Removal of sulphur black dye from its aqueous solution using alginate from <i>Sargassum sp</i>. (Brown algae) as a coagulant

Vijayaraghavan, G.; Shanthakumar, S.

doi:10.1002/ep.12144

Cited by 19 publications

(11 citation statements)

References 35 publications

(54 reference statements)

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“…Sodium and calcium alginate are the main known forms of alginic salts extracted from macroalgae, and the difference between these salts depends mainly on the nature of the reagent used during the extraction step. The adapted method to extract sodium alginate by several researchers is that developed by Calumpong et al [24] with some slight modifications [42,158]. In accordance with this procedure, 25 g of the dried algae is soaked in 800 mL of 2% (v/v) formaldehyde under steering at room temperature for 1 day to remove phenolic compounds and pigments.…”

Section: (A) Alginic Acid and Alginatesmentioning

confidence: 99%

Algal Biomass Valorization for the Removal of Heavy Metal Ions

Boukarma

Aziam

Abali

et al. 2021

Inorganic-Organic Composites for Water and Wastewater Treatment

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Pollution generated by wastewater containing inorganic pollutants, such as heavy metals, has always been considered a real problem for our planet. Therefore, the removal of these micropollutants from polluted water is a valuable intervention to preserve human health and the environment. Many conventional methods are used today to treat wastewater, such as membrane filtration, chemical precipitation, ion exchange, and adsorption by activated carbon, but the operating cost they generate has restricted their use. To overcome this limitation, scientists have focused for always on the application of marine resources to clean up the environment. The adsorption of heavy metals by biosorbents obtained from algae has been widely studied for wastewater treatment, as the exploitation of this biomass has the advantage of being a low cost, renewable and abundant biological raw material, and its use as a biosorbent is also a great alternative to activated carbon. The sorption capacity of the vegetable adsorbent is depending on chemical constitution of their cell wall and the presence of macromolecules with various functional groups that interact with metal ions. We review in this chapter, (1) the challenges associated with heavy metals, such as water pollution, hazardous effects, and their removal techniques including biosorption based on algae biopolymers, such as alginate and carrageenan, (2) the main chemical and structural compounds of macroalgae responsible for the metal ions removal, (3) current knowledge on the potential of macroalgae regarding their pharmacological applications and possible biosorbents prepared from them for the removal of metal ions from aqueous solutions.

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Section: (A) Alginic Acid and Alginatesmentioning

confidence: 99%

Algal Biomass Valorization for the Removal of Heavy Metal Ions

Boukarma

Aziam

Abali

et al. 2021

Inorganic-Organic Composites for Water and Wastewater Treatment

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show abstract

“…The mechanism of colour removal is achievable either by concentrating the colour into sludge, partial breakdown or complete breakdown of the colour molecule. Adsorptive treatment is the most frequently employed for the treatment of coloured effluents because of the availability of numerous materials (adsorbents) such as activated carbon, resins, agricultural wastes, microorganisms and biopolymers [1,6]. Adsorptive treatment is however limited in use due to high cost incurred in the purchase of sorbents and regeneration and safe disposal of sorbate-laden materials.…”

Section: Introductionmentioning

confidence: 99%

“…Focus is now on the use of coagulants-flocculants of natural origins. Natural coagulants referred to as biocoagulant are categorised as plant-, animal-or microorganism-based, and are characterised with non-toxic, biodegradable, cheap, ready availability and abundant, environmentally friendly, etc [6]. The use of natural polymers as biocoagulants presents the following advantages over the conventional synthetic ones: completely biodegradation of sludge generated and no toxicity to the environment, [14].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Chitosan as a Coagulant Aid to Alum Precipitation of Congo Red In Wastewater

Ajoke¹,

Mercy²,

Alhassan³

2021

AJC

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The use of chitosan prepared from prawn shells as coagulant aid for congo red (CR) dye removal from wastewater was investigated in this study. Characterisation of the prepared chitosan samples showed characteristics similar to commercially available ones. The coagulation – flocculation experiment was carried out using the jar test procedure. Both chitosan and alum were used separately for the dye precipitation and then combined together. The usage of alum alone showed no precipitating effect on the CR dye molecule, while chitosan was able to considerably reduce the concentration of the dye in solution. When chitosan was used as a coagulant aid in the alum precipitation, the amount (%) of dye removed increased greatly. Optimization of the process via study of effect of pH and flocculation time at optimum alum – chitosan combination indicated that pH 4-5 and settling time of 40 min were suitable conditions for maximum decolourisation of CR dye wastewater with about 98% efficiency. Moreover, study of settling characteristics of the sludge produced from the alum-chitosan synergy was better than that produced from either of them alone. Also, occurrence of redispersion and restabilization of the precipitate was not encountered.

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“…Textile effluent is typically a complex mixture of organic and inorganic matters with strong color, high COD, high salinity, high temperature, variable pH, and low BOD [29,30]. The direct discharge of textile wastewater into rivers and streams could cause severe environmental problems [31].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Energy-Positive Wastewater Treatment System Design of Different Industrial Wastewater Streams

Tang

2021

Preprint

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Activated sludge (AS) process has been used as the conventional industrial wastewater treatment process in the past decades. However, intensive aeration requirements made it impossible for WWTPs to be energy positive. In addition, there are few cases of research assessing the efficiency and economic feasibility of innovative technologies in treating industrial wastewater to achieve energy positive. This study tries to assess the effect of different kinds of industrial wastewater on treatment efficiency, unit energy, environmental sustainability, and unit cost of treatment systems using innovative technologies such as micro sieving, UASB, and PN/A. Our Excel model showed that micro-sieving could remove 32.50-39.72% of COD from industrial wastewater. UASB reactor could removes 15.8%-53.5%, 14.0%-49.0% and 22.9%-51.0% of COD from three different wastewater streams. Mean unit energy production by the innovative system could reach 1.80, 1.77, and 1.73 kWh/kg BODremoved, respectively. The average unit cost of three kinds of wastewater is 0.54, 0.57, and 1.12 $/kg CODremoved, respectively. Treating meat processing wastewater with innovative technologies is the economical treatment method. However, this method could not be considered as the sustainable design due to the high effluent COD concentration. The economic advantages and limitations of innovative technologies in treating industrial wastewater have been quantified by energy, cost and environmental indicators. These metrics provide valuable references for future sustainable design of industrial wastewater treatment systems.

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Removal of sulphur black dye from its aqueous solution using alginate from Sargassum sp. (Brown algae) as a coagulant

Cited by 19 publications

References 35 publications

Algal Biomass Valorization for the Removal of Heavy Metal Ions

Algal Biomass Valorization for the Removal of Heavy Metal Ions

Efficacy of Chitosan as a Coagulant Aid to Alum Precipitation of Congo Red In Wastewater

Assessment of Energy-Positive Wastewater Treatment System Design of Different Industrial Wastewater Streams

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