Simultaneously upgrading biogas and purifying biogas slurry using cocultivation of Chlorella vulgaris and three different fungi under various mixed light wavelength and photoperiods

Cao, Weixing; Wang, Xue; Sun, Shiqing; Zhao, Yongjun; Zhao, Yongjun

doi:10.1016/j.biortech.2017.05.194

Cited by 85 publications

(28 citation statements)

References 37 publications

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“…In addition, culturing certain species of microalgae with sanitary sewage might enable the harvest of potentially high added value microalgae biomass and the metabolic products, such as proteins and fatty acids 10 , 11 . Therefore, microalgae-based technology is suitable for wastewater treatment because of its high effectiveness and low-cost 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Wang²,

Sun

et al. 2017

Sci Rep

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Three different treatment technologies, namely mono-algae culture, algal-bacterial culture, and algal-fungal culture, were applied to remove pollutants form synthetic domestic sewage and to remove CO2 from biogas in a photobioreactor. The effects of different initial influent C/N ratios on microalgal growth rates and pollutants removal efficiencies by the three microalgal cultures were investigated. The best biogas upgrading and synthetic domestic sewage pollutants removal effect was achieved in the algal-fungal system at the influent C/N ratio of 5:1. At the influent C/N ratio of 5:1, the algal-fungal system achieved the highest mean chemical oxygen demand (COD) removal efficiency of 81.92% and total phosphorus (TP) removal efficiency of 81.52%, respectively, while the algal-bacterial system demonstrated the highest mean total nitrogen (TN) removal efficiency of 82.28%. The average CH4 concentration in upgraded biogas and the removal efficiencies of COD, TN, and TP were 93.25 ± 3.84% (v/v), 80.23 ± 3.92%, 75.85 ± 6.61%, and 78.41 ± 3.98%, respectively. These results will provide a reference for wastewater purification ad biogas upgrading with microalgae based technology.

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Section: Introductionmentioning

confidence: 99%

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Wang²,

Sun

et al. 2017

Sci Rep

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“…A 16.8‐L glass jar was used as a photobioreactor, and the set‐up diagram was as shown in Figure (Cao et al, ). The photobioreactor (height = 0.6 m; diameter = 0.2 m) was filled with 2.8 L of PWW and 14 L of biogas.…”

Section: Methodsmentioning

confidence: 99%

“…The zinc ion removal efficiency (%) was calculated by the difference in zinc ion concentration in the pig wastewater before and after treatment. The growth rate (d −1 ) and biomass productivity (g L −1 d −1 ) of the microalgae, removal efficiency of nutrient in PWW, and CO 2 in biogas were calculated according to the equations in the references (Cao et al, ; Zhao et al, ). The economic efficiency of the energy consumption for nutrients and CO 2 removal in biogas slurry and biogas are calculated by Equation ().

E = \frac{R}{italickTP}

where E is the economic efficiency of the energy consumption for nutrient and CO 2 removal, USD −1 ; R is the removal efficiency, %; k is the electric power charge per unit of energy consumption, USD kW −1 h −1 ; T is the illumination time, h; P is the LED electrical power consumption, W. The electric power charge per unit of energy consumption k in local after conversion is around 0.08826 USD kW −1 h −1 (Cao et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…Up to now, most researches merely focused on wastewater purification and biogas upgrading by mono‐microalgae cultivation or co‐cultivation of fungi and microalgae under different light conditions (Cao, Wang, Sun, Hu, & Zhao, ; Sun et al, ; Yang et al, ; Zhou, Zhang, & Jia, ). However, the effect of the microalgae–fungi/bacteria symbiosis system on biogas upgrading and pollutant purification in PWW as well as the heavy metals removal under different initial microalgae inoculation conditions has not been reported.…”

Section: Introductionmentioning

confidence: 99%

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Nutrient and heavy metal removal from piggery wastewater and CH₄ enrichment in biogas based on microalgae cultivation technology under different initial inoculum concentration

