Immersed ultrafiltration membrane chemical cleaning liquid medicine recycling method

Abstract

The invention discloses a method for recycling chemical cleaning liquid medicine of an immersed ultrafiltration membrane. An immersed membrane pool, a chemical cleaning water tank and a neutralizing pool are included. An immersed ultrafiltration membrane assembly is arranged in the immersed membrane tank; a membrane pool emptying opening is formed in the bottom of the immersed membrane pool; one path connected with the membrane pool emptying port is a chemical cleaning medicine feeding and liquid medicine recycling pipeline and is communicated with a chemical cleaning water tank; the other path is communicated with the neutralization tank; the immersed ultrafiltration membrane assembly is communicated with a water supplementing opening in the upper part of the chemical cleaning water tank through a water producing pipe; an agent stock solution inlet is formed in the upper part of the chemical cleaning water tank; the lower part of the chemical cleaning water tank is of a cone bottom structure which is communicated with the neutralizing tank; when the chemical cleaning is finished, judging whether the waste liquid meets the recycling standard or not; the waste liquid meeting the recycling standard is discharged into the chemical cleaning water tank and waits for next cleaning; and the liquid medicine which does not meet the recycling standard is emptied through an emptying pipe. According to the method, the chemical cleaning liquid medicine of the immersed ultrafiltration membrane is recycled, so that the medicine consumption can be obviously reduced, and the operation regulation and control of a membrane system are optimized.

Description

technical field [0001] The invention belongs to the field of advanced treatment of tap water, and in particular relates to a method for reusing chemical cleaning liquid of a submerged ultrafiltration membrane. Background technique [0002] In recent years, with the continuous development of my country's economy and society, the pollution of drinking water sources has become increasingly serious, and the safety of drinking water has become an environmental and health issue that is highly concerned by the international community. The new generation of drinking water treatment process with membrane technology as the core has the advantages of superior retention of particles, colloids and pathogenic microorganisms, as well as the advantages of low consumption of disinfectants, intensive land occupation, and easy automation. The ultrafiltration membrane can effectively remove pathogenic microorganisms in water, such as "two bugs", bacteria and even viruses, by virtue of its nano-...

AI Technical Summary

Problems solved by technology

However, when performing online chemical cleaning, the submerged ultrafiltration membrane tank has a large volume and a large ineffective volume, and the proportion of the chemical agent that effectively contacts the membrane surface and chemically elutes the pollutants is not high in the total chemical dosage, and there is a considerable proportion. The situation that the chemical is discharged into the waste water pool along with the waste liquid; at the same time, in order not to cause secondary pollution to the environment, the amount of neutralizing chemical is also increased accordingly

The excess consumption of these two parts of the medicament has led to an increase in the overall drug consumption. For the submerged ultrafiltration membrane system, where the cost of drug consumption accounts for nearly half of the total operating cost, it will undoubtedly increase the cost.

In addition, the submerged ultrafiltration membrane system with online cleaning has high requirements for the anti-corrosion of the inner wall of the membrane pool and the pipeline. If there are still high concentrations of chemicals in the chemical cleaning waste liquid, the life of the system will be reduced and the system will be subtly affected. damage

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