Treatment process for making sewage as recirculating cooling water

A technology of circulating cooling water and treatment process, which is applied in the field of microbial methods, can solve the problems that oil refining and chemical wastewater cannot be reused economically and rationally, and the operating cost is high, and achieve the effects of saving land occupation area, saving infrastructure funds, and high oxygen utilization rate

Inactive Publication Date: 2006-06-21
HEBEI SUNKIN ENVIRONMENT BIOLOGY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, reverse osmosis and other sewage treatment processes can also meet the effluent quality required for reuse, but the operating cost is too high for enterprises to bear, resulting in a large amount of refining and chemical wastewater being unable to be reused economically and rationally

Method used

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  • Treatment process for making sewage as recirculating cooling water
  • Treatment process for making sewage as recirculating cooling water
  • Treatment process for making sewage as recirculating cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Urban sewage is reused as power cycle cooling water. A certain 30000m 3 / d Sewage reuse project. Influent COD≤150mg / L, BOD≤60mg / L, SS≤60mg / L, NH 4 + -N≤35mg / L; the effluent implements the "Code for Design of Sewage Recycling and Utilization Engineering" (GB50335-2002). The recycled water is used as the supplementary water quality standard of circulating cooling water. square material, it is required to achieve ammonia nitrogen ≤ 1mg / L.

[0040] The biofilter includes immobilized anaerobic biofilter and aerated biofilter, with a total residence time of 4 hours. It is divided into eight groups and five stages in series and parallel operation. The unit pool capacity is 5X5X5.5m. Use carrier 2500m 3 2500Kg of B350 and B500 microorganisms from BL Company of the United States. The residence time of biological activated carbon is 2 hours, and the effluent reaches the required index.

Embodiment 2

[0041] Embodiment 2: For the example of refinery sewage reuse project:

[0042] Sewage treatment project of an oil refinery:

[0043] Water volume: 720m 3 / d

[0044] Biological filter inlet water index: COD: 400-1000mg / L, ammonia nitrogen: 20-200mg / L Outlet water index: The effluent implements the "Sewage Recycling Engineering Design Code" (GB50335-2002) regenerated water is used as circulating cooling water to supplement the water quality standard, and its The water quality standard is: COD≤60mg / L, ammonia nitrogen≤10mg / L.

[0045] The waste water enters the biofilter after oil separation flotation, which is divided into four stages. The first, third and fourth stages are immobilized microbial aerated biological filters, and the second stage is immobilized microbial anaerobic biological filters. The total residence time is 12 hours. , using carrier 160m 3 US BL company B350, B110 microorganisms 160Kg. The biological activated carbon stays for 3 hours, and the effluent a...

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Abstract

The invention relates to a process of employing recovery wastewater as recirculated cooling water, belonging to wastewater treating technique field, which comprises treating the pretreated wastewater with immobilized microbial treatment, making the COD,NH4-N reach the required water quality through the strong degradation by artificial sifted and strengthened specific high effective organism, and through further treatment to reach standard or demand of employing the wastewater as recirculated cooling water. The invention is characterized by the overcoming of the problems in current technology, small sludge production, no secondary settling tank, constructing cost saving by 20-30% and accommodation area saving; stable running, convenient management, short treating and retention time; high oxygen utilization coefficient, running cost saving; simple device structure which is suitable for improvement on the old process or connected with current process: low cost; no influence of the biological active after a time of running stop, which is particularly for operation in repair period or discontinue production.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to microbial methods. Background technique [0002] Petrochemical enterprises are large water users. Every year, a large amount of sewage is discharged into the environment, which not only pollutes the environment, but also causes huge economic waste and waste of resources for enterprises. With the strict environmental protection requirements of the country, these large water users are faced with the return of production wastewater. used puzzle. At present, the sewage treatment plants in the domestic petrochemical industry basically adopt the old three sets of processes of "oil separation + air flotation + A / O" method that were applied in the 1970s, and can only meet the secondary standard of the "Comprehensive Wastewater Discharge Standard" , but the activated sludge process of the old three sets of processes is vulnerable to shocks during the operation process, affecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/28C02F3/10C02F3/30
CPCY02W10/10
Inventor 叶正芳陈丽芳
Owner HEBEI SUNKIN ENVIRONMENT BIOLOGY ENG
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