Sustainable treatment of dye wastewater by recycling microalgal and diatom biogenic materials: Biorefinery perspectives

• Published in: Chemosphere (Oxford) 2022-10, Vol.305, p.135371-135371, Article 135371
• Main Authors: Rai, Anshuman, Sirotiya, Vandana, Mourya, Megha, Khan, Mohd Jahir, Ahirwar, Ankesh, Sharma, Anil K., Kawatra, Rajeev, Marchand, Justine, Schoefs, Benoit, Varjani, Sunita, Vinayak, Vandana
• Format: Article
• Language: English
• Subjects: Biomass; Chlorella; Coloring Agents; Diatoms; Dyes; Environmental Sciences; Microalgae; Nanoparticles; Textile effluent; Wastewater
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.135371

Discharge of untreated or partially treated toxic dyes containing wastewater from textile industries into water streams is hazardous for environment. The use of heavy metal(s) rich dyes, which are chemically active in azo and sulfur content(s) has been tremendously increasing in last two decades. Conventional physical and chemical treatment processes help to eliminate the dyes from textile wastewater but generates the secondary pollutants which create an additional environmental problem. Microalgae especially the diatoms are promising candidate for dye remediation from textile wastewater. Nanoporous diatoms frustules doped with nanocomposites increase the wastewater remediation efficiency due to their adsorption properties. On the other hand, microalgae with photosynthetic microbial fuel cell have shown significant results in being efficient, cost effective and suitable for large scale phycoremediation. This integrated system has also capability to enhance lipid and carotenoids biosynthesis in microalgae while simultaneously generating the bioelectricity. The present review highlights the textile industry wastewater treatment by live and dead diatoms as well as microalgae such as Chlorella, Scenedesmus, Desmodesmus sp. etc. This review engrosses applicability of diatoms and microalgae as an alternative way of conventional dye removal techniques with techno-economic aspects. [Display omitted] •Textile wastewater are rich in dyes and need an economic action.•Microalgae are economic source of remediating industrial pollutants.•Biorefinery aspects of microalgae-based effluents remediation have been uncovered.•The diatom cell wall has high surface area and good adsorption rate.•Diatoms in microbial fuel cell generate bioelectricity and valuable components.