Removal of hydrogen sulfide generated during anaerobic treatment of sulfate-laden wastewater using biochar: Evaluation of efficiency and mechanisms. (June 2017)

• Record Type: Journal Article
• Authors: Kanjanarong, Jarupat; Giri, Balendu S.; Jaisi, Deb P.; Oliveira, Fernanda R.; Boonsawang, Piyarat; Chaiprapat, Sumate; Singh, R.S.; Balakrishna, Avula; Khanal, Samir Kumar
• Is Part Of: Bioresource technology. Volume 234(2017)
• Page Start: 115
• Page End: 121
• Publication Date: 2017-06
• Subjects: Biochar -- Hydrogen sulfide (H2S) removal -- Biogas cleaning -- Micro-nutrient -- Sulfate-laden waste streams -- Anaerobic treatment; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.03.009
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: High effectiveness of biochar for H2 S removal (98%) was achieved. Biochar after sulfide removal contained sulfate and sulfur on its surface and in pores, respectively. Sulfur/sulfate on biochar makes it lucrative for land application. Abstract: Removal of hydrogen sulfide (H2 S) 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 200–2000 mg SO 4 2 - / L was used as substrate, and the CSTR was operated at an organic loading rate of 1.5 g chemical oxygen demand (COD)/L·day and a hydraulic retention time (HRT) of 20 days. The biochar was able to remove about 98.0 (±1.2)% of H2 S for the ranges of concentrations from 105–1020 ppmv, especially at high moisture content (80–85%). Very high H2 S adsorption capacity (up to 273.2 ± 1.9 mg H2 S/g) of biochar is expected to enhance the H2 S oxidation into S 0 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.