Comparative study on treatment of kitchen wastewater using a mixed microalgal culture and an aerobic bacterial culture: kinetic evaluation and FAME analysis

Katam, Keerthi; Bhattacharyya, Debraj

doi:10.1007/s11356-018-2209-6

Research Article
Published: 12 May 2018

Comparative study on treatment of kitchen wastewater using a mixed microalgal culture and an aerobic bacterial culture: kinetic evaluation and FAME analysis

Keerthi Katam¹ &
Debraj Bhattacharyya²

Environmental Science and Pollution Research volume 25, pages 20732–20742 (2018)Cite this article

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Abstract

Microalgae-based treatment systems have been successfully used for the polishing of domestic wastewater. Research is underway in studying the suitability of using these systems as main treatment units. This study focuses on comparing the performances of a mixed microalgal culture and an aerobic bacterial culture, based on the kinetic evaluation, in removing organic carbon from a kitchen wastewater. The two systems were operated at six different solid retention times (SRTs)—2, 4, 6, 8, 10, and 12 days in continuous mode. The influent and effluent samples were analyzed for chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), phosphates, and surfactants. Steady-state kinetics (k, K_s, Y, and k_d) for organic carbon removal were obtained by fitting experimental data in linearized Michaelis-Menten and Monod equations. The mixed microalgal system showed similar or better performance in COD and TN removal (88 and 85%, respectively) when compared with the COD and TN removal by the aerobic bacterial system (89 and 48%). A maximum lipid yield of 40% (w/w of dry biomass) was observed in the microalgal system. Saturated fatty acids accounted for 50% of the total observed FAME species. The study indicates that the mixed microalgal culture is capable of treating kitchen wastewater and has the potential to replace aerobic bacteria in biological treatment systems in certain cases.

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Research Scholar, Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Telangana, 502285, India
Keerthi Katam
Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Telangana, 502285, India
Debraj Bhattacharyya

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Keerthi Katam
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Debraj Bhattacharyya
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Correspondence to Debraj Bhattacharyya.

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Katam, K., Bhattacharyya, D. Comparative study on treatment of kitchen wastewater using a mixed microalgal culture and an aerobic bacterial culture: kinetic evaluation and FAME analysis. Environ Sci Pollut Res 25, 20732–20742 (2018). https://doi.org/10.1007/s11356-018-2209-6

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Received: 02 October 2017
Accepted: 01 May 2018
Published: 12 May 2018
Issue Date: July 2018
DOI: https://doi.org/10.1007/s11356-018-2209-6

Keywords

Aerobic bacteria
Biodiesel
FAME
Kinetic coefficients
Mixed microalgae
Wastewater treatment