Advanced Treatment of Organic Wastewater from TFT-LCD Industry by Combination of EMMC Technology and Activated Sludge Process

• Main Authors: Yi-Ming Ma, 馬ㄧ鳴
• Other Authors: Dey-Chyi Sheu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/25982211907195678068

碩士 === 大同大學 === 生物工程學系(所) === 98 === The organic wastewater from TFT-LCD industry contained dimethyl sulfoxide (DMSO) and high concentration of nitrogen compounds. After treated by the activated sludge process, the effluent contained high concentration of NH3-N. Furthermore, during the treatment it stank due to the formation of dimethyl sulfide from DMSO. This work was engaged in an advanced treatment of this wastewater in a SBR by a combination of entrapped-mixed-microbial-cell (EMMC) technology and activated sludge (AS) process. The experiment fell into two parts. Part I, 30 liters of wastewater was treated daily with 48 hrs of HRT. The COD and nitrogen removal efficiency achieved 88.3% and 84%, respectively, which is better than that by AS process alone, being 85.2% and 73.4%, respectively. In addition, the effluent contained 0.56 ppm NOx−N in the combination process of EMMC and AS, which is better than 2.96 ppm NOx−N by AS process. Part II, 100 liters wastewater was treated daily with 24 hrs of HRT with 75 mL/d of methanol being fed to the wastewater. When compared with the AS process alone, the removal of N was improved, NH3-N in the effluent decreasing from 20 ppm to 10 ppm. By adding methanol, the formation of biomass was enhanced, and the phosphoric acid and DMSO were removed completely. Furthermore, the COD and nitrogen removal efficiencies of over 90% and 80%, respectively, were achieved.