Abstract:
The study aimed to treat systhetic wastewater containing direct red 23 and direct blue 201 and textile
wastewater by GAC-SBR system under various MLSS of 1,000-3,000 mg/l at HRT of 7.5 days. The
effect of dyes concentration of the wastewater on the efficiency of GAC-SBR system was also
investigated.
The results showed that both direct dyes could be removal by bio-sludge under GAC-SBR system with
the high efficiency. The GAC-SBR system showed the highest removal efficiency when MLSS was
increased up to 3,000 mg/i. The COD BODs TKN and direct red 23 removal efficiency of GAC-SBR
system were highest of 92.77±4.53, 97.60±1.44, 96.82±1.48 and 99.93±0.03 % , respectively with
systhetic wastewater containing 40 mg/l direct red 23. The COD BODs TKN and direct blue 201
removal efficiency of GAC-SBR system were highest of 96.80±2.3, 98.15±1.22, 93.60 ±2.2 and
94.03±2.76% respectively with systhetic wastewater containing 40 mg/l direct blue 201. The
concentration of direct dye was also effected to the efficiency of GAC-SBR system. The removal
efficiency of GAC-SBR system was decreased when the direct red 23 was increased up to 120 mg/l.
However the dye concentration not effective to COD BODs and TKN removal efficiency of
GAC-SBR.
Glucose or the organic matters (wastewater from Thai rice noodle factory) could also increase the
removal efficiency of GAC-SBR system. Wastewater from textile factory that adding glucose to
increase BODs concentration up to 1,500 mg/l was efficiencies better than wastewater from Thai rice
noodle factory (BODs concentration up to 1,500 mg/I). The COD BODs TKN and dye removal
efficiencies of wastewater adding glucose were 88.81±2.37, 84.78±1.90 and 87.48±5.20, 82.30±5.67 %,
respectively.