In a beamhouse,liming plays a key role in the removal of hair/wool and epidermis,but problems are created when waste liming sludge is discharged to the environment.The treatment of tannery wastewater is another major challenge to the industry.In this study,thermally-activated biochars derived from liming sludge were studied for their effective adsorption of chromium(Cr)from the tannery wastewater.The thermally activated biochars(B500,B550,B600,and B650)were prepared at different temperatures from the liming sludge.Their characteristics before and after the treatment were investigated using Fourier transform infrared spectroscopy,energy dispersive X-ray spectroscopy,Bru-nauer-Emmett-Teller,and scanning electron microscopy analyses.The related functional groups(C-H,O-H,C-N,and=C-O)and chromium adsorption capacity were determined according to the surface morphology,element contents(C,O,Ca,Na,Al,Mg,and Si),surface area(5.8-9.2 m2/g),pore size(5.22-5.53 nm),and particle size(652-1 034 nm)of the experimental biochars.The biochar originated at 600° C from the tannery liming sludge(B600)had a greater surface area with a chromium adsorption capacity of 99.8％in comparison to B500,B550,and B650 biochars.This study developed an innovative way of utilizing liming sludge waste to minimize the pollution load and wastewater treatment cost in the tannery industry.

Abul Hashem;Sofia Payel;Sadia Mim;Anik Hasan;Shahruk Nur-A-Tomal;Aminur Rahman;Majher I.Sarker

Department of Leather Engineering,Khulna University of Engineering&Technology(KUET),Khulna 9203,Bangladesh;Department of Public Health Engineering(DPHE),Zonal Laboratory,Jashore 7400,Bangladesh;Global Centre for Environmental Remediation(GCER),College of Engineering,Science and Environment,The University of Newcastle,Callaghan,NSW 2308,Australia;Sustainable Biofuels and Co-Products Research Unit,Eastern Regional Research Center,Agricultural Research Service,U.S.Department of Agriculture,Wyndmoor,PA 19038,USA

水科学与水工程

[1]Abul Hashem;Sofia Payel;Sadia Mim;Anik Hasan;Shahruk Nur-A-Tomal;Aminur Rahman;Majher I.Sarker-.Chromium adsorption on surface activated biochar made from tannery liming sludge:A waste-to-wealth approach)[J].水科学与水工程,2022(04):328-336

tannery,liming,beamhouse,B500,B550,B600,B650

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