Application of Response Surface Methodology (RSM) for Optimization of COD Removal from POME by Activated Sludge Simulation Program (ASIM)

Reno Susanto; Budiman Batara; Said Zul Amraini; Tjandra Setiadi

Authors

Reno Susanto Chemical Engineering, Faculty of Industrial Technology, Bandung Institute of Technology
Budiman Batara Chemical Engineering, Faculty of Engineering, University of Riau
Said Zul Amraini
Tjandra Setiadi

Keywords:

ASIM, COD, WWTP, RSM

Abstract

Indonesia is the world's biggest producer at a time as an exporter of palm oil. Palm oil processing is implemented in palm oil mills, where the oil is extracted from palm fruit bunches. A major amount of water is utilized during the extraction of crude palm oil from fresh fruit bunches, and about 50% of this water is generated as palm oil mill effluent (POME). POME is a viscous liquid that conceives upper amounts of contaminants such as COD, BOD, TSS, and Ammonia. Exile of this highly defacing waste becomes a significant matter if it is not handled accurately other than the strict standard limits imposed by the Indonesian Ministry of Environment. In this research, a simulation of the POME Activated Sludge Simulation (ASIM) waste treatment process will be carried out to determine the optimum process for treating POME. POME processing is carried out with 4 main process equipment units, namely anaerobic tanks, anoxic tanks, aeration tanks and clarifiers. The experimental design was carried out utilizing the Standard Response Surface Method (RSM) design, namely the 2-level factorial 2³ design to decide the optimum process variable for COD removal using Minitab v.20 software. Influent data were obtained from PTPN V Sei Pagar, Riau Province with water quality standards waste based on the 2014 LH Regulation, namely COD 500 mg/L. The variables used in this research are HRT, recirculation rate, and sludge retention time. The research results can be used to design the WWTP for the Palm Oil Industry. The outcomes clearly showed that HRT, SRT, and IRR had a significant impact on the COD elimination of POME. From the optimization, the maximum COD removal efficiency was derived at initial SRT 8,63 hours, HRT 5,07 hours and IRR 1,75Q.

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