The Multifaceted Microalgal Approach to Wastewater Treatment to Generate Energy and Essential Chemicals

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Micro-algae: Next-generation Feedstock for Biorefineries

Abstract

The biological state-of-the-art purification of wastewaters has gained momentum in recent times. The microalgal capability to reduce N and P contaminants, as well as chemical oxygen demand (COD), is implemented in wastewater treatment processes. This green microalgal strategy to integrate wastewater treatment and to achieve better energy efficiency mainly depends on the purpose, scalability, nutrient uptake of algal species and economic feasibility. Therefore, the microalgal approach is sustainable as compared to conventional methods of wastewater treatments because it generates no toxic waste and can grow in limited resources to meet the soaring energy demand of the world. In this chapter, we discuss the successful trials on pretreatment methods employing microalgae to treat a variety of wastewaters based on a different selection criterion. Further, we focused on different microalgae cultivation systems with an emphasis on their benefits and drawbacks. Then, a brief evaluation of the microalgae biorefinery technologies was done to generate renewable energy and high-value chemicals. Lastly, the challenges faced in integrated microalgal wastewater treatment processes were outlined for wide-scale applications on bioenergy production.

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Abbreviations

BOD:

biological oxygen demand

COD:

chemical oxygen demand

MBWT:

microalgae-based wastewater treatment

OP:

orthophosphates

GS/GOGAT:

glutamine synthetase/glutamine oxoglutarate aminotransferase

GDH:

glutamate dehydrogenase

PWWs:

piggery wastewaters

HRAP:

high-rate algal pond

WWT HRAP:

wastewater treatment HRAP

CSYE:

cattle standing yard effluent

WSP:

waste stabilisation ponds

PBR:

photobioreactor

ATS:

algal turf scrubbers

AMD:

acid mine drainage

MFCs:

microbial fuel cells

EAB:

electrochemically active bacteria

ASP:

activated sludge process

PMFCs:

photosynthetic microbial fuel cells

SMFCs:

sediment microbial fuel cell

EET:

extracellular electron transfer

RNG:

renewable natural gas

CNG:

compressed natural gas

LNG:

liquefied natural gas

LBM:

liquefied biomethane

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All the authors declare that they have no competing interests.

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Correspondence to Meenakshi Singh .

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Parambath, S.D., Bhombal, Y., Kumar, A., Singh, M., Chavali, M., Chandrasekhar, K. (2022). The Multifaceted Microalgal Approach to Wastewater Treatment to Generate Energy and Essential Chemicals. In: Verma, P. (eds) Micro-algae: Next-generation Feedstock for Biorefineries. Clean Energy Production Technologies. Springer, Singapore. https://doi.org/10.1007/978-981-19-0793-7_6

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