Abstract:
This reseach study about the effect of substrates (carbon and energy sources) on decolorization of monoazo and diazo dyes including high phosphorus concentration that effect on decolorization by Anaerobic/Aerobic SBBR system. The cycle time was 24 hrs in every experiment, fill and draw 1 hr, anaerobic 18 hrs and aerobic 5 hrs. The process of SBBR is the same as that of except that SBR SBBR was filled with media in the raactor. Study used hollow pellet polypropyrene media, 1.5 L per one reactor and fed with synthetic wastewater 5 L per one reactor. Three types of substrates were sugar, milk, sodium acetate (NaAc) and filling ratio to dyes in mg/l COD equal to 30:1 adding dyes powder 100 mg/l. This research had 3 experimental sets to the total 9 experments. The first experimental set studied the effect of substrates on decolorization of monoazo dyes. And sugar, milk, NaAc have the average decolorization efficiency of 85.64%, 89.46% and 89.33% in SU unit and 94.60% 92.74% and 96.39% in ADMI unit. The average COD removal efficiency were 96.33%, 94.40% and 96.55% and the average TKN removal efficiency were 92.08%, 24.03% and 61.36%. Also, the average soluble phosphorus efficiency were 35.94%, 46.65% and 52.56% respectively. The second experimental set used the same substrates as first experiments but change the color to structure diazo dyes. Sugar, milk, NaAc have the average decolorization efficiency of 81.50%, 83.76% and 84.00% in SU unit and 82.74% 89.56% and 89.83% in ADMI unit. The average COD removal efficiency were 94.83%, 94.31% and 82.29% and the average TKN efficiency were 92.00%, 44.39% and 86.45%. In addition, the average soluble phosphorus efficiency were 93.93%, 75.21% and 93.53% respectively. The third experimental set used NaAc and diazo dye but vary the COD/Phosphorus ratio to 150:4, 150:8 and 150:10. The decolorization efficiency had improved more than that of expermental set 2 (NaAc) And the average decolorization efficiency were 84.93%, 86.45% and 90.44% in SU unit and 89.98%, 90.70% and 95.50% in ADMI unit. Teh average soluble phosphorus efficiency were 51.01%, 35.63% and 36.35% respectively. The average removal efficiencies of COD and TKN are the same value as in experimental set 2 (NaAc) which equal to 83.68%, 83.59% and 83.27% and 86.17%, 86.10% and 86.42% respectively. So high phosphorus concentration had no effect on COD and TKN removal. In conclusion, the Anaerobic/Aerobic SBBR system is able to adequately achieve color removal. By using such 3 substrates the decolorization efficiency\ of the same color structure and same color unit were the same values which insignificant in engineering. Furthermore, high phosphorus concentration had improved decolorization efficiency. From experimental set 1,2, the result show that in the joint treatment of dyes wastewater and nutrients, the result of substrates that effect on nutrient is more important than decolorization