditional UF membrane has weak anti-pollution ability, and various organic substances are easy to deposit on the membrane surface. Causes a decrease in membrane flux, rapid flux decay, increased system operation and operating costs, and reduced UF system life

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