Influence of temperature and pretreatments on the anaerobic digestion of wastewater grown microalgae in a laboratory-scale accumulating-volume reactor

Kinnunen, Viljami; Craggs, Rupert J.; Rintala, Jukka

doi:10.1016/j.watres.2014.03.043

Cited by 55 publications

(21 citation statements)

References 22 publications

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“…Since lipids extraction efficiency is easier to control than cell lipid content, this value was assumed to be constant (25%). In the scenarios 1, 6 and 7, the efficiency of anaerobic digestion (45%, 30% and 60%, respectively) was compared, since different studies have reported anaerobic digestion efficiencies within this range of values [51,52]. …”

Section: Scenarios Descriptionmentioning

confidence: 99%

Integration of Microalgae-Based Bioenergy Production into a Petrochemical Complex: Techno-Economic Assessment

et al. 2016

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Abstract:The rapid development of modern society has resulted in an increased demand for energy, mainly from fossil fuels. The use of this source of energy has led to the accumulation of carbon dioxide (CO 2 ) in the atmosphere. In this context, microalgae culturing may be an effective solution to reduce the CO 2 concentration in the atmosphere, since these microorganisms can capture CO 2 and, simultaneously, produce bioenergy. This work consists of a techno-economic assessment of a microalgal production facility integrated in a petrochemical complex, in which established infrastructure allows efficient material and energy transport. Seven different scenarios were considered regarding photosynthetic, lipids extraction and anaerobic digestion efficiencies. This analysis has demonstrated six economically viable scenarios able to: (i) reduce CO 2 emissions from a thermoelectric power plant; (ii) treat domestic wastewaters (which were used as culture medium); and (iii) produce lipids and electrical and thermal energy. For a 100-ha facility, considering a photosynthetic efficiency of 3%, a lipids extraction efficiency of 75% and an anaerobic digestion efficiency of 45% (scenario 3), an economically viable process was obtained (net present value of 22.6 million euros), being effective in both CO 2 removal (accounting for 1.1ˆ10 4 t per year) and energy production (annual energy produced was 1.6ˆ10 7 kWh and annual lipids productivity was 1.9ˆ10 3 m 3 ).

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Section: Scenarios Descriptionmentioning

confidence: 99%

Integration of Microalgae-Based Bioenergy Production into a Petrochemical Complex: Techno-Economic Assessment

et al. 2016

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“…Those studies investigating the importance of storage effects on microalgal biomass on CH 4 yield have come to similar conclusions. Kinnunen et al [23] observed positive effects on the CH 4 yields of a freeze-thawed microalgae biomass mix (fresh: 103 Nm 3 t −1 VS; frozen: 155 Nm 3 t −1 VS, +50%), which was cultivated in wastewater and subsequently digested under psychrophilic conditions (20°C) in accumulating-volume reactors. In another experiment of the same study, a similar effect was observed under mesophilic conditions (37°C) in continuously stirred tank reactors, where untreated biomass yielded 179 Nm 3 t −1 VS compared to frozen biomass 205 Nm 3 t −1 VS (+14%).…”

Section: Biomass Storage: a First Indirect Pretreatment Step?mentioning

confidence: 99%

“…In addition, several pretreatment methods were tested, including thermal treatment, ultrasonication, enzymatic degradation, milling, and a combined approach using milling and enzymes. For experimental purposes, a well-defined strain, i.e., SAG 276-1 A. obliquus (Turpin) Hegewald & Hanagata (formerly referred to as Scenedesmus obliquus (Turpin) Kützing) based on ITS1/5.8S/ITS2 (=ribosomal DNA) [21,22] was used, in contrast to other studies, which used a mix of microalgae of an undefined molecular phylogeny [11,[13][14][15]23]. A. obliquus has already been used as a biomass source for AD in previous experiments [7,24].…”

Section: Introductionmentioning

confidence: 99%

Acutodesmus obliquus as a benchmark strain for evaluating methane production from microalgae: Influence of different storage and pretreatment methods on biogas yield

Gruber-Brunhumer

Jerney

Zohar³

et al. 2015

Algal Research

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“…In addition, biodegradability was increased from 38% to 48%. Kinnunen et al studied freeze‐thaw pretreatment to microalgae mix culture ( Pediastrum sp., Micractinium sp., and Scenedesmus sp.) with 20°C for 24 hours and concluded that freeze‐thaw treatment increased protein hydrolysis and ultimate methane yields improved from 179 to 227 mL CH 4 /g VS added when compared with untreated microalgae.…”

Section: Pretreatment Methods Applied To Microalgal Biomassmentioning

confidence: 99%

A comprehensive review on pretreatment of microalgae for biogas production

Çakmak

Uğurlu

2018

Int J Energy Res

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Summary Use of microalgal biomass for renewable energy production has gained considerable attention in the world due to increasing global energy demand and negative environmental impacts of nonrenewable fossil fuels. Anaerobic digestion is one of the renewable technologies that microalgal biomass is converted into biogas by anaerobic archea. One of the main drawbacks of using microalgal biomass for biogas production is that certain types of microalgae has rigid cell wall characteristics, which limits accessibility of anaerobic archea to microalgal intracellular organic matter during hydrolysis phase. This limitation lowers efficiency of biogas production from microalgal biomass. However, introducing pretreatment methods prior to anaerobic digestion provides disruption of rigid microalgal cell wall and improve biogas yields from microalgal biomass. The objective of this paper was to review current knowledge related to pretreatment methods applied prior to anaerobic digestion of microalgal biomass. Efficiency and applicability of pretreatment methods mainly depend on type of microalgae, cell wall characteristics, and cost and energy requirements during pretreatment process. In this review, various type of pretreatment methods applied to microalgal biomass was discussed in detail with background knowledge and literature studies in their potential on maximization of biogas yields and their cost effectiveness, which is important for large‐scale applications. In the view of current knowledge, it was concluded that each pretreatment method has a relative contribution to improvement in biogas production depending on the type of microalgae. However, energy and cost requirements are the main limitations for pretreatment. So, further studies should focus on reduction of cost and energy demand by introducing combined methods, novel chemicals, and on‐site or immobilized enzymes in pretreatment to increase feasibility of pretreatment prior to anaerobic digestion in industrial scale.

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Influence of temperature and pretreatments on the anaerobic digestion of wastewater grown microalgae in a laboratory-scale accumulating-volume reactor

Cited by 55 publications

References 22 publications

Integration of Microalgae-Based Bioenergy Production into a Petrochemical Complex: Techno-Economic Assessment

Integration of Microalgae-Based Bioenergy Production into a Petrochemical Complex: Techno-Economic Assessment

Acutodesmus obliquus as a benchmark strain for evaluating methane production from microalgae: Influence of different storage and pretreatment methods on biogas yield

A comprehensive review on pretreatment of microalgae for biogas production

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