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Highly effective sterilization metallurgy sewage treatment method

A sewage treatment method and high-efficiency technology, which are applied in the fields of metallurgical wastewater treatment, sterilization/microdynamic water/sewage treatment, water/sewage multi-stage treatment, etc. Affect the normal operation of reverse osmosis and other issues, to save the cost of chemical cleaning, prolong the chemical cleaning cycle, and improve the effect of sterilization

Inactive Publication Date: 2009-09-02
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 metallurgical wastewater, various indicators fluctuate greatly, and 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

Method used

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  • Highly effective sterilization metallurgy sewage treatment method
  • Highly effective sterilization metallurgy sewage treatment method
  • Highly effective sterilization metallurgy sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A. Recycle sewage and produce reclaimed water: take sewage from metallurgical industry sewers, and after flocculation and sedimentation, meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l;

[0034] B. One-time sterilization: filter the above-mentioned reclaimed water through a 1mm grid filter, and add oxidizing bactericide sodium hypochlorite for sterilization and disinfection, the main function is to inhibit the growth of bacteria and microorganisms. The dosage is 2mg / l.

[0035] C. Ultrafiltration treatment and secondary sterilization: After the reclaimed water treated in step B is subjected to ultrafiltration treatment, the SDI is less than 3, and a non-oxidative bactericide isothiazolinone is added to the ultrafiltration jellyfish tube for secondary sterilization , to reduce the content of bacteria and microorganisms in the reverse osmosis water and extend the chemical cleaning cycle of reverse osmosis. The water temperatur...

Embodiment 2

[0038] A. Recycle sewage and produce reclaimed water: take sewage from metallurgical industry sewers, and after flocculation and sedimentation, meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l;

[0039] B. One-time sterilization: filter the above-mentioned reclaimed water through a 1mm grid filter, and add oxidizing bactericide sodium hypochlorite for sterilization and disinfection, the main function is to inhibit the growth of bacteria and microorganisms. The dosage is 3mg / l.

[0040] C. Ultrafiltration treatment and secondary sterilization: After the reclaimed water treated in step B is subjected to ultrafiltration treatment, the SDI is less than 3, and a non-oxidative bactericide isothiazolinone is added to the ultrafiltration jellyfish tube for secondary sterilization , to reduce the content of bacteria and microorganisms in the reverse osmosis water and extend the chemical cleaning cycle of reverse osmosis. The water temperatur...

Embodiment 3

[0043] A. Recycle sewage and produce reclaimed water: take sewage from metallurgical industry sewers, and after flocculation and sedimentation, meet the reclaimed water requirement that the effluent suspended matter is less than 100mg / l;

[0044] B. One-time sterilization: filter the above-mentioned reclaimed water through a 1mm grid filter, and add oxidizing bactericide sodium hypochlorite for sterilization and disinfection, the main function is to inhibit the growth of bacteria and microorganisms. The dosage is 2.5mg / l.

[0045] C. Ultrafiltration treatment and secondary sterilization: After the water in step B is treated by ultrafiltration, the SDI is less than 3, and the non-oxidative bactericide isothiazolinone is added to the ultrafiltration water-producing mother pipe for secondary sterilization to Reduce the content of bacteria and microorganisms in reverse osmosis water and prolong the chemical cleaning cycle of reverse osmosis. The water temperature is 31°C, the dosin...

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Abstract

The metallurgical effluent treating process with high bactericidal efficiency belongs to the field of waste water treating technology, and aims at raising the bactericidal efficiency of metallurgical effluent treating process. The process includes the following steps: 1, recovering effluent and preparing intermediate water; 2. the primary sterilizing with oxidant disinfectant; 3. ultrafiltering and secondary sterilizing with non-oxidant disinfectant; and 4. reverse osmosis desalting. The process can ensure the normal running of the reverse osmosis system, prolong its chemical cleaning period, lower metallurgical effluent treating cost and reduce environmental pollution caused by the exhausted waste detergent solution.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for improving the sterilization effect in the process of treatment and recycling of industrial sewage in the metallurgical 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 metallurgical industry is a large water user. During 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, the problems of 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/50C02F1/44C02F103/16
CPCY02A20/131
Inventor 王竹民任志刚董金冀陈小青
Owner HEBEI IRON AND STEEL
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