Study on the Performance Improvement of Fiber Ball Filter Filtration System
Electronic industrys effluent usually contains micron-scale suspended particles and gel due to both the wafer dicing and backgrinding processes. These fine particles and gel could penetrate the traditional sand filters and cause fouling in the next membrane process, increasing the operating overhead of the membrane reclamation process. In order to solve this problem, a pretreatment of fiber ball filter is suggested to install in the membrane reclamation process. Fiber ball filter has the predominance of high filtering velocity, high contaminants removal capability and high treatedwater quality over the traditional sand filter setups. The experimental results reveal that both the filtering velocity and pressure drop are the key factors, and a combined index composed of the product of this two factors is suggested to be in the range of 32-80 (m/hr)(kgf/cm2) in this study. Under the suggested operating conditions, turbidity removal can reach 70％ and more, i.e. turbidity was reduced from 25 NTU to 5 NTU. Due to the high filtration capacity and plugging rate in the effluent pretreatment process, an additional process of air and water backwash is needed to be executed around every 20 minutes. Complete cleaning is hard to achieve even after repeated rinsing because the fiber balls sustain high quantity of suspended particles and gel. Therefore, an external cleaning process related to partially modifying of the tank piping is suggested: taking the fiber balls out of the tank for external cleaning by hydraulic splashing and hydrocyclone processes, which can do deep cleaning and prevent pulling apart the tying cotton knits. After this extemal cleaning, the refreshed fiber balls can be drawn back to the tank for farther operation with renewed filtering performance.
pretreatment fiber ball filtration turbidity pressure drop backwash
Chun-Jen Huang Kang-Shin Chen Chih-Ming Kao Chen-Chang Chang
Institute of Environmental Engineering, Sun Yat-Sen University, Kaohsiung, Taiwan Capital Engineering Corp., Kaohsiung, Taiwan
国际会议
2010 Asia-Pacific Conference on Desalination and Water Reclamation(2010 亚太脱盐大会)
青岛
英文
135-151
2010-06-22（万方平台首次上网日期，不代表论文的发表时间）