目前市場上彩色濾光片仍然以鉻金屬或鉻氧化物作為黑框(Black Matrix)的材料，而壓克力樹脂為彩色濾光片中，應用最廣泛的樹脂，當製程不良時，使用氫氧化鉀作為主要處理藥劑可直接在玻璃基板上蝕除樹脂，以避免將黑框一併蝕去，而基板仍可再生使用。 彩色濾光片玻璃基板再生製程所產生的廢鹼氫氧基濃度高達約1.7 M，導電度值亦多達45mS cm-1，本研究希望藉由電解-電透析法，去除氫氧基濃度，並同時回收與合成氫氧化鉀。 本實驗裝置先為三隔室型，為Pt-Ti / (1)KOH(aq) / A / (2) wastewater / C / (3)KOH(aq) / steel，A、C分別為離子交換膜Asahi AHT與Asahi CMV，KOH(aq)在陽極室、陰極室循環，廢水在淡化室循環。 藉由實驗數據得知，本系統影響εc、εv之主要因素為濃度、流速、及電流密度。綜合以上分析，選取適當實驗條件，操作90分鐘，原廢液淡化效率可達95%。 同時由無因次分析，可得電流效率和電壓效率與系統操作變因有著無因次之關係： 當膜組數增加，使用相同電量時，廢液所需處理時間愈少，其整體電能消耗也降低。而膜組數(1、2、3)對整體電流效率依序為80 %、150 %、221 %。 Now, CF slide manufacturers yet regard chromium metal or the chromium oxide as the dark frame (Black Matrix) material. Acrylic resin is a general coating for CF. Potassium hydroxide, has the advantage that can prevent Black Matrix frame from clearing out substrate, is the cleaning drug for removing acrylic resin. The glass substrate is to be regenerated. The wastewater from the process could contain KOH up to 1.7 M and the conductivity up to 45 mS cm-1. The research of electrolysis - electrodialysis is that the resulting wastewater can be further treated by catalytic wet oxidation. By the derived current density equation and applied voltage equation, the factors affecting both the current and voltage efficiencies found as：current density , concentration and flow velocities of the electrolytic solution. The three compartments system is Pt-Ti / (1)KCl(aq) /C / (2) KOH(aq) /A / (3) wastewater / C / (4) KOH(aq) /Steel. The A and C are Asahi AHT anion membrane and Asahi CMV cation membrane, respectively. By choose the proper experiment condition, operate for 90 minutes, the original wastewater diluate 80% of current efficiency, 80% of recover efficiency of potassium hydroxide. Using the method of multiple regression to find dimensionless groups of the operation variables, we can get the equations for current and voltage efficienies. Under the condition：I = 7.11 A dm-2 , u = 4.83 cm s-1 , d = 0.4 cm, the integral εc = 80 %. From the above results, a suitable set of operating conditions for two and three pairs ion exchange membranes are also studies, respectively. The results show that the capability of recovering KOH is almost proportional to the number of the pairs of the C and A.
