Boosting the biological recovery of elemental sulfur from flue gases through multi-enzymatic systems
MoRE2020 Fellow Mukesh Kumar Awasthi, incoming mobility from Northwest A&F University, China, to the University of Borås
The aim of this project is the development of a multi-step biological process boosted by enzymatically enriched reactors able to recover elemental sulfur from flue gases. Robust and economical, biological treatment has attracted large interest as a process for treating wastewater and waste gases. A substantial amount of research efforts have been devoted to this topic in recent years since bioreactors offer a cost-effective and environmental friendly alternative to conventional control technologies. In addition, resource recovery has recently become a must for consolidating environmental technologies in the market. We aim at the removal of SO2 contained in combustion off gases as well as sulfate-rich waste waters by means of a combination of biological reactors enriched with thermotolerant enzymes that allow recovering elemental sulfur, a marketable product, with large efficiencies. A three step biological process, namely thermotolerant adsorption mechanism(TAM); 1) absorbing SO2 in a thermotolerant biotrickling filter (TBTF), 2) reducing the absorbed sulfate to sulfide in a anaerobic thermotolerat granular sludge blanket (ATGSB) bioreactor and 3) oxidizing sulfide to elemental sulfur in a micro-aerated continuous stirred tank reactor (MACSTR). The MoRE proposal scope is to use the ‘Multi-Enzyme Engineered Bioreactor’ (MEEB) concept for overcoming process bottlenecks and improving bioreactors performance through the use of thermotolerant multienzyme consortia (TMEC) and cross-linked enzyme aggregates (CLEAs). During this one-year MoRE project a comprehensive study of long-term SO2 and sulfide removal in TBTF, ATGSB and MACSTR, respectively, combined with MEEBs will be analyzed under both steady-state and transient conditions to develop the novel TAM+MEEBs process concept that will boost the TAM process performance.
Collaborating end-user: Borås Energi och Miljö AB