Kinetic of Biogas Production in a Batch Anaerobic Digestion Process with Interference of Preservative Material of Sodium Benzoate

*Indro Sumantri orcid scopus  -  Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia
Hadiyanto Hadiyanto scopus  -  Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia
Received: 11 Nov 2020; Revised: 20 Dec 2020; Accepted: 21 Dec 2020; Published: 28 Dec 2020; Available online: 22 Dec 2020.
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Sodium benzoate is a preservative compounds which are widely used for both food and beverage products. The treatment of waste water containing this compound was normally conducted in a anaerobic digestion (AD) using a batch reactor system at a room temperature. The anaerobic process eventually produced biogas which can be used for bioenergy. This research was aimed to evaluate the production of biogas from by synthetic solution models containing sodium benzoate (SB). The experiment was performed in a variation of Mixed Liquor Suspended Solid (MLSS) of 4.8 and 7.2 g/L, and initial sodium benzoate concentration of 400, 600, and 800 mg/L. The digestion was performed at 60 days, while the biogas content was measured every 2 days. The results indicated a reduction in the cumulative biogas by the addition of sodium benzoate, compared to the control condition. Moreover, the decrease in organic loading rate (OLR) of SB in wastewater follows the first order kinetic with kinetic rate constant (k) was 0.0432 to 0.1254 (day1) for MLSS of 4.8 g/L and 0.0276 to 0.0372 (day1) for 7.2 g/L MLSS. Copyright © 2020 BCREC Group. All rights reserved


Keywords: sodium benzoate; anaerobic digestion; biogas; first-order kinetic; batch
Funding: Universitas Diponegoro

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