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| New Integrated Processes for Treating Cold-Rolling Mill Emulsion Wastewater |
ZHANG Yun-hua,et al |
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Abstract A large amount of oily wastewater is discharged during steel rolling in the steel industry, and the emulsion wastewater discharged during the steel cold-rolling mill contain a lot of non-degradable organic pollutants. However, the traditional treatments of oily wastewater can hardly work well to reach the discharge standards. There are two new techniques for emulsification wastewater treatment: the one is the integrated process of gas-energy-flocculation (GEF) and electrochemical catalytic oxidation (ECO) and membrane bioreactor (MBR); the other is the integrated process of ultra-filtration (UF) and ECO and MBR. Both of them are adopted to the continuous pilot test on the scale of 200L/h to 3000L/h. Moreover, every module of the combined techniques is analyzed. The operating parameters of every mould are investigated and the relationships between the operating parameters and CODCr removal efficiencies of the two integrated processes are evaluated. The experimental results have shown that almost all the oil and non-degradable organic substances are effectively removed with the effluent CODCr less than 30mg/L. The ultimate treated water quality could meet the requirement for productive reuse. What��s more, the integrated process of UF and ECO and MBR has a more stable effluent quality. Hence it can be widely used in a variety of industrial fields.
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Received: 28 August 2009
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2010, Vol. 17 
