- 學位論文
廢液處理廠RO系統薄膜阻塞及清洗特性之研究
The characteristics of membrane fouling and cleaning for RO system on waste liquid treatment plant
摘要
本研究主要針對廢液處理廠，於廢液處理時使用RO（Reverse Osmosis）系統，其所形成的阻塞薄膜為研究對象，首先分別就水質與阻塞因素進行探討，以評估適當之清洗液改善薄膜阻塞，並藉由流通量（Flux）分析其薄膜回復情形。 研究結果顯示，由於進流水濃度偏高且變化性大，促使薄膜表面滲透壓大，以增加操作壓力以致於部份薄膜有破損的現象，故可發現RO系統漸漸對於SS與溶解性鹽類無法有效的去除，並分析水質指標SDI（Silt Density Index）與LSI（Langelier Saturation Index），結果顯示其水質SDI>5、LSI>0代表容易形成薄膜阻塞。並藉由XRF（X-ray Fluorescence）與SEM/EDS（Scanning Electron Microscopy/Energy Dispersive Spectrometer）分析已阻塞薄膜，發現RO系統於前端膜管阻塞成份以C、Ca、P元素為主而後端膜管則以Na、Cl、S元素為主。 阻塞薄膜於清洗時，以氨基磺酸、檸檬酸、磷酸以及水當作清洗劑，經由XRF、SEM/EDS分析Ca、P、S及Cl，發現以檸檬酸及水浸泡5min後有很好的去除效果，並配製不同濃度之檸檬酸以及不同溫度之清洗水，藉由IC及ICP分析其去除率，發現以0.2%檸檬酸能去除阻塞薄膜中溶解度較低的PO43-及Ca2+離子其去除率為最高，清洗後薄膜經由SEM/EDS分析下能明顯看到孔隙纖維，且的流通量（Flux）則能回復到原始薄膜流通量，而水溫於25℃能洗掉阻塞薄膜當中的Cl、S、Na。故阻塞薄膜清洗時先使用25℃水清洗溶解性鹽類，隨後在使用0.2％檸檬酸清洗難溶解性鹽類。
並列摘要
This study for waste liquid treatment plant, waste liquid treatment for RO (Reverse Osmosis) system, it fouling the formation of membrane for the study, the first of all obstructions on the water quality and to fouling factors to assess the appropriate cleaning solution to improve the fouling membrane, and by Flux to analyze the membrane Restore the situation. The main showed that, due to high concentrations feed water and diversity, is to promote film surface large osmotic pressure to increase the operation pressure so that was part of the membrane has broken the phenomenon, it can be found for the SS and the RO system gradually dissolved salts can not be effectively removed and ldentification water index the SDI (Silt Density Index), as well as LSI (Langelier Saturation Index)> 0, show that the water quality easily blocked the formation of thin films. And by XRF (X-ray Fluorescence) and SEM / EDS (Scanning Electron Microscopy / Energy Dispersive Spectrometer) analysis of membrane has been fouling and found that RO membrane system was fouling the front-end components in C, Ca, P elements in the main and back-end membrane while Na, Cl, S-based elements. The fouling membrane cleaning to sulfamic acid, citric acid, phosphoric acid and water as a cleaning agent, by XRF, SEM / EDS analysis of Ca, P, S and Cl, was found soaked in citric acid and water well after 5min removal efficiency. After the preparation of different concentrations of citric acid as well as the cleansing water of different temperatures, and by IC and ICP analysis of its removal. 0.2% citric acid was found to be fouling away the membrane PO43-and Ca2+ ions as the highest removal efficiency. By SEM / EDS analysis of the porous fiber can clearly see, and after cleaning the flux (Flux) can return to the circulation of the original film. Cleaning temperature 25℃in blocking film which can cleaning the Cl, S, Na removal efficiency achieved. Obstructive film when it first used to clean water 25℃soluble salts, followed by 0.2% in the use of citric acid cleaning solution of salt concentration difficult.
參考文獻
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