Treatability studies with granular activated carbon (GAC) and sequencing batch reactor (SBR) system for textile wastewater containing direct dyes.
The GAC-SBR efficiency was decreased with the increase of dyestuff concentration or the decrease of bio-sludge concentration. The system showed the highest removal efficiency with synthetic textile wastewater (STWW) containing 40 mg/L direct red 23 or direct blue 201 under MLSS of 3,000 mg/L and hydraulic retention time (HRT) of 7.5 days. But, the effluent NO(3)(-) was higher than that of the influent. Direct red 23 was more effective than direct blue 201 to repress the GAC-SBR system efficiency. The dyes removal efficiency of the system with STWW containing direct red 23 was reduced by 30% with the increase of direct red 23 from 40 mg/L to 160 mg/L. The system with raw textile wastewater (TWW) showed quite low BOD(5) TKN and dye removal efficiencies of only 64.7+/-4.9% and 50.2+/-6.9%, respectively. But its' efficiencies could be increased by adding carbon sources (BOD(5)). The dye removal efficiency with TWW was increased by 30% and 20% by adding glucose (TWW+glucose) or Thai rice noodle wastewater (TWW+TRNWW), respectively. SRT of the systems were 28+/-1 days and 31+/-2 days with TWW+glucose and TWW+TRNWW, respectively.
Sirianuntapiboon
Suntud
S
Department of Environmental Technology, School of Energy Environment and Materials, King Mongkut's University of Technology, Thonburi, Bangmod, Thung-kru, Bangkok 10140, Thailand. suntud.sir@kmutt.ac.th
Sansak
Jutarat
J
D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D019649:Food Industry; D007220:Industrial Waste / Q000032:analysis*; D017672:Nitrogen Compounds / Q000737:chemistry; D012275:Oryza / Q000737:chemistry; D012722:Sewage; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*
D004396:Coloring Agents; D007220:Industrial Waste; D017672:Nitrogen Compounds; D012722:Sewage; D002244:Carbon