比較化學混凝、電化學混凝及Fenton法處理乳膠造紙廢水之研究

Comparison for Chemical，Electro-coagulation and Fenton process for treating wastewater from Latex Coating process

王哲煒(Che-Wei WANG)

指導教授 ： 陳俊成

淡江大學/工學院/水資源及環境工程學系碩士班/碩士(2009年)

https://doi.org/10.6846/TKU.2009.00987

摘要

造紙工業塗層產生乳膠(Latex)廢水處理，以傳統添加化學混凝劑，利用快混慢混的方式進行沉澱或浮除，一般所使用的化學混凝處理後之膠羽量大且容易阻塞系統，而電化學混凝、高級處理Fenton 法於近幾年逐漸廣泛使用於處理廢水，故本研究比較三種不同的處理方式，電化學混凝程序以陽極為鐵板或鋁板，陰極為外層塗有氧化釕( RuO2 ) 的鈦板，電壓及電流、初始pH的改變、氯化鈉電解質添加量、處理時間為參數，處理含有乳膠的塗佈廢水處理後水中汙染含量濃度。
乳膠廢水濁度汙染相當嚴重，先以稀釋十倍廢水做研究，比較三種程序於不同初始pH的濁度去除效率，發現使用過氧化氫為氧化劑的高級處理Fenton 法(500mg/1500mg)對於廢水處理能力較差，氯化鐵及硫酸鋁化學混凝劑濃度為500mg/L時，濁度去除效率佳之pH範圍較大，當氯化鐵及硫酸鋁混凝劑濃度分別為50、100mg/L時，濁度去除於初始pH分別在6和7相當不錯。電化學混凝處理過程中發現，電壓及電解質濃度增佳會使廢水濁度去除率增加，最後處理原液乳膠廢水，化學混凝操作氯化鐵於廢水初始pH及濃度為6和500mg/L，硫酸鋁於廢水初始pH及濃度為7和1000mg/L，可使處理後廢水汙染的濁度、色度、化學需氧量去除率達99%，電化學混凝控制階中性及電壓18V，電解質添加500mg/L，處理時間為16分鐘，可使處理後廢水汙染的濁度、色度、化學需氧量的去除率達99%，當中發現陽極使用鐵會發生極化反應而使處理效率降低，使用鋁板的去除率較穩定。

關鍵字

電化學混凝 ； 乳膠

並列摘要

The treatment of Latex coating wastewater usually faces large quantity of sludge and easily blockage of the system. This study compared Electrochemical, chemical coagulation, and Fenton method in the wastewater treatment, and try to find an appropriate process for the Latex wastewater treatment. The Parameters considered in the electrochemical coagulation procedures include voltage, current, pH, addition sodium chloride concentration and reaction time. The chemical coagulation used ferric chloride and aluminum sulfate as coagulant.
The turbidity removal efficiency for three procedures with the wastewater different initial pH was compared. The Fenton method that uses the hydrogen peroxide as oxidant for the treatment of wastewater and its removal efficiency is relatively less. For chemical coagulation its removal efficiency is good for a wide range of pH of the wastewater. Electrochemical coagulation process was found that increase turbidity removal efficiency by increase voltage and electrolyte concentration. With the operation parameters of chemical coagulation are initial pH=7 and ferric chloride concentration = 500mg / L, and aluminum sulfate concentration=1000mg/L and the initial pH =7. The removal efficiency for turbidity, color, chemical oxygen can reach 99%. Electrochemical coagulation control voltage 18V in neutral, electrolyte add 500mg / L, the reaction time is16 minutes, can provide removal efficiency up to 99% , When the aluminum and iron were used as anion, the iron anode occur depolarization while the aluminum anode is more stable than iron.

並列關鍵字

Electrochemical coagulation ； Latex

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