An overview of bio augmentation of methane by anaerobic co-digestion of municipal sludge along with microalgae and waste paper

Ajeej, Amritha; Thanikal, Joseph V.; Narayanan, C. M.; Kumar, Roopesh

doi:10.1016/j.rser.2015.04.121

Cited by 52 publications

(23 citation statements)

References 35 publications

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“…Based on energy balance and energetic recovery of cell biomass, it is better to transfer the biomass with less than 40% lipid content directly into the anaerobic digestion process with the kitchen waste, which could also improve the methane yield by a reduction of the carbon-to-nitrogen ratio in the digester. The enhancement in the methane yield is normal in co-digestion of algae with other digester feedstocks, because the high nitrogen content in algae could improve the digestibility of carbon-rich substrate [61], like kitchen waste with high ratio of carbon to nitrogen [62]. …”

Section: Resultsmentioning

confidence: 99%

“…7 combines algae-based biofuel production with ADE-KW treatment and forms a cycle where almost no nitrogen or phosphorus is lost. Ajeej et al proposed that coupling wastewater treatment with the microalgae culture was a promising avenue toward the production of renewable biodiesel or biogas [61]. Moreover, the concept plant based on a kitchen waste treatment plant takes full advantage of the existing transesterification and anaerobic digestion infrastructure, which could mitigate some environmental and economic burdens.…”

Section: Resultsmentioning

confidence: 99%

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Toward facilitating microalgae cope with effluent from anaerobic digestion of kitchen waste: the art of agricultural phytohormones

Pei

Jiang

Hou

et al. 2017

Biotechnol Biofuels

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BackgroundAlthough numerous studies have used wastewater as substitutes to cultivate microalgae, most of them obtained weaker algal viability than standard media. Some studies demonstrated a promotion of phytohormones on algal growth in standard media. For exploiting a strategy to improve algal biomass accumulation in effluent from anaerobic digestion of kitchen waste (ADE-KW), the agricultural phytohormones gibberellin, indole-3-acetic acid, and brassinolide (GIB) were applied to Chlorella SDEC-11 and Scenedesmus SDEC-13 at different stages of algal growth. Previous studies have demonstrated a promotion of phytohormones on algal growth in standard media, but attempts have been scarce, focusing on wastewater cultivation system. In addition, the effects of wastewater on algal morphology and ultrastructure have not been revealed so far, much less on the mechanism of the role of phytohormones on algae.ResultsADE-KW disrupted the membranes of nuclear and chloroplast in ultrastructural cell of SDEC-11, and reduced the room between chloroplast and cell membrane and increased the starch size of SDEC-13. This reduced algal growth and biocompound accumulation, but SDEC-13 had greater adaptation to ADE-KW than SDEC-11. Moreover, inoculation with an algal seed pretreated with GIB aided the adaptability and viability of algae in ADE-KW, which for SDEC-13 was even promoted to the level in BG11. GIB mitigated the inhibition of ADE-KW on algal cell division and photosynthetic pigments and apparatus, and increased lipid droplets, which might result from the change in the synthesis and the fate of nicotinamide adenine dinucleotide phosphate. GIB addition significantly promoted lipid productivity of the two algal species, following 13 mg L−1 d−1 of SDEC-11 in B+ADE-KW and especially 13 mg L−1 d−1 of SDEC-13 achieved during the priming of algal seed with the hormones, which is 139% higher than 5 mg L−1 d−1 achieved in ADE-KW control.ConclusionsAgricultural phytohormones could be applied as a strategy for promoting biomass and biocompound accumulation of algae in ADE-KW, in which pretreatment of the algal inoculum with hormones is a unique way to help algae survive under stress. Considering our results and treatment technology for kitchen waste, a more feasible and economic plant can be built incorporating anaerobic digestion, algae cultivation with ADE-KW assisted with phytohormones, and biodiesel production.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0759-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Toward facilitating microalgae cope with effluent from anaerobic digestion of kitchen waste: the art of agricultural phytohormones

