In-situ prevention of hydrogen sulfide formation during anaerobic digestion using zinc oxide nanowires
| Autor: | Jagannadh Satyavolu, Dania Alvarez-Fonseca, Zachary D. Herde, Robert Lupitskyy |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Sulfide Chemistry Process Chemistry and Technology Hydrogen sulfide 0208 environmental biotechnology Inorganic chemistry chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences 01 natural sciences Pollution Sulfur Zinc sulfide Sodium sulfide 020801 environmental engineering Anaerobic digestion chemistry.chemical_compound Biogas Chemical Engineering (miscellaneous) Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Journal of Environmental Chemical Engineering. 6:110-118 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2017.11.048 |
| Popis: | The utilization of Anaerobic Digestion (AD) technology for biogas and energy generation is often hindered by high concentration of sulfur-containing compounds in wastewater and consequential hydrogen sulfide (H2S) in biogas. In this work, we demonstrated a process, where independent mechanisms of anaerobic microorganisms and an inorganic reactive adsorbent (zinc oxide nanowires) worked synergistically to remove soluble sulfide (HS−) and prevent H2S formation during AD. Using a model aqueous sodium sulfide (Na2S) system, the nanowires (dosage 1 g/L) effectively removed sulfides from the Na2S solution to a maximum of 625 mg S2−/L per gram of ZnO. During 24 h and 3-day long (involving three consecutive sulfate feeding cycles) AD studies using anaerobic microbial medium (2 g/L SO42− and 1 g/L ZnO), no decrease in methanogenic activity and biogas production were observed using the ZnO nanowires, indicating that the nanowires can reduce the sulfide toxicity during AD. The post-process analysis of the recovered nanomaterial using energy-dispersive X-ray spectroscopy and X-ray diffraction showed the presence of sulfur and zinc sulfide (ZnS), respectively, validating HS− removal by the nanowires. This process intensification approach of combining AD and H2S removal into a single process step will help extend AD technology to high sulfate containing wastewaters. |
| Databáze: | OpenAIRE |
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