Engineered algal biochar for contaminant remediation and electrochemical applications

Singh, Asha; Sharma, Rozi; Pant, Deepak; Malaviya, Piyush

doi:10.1016/j.scitotenv.2021.145676

Cited by 124 publications

(36 citation statements)

References 290 publications

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“…In aquaculture scenarios (coastal and open ocean), all "carbon costs" in a balance sheet must be accounted for, such as those for fabricating, deploying, and maintaining infrastructure needed to grow seaweeds, in the nearshore or open ocean, and using automated machinery and vessels to harvest seaweeds (Visser and Obi 2020). Seaweed ASSESSING SEAWEED CARBON SEQUESTRATION biomass may be used for various products that have been considered as carbon off-sets such as biochar (e.g., Gao and McKinley 1994, Bird et al 2010, Hughes et al 2012, Duarte et al 2013, Singh et al 2021 and the carbon costs of processing and transport also need to be accounted. In cases where seaweeds are harvested for human food or animal feed, the seaweed carbon is transformed into another form and this is does not equate to sequestration since both human and animal carbon cycles ultimately return seaweed carbon to the atmosphere as a mix of gases including CO 2 and methane (CH 4 ) which must be accounted for, particularly as CH 4 is a much more potent greenhouse gas than CO 2 (C2ES).…”

Section: Forensic Carbon Accountingmentioning

confidence: 99%

“…2013, Singh et al. 2021) and the carbon costs of processing and transport also need to be accounted. In cases where seaweeds are harvested for human food or animal feed, the seaweed carbon is transformed into another form and this is does not equate to sequestration since both human and animal carbon cycles ultimately return seaweed carbon to the atmosphere as a mix of gases including CO 2 and methane (CH 4 ) which must be accounted for, particularly as CH 4 is a much more potent greenhouse gas than CO 2 (C2ES).…”

Section: Forensic Carbon Accountingmentioning

confidence: 99%

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Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration

Hurd

Law

Bach

et al. 2022

Journal of Phycology

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Carbon sequestration is defined as the secure storage of carbon‐containing molecules for >100 years, and in the context of carbon dioxide removal for climate mitigation, the origin of this CO2 is from the atmosphere. On land, trees globally sequester substantial amounts of carbon in woody biomass, and an analogous role for seaweeds in ocean carbon sequestration has been suggested. The purposeful expansion of natural seaweed beds and aquaculture systems, including into the open ocean (ocean afforestation), has been proposed as a method of increasing carbon sequestration and use in carbon trading and offset schemes. However, to verify whether CO2 fixed by seaweeds through photosynthesis leads to carbon sequestration is extremely complex in the marine environment compared to terrestrial systems, because of the need to jointly consider: the comparatively rapid turnover of seaweed biomass, tracing the fate of carbon via particulate and dissolved organic carbon pathways in dynamic coastal waters, and the key role of atmosphere–ocean CO2 exchange. We propose a Forensic Carbon Accounting approach, in which a thorough analysis of carbon flows between the atmosphere and ocean, and into and out of seaweeds would be undertaken, for assessing the magnitude of CO2 removal and robust attribution of carbon sequestration to seaweeds.

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Section: Forensic Carbon Accountingmentioning

confidence: 99%

Section: Forensic Carbon Accountingmentioning

confidence: 99%

Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration

Hurd

Law

Bach

et al. 2022

Journal of Phycology

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“…The production of BC is also a sustainable solution for waste management [136,137] since it sequesters CO 2 [138], reintroduces important elements into the environment [139,140], replaces highly polluting materials and allows contributing to the circular economy [141][142][143]. Recently, the application of BC as an adsorbent media has been suggested for the removal of several contaminants [144,145], both inorganic (metals, salts) and organic (insecticides, herbicides, antibiotics) [146][147][148], also including the emerging ones [149].…”

