The kinetics of tempeh wastewater treatment using Arthrospira platensis

Riadi, Lieke and Askitosari, Theresia Desy and Widhi, Ragil Puspita Dutaning and Laurensia, Melvina and Agustin, Yuana Elly and arifin, yalun (2021) The kinetics of tempeh wastewater treatment using Arthrospira platensis. Water Science and Technology, 83 (12). pp. 2997-3006. ISSN 0273-1223

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The microalga Arthrospira platensis (Spirulina) was used for tempeh wastewater treatment. Microalga growth and the kinetics of chemical oxygen demand (COD) degradation under different light intensities (2,100 and 4,300 lux), tempeh wastewater concentrations (0, 0.5, 1, 1.5% v/v), and sodium nitrate concentrations (0, 0.75, 1, 2, 2.5 g/L) were studied. Improved cell growth in wastewater indicated that mixotrophic growth was preferred. The addition of sodium nitrate up to 2 g/L increased COD removal. The highest COD removal was 92.2%, which was obtained from cultivation with 1% v/v tempeh wastewater, 2 g/L sodium nitrate, 2,100 lux, and the specific growth rate of 0.33±0.01 day�1. The COD removal followed a pseudo-first-order kinetic model with the kinetic constant of 0.3748 day�1 and the nitrate uptake rate of 0.122 g/L-day. The results can be used to design a pilot-scale tempeh wastewater treatment facility using A. platensis for tertiary treatment. Based on the kinetic model, a 20 m3 reactor can treat tempeh wastewater to reduce the COD from 400 to 100 ppm in 4 days and produces approximately 32.8 kg of dried microalgae.

Item Type: Article
Uncontrolled Keywords: Arthrospira platensis, COD degradation, kinetic model, microalgae, tempeh wastewater
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Lieke Riadi 6116
Date Deposited: 28 Jul 2021 03:37
Last Modified: 06 Aug 2021 08:58

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