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Enzymatic Hydrolysate of Palm Oil Mill Effluent as Potential Substrate for Bioflocculant BM-8 Production

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Abstract

Purpose

The aim of this study was to optimize the enzymatic hydrolysis of palm oil mill effluent (POME) to release fermentable sugar as a platform convertible to value-added product i.e. bioflocculant.

Methods

A Plackett–Burman design followed by a central composite design of response surface methodology was applied to optimize the enzymatic hydrolysis of POME to release fermentable sugars. Subsequently the enzymatic hydrolysate of POME was used to produce bioflocculant (BM-8) using POME-isolated Bacillus marisflavi NA8. The produced BM-8 was then characterized and its potential in microalgae harvesting was explored.

Results

Pure substrate (100%, v/v) dosed with 1% (v/v) enzyme and agitated at 200 rpm yielded optimum fermentable sugar from POME hydrolysate. Subsequently, the medium produced 9.72 g/L of BM-8 during 24 h of cultivation. The BM-8, which composed primarily of polysaccharide (74%) and protein (25%) with 1% nucleic acid was found to be thermally stable and able to withstand a wide pH range, with its optimum tolerance at pH 6. Additionally, the BM-8 was found efficient (90% biomass recovery in 30 min) for precipitation of Chlorella vulgaris, thus suggesting its great potential as a flocculating agent.

Conclusion

The study demonstrated that POME hydrolysate may be used as a cheap and renewable substrate for BM-8 production. In addition, BM-8’s flocculating capability showed it potential to substitute hazardous chemical flocculants.

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Acknowledgements

The authors thank the Malaysian Palm Oil Board (MPOB) for permission to publish the findings. Thanks are also due to the Malaysia Genome Institute (MGI) for providing the enzyme under Ministry of Agriculture No. TF0310F086, and Shanxi Tianli Jinrun Industrial Co. Ltd. for the chemical flocculants provided. The technical assistance provided by the interns and the staff of the Engineering and Processing Research Division of MPOB is also deeply appreciated.

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Authors and Affiliations

  1. Energy & Environment Unit, Engineering & Processing Research Division, Malaysian Palm Oil Board (MPOB), 6, Persiaran Institusi, Bandar Baru Bangi, 43000, Kajang, Selangor, Malaysia

    Nurul Adela Bukhari, Soh Kheang Loh & Abu Bakar Nasrin

  2. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    Jamaliah Md Jahim

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  1. Nurul Adela Bukhari
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Correspondence to Nurul Adela Bukhari.

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Bukhari, N.A., Loh, S.K., Nasrin, A.B. et al. Enzymatic Hydrolysate of Palm Oil Mill Effluent as Potential Substrate for Bioflocculant BM-8 Production. Waste Biomass Valor 11, 17–29 (2020). https://doi.org/10.1007/s12649-018-0421-8

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