Membrane bioreactor system for energy saving- The case study of TFT-LCD Plant

• Main Authors: Tsai, Wei-Yi, 蔡為毅
• Other Authors: Tsai, Churn-Jinn
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/c8y48z

碩士 === 國立交通大學 === 工學院永續環境科技學程 === 102 === Due to the global climate change caused by the emission of greenhouse gases in recent years, energy saving and carbons reducing has become important international subjects. The recycle and reuse of water resource is one of important index of energy saving and carbon reducing in industrial companies. Membrane Bio-Reactor(MBR) has the advantages such as better recycling water quality, fewer space demands, lower sludge production, easier renovation and reconstruction in old factories and higher capacity to endure the variation in inflow water concentration, making it have great development space in wastewater treatment and recycle. This research used one of TFT-LCD factory installed with the MBR organic waste water recycling system as the research subject. The result showed with MBR recycling system, the removal rate of TOC in photoelectric wastewater in biological processing procedure can reach up to 95%~98%. With sludge loading limited under 0.05 kg-TOC/kg-SS-day, TOC content of the discharge water through MBR system is lower than 5 mg/L. With the treatment of the Reverse osmosis (RO) unit, the TOC removal rate was more than 95%, and the reduction of conductivity in water was more than 90%. In energy saving and carbon reducing, the dayly water requirement of 2,500 m3/day in the factory can reduce 1,938 m3/day by installing MBR recycling system, making the annul reductin of carbon to 1,645,510 kg-CO2. The unit cost of the ultra pure water system in the factory was also reduced after using the recycled water from MBR recycling system. By analyzing the data, it was showed that the electric consumption in the pretreatment of ultra pure water system reduced 2,558 kwh/day, making the effect of annul carbon reductin reach 487,469 kg-CO2, and the HCLand NaOH consumption in the ultra pure water system reduced 1,008 m3/day and 388 m3/day, making the effect of annul carbon reduction reach 720,406 kg-CO2 and 327,272 kg-CO2, showing great achievements on energy-saving and carbon reducing.