Performance Evaluation of Hybrid Coagulation/Nanofiltration Process for AT-POME Treatment

Authors

1 Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.

2 School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.

3 Faculty of Science and Industry Technology, Prince of Songkla University, Surat Thani Campus, 84000 Surat Thani, Thailand

Abstract

The presence of lignin and its degraded products such as tannin and humic acids is the main reason causing the aerobically-treated palm oil mill effluent (AT-POME) to display colour at the point of discharge. In this work, a hybrid method is developed to treat the AT-POME sample that was conventionally treated by biological method. This hybrid method combines coagulation and nanofiltration (NF) membrane process is used to treat the industrial effluent in which the coagulation is conducted prior to NF process. The effects of several variables during coagulation process, i.e., alum concentration, decolouring polymer dosage, cationic polymer dosage and pH on the colour removal and sludge volume production are investigated using response surface methodology (RSM). Optimum variable conditions are chosen to prepare samples with maximum colour rejection and minimum sludge volume for further treatment using the NF membrane process. Under the optimum coagulation conditions (50 mg/L alum, 441 mg/L decolouring polymer, 534 mg/L cationic polymer and pH 9.2), the results showed 92% colour removal with sludge volume as low as 4.1 mL. Further treatment using commercial NF membranes indicated that a permeate sample with complete elimination of colour (almost 100% colour removal) could be produced with reasonably high water flux.

Keywords

References

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International Journal of Engineering
Volume 31, Issue 8
TRANSACTIONS B: Applications
August 2018
Pages 1430-1436

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