Abstract:
The study are concerned in treatment of synthetic wastewater (SWW) containing Ni2+ and Pb2+ under hydraulic retention time
(HRT) of 3 days with various concentration of MLSS (2,000 4,500 mg/l). Also, the effect of Ni2+ and Pb2+ concentration
(5 50 mg/l) on the efficiency of sequencing batch reactor (SBR) system was investigated.
The results showed that the SBR system operated with MLSS of 4,500 mg/l gave the highest removal efficiency. The COD,
BOD5, TKN and Ni2+ removal efficiency of the system with SWW containing 5 mg/l Ni2+ were 87.6?0.4%, 96.2?0.1%,
97.6?0.1% and 85.0?0.1% , respectively. Also, the COD, BOD5, TKN and Pb2+ removal efficiency of the system with SWW
containing 5 mg/l Pb2+ were 92.8?0.0%, 96.3?0.1%, 98.2?0.3% and 86.0?0.1% , respectively. However the heavy metal
efficiency was decreased with the increase of Ni2+ and Pb2+ of up to 10 and 20 mg/l, respectively. But the concentration of heavy
metals did not affect to COD, BOD5, TKN removal efficiencies .
The SBR system showed very low removal efficiency with the raw wastewater from Lad Kaabang Industrial Estate. But, the
efficiency was increased by adding glucose into the wastewater. Also, the system could treat the raw wastewater containing
glucose to adjust the concentration BOD5 of 500 mg/l and Ni2+ and Pb2+ of 10 mg/l, respectively with high efficiency. The
COD, BOD5, TKN, Ni2+ and Pb2+ removal efficiency were 88.6?0.3%, 94.0?0.3%, 87.7?0.1%, 85.7?0.3% and 87.0
?0.1 %, respectively.