Developments and Application of Novel Water Treatment Techniques in CSC

oleh Wan-Ju Liu, Chu-I Cheng, Mao-Sung Yeh

Penerbit - China Steel Corporation, Taiwan

Kategori - Kejuruteraan & IT

As a trustworthy steel company of global distinction that pursues growth together with environmental protection, China Steel Corporation (CSC) has developed and applied the electrodialysis reversal (EDR) and membrane bioreactor (MBR) techniques to decrease water usage and pollution emissions. An economical EDR desalination technique reclaimed 550 m3 of cooling wastewater per day in hot rolling process with 80% conductivity removal rate, and 78% recovery rate. 540 m3 of rinsed wastewater was reclaimed per day in electrolytic galvanizing line (EGL) and the conductivity of produced demineralized water was <10 µS/cm. On the other hand, high efficient MBR technique was applied to enhance COD removal in wastewater. The MBR system successfully reduced the COD discharge of 720 kg COD/day in coke oven wastewater and 449 kg COD/day in cold rolling wastewater. In addition, a new sludge conditioning method using sol-gel technique was tested on organic sludge produced from Coke Oven WWTP. The water content of the dewatered sludge reduced from 67% to 51% without mixed with inorganic sludge, and the amount of sludge cake sent to the incinerator could reduce 85%. Overall, CSC is very active in innovation, and has strong capability to put the innovations into practice.

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