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Evaluation of Pre-Chlorinated Wastewater Effluent for Microalgal Cultivation and Biodiesel Production

文献类型： 外文期刊

作者： Odjadjare, Ejovwokoghene Collins 1 ; Mutanda, Taurai 2 ; Chen, Yi-Feng 3 ; Olaniran, Ademola O. 1 ;

作者机构： 1.Univ KwaZulu Natal, Coll Agr Engn & Sci, Sch Life Sci, Discipline Microbiol, Westville Campus,Private Bag X54001, ZA-4041 Durban, South Africa

2.Mangosuthu Univ Technol, Nat Conservat Dept, Ctr Algal Biotechnol, POB 12363, ZA-4026 Durban, South Africa

3.Jiangsu Acad Agr Sci, Lab Biosyst Engn, Inst Biotechnol, Nanjing 210014, Jiangsu, Peoples R China

关键词： wastewater; wastewater treatment plant; microalgae; biodiesel; effluent

期刊名称：WATER （ 影响因子：3.103； 五年影响因子：3.229 ）

ISSN： 2073-4441

年卷期： 2018 年 10 卷 8 期

页码：

收录情况： SCI

摘要： Microalgae are promising feedstock to produce biodiesel and other value added products. However, the water footprint for producing microalgal biodiesel is enormous and would put a strain on the water resources of water stressed countries like South Africa if freshwater is used without recycling. This study evaluates the utilization of pre-chlorinated wastewater as a cheap growth media for microalgal biomass propagation with the aim of producing biodiesel whilst simultaneously remediating the wastewater. Wastewater was collected from two wastewater treatment plants (WWTPs) in Durban, inoculated with Neochloris aquatica and Asterarcys quadricellulare and the growth kinetics monitored for a period of 8 days. The physicochemical parameters; including chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were determined before microalgal cultivation and after harvesting. Total lipids were quantified gravimetrically after extraction by hexane/isopropanol (3:2 v/v). Biodiesel was produced by transesterification and characterised by gas chromatography. The total carbohydrate was extracted by acid hydrolysis and quantified by spectrophotometric method based on aldehyde functional group derivatization. Asterarcys quadricellulare utilized the wastewater for growth and reduced the COD of the wastewater effluent from the Umbilo WWTP by 12.4%. Total nitrogen (TN) and phosphorus (TP) were reduced by 48% and 50% respectively by Asterarcys quadricellulare cultivated in sterile wastewater while, Neochloris reduced the TP by 37% and TN by 29%. Although the highest biomass yield (460 mg dry weight) was obtained for Asterarcys, the highest amount of lipid (14.85 +/- 1.63 mg L-1) and carbohydrate (14.84 +/- 0.1 mg L-1) content were recorded in Neochloris aquatica. The dominant fatty acids in the microalgae were palmitic acid (C16:0), stearic acid (C18:0) and oleic acid (C18:1). The biodiesel produced was determined to be of good quality with high oxidation stability and low viscosity, and conformed to the American society for testing and materials (ASTM) guidelines.

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