Use of natural bio-sorbent in removing dye, heavy metal and antibiotic-resistant bacteria from industrial wastewater

Abstract

In this study, we evaluated the ability of waste shell powder (WSP) and moringa seed powder (MSP) individually or in combination to eliminate dye, heavy metal and resistant bacteria from the industrial wastewater (IWW). The presence of dyes, heavy metals, approximately 7.0 log CFU/ml of aerobic bacteria and 3.0-4.0 log CFU/ml of other pathogens including Escherichia coli, Pseudomonas aeruginosa, Citrobacter freundii, Serratia liquefaciens and Bacillus cereus was evident in IWW of both tannery and textile industries. In addition, depending on the type of bacterial species each bacterium was resistant to as high as 50 ppm of multi-metal (Cr 6+ , Cd 2+ and Pb 2+ or its combination) and even multi-drug resistant (amoxicillin, ampicillin, cefixime, ceftazidime, and tazobactam). Combined use of MSP (0.8 gm/100 ml IWW) and WSP (0.2 gm/100 ml IWW) treatment was able to discolor the IWW within 4 h and took 24 h to eliminate heavy metals and pathogenic bacteria to non-detectable level from the IWW, simultaneously. On the other hand, individual use of MSP or WSP was not found effective enough to remove or eliminate dye, heavy metal and bacteria simultaneously from the IWW. Similar experimental results were observed in the challenge test with laboratory-prepared effluent water containing 35.0 ppm Remazol Brilliant Blue R dye and maximum 50 ppm Cr 6+ . Thus, the combination of these two bio-sorbents could be applicable in IWW treatment before being discharged into the environment.

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

“…The issue that needs to be developed here is that adsorbents are cheap, environmentally friendly, and easy to produce 8,9 . Recently, various techniques such as ion Exchange, 10 chemical precipitation, 11 filtration, 12 coagulation, 13 physical adsorption, 14 biological treatment, 15 and reverse osmosis 16 are presented by researchers for removing and recycling heavy metal ions from wastewater, dyes, and similar environments 17 . In these methods, the adsorption approach is one of the most efficient techniques for the removal of heavy metal ions from aqueous solutions 18,19 .…”

Adsorption Performance of Dyes Over Zeolite for Textile Wastewater Treatment

“…Various researchers have used natural or freely available absorbents for the removal of dyes from industrial wastewater such as waste shell, moringa seed [7], waste red mud [8], coal, clay, and peat [9]. However, zeolite is a crystalline aluminosilicate microporous material, with characteristics of high cation exchange capacity and surface area, creating a three-dimensional matrix with related pores [10], which make it more efficient than the natural absorbents with a dye removal efficiency up to 94 % from wastewater [9].…”

Biotreatment of Effluent from Cassava Processing Using Powdered Seeds of Moringa oleifera

“…Its properties have been studied extensively. Its role in wastewater treatment as a coagulant has been equated to that of commercial coagulants including those from calcium, aluminium and iron salts [14][15][16][17][18][19][20]. The observed sorbent and coagulant qualities of the seeds of M. oleifera have been linked to the soluble cationic proteins produced as by-products of the oil extraction process [21,22].…”