Pei

Jiang

Hou

et al. 2017

Biotechnol Biofuels

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“…Waste management and energy recovery can be effectively combined in the anaerobic digestion process. Anaerobic digestion performed under controlled conditions also allows pollution reduction and emissions control, reducing greenhouse gas emissions compared to fossil fuels by the utilization of local resources [4]. Biogas is obtained from waste materials through the anaerobic digestion process.…”

Section: Introductionmentioning

confidence: 99%

Waste paper and macroalgae co-digestion effect on methane production

Rodríguez

Alaswad

El-Hassan

et al. 2018

Energy

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The present study investigates the effect on methane production from waste paper when co-digested with macroalgal biomass. Both feedstocks were previously mechanically pretreated to reduce their particle size. The study was planned according two factors: the feedstock to inoculum (F/I) ratio and the waste paper to macroalgae (WP/MA) ratio. The F/I ratios checked were 0.2, 0.3 and 0.4 and the WP/MA ratios were 0:100, 25:75, 50:50, 75:25 and 100:0. The highest methane yield (386 L kg-1 VS added) was achieved at an F/I ratio of 0.2 and a WP/MA ratio of 50:50. A biodegradability index of 0.87 obtained in this study indicates complete conversion of feedstock at an optimum C/N ratio of 26. Synergistic effect was found for WP/MA 25:75, 50:50 and 75:25 mixing ratios compared with the substrates mono-digestion.

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“…To do this, many principles for selecting a potential plant should be taken into consideration, such as growth rate, nutrient removal efficiency and tolerance to the toxic pollutants (23). There have been a substantial number of articles that reviewed the microalgae based biofuels and various associated bioreactors (7,30,31). In contrast, the potential of microalgal cultivations for both energy production and environmental treatment together is rarely reviewed and is yet to be widely practiced in industry, even though industrial cultivation of microalgae have been employed in the production of selected products, such as pigments like astaxanthin or special lipids as omega 3 fatty acids (32).…”

Section: Introductionmentioning

confidence: 99%

Microalgae: a robust “green bio-bridge” between energy and environment

Chen

Vaidyanathan

2017

Critical Reviews in Biotechnology

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Microalgae are a potential candidate for biofuel production and environmental treatment because of their specific characteristics (e.g. fast growth, carbon neutral, and rich lipid accumulations). However, several primary bottlenecks still exist in current technologies, including low biomass conversion efficiency, bio-invasion from the external environment, limited or costly nutrient sources, and high energy and capital input for harvest, and stalling its industrial progression. Coupling biofuel production with environmental treatment renders microalgae a more feasible feedstock. This review focuses on microalgae biotechnologies for both bioenergy generation and environmental treatment (e.g. CO sequestration and wastewater reclamation). Different intelligent technologies have been developed, especially during the last decade, to eliminate the bottlenecks, including mixotrophic/heterotrophic cultivation, immobilization, and co-cultivation. It has been realized that any single purpose for the cultivation of microalgae is not an economically feasible option. Combinations of applications in biorefineries are gradually reckoned to be necessary as it provides more economically feasible and environmentally sustainable operations. This presents microalgae as a special niche occupier linking the fields of energy and environmental sciences and technologies. The integrated application of microalgae is also proven by most of the life-cycle analysis studies. This study summarizes the latest development of primary microalgal biotechnologies in the two areas that will bring researchers a comprehensive view towards industrialization with an economic perspective.

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An overview of bio augmentation of methane by anaerobic co-digestion of municipal sludge along with microalgae and waste paper

Cited by 52 publications

References 35 publications

Toward facilitating microalgae cope with effluent from anaerobic digestion of kitchen waste: the art of agricultural phytohormones

Toward facilitating microalgae cope with effluent from anaerobic digestion of kitchen waste: the art of agricultural phytohormones

Waste paper and macroalgae co-digestion effect on methane production

Microalgae: a robust “green bio-bridge” between energy and environment

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