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Cold rolling oily wastewater treatment process

A waste water treatment, waste water technology, applied in the direction of metallurgical waste water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of unstable treatment effect, poor effluent quality, difficult treatment, etc., to achieve Significant economic and environmental benefits, improved wastewater reuse rate, and stable treatment effect

Inactive Publication Date: 2013-11-27
WUHAN IRON & STEEL (GROUP) CORP +1
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  • Description
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AI Technical Summary

Problems solved by technology

Among them, the oily wastewater from cold rolling in the iron and steel production process is very difficult to treat due to its complex composition, high oil content, and high concentration of pollutants.
[0003] At present, traditional physical and chemical methods such as neutralization, coagulation, and precipitation, and biochemical methods such as contact oxidation are used to treat oily wastewater from cold rolling, but there are generally disadvantages such as large dosage, unstable treatment effect, and poor effluent quality.
Among them, a large number of ions are dissolved in the oily wastewater from cold rolling, which cannot be fundamentally removed by the traditional methods mentioned above. It is a difficult problem in the treatment of steel wastewater

Method used

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  • Cold rolling oily wastewater treatment process

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Effect test

Embodiment 1

[0032] Cold rolling thick oil wastewater mainly includes emulsion wastewater and thick oil alkali wastewater. The water quality is as follows: COD is 18000mg / L, oil content is 10000mg / L, SS is 5000mg / L; thin oil wastewater mainly includes thin oil alkali wastewater , the water quality is as follows: COD is 3000mg / L, oil content is 400mg / L, SS is 3000mg / L.

[0033] The above-mentioned dense oily wastewater is pretreated through a grease trap, a paper tape filter, and a ceramic membrane ultrafilter in sequence. Use a grease trap to collect dense oily wastewater, and use the oil skimming device in the grease trap to recover the upper oil slick; paper tape filtration is a security process for ceramic membrane separation, which can remove a part of suspended impurities, foam and sludge, which is very important for the operation of ceramic membranes. To optimize the effect; while the inorganic ceramic membrane uses the principle of sieving and filtration to intercept small particles...

Embodiment 2

[0043] Cold rolling thick oil wastewater mainly includes emulsion wastewater and thick oil alkali wastewater. The water quality is as follows: COD is 50000mg / L, oil content is 3000mg / L, SS is 1000mg / L; thin oil wastewater mainly includes thin oil alkali wastewater , its water quality is as follows: COD is 2000mg / L, oil content is 500mg / L, SS is 500mg / L.

[0044] The above-mentioned dense oily wastewater is pretreated through a grease trap, a paper tape filter, and a ceramic membrane ultrafilter in sequence. Use a grease trap to collect dense oily wastewater, and use the oil skimming device in the grease trap to recover the upper oil slick; paper tape filtration is a security process for ceramic membrane separation, which can remove a part of suspended impurities, foam and sludge, which is very important for the operation of ceramic membranes. To optimize the effect; while the inorganic ceramic membrane uses the principle of sieving and filtration to intercept small particles o...

Embodiment 3

[0055] Cold rolling thick oil wastewater mainly includes emulsion wastewater and thick oil alkali wastewater. The water quality is as follows: COD is 40000mg / L, oil content is 12000mg / L, SS is 8000mg / L; thin oil wastewater mainly includes thin oil alkali wastewater , its water quality is as follows: COD is 1000mg / L, oil content is 100mg / L, SS is 4000mg / L.

[0056]The above-mentioned dense oily wastewater is pretreated through a grease trap, a paper tape filter, and a ceramic membrane ultrafilter in sequence. Use a grease trap to collect dense oily wastewater, and use the oil skimming device in the grease trap to recover the upper oil slick; paper tape filtration is a security process for ceramic membrane separation, which can remove a part of suspended impurities, foam and sludge, which is very important for the operation of ceramic membranes. To optimize the effect; while the inorganic ceramic membrane uses the principle of sieving and filtration to intercept small particles ...

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Abstract

The invention discloses a cold rolling oily wastewater treatment process, which comprises the following steps of: (1), pretreating thick-oil wastewater sequentially by filtering of an oil separation tank and a paper tape and ultra-filtration process of a ceramic membrane, and pre-treating thin-oil wastewater sequentially by adopting the oil separation tank, a CAF (Cavitation Air Flotation) process and a DAF (Dissolved Air Flotation) process; (2), mixing pre-treated thick-oil wastewater with the pre-treated thin-oil wastewater, carrying out biochemical treatment by adopting an electrochemical catalytic oxidation process and an MBR (Membrane Biological Reactor) process in sequence, controlling the water inlet temperature of the MBR process to be 20-35 DEG C, controlling the water inlet pH value to be 7-9, and adding oil-munching high-efficiency micro-organism complex microbial inoculants and MPE (Metallocene Polyethylene) into an MBR membrane tank; and (3), filtering outlet water (treated through the MBR process) by using a reverse osmosis membrane, and carrying out deep desalination treatment so that outlet water reaches emission or industrial production reuse water standard. The invention provides a set of systematic process specially aiming at treatment and reuse of cold rolling oily wastewater in steel mills; the COD (Chemical Oxygen Demand) of treated outlet water is less than 10mg / L; the electrical conductivity of treated outlet water is less than 50mu s / cm; and oil and suspended solids are nearly eliminated completely.

Description

technical field [0001] The invention relates to industrial wastewater treatment technology, in particular to a cold rolling oily wastewater treatment process. Background technique [0002] my country's water resources are short, and iron and steel plants are large industrial water users, and their water consumption is huge. It is an inevitable trend to treat and reuse all kinds of sewage and wastewater in iron and steel production. This is also an urgent need for the development of my country's iron and steel industry. need. Among them, the oily wastewater from cold rolling in the iron and steel production process is very difficult to treat due to its complex composition, high oil content, and high concentration of pollutants. [0003] At present, traditional physical and chemical methods such as neutralization, coagulation, and precipitation, and biochemical methods such as contact oxidation are mostly used to treat oily wastewater from cold rolling, but there are generally...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/16
CPCY02A20/131
Inventor 谢雄王光华杨鉴
Owner WUHAN IRON & STEEL (GROUP) CORP
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