生物處理程序放流水影響薄膜積垢潛勢之研究

Effects of the effluent from biological wastewater treatment processes on membrane fouling

胡文勝(Wen-Sheng Hu)

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(2011年)

摘要

本研究主要是利用經由連續批式活性污泥法(Sequencing batch reactor, SBR)系統馴養穩定之污泥，利用污泥密度指數(Silt density index, SDI)檢測設備及UF(Ultrafiltration)薄膜模型廠進行積垢潛勢之研究，探討生物處理程序放流水之積垢潛勢。
本研究SBR馴養穩定之條件為SRT 15天，操作之兩種處理程序分別為傳統活性污泥法及厭氧-好氧(A/O)活性污泥法，以比較不同出流水對薄膜積垢影響之潛勢。在SDI試驗中可發現，低濁度水樣並無法代表低SDI值，經UF薄膜程序後之出流水濁度與先前經SDI預處理之出流水濁度相比較，可發現其濁度可進一步被降低，但其情形並不顯著，操作之流量、DOC濃度及壓力皆為一相互關係，即為在流量明顯降低的同時，壓力會隨之提高，而DOC濃度也會明顯減少，在經UF薄膜程序後之出流水進行SDI可發現，其SDI值皆有顯著下降，而出流水之DOC含量也有其去除效果。
研究結果顯示，在120小時之UF薄膜過濾實驗中，UF薄膜之流量、壓力及DOC濃度呈現密切之關係，在流量尚未降低前，壓力與DOC濃度無明顯變化。經過一段時間之操作後，可發現當流量降低時，壓力明顯提高3至7psi，同時DOC濃度有明顯下降，濃度降低約±2mg/L。由此結果研判放流水中之溶解性有機碳在通過UF薄膜後，即會造成薄膜阻塞，而此趨勢隨著稀釋倍數不同，阻塞時間也隨之不同。

關鍵字

連續批式活性污泥法 ； 污泥密度指數 ； 薄膜積垢 ； 溶解性有機碳

並列摘要

In this research, the activated sludge was acclimated in a sequencing batch reactor (SBR).The sludge density index (Silt density index) and UF (Ultrafiltrtion) membrane were used to study the fouling potential of biological processes effluent (biological wastewater treatment processes) and the potential impact of fouling factors.
The SBR was operated under the condition SRT 15 days. The effluent of activated sludge (AS) and anaerobic - aerobic (A / O) process were used to explore the different impact on the membrane fouling. Experimented result showed that low-turbidity water samples are not representated of the low SDI value.
The SDI and turbidity can be found further reduced affen UF membrane filtration.
The flow rate, DOC concentration and pressure are all a relationship, that is, the flow was significantly reduced at the same time, pressure will increase as the DOC content will be significantly reduced.
The results show for the experiments to 120 hours, the UF membrane of the pressure and flow both had the close relationship between the DOC content. Before the flow had not yet decreased, the pressure and the DOC content were not significant be changed, after a period of time that flow was decreased, the pressure was significantly increased 3 to 7psi, and accompanied by the DOC content was decreased significantly about ± 2mg / L . Judged by the results of the dissolved organic carbon , while the effluent crossed to the UF membrane, that will cause the membrane obstruction. And this trend with the different dilution, the block time will be change. And by the UF membrane module of the water effluent, the SDI value and turbidity of the phenomenon were both decrease.

並列關鍵字

membrane fouling ； dissolved organic carbon (DOC) ； silt density index (SDI) ； sequencing batch reactor (SBR)

參考文獻

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