Treatment and reuse method for reverse osmosis concentrated water

Abstract

The invention discloses a treatment and reuse method of reverse osmosis concentrated water. Chemical treatment of raw water: injecting reverse osmosis concentrated water into a reaction device with a chemical reactor and adding chemicals through a dosing device for chemical treatment and increasing the pH value ; Separation of chemically treated wastewater: inject chemically treated wastewater into the concentrator, and then inject it into the separation host through a booster pump; filter and separate treated wastewater: the wastewater treated by the separation host is boosted by a lift pump, and then passed through a filter and then pumped by high pressure The pump is pressurized and enters the reverse osmosis host; reverse osmosis treatment filtered water: the reverse osmosis host performs reverse osmosis treatment on the softened permeate that has undergone chemical treatment, separation, and filtration, including separation and desalination, and finally produces recycled water Purify water products; the invention removes heavy metal ions, hardness ions such as calcium and magnesium, silicon, COD and other pollutants before entering the concentrated water reverse osmosis, protecting the concentrated water reverse osmosis host; using less chemicals and producing less sludge.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for treating and reusing concentrated reverse osmosis water. Background technique [0002] Existing technologies for desulfurization wastewater treatment have the following deficiencies: [0003] Reverse osmosis technology has been widely used in the field of water desalination treatment with its stable desalination rate of 98%, but its recovery rate is only 70-80%, so that 20-30% of reverse osmosis concentrated water is discharged, causing water pollution. It is a very large waste of resources; and the reverse osmosis concentrated water contains high salt content and a large amount of calcium and magnesium scaling ions, heavy metal ions, silicon ions and other special substances. At this stage, the reverse osmosis concentrated water is basically discharged; Infiltration of concentrated water has become a trend in water treatment applications, ...

AI Technical Summary

Problems solved by technology

In China, the patent number is ZL200920115523.5, the name is "Reverse Osmosis Concentrated Water Reuse Device", and the Chinese Patent Number is ZL200820232440.X, the name is "A Membrane Filtration Device for Treating Reverse Osmosis Concentrated Water", and there are also Chinese patents No. ZL200820168798.0, titled "Reverse Osmosis Concentrated Water Recycling Device" and other existing technologies, in the related research on reverse osmosis concentrated water recycling, their common feature is: directly add scale inhibitor and reverse osmosis concentrated water For other chemical agents, the pH value is controlled to be less than 9, thereby inhibiting the precipitation of heavy metal ions and calcium and magnesium hardness ions on the surface of the concentrated water reverse osmosis membrane behind, so as to achieve the purpose of reusing reverse osmosis concentrated water; the disadvantages of the above-mentioned technical process are: Suppress and disperse heavy metal ions and hardness ions that may cause scaling by antiscalants and other chemicals; primary reverse osmosis concentrated water is high-salt water that has been concentrated 4 times from raw water, all heavy metal ions, calcium and magnesium hardness The concentration of ions, silicon, COD and other pollutants is already very high, which has already exceeded the saturation concentration product of each ion. The antiscalant is added to the first-stage reverse osmosis system to prevent the scale pollution from exceeding the saturation concentration product; now The above-mentioned process technology adds antiscalants to reverse osmosis concentrated water, and there are the following problems: first, excessive addition of antiscalants will cause the generation of other pollutants and cause secondary pollution; second, the ion concentration is too high, However, the antiscalant cannot achieve the purpose of antiscaling; third, it has no effect on COD removal; fourth, the recovery rate of the reverse osmosis system is low