Biochemical indicators of algal bloom in sewage-contaminated lakes.

Rao, SM and Anthony, P and Mogili Venkateswarlu, N (2019) Biochemical indicators of algal bloom in sewage-contaminated lakes. In: Journal of Hazardous, Toxic, and Radioactive Waste, 23 (4).

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Abstract

Pollution of Bengaluru lakes with partially treated sewage and stormwater runoffs has led to frequent algal blooms and fish kills in the lakes. This study examined the biochemical parameters of four polluted Bengaluru lakes to arrive at a proposal to control excess algal growth in the lakes. Results of the study indicate that during nonbloom conditions, the lakes classify as oligotrophic and mesotrophic lakes. During bloom conditions, the lakes mainly classify as eutrophic and hypereutrophic lakes. Reduction in bicarbonates, increase in pH, and insensitivity of chemical oxygen demand (COD) during algal growth experiments in the laboratory suggest the dominance of autotrophic algae in the lakes. Regulating COD levels of Bengaluru lakes at or below 15 mg/L is recommended to reduce microbial activity and associated bicarbonate production. Reduction in nutrients and bicarbonate levels will in turn control excess algal growth. Alkaline lake water from photosynthetic metabolism of algae causes precipitation of calcite, dolomite, and magnesite minerals and concomitant reduction in Ca, Mg, and bicarbonate ion concentrations in the lake water. © 2019 American Society of Civil Engineers.

Item Type:	Journal Article
Publication:	Journal of Hazardous, Toxic, and Radioactive Waste
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright for this article belongs to American Society of Civil Engineers.
Keywords:	Algae; Alkalinity; Calcite; Chemical oxygen demand; Eutrophication; Lakes; Magnesite; Magnesite mines; Organic carbon; Sewage, Biochemical indicators; Biochemical parameters; Concomitant reduction; Eutrophic; Hypereutrophic lakes; Ion concentrations; Microbial activities; Storm water runoff, Lake pollution, algal bloom; bicarbonate; biochemical composition; bioindicator; eutrophication; lake pollution; sewage, Bengaluru; India; Karnataka, algae
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	05 Jan 2023 09:35
Last Modified:	05 Jan 2023 09:35
URI:	https://eprints.iisc.ac.in/id/eprint/78786

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