Removal of hydrogen sulfide generated during anaerobic treatment of sulfate-laden wastewater using biochar: Evaluation of efficiency and mechanisms.
Removal of hydrogen sulfide (H2S) from biogas was investigated in a biochar column integrated with a bench-scale continuous-stirred tank reactor (CSTR) treating sulfate-laden wastewater. Synthetic wastewater containing sulfate concentrations of 200-2000mg SO42-/L was used as substrate, and the CSTR was operated at an organic loading rate of 1.5g chemical oxygen demand (COD)/L·day and a hydraulic retention time (HRT) of 20days. The biochar was able to remove about 98.0 (±1.2)% of H2S for the ranges of concentrations from 105-1020ppmv, especially at high moisture content (80-85%). Very high H2S adsorption capacity (up to 273.2±1.9mg H2S/g) of biochar is expected to enhance the H2S oxidation into S0and sulfate. These findings bring a potentially novel application of sulfur-rich biochar as a source of sulfur, an essential but often deficient micro-nutrient in soils.
Department of Industrial Biotechnology, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Jarupat
J
Kanjanarong
Indian Institute of Technology (BHU), Varanasi 221005, India; Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, HI 96822, USA.
Balendu S
BS
Giri
Plant and Soil Sciences, University of Delaware, Newark, DE 19716, USA.
Deb P
DP
Jaisi
Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, HI 96822, USA.
Fernanda R
FR
Oliveira
Department of Industrial Biotechnology, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Piyarat
P
Boonsawang
Energy Technology Research Institute, Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Sumate
S
Chaiprapat
Indian Institute of Technology (BHU), Varanasi 221005, India.
R S
RS
Singh
Plant and Soil Sciences, University of Delaware, Newark, DE 19716, USA.
Avula
A
Balakrishna
Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, HI 96822, USA. Electronic address: khanal@hawaii.edu.
Samir Kumar
SK
Khanal
D019149:Bioreactors; D006862:Hydrogen Sulfide / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry; D013431:Sulfates; D014865:Waste Disposal, Fluid; D062065:Wastewater
D006862:Hydrogen Sulfide; D012722:Sewage; D013431:Sulfates; D062065:Wastewater
Anaerobic treatment; Biochar; Biogas cleaning; Hydrogen sulfide (H(2)S) removal; Micro-nutrient; Sulfate-laden waste streams