Method for purifying reverse osmosis concentrated water with active carbon-membrane separation countercurrent absorption

Abstract

The invention discloses a method for purifying reverse osmosis concentrated water with an active carbon-membrane separation accumulation countercurrent absorption technology. The method comprises the following steps of: extracting concentrated drain water produced in the running process of a reverse osmosis device, and adding into a membrane reactor for undergoing an adsorption reaction; dissolving powder active carbon (PAC) into the membrane reactor for continually adsorbing, wherein the adding amount of the PAC is determined according to the content of organic matters in the reverse osmosis concentrated water, and the adding amount of the PAC can be added appropriately if a treatment effect is poor; and performing aerated stirring and circulating reflux, adsorbing for 10-15 minutes, uniformly dispersing the PAC, fully mixing with reverse osmosis concentrated water, and discharging purified water with a hollow fiber membrane assembly. PAC accumulation countercurrent absorption and membrane separation are used together, so that cost is low, operation is easy and convenient, and automatic degree is high. Due to the adoption of the method for purifying reverse osmosis concentrated water, the requirements of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant are met, and the potential hazard of direct discharge on a water environment is reduced; and the method plays an important role in maintaining the balance of a water ecological system.

Description

technical field [0001] The invention belongs to sewage treatment technology, and in particular relates to a treatment method for removing dissolved organic pollutants in concentrated water in a reverse osmosis device, so as to discharge it up to the standard or reuse it for industrial production water. Background technique [0002] At present, with the increase of domestic and industrial water consumption year by year, it is in stark contrast to the current situation of serious water pollution in my country and increasingly stringent standards for sewage treatment and reuse, resulting in increasingly prominent contradictions between supply and demand of water resources. In this context, the recycling of sewage has become an inevitable choice for environmental protection and sustainable utilization of water resources. Double-membrane methods (ultrafiltration / microfiltration + reverse osmosis) are widely used in sewage treatment and recycling. While the reverse osmosis (RO) pr...

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Problems solved by technology

[0004] Although reverse osmosis and nanofiltration technology can remove organic matter in RO concentrated water, the cost is too high and economically unreasonable; the high salinity and refractory organic matter in RO concentrated water seriously affect the activity of microorganisms in activated sludge. Technical processing is severely limited

At present, the degree of effective treatment of RO concentrated water is still very low, so it is imminent to find an economical and reasonable process technology that can efficiently remove target pollutants

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