Recent progress in microalgal biomass production coupled with wastewater treatment for biofuel generation. (November 2017)

• Record Type: Journal Article
• Authors: Salama, El-Sayed; Kurade, Mayur B.; Abou-Shanab, Reda A.I.; El-Dalatony, Marwa M.; Yang, Il-Seung; Min, Booki; Jeon, Byong-Hun
• Is Part Of: Renewable & sustainable energy reviews. Volume 79(2017)
• Page Start: 1189
• Page End: 1211
• Publication Date: 2017-11
• Subjects: CAPEX Capital expenditures -- OPEX Operational expenditures -- OP Open pond -- PBRs Photobioreactors -- POPs Persistent organic pollutants -- EOCs Emerging organic contaminants -- HRAPs High-rate microalgal ponds -- HRT Hydraulic residence time -- NADH Nicotinamide adenine dinucleotide -- ATP Adenosine triphosphate -- Glu Glutamate -- ADP Adenosine diphosphate -- PSUs Photosynthesis structure units -- BOD Biological O2 demand -- COD Chemical oxygen demand -- AD Anaerobic digestion -- ATS An algal turf scrubber -- ANA All Nippon Airways; -- TAGs Triglycerides -- TFAs Total fatty acids -- USFAs Unsaturated fatty acids -- CMW Concentration municipal wastewater -- WWTP Wastewater treatment plant -- TKN Total Kjeldahl nitrogen; Microalgae -- Biomass -- Wastewater treatment -- Nutrient removal -- Bioremediation -- Massive cultivation -- Open system -- Close system -- Biofuel; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2017.05.091
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: Microalgae are a potential source of sustainable biomass feedstock for biofuel generation, and can proliferate under versatile environmental conditions. Mass cultivation of microalgae is the most overpriced and technically challenging step in microalgal biofuel generation. Wastewater is an available source of the water plus nutrients necessary for algae cultivation. Microalgae provide a cost-effective and sustainable means of advanced (waste)water treatment with the simultaneous production of commercially valuable products. Microalgae show higher efficiency in nutrient removal than other microorganisms because the nutrients (ammonia, nitrate, phosphate, urea and trace elements) present in various wastewaters are essential for microalgal growth. Potential progress in the area of microalgal cultivation coupled with wastewater treatment in open and closed systems has led to an improvement in algal biomass production. However, significant efforts are still required for the development and optimization of a coupled system to simultaneously generate biomass and treat wastewater. In this review, the systematic description of the technologies required for the successful integration of wastewater treatment and cultivation of microalgae for biomass production toward biofuel generation was discussed. It deeply reviews the microalgae-mediated treatment of different wastewaters (including municipal, piggery/swine, industrial, and anaerobic wastewater), and highlight the wastewater characteristics suitable for microalgae cultivation. Various pretreatment methods (such as filtration, autoclaving, UV application, and dilution) needed for wastewater prior to its use for microalgae cultivation have been discussed. The selection of potential microalgae species that can grow in wastewater and generate a large amount of biomass has been considered. Discussion on microalgal cultivation systems (including raceways, photobioreactors, turf scrubbers, and hybrid systems) that use wastewater, evaluating the capital expenditures (CAPEX) and operational expenditures (OPEX) of each system was reported. In view of the limitations of recent studies, the future directions for integrated wastewater treatment and microalgae biomass production for industrial applications were suggested. Highlights: Challenges in using wastewater for microalgae cultivation and biomass production. Treatment of different wastewaters and reuse of the treated water. Recovery of valuable nutrients (N/P) and removal of organic pollutants. Application of wastewater in raceways, photobioreactors, turf scrubbers, and hybrid systems. Genetically engineered microalgae for efficient wastewater treatment.