Reuse of effluent from submerged contact biodisk aerator by chemical coagulation process with polyaluminum chloride
1995
Unchalee Nimanussornkul
This experiment was focused on the reuse of wastewater from juice industry after treated through the Submerged Contact Biodisk Aerator by chemical coagulation process with polyaluminum chloride (PAC) as coagulant. The study was devided into two parts. The frist part was conducted to determine the optimum dosage of PAC by using the jar test experiment. The second part was performed full scale in a wastewater treatment plant. The results of jar test showed that the optimum dose of PAC was equal 0.03 mg/l, averaged pH of the effluent was 6.62 and removal effciency of turbidity, color, suspended solids, BOD and COD were 98.84 percent, 100 percent, 99.54 percent, 65.61 percent and 62.54 percent, respectively. The concentration of residual aluminium was 280.51 micro. Furthermore, the effectiveness of PAC was quite good when used in the pH range of 4 to 10. In this pH range, the removal efficiency of turbidity, color and suspended solids were 94.14-99.11 percent, 78.75-100 percent and 97.30-99.93 percent, respectively. When PAC in the concentration of 0.03 mg/l was used full scale in a continuously operating wastewater treatment plant, it was found that the removal efficiency of turbidity, color, suspended solids, BOD and COD were 99.06 percent, 94.38 percent, 98.97 percent, 53.57 percent and 51.02 percent, respectively. The concentration of residual aluminium in the effluent from treatment plant was 209.57 micro. It has concluded that PAC was the effective coagulant which could be used in the turbidity removal by reducing the colloid particles in the water. The treated water can be used for gardening and floor cleaning.
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