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 S0 and 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.
['Kanjanarong|Jarupat|J|', 'Giri|Balendu S|BS|', 'Jaisi|Deb P|DP|', 'Oliveira|Fernanda R|FR|', 'Boonsawang|Piyarat|P|', 'Chaiprapat|Sumate|S|', 'Singh|R S|RS|', 'Balakrishna|Avula|A|', 'Khanal|Samir Kumar|SK|']
D019149:Bioreactors D006862:Hydrogen Sulfide D012722:Sewage D013431:Sulfates D014865:Waste Disposal, Fluid D062065:Waste Water
Anaerobic treatment Biochar Micro-nutrient Biogas cleaning Hydrogen sulfide (H(2)S) removal Sulfate-laden waste streams