High recovery rate and pollution resistance reverse osmosis membrane water treatment method

Abstract

The present invention relates to a high recovery rate and pollution resistance reverse osmosis membrane water treatment method, which comprises that: 1) hardness of a sewage water body requiring treatment is removed, wherein the water body hardness (calculated as calcium carbonate) is less than 200 ppm; 2) clarifying and filtering are performed, wherein the turbidity of the sewage requiring treatment is less than 1, and SDI is less than 2; 3) the pH value of the influent is continuously adjusted according to a certain rule, and then the influent enters a reverse osmosis operation unit; and 4) reverse osmosis continuous operates to obtain the relatively clean desalted product water and the concentrated solution. The high recovery rate and pollution resistance reverse osmosis membrane water treatment method has the following advantages that: with the periodic change of the pH value, bacterial and other microorganisms in the water body almost impossibly survive so as to substantially reduce pollution caused by bacterial and secretions thereof; the pollution on the reverse osmosis membrane is avoided so as to substantially increase the recovery rate, wherein the recovery rate of the two-stage reverse osmosis co-treatment for the reclaimed water reuse can achieve more than 95%; and the weak link of the reverse osmosis membrane water treatment technology is overcome, such that the reverse osmosis membrane can continuously operate in an efficient and low-cost manner.

Description

technical field [0001] The invention relates to a method for treating polluted water with a reverse osmosis membrane (RO), in particular to a water treatment method with a high recovery rate and pollution-resistant reverse osmosis membrane. The water treatment method can effectively prevent the reverse osmosis membrane from being polluted when treating certain polluted water bodies, and can operate continuously with high efficiency and low cost, and can obtain clean water to the maximum extent. Background technique [0002] In the existing technology, reverse osmosis membrane water treatment technology can remove bacteria, viruses, colloids, organic matter and more than 98% of soluble salts, compounds with a molecular weight greater than 100, colloids and other substances in water to obtain relatively pure water. After nearly 40 years of development, reverse osmosis has become the most important technical equipment for water desalination and pure water production. In the pas...

AI Technical Summary

Problems solved by technology

These requirements make the pretreatment very complicated, and the technology requires that the pH should be operated above 10, which also greatly reduces the operating life of the reverse osmosis membrane

Another shortcoming of this technology is long-term operation at high pH. Some organic substances that may be precipitated at high pH will continue to concentrate and contaminate reverse osmosis. These substances include most organic tertiary ammonia and ketone organic substances.