Potential of wastewater treating Chlorella minutissima for methane enrichment and CO2 sequestration of biogas and producing lipids

Khan, Shumaila; Malla, Fayaz A.; Rashmi, Rashmi; Malav, Lal Chand; Gupta, Nikesh; Kumar, Amit

doi:10.1016/j.energy.2018.02.126

Cited by 34 publications

(9 citation statements)

References 33 publications

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“…The processes were also reported to generate microalgal biomass of above 2.98-4.40 gL -1 with a lipid content of greater than 34% and consisting of long-chain fatty acids (Srinuanpan et al, 2019(Srinuanpan et al, , 2018. Similarly, Khan et al (2018) found a CH 4 content improvement of 81.6%, with a high-quality lipid accumulation of 26% based on microalgal dry mass. In particular, microalgal co-cultivation with bacteria or fungi has A proven greater energy and CO 2 removal efficiency (Zhang et al, 2020).…”

Section: Utilization Of Microalgae Oil For Biogas Upgrading and Simultaneously Producing Oilmentioning

confidence: 95%

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

et al. 2021

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Third-generation biofuel produced from microalgae is a viable solution to global energy insecurity and climate change. Despite an annual current global algal biomass production of 38 million litres, commercialization confronts significant economic challenges. However, cost minimization strategies, particularly for microalgae cultivation, have largely been excluded from recent studies. Therefore, this review provides essential insights into the technologies and economics of cost minimization strategies for large-scale applications. Cultivation of microalgae through aquafarming, in wastewater, or for biogas upgrading, and co-production of value-added products (VAPs) such as photo-bioreactors, protein, astaxanthin, and exopolysaccharides can drastically reduce biodiesel production costs. For instance, the co-production of photo-bioreactors and astaxanthin can reduce the cost of biodiesel production from $3.90 to $0.54 per litre. Though many technical challenges need to be addressed, the economic analysis reveals that incorporating such cost-effective strategies can make the biorefinery concept feasible and profitable. The cost of producing microalgal biodiesel can be lowered to $0.73kg−1 dry weight when cultivated in wastewater or $0.54L−1 when co-produced with VAPs. Most importantly, access to co-product markets with higher VAPs needs to be encouraged as the global market for microalgae-based VAPs is estimated to rise to $53.43 billion in 2026. Therefore, policies that incentivize research and development, as well as the production and consumption of microalgae-based biodiesel, are important to reduce the large gap in production cost that persists between biodiesel and petroleum diesel.

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Section: Utilization Of Microalgae Oil For Biogas Upgrading and Simultaneously Producing Oilmentioning

confidence: 95%

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

et al. 2021

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“…Apart from the key bioactive compounds microalgae biomass contains high NPK content making it suitable as organic manure or biofertilizer with a potential to replace the current chemical fertilizers. Recently, Khan and co-authors have studied biofertilizer potential of Chlorella minutissima and concluded to contain 1.15% P, 5.87% N and 0.28% K which is better than available organic fertilizers (Khan et al 2018). Moreover, application of algal biomass as manure to soils would not result in volatilization of nitrogen as ammonium or loss due to leaching, as only 5% of algal nitrogen is available as mineral N (Khan et al 2018).…”

Section: Other Productsmentioning

confidence: 99%

“…Recently, Khan and co-authors have studied biofertilizer potential of Chlorella minutissima and concluded to contain 1.15% P, 5.87% N and 0.28% K which is better than available organic fertilizers (Khan et al 2018). Moreover, application of algal biomass as manure to soils would not result in volatilization of nitrogen as ammonium or loss due to leaching, as only 5% of algal nitrogen is available as mineral N (Khan et al 2018). Other key products that has been explored by various authors are bioethanol, biohydrogen, DHA which has been detailed in Table 3.…”

