以薄膜蒸餾回收染料製造程序廢水之探討

A study on recovery of wastewater from dyestuff manufacturing process by membrance distillation

林礽龍(LIN,JENG LUNG)

指導教授 ： 游勝傑

中原大學/工學院/環境工程學系/碩士(2018年)

https://doi.org/10.6840/cycu201800170

摘要

為了珍惜水資源並進行有效之利用，產業之用水已積極朝向製程循環使用並以提高水之回收率為努力之目標，在各種水回收技術中薄膜蒸餾技術因具有良好的回收水品質、只需要較低階之能源以及對鹽類之阻擋率高等特點成為重要的水回收技術之一，因此本研究希望應用薄膜蒸餾中之AGMD技術以探討染料製程廢水之回收可行性。
本研究共分為三部分，首先是通量模型之基礎研究用以確認通量模型與操作參數之關係，本實驗利用實驗計劃法探討熱端進料液溫度、熱端流率、冷端流率以及熱端進料液含鹽比例對膜通量之影響，結果顯示通量預估模型之R2為0.996，其調整後之R2 adj 也高達到0.995，表示預測通量模型解釋實際通量之能力相當好，其中影響實際膜通量之最主要因素為熱端之進料溫度且為指數之正效應，表示進料溫度愈高時實際之膜通量愈大，其次含鹽百分率濃度且為負效應，再來是熱端進流量的影響且為正效應，而冷端冷卻水流率影響度最低。第二部分用在於探討理論通量與實際通量之差異，結果顯示在不同之操作條件下實際膜通量為理論通量之34.4%~73.8%，當熱端進料液含鹽量愈低且熱端進流率愈高及冷端流率與熱端溫度愈高時較能接近理論通量。最後為測試染料製程廢水之水回收測試，結果顯示氯離子濃度超過20萬mg/L時，冷凝水之氯離子濃度只有6mg/L，對真色色度超過16萬之鹽析水樣其冷凝液之色度為16，顯示對阻擋率也很高，在COD阻擋率方面由於染料製造程序之合成階段及廢水進入生物處理單元之前，廢水中可能尚存在部分如醋酸及介面活性劑等物質會而造成薄膜蒸餾之初期COD阻擋率偏低影響冷凝水水質而製程清洗廢水以及生物處理單元之後之廢水利用MD處理即能得到高品質之冷凝水。

關鍵字

薄膜蒸餾

並列摘要

In order to cherish water resources and improve efficiency, the industry has been actively working towards the goal of improving water recovery rate. In various water recovery technologies, the membrane distillation technology produces good quality of water by high rejection rate and only requires relatively lower energy consumption, This becomes an important technology for water recovery. Therefore, this research applies the AGMD technology to explore the feasibility of the recovery of wastewater from dyestuff manufacturing process.
There are three parts on this research. The first is the basic research of the flux model to confirm the relationship between the flux rate and the operating parameters. This experiment uses DOE method to discuss the influences with hot-end feed temperature, hot-end flow rate, cold-end flow rate and hot-end feed salinity. The results show that the model prediction flux rate with the R2 0.996 and the R2 adj 0.995. The most important factor affecting the actual flux is the feed temperature at the hot end with a positive effect. The second is salinity with a negative effect, and the third is hot-end flow rate with a positive effect. The cold-end cooling water flow rate is the minor factor.
The second part shows the difference between the theoretical flux and the actual flux. The results show that the actual flux is 34.4%~73.8% of the theoretical flux in various operating conditions. The lower salinity, higher flow rate and higher temperature of hot-end feed will be closer to the theoretical flux.
Finally, our test of the dye process wastewater, show that even the concentration of chloride ion exceeds 200,000 mg/L and ADMI is more than 160,000 in hot-end feed, the concentration of chloride ions in the condensed water is only 6 mg/L and ADMI is 16. In COD rejection rate, the wastewater from synthesis stage and before the treatment with the biological unit will have a lower COD rejection rate. It’s because there might still have acetic acid and surfactant in the water. The wastewater from cleaning process and after the biological treatment unit could achieve a high quality of water by MD treatment.

並列關鍵字

membrance distillation

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