Phycoremediation of milk processing wastewater and lipid-rich biomass production using Chlorella vulgaris under continuous batch system

Verma, Rashmi and Suthar, Surindra and Chand, Naveen and Mutiyar, Pravin K. (2022) Phycoremediation of milk processing wastewater and lipid-rich biomass production using Chlorella vulgaris under continuous batch system. In: Science of The Total Environment, 833 . ISSN 00489697

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Abstract

This study compiles the results of phycoremediation of milk processing wastewater (MPWW) and production of lipid-rich Chlorella vulgaris biomass using a continuous batch system operated for 12-wks. After a 4-wks interval, a new MPWW was loaded photobioreactor to provide appropriate nutrient supply to algae. Results indicated that MPWW supported the algal growth efficiently and the maximum algal growth was recorded in the ranges of 400.36 to 421.58 mg L−1 during 4-wks of the cultivation cycle. Average reduction in total nitrogen, TN (45.82–69.18%); nitrate, NO3 (93.32–94.54%); total ammonium nitrogen, TAN (92.94–94.54%); sulphate, SO4−2 (85.13–87.34%); total phosphorus (75.09–78.78%); and biochemical oxygen demands, BOD (89.53–92.40%) was recorded during 12-wks phycoremediation of MPWW. Harvested algal biomass (dry weight basis, DW) exhibited a significant content of total sugar (45.5%) and total lipid (39.7%). The lipid profiling results indicated the presence of palmitic acid (39.9%), oleic acid (21.08%), linoleic acid (13.13%), and other C18 compounds in algal biomass, suggesting the suitability of MPWW for Chlorella vulgaris cultivations. Algal biomass exhibited a high heating value (MJ/Kg of DW) in the range of 17.3 to 25.1, comparable to other lignocellulose biomass to be used for bioenergy purposes. Results of this study indicate that MPWW could be utilized as a valuable medium for Chlorella vulgaris cultivation under a circular economy approach: wastewater treatment and bioenergy feedstock production. The effect of controlled environmental conditions on algal growth behavior and lipid composition in biomass, while using MPWW as a medium, could be investigated in future studies

Item Type:	Journal Article
Publication:	Science of The Total Environment
Publisher:	Elsevier B.V.
Additional Information:	The copyright of this article belongs to the Elsevier B.V.
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Society and Policy (formerly: Centre for Contemporary Studies)
Date Deposited:	23 May 2022 05:14
Last Modified:	23 May 2022 05:14
URI:	https://eprints.iisc.ac.in/id/eprint/72314

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