Abstract:
This research is to study removal of COD in textile manufacturing wastewater by coal fly ash zeolite. Zeolite syntheses using coal fly ash activated by Sodium Hydroxide and Spent alkaline solution from black oxide coating industry were studied. It found that the optimum condition for synthesis both coal fly ash zeolite activated by Sodium Hydroxide solution and coal fly ash zeolite activated by Spent alkaline solution were similar, they are concentration of 3 molars, reaction temperature of 80ํC and reaction time of 4 days. The result revealed that the optimum condition exhibiting the highest CEC of synthesized zeolite were 517.49 and 473.74 cmol/kg. respectively. It found that the most suitable for removal of COD and color in textile manufacturing wastewater by zeolite synthesized from coal fly ash activation by Spent alkaline solution were quantity of 20 grams at pH 7 and contact time of 120 hours. From testing in term of the organic that involved COD adsorption can explain by Freundlich isotherm that the equation is x/m = 5.27x10[superscript -23] C[subscript e][superscript 10.705], it was that the organic that involved COD adsorption capacities of synthesized zeolite was 24.71 mg./g of zeolite. For the study of spent zeolite regeneration reused for removal of COD and color in textile manufacturing wastewater, it found that spent zeolite 5 grams put in Sodium Chloride solution 5% and contact time 1 and 3 hours that gave maximum COD removal was 7.94%. The capacities of regenerated zeolite for removal COD was low and increased color intensity of wastewater for every regeneration conditions. The removal capacities of COD and color in textile manufacturing wastewater by mold synthesized zeolite were evaluated with continual testing and collected wastewater at depth of synthesized zeolite 30 60 90 and 120 cm. It found that its removal capacities of COD was 26.35, 24.19, 24.13 and 23.59 BV.respectively, while its removal capacities of color was 30.36, 28.19, 26.80 and 26.59 BV.respectively at breakthrough point.