Efficient and antibacterial chemical sewage treatment method

Abstract

An efficient and antibacterial chemical sewage treatment method is characterized by including the following procedures that firstly, sewage is recycled and reclaimed water is prepared, wherein sewage of chemical sewer is obtained and subjected to flocculation and precipitation, and the requirement for reclaimed water that the concentration of suspended solids in outflow water is smaller than 100 mg / l is met; secondly, primary sterilization is conducted, wherein the reclaimed water is filtered by means of a 1-mm grating filter, an oxidizing antibacterial agent, namely sodium hypochlorite, is added for sterilization, and the dosage is 2-3 mg / l; thirdly, ultrafiltration treatment and secondary sterilization are conducted, wherein the reclaimed water in the second step is subjected to ultrafiltration treatment, SDI is smaller than 3, a non-oxidizing antibacterial agent, namely isothiazolinone, is added in an impact mode in an ultrafiltration water generating mother tube for secondary sterilization, dosage is conducted every 5-8 days and each dosage lasts for 60 min, and the dosage is 30-50 mg / l; fourthly, reverse osmosis desalination treatment is conducted, wherein water subjected to ultrafiltration and secondary sterilization enters a reverse osmosis device for desalination treatment.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for improving the bactericidal effect during the treatment and recycling of industrial sewage in the chemical industry, and belongs to the technical field of wastewater treatment. Background technique [0002] Water is an important and precious resource. With the acceleration of industrialization, the contradiction between supply and demand of water resources has become increasingly prominent. The chemical industry is a large water user. In the production process, on the one hand, there is a large amount of industrial sewage discharge, which pollutes the environment. On the other hand, it needs to consume a large amount of desalted water. Therefore, environmental pollution and water consumption are very prominent. In order to alleviate the contradiction between the supply and demand of water resources, in recent years, the double-membrane method (ultrafiltration + reverse osmo...

AI Technical Summary

Problems solved by technology

According to the current process, the oxidative bactericide (sodium hypochlorite) is continuously added for sterilization during the operation of ultrafiltration. During the operation of this process, the following problems are found: due to the complex composition of chemical sewage water, various indicators fluctuate greatly, the types of bacteria and The quantity is large, and the sterilization method of sodium hypochlorite alone cannot meet the sterilization requirements of reverse osmosis, resulting in serious pollution of reverse osmosis to reclaimed water during operation, shortening the chemical cleaning cycle, the shortest is less than one month, seriously affecting the normal operation of reverse osmosis