Section: Other Productsmentioning

confidence: 99%

Valorization of microalgae biomass into bioproducts promoting circular bioeconomy: a holistic approach of bioremediation and biorefinery

et al. 2021

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The need for alternative source of fuel has demanded the cultivation of 3rd generation feedstock which includes microalgae, seaweed and cyanobacteria. These phototrophic organisms are unique in a sense that they utilise natural sources like sunlight, water and CO 2 for their growth and metabolism thereby producing diverse products that can be processed to produce biofuel, biochemical, nutraceuticals, feed, biofertilizer and other value added products. But due to low biomass productivity and high harvesting cost, microalgae-based production have not received much attention. Therefore, this review provides the state of the art of the microalgae based biorefinery approach to define an economical and sustainable process. The three major segments that need to be considered for economic microalgae biorefinery is low cost nutrient source, efficient harvesting methods and production of by-products with high market value. This review has outlined the use of various wastewater as nutrient source for simultaneous biomass production and bioremediation. Further, it has highlighted the common harvesting methods used for microalgae and also described various products from both raw biomass and delipidified microalgae residues in order to establish a sustainable, economical microalgae biorefinery with a touch of circular bioeconomy. This review has also discussed various challenges to be considered followed by a techno-economic analysis of the microalgae based biorefinery model.

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“…2 However, the effluent biogas slurry (BS) produced after anaerobic fermentation still contains a high concentration of inorganic nitrogen, which needs further treatment before returning to the field or being discharged into natural water. 3 treatments are commonly applied to remove nitrogen from the BS, which contains high concentrations of ammonia nitrogen, organic carbon, and complex organic matter including recalcitrant cellulose. A low C/N ratio of wastewater (representing an insufficient carbon source) and a low concentration of organics (representing a deficiency in nutrients and electron requirements) results in an incomplete denitrification reaction.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Low C/N Ratio Wastewater by a Carbon Cloth Bipolar Plate Multicompartment Electroenhanced Bioreactor (CBM-EEB)

Liu

Zhu

2020

ACS Omega

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The traditional biological denitrification process has the problems of low removal rates and lack of a carbon source when treating wastewater with high ammonia nitrogen concentration and a low carbon–nitrogen ratio. Based on a bio-electrochemical system (BES), a novel carbon cloth bipolar plate multicompartment electroenhanced bioreactor (CBM-EEB) system was constructed. In this study, nitrogen removal efficiency and enrichment of functional bacteria using CBM-EEB under different voltage conditions were investigated. The results from next-generation sequencing indicated that the CBM-EEB included heterotrophic nitrification and aerobic denitrification (HNAD) and was dominated by heterotrophic nitrification aerobic denitrifying bacteria (HNADB). The applied voltage was confirmed as having the ability to regulate the microbial community structure and abundance of functional genes, thereby further enhancing the nitrogen removal efficiency of the system. The total nitrogen removal efficiency was 77.70 ± 1.14, 87.10 ± 0.56, 86.40 ± 0.59, and 89.30 ± 0.53% under applied voltages of 0.4, 0.7, 1.0, and 1.3 V, respectively. All values were significantly higher than the control group (62.86 ± 2.06%). HNADB had the highest abundance among the 17 detected genera related to nitrogen metabolism. Facultative denitrifying bacteria, Pseudoxanthomonas, along with key bacteria of HNADB, such as Flavobacterium, constructed a shortcut simultaneous nitrification–denitrification (SND) process. Poisson analysis and redundancy analysis (RDA) showed that the applied voltage improved the denitrification efficiency by changing the microbial community structure, reducing the abundance of heterotrophic bacteria, and increasing the unit abundance of key functional genes so that less organics were required for the denitrification process. The increased nitrogen removal efficiency in the experimental group was mainly related to simultaneous nitrification–denitrification process and cooperation of microbial communities in the anode and the cathode. This study highlighted the feasibility of CBM-EEB to enhance the HNAD reaction and the response of wastewater with a low C/N ratio to enhance the abundance of microbial bacteria and their functional gene abundance.

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Potential of wastewater treating Chlorella minutissima for methane enrichment and CO2 sequestration of biogas and producing lipids

Cited by 34 publications

References 33 publications

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

Strategies to Produce Cost-Effective Third-Generation Biofuel From Microalgae

Valorization of microalgae biomass into bioproducts promoting circular bioeconomy: a holistic approach of bioremediation and biorefinery

Treatment of Low C/N Ratio Wastewater by a Carbon Cloth Bipolar Plate Multicompartment Electroenhanced Bioreactor (CBM-EEB)

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