A Study of the Treatment Efficiency for the Ozonation Effluent Recycling Process in Cassava Starch Factory

Abstract

The research was to determine the treatment efficiency for the ozonation effluent recycling process in cassava starch factory. Also, the flow rate entering the process was measured continuously during operating the process. In the process, there were mainly four major components: Section 1, effluent storage pond, Section 2, algae filtration system, Section 3 ozone tank and decomposing pond, Section 4 sedimentation tank and sand filter pond.  From study results, it was found that the average flow rate entering the process was 197.86±5.23 m³/hr.  Effluent characteristics (before and after) of the ozonation effluent recycling process found that the average pH, total dissolved solid (TDS), chemical oxygen demand (COD) and the suspended solids (SS) were 9.19±0.03 and 8.13±0.03, 2,344±15.00 and 2,445±13.00 mg/l, 213±2.21. and 83±6.31 mg/l, and 112±5.87 and 15±4.39 mg/l, respectively. For COD and SS removal efficiency, the averaged percentages were equal to 61% and 87%, respectively. Overall, all parameters of the treated effluent passed the industrial effluent standard. However, the treated effluent was only used for washing raw cassava due to a quite high TDS. Therefore, a further study on a quality-improvement of the treated effluent, especially TDS, needs to be considered.