Optimization of Temperature and Inoculum Size for Phycoremediation of Paddy-Soaked Rice Mill Wastewater
Publication: Journal of Environmental Engineering
Volume 146, Issue 1
Abstract
Phycoremediation encompasses microalgae as a sustainable treatment system by integrating the wastewater treatment with bioenergy recovery. However, transforming this technology to real time from lab scale is limited due to temperature and cell volume (inoculum size). Thus, the present study aims to investigate the influence of inoculum size (10%–30% v/v) and temperature condition (25°C–35°C) for the growth of five microalgal species in paddy-soaked wastewater (PSWW), using response surface methodology (RSM). The optimal conditions for better biomass production and wastewater treatment were found to be at 25°C and 30% inoculum size. Among five selected microalgae, Chlorella pyrenoidosa exhibited maximum dry biomass content () with greater () removal on ammonical nitrogen () and phosphates () at a rate of 0.025 and of dry biomass, respectively, with significant value (). Similar results were obtained for Chlorella vulgaris and Scenedesmus obliquus (an indigenous sp.) with more than 80% removal efficiency. However, at higher temperatures, Chlorella pyrenoidosa exhibited better results when other strains failed to maintain biomass production and removal on and . This study demonstrated that phycoremediation is a viable option upon selecting appropriate strains and conditions imminent for scale-up applications.
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Acknowledgments
The authors acknowledge the financial support provided by the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India under the grant YSS/2015/000527. Also, the authors would like to thank Dr. Srinivasan R., Research Associate, Metabolic Engineering group, International Centre for Genetic Engineering and Biotechnology, New Delhi, for support in the sequencing process of indigenous species.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 8, 2019
Accepted: May 6, 2019
Published online: Oct 23, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 23, 2020
Authors
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