膜設備水再生系統與純水系統設計參數與操作成效之比較研究

The Comparative Study on Design and Operation of Membrane Wastewater Reclamation System and Water Purification System

郭家倫(CHIA-LUN KUO)

指導教授 ： 莊順興

朝陽科技大學/理工學院/環境工程與管理系/碩士(2016年)

摘要

在水資源越來越缺乏的年代，積極開發水資源便相對重要，由於都市廢污水具有水質與水量穩定的特性，因此若能將廢污水處理廠放流水再利用，便具有區域性供水水源之開發潛力，可提高水資源的再利用效率，以取代其他水資源的需求。目前薄膜技術在各產業的應用相當廣泛，主要原因為薄膜程序具有高去除效率，使得出流水可達到良好的水質，隨著工業產能的擴大，如何將這些製程廢水回收，也是目前綠色科技與環保的主軸之一。
本研究以六個案例廠分為水回收及純水處理兩大系統，針對設計流程及參數比較，綜合分析兩大系統之設計與操作數據，探討膜設備的處理參數及成效。結果顯示，水再生系統之案例A、B及C廠膜通量範圍為8.5-9.0 L/m2．hr，純水系統之案例D、E及F廠膜通量範圍為9.0-12.0 L/m2．hr。水再生系統案例A廠與純水系統案例D廠之逆滲透(Reverse Osmosis, RO)單元，膜通量分別為8.7 L/m2．hr及11.5 L/m2．hr，其RO總回收率為68.5%及59.5%，產水之導電度分別為205 µS/cm及0.11 µS/cm，平均造水成本分別為30.00元/m3及10.88元/m3，案例A廠之MBR系統成本高，使平均造水成本偏高；以純水系統為例，RO進水前需前處理去除懸浮固體物及大分子，以增加後續RO膜通量及回收效率，節省RO耗材成本。

關鍵字

水再生 ； 純水回收 ； 逆滲透 ； 膜通量

並列摘要

Scarcity of water resources is a serious environmental concern which reflects the importance of the development of new and innovative water resources. Due to the stability in quality and flow of urban wastewater, reuse of effluent from wastewater treatment plants can facilitate the development of regional water supply systems, thus increasing the reuse rate of water sources as well as replacing the exploitation of natural water sources. Membrane technology is used in various fields in recent years, mainly due to the high removal efficiency of membrane processes which discharges effluent of decent quality. In the wake of rapid industrialization, methods to recover process water have become a core of green technology.
This study classifies six case study treatment plants into two groups of systems, namely water regeneration and water purification, and compares as well as comprehensively analyzes both design processes and operational data in order to evaluate the treatment parameters and performance of membrane facilities. Results show that membrane fluxes from water regeneration Plants A, B and C were in range of 8.5-9.0 L/m2·hr while that of water purification Plants D, E, F were in range of 9.0-12.0 L/m2·hr. For Reverse Osmosis (RO) units of Plants A and D, the membrane fluxes were 8.7 L/m2·hr and 11.5 L/m2·hr respectively with a RO recovery rate of 68.5% and 59.5% each. The conductivity of the pemeate from these plants were each 205 µS/cm and 0.11 µS/cm, and the average cost of water production was placed at NT30.00/m3 and NT10.88/m3 respectively. The high cost of the MBR system at Plant A has led to higher cost of water production, which, in terms of water purification, RO influent must undergo pretreatment to remove suspended solids and macromolecules so as to increase the RO permeate flux and recovery rate, therefore reducing RO material costs.

並列關鍵字

Water regeneration ； Pure water recovery ； Reverse osmosis ； Membrane flux

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