Section: Biocharmentioning

confidence: 99%

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

et al. 2021

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Carbamazepine (CBZ), one of the most used pharmaceuticals worldwide and a Contaminant of Emerging Concern, represents a potential risk for the environment and human health. Wastewater treatment plants (WWTPs) are a significant source of CBZ to the environment, polluting the whole water cycle. In this review, the CBZ presence and fate in the urban water cycle are addressed, with a focus on adsorption as a possible solution for its removal. Specifically, the scientific literature on CBZ removal by activated carbon and its possible substitute Biochar, is comprehensively scanned and summed up, in view of increasing the circularity in water treatments. CBZ adsorption onto activated carbon and biochar is analyzed considering several aspects, such as physicochemical characteristics of the adsorbents, operational conditions of the adsorption processes and adsorption kinetics and isotherms models. WWTPs usually show almost no removal of CBZ (even negative), whereas removal is witnessed in drinking water treatment plants through advanced treatments (even >90%). Among these, adsorption is considered one of the preferable methods, being economical and easier to operate. Adsorption capacity of CBZ is influenced by the characteristics of the adsorbent precursors, pyrolysis temperature and modification or activation processes. Among operational conditions, pH shows low influence on the process, as CBZ has no charge in most pH ranges. Differently, increasing temperature and rotational speed favor the adsorption of CBZ. The presence of other micro-contaminants and organic matter decreases the CBZ adsorption due to competition effects. These results, however, concern mainly laboratory-scale studies, hence, full-scale investigations are recommended to take into account the complexity of the real conditions.

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“…Owing to these bottlenecks, researchers are directing efforts towards the development of low-cost and ecofriendly green technologies for the remediation of heavy metals and radioactive compounds from wastewater [16]. In this veneration, photosynthetic aquatic macrophytes have emerged as promising biosorbents and hyperaccumulators of these pollutants [17]. The photosynthetic aquatic macro-and microorganisms like plants and weeds, microphytes algae, and cyanobacteria can successfully remove more than 90% of toxic compounds due to their higher resistivity and tolerance toward the toxicity of heavy metals, radioisotopes, formaldehydes, phenols, and oxalic acids even at higher concentrations [18].…”

Section: Introductionmentioning

confidence: 99%

Efficacious bioremediation of heavy metals and radionuclides from wastewater employing aquatic macro‐ and microphytes

Das

Ghangrekar

2022

J Basic Microbiol

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Cytotoxic, mutagenic, and carcinogenic contaminants, such as heavy metals and radionuclides, have become an alarming environmental concern globally, especially for developed and developing nations. Moreover, inefficient prevalent wastewater treatment technologies combined with increased industrial activity and modernization has led to increase in the concentration of toxic metals and radioactive components in the natural water bodies. However, for the improvement of ecosystem of rivers, lakes, and other water sources different physicochemical methods such as membrane filtration, reverse osmosis, activated carbon adsorption, electrocoagulation, and other electrochemical treatment are employed, which are uneconomical and insufficient for the complete abatement of these emerging pollutants. Therefore, the application of bioremediation employing aquatic macrophytes and microphytes have gained considerable importance owing to the benefits of cost-effectiveness, eco-friendly, and higher energy efficiency. Thus, the present review aims to enlighten the readers on the potential application of algae, cyanobacteria, plant, and other aquatic micro-and macrophytes for the elimination of carcinogenic metals and radioactive isotopes from wastewater. Additionally, the use of transgenic plants, genetically modified species, algal-bacterial symbiosis for the enhancement of removal efficiency of mutagenic contaminants are also highlighted. Furthermore, species selection based on robustness, mechanism of different pathways for heavy metal and radionuclide detoxification are elucidated in this review article.

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Engineered algal biochar for contaminant remediation and electrochemical applications

Cited by 124 publications

References 290 publications

Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration

Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

Efficacious bioremediation of heavy metals and radionuclides from wastewater employing aquatic macro‐ and microphytes

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