Enhancing microalgae cultivation in anaerobic digestate through nitrification

Praveen, Prashant; Guo, Yang; Kang, Hyuna; Lefebvre, Clement; Loh, Kai‐Chee

doi:10.1016/j.cej.2018.08.099

Cited by 106 publications

(35 citation statements)

References 35 publications

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“…10, since day 9, the water EC was consistently and significantly lower in the PACC relative to the AC and PC, and decreased from an initial value of 1.63 mS·cm −1 to 0.82 mS·cm −1 at the end of the culture period. The rapid removal of nutrients in the PACC is promising because 30 days and 40 days were required respectively for NH 4 -N to decrease from 137 mg·L −1 to 5 mg·L −1 and for phosphorus to decrease from 25 mg·L −1 to 5 mg·L −1 in an optimized microalgae-based membrane photobioreactor (MPBR) [37]. These results demonstrate that the PACC could be used in engineered wastewater treatment systems.…”

Section: Resultsmentioning

confidence: 83%

“…The inhibitory effects of NH 4 -N on microalgae have been widely reported in digestate treatment [36] where growth inhibition has been observed at NH 4 -N > 100 mg·L −1 due to the presence of free ammonia [37]. To alleviate ammonia toxicity, Praveen et al [37] developed a culture strategy where nitrification is applied as a pretreatment. Ammonia toxicity is closely related to the pH of the medium as free ammonia increases with pH.…”

Section: Resultsmentioning

confidence: 99%

“…The wastewater pH in the PACC was 0.15 and 2.68 units lower than in the AC on day 3 and day 15, respectively. The acidic pH could result in the hydrogenation and solubilization of ammonia [37], thus alleviating the ammonia toxicity for the microalgae in the PACC. Ammonia toxicity can also be alleviated through the uptake of NH 4 -N by plants.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Vetiver and Dictyosphaerium sp. co-culture for the removal of nutrients and ecological inactivation of pathogens in swine wastewater

Wang

Cheng

et al. 2019

Journal of Advanced Research

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Vetiver and Dictyosphaerium sp. co-culture for the removal of nutrients and ecological inactivation of pathogens in swine wastewater

Wang

Cheng

et al. 2019

Journal of Advanced Research

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“… 17 In this sense, previous researchers investigated the use of centrate diluted in synthetic medium, secondary/tertiary wastewater, or seawater, in order to mitigate NH 4 + -N inhibition, lower the turbidity and enhance N/P ratio. 18 − 20 …”

Section: Introductionmentioning

confidence: 99%

Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Arashiro

Ferrer

Pániker

et al. 2020

ACS Sustainable Chem. Eng.

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This study assessed the recovery of natural pigments (phycobiliproteins) and bioenergy (biogas) from microalgae grown in wastewater. A consortium of microalgae, mainly composed by Nostoc , Phormidium , and Geitlerinema , known to have high phycobiliproteins content, was grown in photobioreactors. The growth medium was composed by secondary effluent from a high rate algal pond (HRAP) along with the anaerobic digestion centrate, which aimed to enhance the N/P ratio, given the lack of nutrients in the secondary effluent. Additionally, the centrate is still a challenging anaerobic digestion residue since the high nitrogen concentrations have to be removed before disposal. Removal efficiencies up to 52% of COD, 86% of NH 4 + -N, and 100% of phosphorus were observed. The biomass composition was monitored over the experimental period in order to ensure stable cyanobacterial dominance in the mixed culture. Phycocyanin and phycoerythrin were extracted from harvested biomass, achieving maximum concentrations of 20.1 and 8.1 mg/g dry weight, respectively. The residual biomass from phycobiliproteins extraction was then used to produce biogas, with final methane yields ranging from 159 to 199 mL CH 4 /g VS. According to the results, by combining the extraction of pigments and the production of biogas from residual biomass, we would not only obtain high-value compounds, but also more energy (around 5–10% higher), as compared to the single recovery of biogas. The proposed process poses an example of resource recovery from biomass grown in wastewater, moving toward a circular bioeconomy.

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“…Because high ammonium concentration is a disadvantage in using digestate for the cultivation of microalgae, Praveen et al (2018) proposed the pretreatment of digestate through nitrification. Svehla et al (2017) also attempted nitrification of digestate for soil use to minimize the ammonium losses during the application process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Digestate from Methane Fermentation using <i>Ulva</i> sp. and Food Waste for Cultivation of Decolored <i>Pyropia yezoensis</i> (Edible Laver Seaweed)

Kuroda

Nishikawa

2020

EUROPEAN J SUSTAINAB DEV

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Ulva sp. (green seaweed) often proliferates explosively and piles up in shallows. This phenomenon is called "green tide," caused by increased nutrient flow into an enclosed sea area. Although green tide is one of the environmental problems in coastal areas, Ulva sp. can be regarded as carbon-neutral and therefore can serve as an abundant feedstock for renewable energy. Methane fermentation is one of the suitable techniques for converting such seaweed into energy. Digestate from methane fermentation is normally used as fertilizer; however, it is ends up being treated as wastewater due to limited spaces in urban areas. This paper proposes that the digestate from methane fermentation using mixed biomass (Ulva sp. and food waste) can be applied to the cultivation of Pyropia yezoensis (edible laver seaweed, nori in Japanese), which has recently suffered from decolored phenomena because of decreasing nutrients. The absorption of nutrients and the color recovery of nori were investigated in laboratory-scale experiments based on comparison with artificial seawater. The results highlight that the significant absorption of nutrients and color recovery occurred because of digestate utilization, indicating its positive effects on decolored nori. In addition, the experiments found that not only NH4-N, but also other substances such as trace metal related to Ulva sp. can influence such effects. The findings clearly indicate that digestate can be used in the sea and that the suggested multiple uses of digestate would increase the value of digestate.

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Enhancing microalgae cultivation in anaerobic digestate through nitrification

Cited by 106 publications

References 35 publications

Vetiver and Dictyosphaerium sp. co-culture for the removal of nutrients and ecological inactivation of pathogens in swine wastewater

Vetiver and Dictyosphaerium sp. co-culture for the removal of nutrients and ecological inactivation of pathogens in swine wastewater

Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Effect of Digestate from Methane Fermentation using <i>Ulva</i> sp. and Food Waste for Cultivation of Decolored <i>Pyropia yezoensis</i> (Edible Laver Seaweed)

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