Chen T K, Chen J N
Institute of Environmental Engineering, National Chiao Tung University, NCTU, No 75, Poai Street, Hsinchu 300, Chinese Taiwan.
Water Sci Technol. 2004;50(2):99-106.
In TFT-LCD industry, water plays a variety of roles as a cleaning agent and reaction solvent. As good quality water is increasingly a scarce resource and wastewater treatment costs rises, the once-through use of industrial water is becoming uneconomical and environmentally unacceptable. Instead, recycling of TFT-LCD industrial wastewater is become more attractive from both an economic and environmental perspective. This research is mainly to explore the capacity of TFT-LCD industrial wastewater recycling by the process combined with membrane bioreactor and reverse osmosis processes. Over the whole experimental period, the MBR process achieved a satisfactory organic removal. The COD could be removed with an average of over 97.3%. For TOC and BOD5 items, the average removal efficiencies were 97.8 and 99.4% respectively. The stable effluent quality and satisfactory removal performance were ensured by the efficient interception performance of the UF membrane device incorporated with biological reactor. Moreover, the MBR effluent did not contain any suspended solids and the SDI value was under 3. After treatment of RO, excellent water quality of permeate were under 5 mg/l, 2.5 mg/l and 150 micros/cm for COD, TOC and conductivity respectively. The treated water can be recycled for the cooling tower make-up water or other purposes.
在薄膜晶体管液晶显示器（TFT-LCD）行业中，水作为清洗剂和反应溶剂发挥着多种作用。由于优质水日益成为稀缺资源且废水处理成本上升，工业用水的一次性使用正变得不经济且不符合环境要求。相反，从经济和环境角度来看，TFT-LCD工业废水的循环利用变得更具吸引力。本研究主要探索通过膜生物反应器和反渗透工艺相结合的过程对TFT-LCD工业废水进行循环利用的能力。在整个实验期间，膜生物反应器（MBR）工艺实现了令人满意的有机物去除效果。化学需氧量（COD）的平均去除率超过97.3%。对于总有机碳（TOC）和生化需氧量（BOD5）项目，平均去除效率分别为97.8%和99.4%。与生物反应器相结合的超滤（UF）膜装置的高效截留性能确保了稳定的出水水质和令人满意的去除性能。此外，MBR出水不含任何悬浮固体，且污泥密度指数（SDI）值低于3。经过反渗透（RO）处理后，渗透液的水质优良，COD、TOC和电导率分别低于5毫克/升、2.5毫克/升和150微西门子/厘米。处理后的水可循环用于冷却塔补充水或其他用途。
