Pretreatments of Solid Wastes for Anaerobic Digestion and Its Importance for the Circular Economy

Vieira, Sabrina; Schneider, Jaíne; Burgos, Walter José Martinez; Magalhães, Antônio Irineudo; Medeiros, Adriane Bianchi Pedroni; Carvalho, Júlio César de; Vandenberghe, Luciana Porto de Souza; Soccol, Carlos Ricardo; Sydney, Eduardo Bittencourt

doi:10.1007/978-981-15-7525-9_5-1

Cited by 3 publications

(1 citation statement)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The secondary effluent or digestate from the AD process is left with a residual COD and important nutrients, such as ammonia and phosphate. Volatile fatty acids, such as acetic, butyric, propionic, and lactic acids [151,152], are coproducts of AD and are also responsible for the residual COD of the effluent and can be used as alternative sources of carbon. In addition, complex polymers produced in AD can be bioavailable to be used or harnessed in other processes.…”

Section: Secondary Effluents Compositionmentioning

confidence: 99%

Agro-Industrial Wastewaters for Algal Biomass Production, Bio-Based Products, and Biofuels in a Circular Bioeconomy

et al. 2022

View full text Add to dashboard Cite

Recycling bioresources is the only way to sustainably meet a growing world population’s food and energy needs. One of the ways to do so is by using agro-industry wastewater to cultivate microalgae. While the industrial production of microalgae requires large volumes of water, existing agro-industry processes generate large volumes of wastewater with eutrophicating nutrients and organic carbon that must be removed before recycling the water back into the environment. Coupling these two processes can benefit the flourishing microalgal industry, which requires water, and the agro-industry, which could gain extra revenue by converting a waste stream into a bioproduct. Microalgal biomass can be used to produce energy, nutritional biomass, and specialty products. However, there are challenges to establishing stable and circular processes, from microalgae selection and adaptation to pretreating and reclaiming energy from residues. This review discusses the potential of agro-industry residues for microalgal production, with a particular interest in the composition and the use of important primary (raw) and secondary (digestate) effluents generated in large volumes: sugarcane vinasse, palm oil mill effluent, cassava processing waster, abattoir wastewater, dairy processing wastewater, and aquaculture wastewater. It also overviews recent examples of microalgae production in residues and aspects of process integration and possible products, avoiding xenobiotics and heavy metal recycling. As virtually all agro-industries have boilers emitting CO2 that microalgae can use, and many industries could benefit from anaerobic digestion to reclaim energy from the effluents before microalgal cultivation, the use of gaseous effluents is also discussed in the text.

show abstract

Section: Secondary Effluents Compositionmentioning

confidence: 99%