Treatment of Saline Wastewater Containing a High Concentration of Salt Using Marine Bacteria and Aerobic Granule Sludge

摘要

This study develops an ecofriendly and inexpensive biological treatment for high-salinity wastewater. The marine bacteria Bacillus sp. KGN1 and Vibrio sp. KGP1 show removal efficiencies of 75.3 and 65.4% for chemical oxygen demand by the dichromate method (CODCr), 91.3 and 92.0% for NH 3 -N (ammoniacal nitrogen), and 90.6 and 84.6% for PO3-4 -P (phosphate), respectively, during batch mode for 12 h in 3.5% saline artificial wastewater. The lab-scale sequencing batch reactor (SBR) system with marine bacteriasupplemented aerobic granule sludge (AGS) is operated under the following conditions: 12 h hydraulic retention time (HRT), 20 days solid retention time (SRT), 6 h per cycle, 3,000 mg L-1 mixed liquid volatile suspended solid (MLVSS), and 80 Ld-1 treatment amount per day (Q). The system has an average CODCr removal efficiency of 79.8%, a NH3- N removal efficiency of 91.5%, and a PO3-4 -P removal efficiency of 76.5% in 3.5% saline synthetic wastewater including 400 mg CODCr L-1, 10 mg NH 3 -N L-1, and 5 mg PO3-4 -P L-1. The results indicate that the SBR biological system with AGS supplemented with high-efficiency marine bacteria is effective for treating saline wastewater containing a high concentration of salt. (C) 2018 American Society of Civil Engineers.