Guo

Guan

Sun

et al. 2019

Water Environment Research

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Three microalgae-based treatment technologies were applied for removing nutrients in piggery wastewater and CO 2 in biogas simultaneously. Chlorella vulgaris (C. vulgaris), Scenedesmus obliquus (S. obliquus), and Neochloris oleoabundans (N. oleoabundans) were selected for mono-cultivation or co-cultivation with fungi or activated sludge. The effects of initial inoculum concentration (low of 62.06 ± 6.23 mg/L, medium of 121 ± 9.34 mg/L, and high of 180 ± 12.78 mg/L) of microalgae/algal symbiont on the pollutant removal efficiency were evaluated. The results showed that cultivation of S. obliquus with activated sludge had a relatively high CO 2 and nutrients removal efficiency at a medium concentration of initial inoculum. The highest removal efficiency of total organic carbon, total nitrogen, and total phosphorus in piggery wastewater was 87.29%, 87.26%, and 90.17% by co-cultivation of S. obliquus with activated sludge. The highest CO 2 removal of 64.28% could be achieved under co-cultivation of S. obliquus and fungi at medium initial inoculum concentrations. This work will be helpful to promote the study of microalgae-based biogas upgrading and piggery wastewater purification. © 2019 Water Environment Federation • Practitioner points• Nutrient and CO 2 were efficiently removed in moderate microalgal initial inoculum. • Scenedesmus obliquus-activated sludge cultivation achieved the highest nutrient removal. • Co-cultivation of S. obliquus and fungi showed the highest CO 2 removal. • Zinc was removed efficiently in high microalgal initial inoculum. • Chlorella vulgaris/S. obliquus-activated sludge performed economically.

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“…The key obstacle for high AD implementation of raw biogas is the upgrade into bio-methane, where the removal of This study proposes electric potential swing desorption (EPSD) as a step towards affordable bio-gas upgrading (Lijó et al, 2017;Parkin, 2016;Pascal et al, 2015;Roy et al, 2015). Bio-methane is typically 86-96% CH 4 and 2-6% CO 2 with H 2 S < 10ppm and can be used in vehicles or injected in national natural gas grids (Cao et al, 2017;Farooq et al, 2016;Kanjanarong et al, 2017). The necessity to reduce the H 2 S concentration to be in compliance with grid injection standards is a challenge.…”

Section: Introductionmentioning

confidence: 99%

In-situ regeneration of activated carbon with electric potential swing desorption (EPSD) for the H2S removal from biogas

Farooq

Almustapha

Imran

et al. 2018

Bioresource Technology

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In-situ regeneration of a granular activated carbon was conducted for the first time using electric potential swing desorption (EPSD) with potentials up to 30 V. The EPSD system was compared against a standard non-potential system using a fixed-bed reactor with a bed of 10 g of activated carbon treating a gas mixture with 10,000 ppm HS. Breakthrough times, adsorption desorption volume, capacities, effect of regeneration and desorption kinetics were investigated. The analysis showed that desorption of HS using the new EPSD system was 3 times quicker compared with the no potential system. Hence, physical adsorption using EPSD over activated carbon is efficient, safe and environmental friendly and could be used for the in-situ regeneration of granular activated carbon without using a PSA and/or TSA system. Additionally, adsorption and desorption cycles can be obtained with a classical two column system, which could lead towards a more efficient and economic biogas to biomethane process.

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Simultaneously upgrading biogas and purifying biogas slurry using cocultivation of Chlorella vulgaris and three different fungi under various mixed light wavelength and photoperiods

Cited by 85 publications

References 37 publications

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Nutrient and heavy metal removal from piggery wastewater and CH₄ enrichment in biogas based on microalgae cultivation technology under different initial inoculum concentration

In-situ regeneration of activated carbon with electric potential swing desorption (EPSD) for the H2S removal from biogas

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Simultaneously upgrading biogas and purifying biogas slurry using cocultivation of Chlorella vulgaris and three different fungi under various mixed light wavelength and photoperiods

Cited by 85 publications

References 37 publications

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Nutrient and heavy metal removal from piggery wastewater and CH4 enrichment in biogas based on microalgae cultivation technology under different initial inoculum concentration

In-situ regeneration of activated carbon with electric potential swing desorption (EPSD) for the H2S removal from biogas

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Nutrient and heavy metal removal from piggery wastewater and CH₄ enrichment in biogas based on microalgae cultivation technology under different initial inoculum concentration