Abstract

Wastewater form coconut candy production in Ben Tre have characteristics as low pH= 3.9-4.2; high organic substances pollution with COD= 8.625 –13.875 mg/1, BODs= 5.350 – 8.500 mg/l, vefetable oil = 284 – 306 mg/l, nitrogen pollution. However, there has not been proper wastewater treatment. As a result, wastewater from coconut candy productin may be the main source of polution to Ham Luong river - a domestic water supply source. This research introduce a effective method for treatment of coconut candy production wastewater, which has low investment, low runing cost, simple operation. The treatment method is based on oil removal by deposit device with sloping partition, anaerobic biofiltration with 2-day-stored (70% productivity), aerobic biofiltration with 1-day-stored (97% productivity), using coconut fiber. The water after treatment has quality of colunm B TCVN 5945-2005. In order to reach column A quality, it is necessary to treat the water futher with sand filtration pond, activated charcoal or bio-pond according to production area.