Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2020 Aug;310:123404. doi: 10.1016/j.biortech.2020.123404. Epub 2020 Apr 18.
Cobalt(II)-histidine [Co(II)His] is potentially a better alternative to ferrous complexes in the chemical absorption-biological reduction (CABR) flue gas denitrification process in view of its higher oxygenation reversibility. Though with excellent O-resistant ability, Co(II)His was still gradually oxidized into Co(III)His, losing NO binding capacity. Thus, Co(III)His biological reduction is an indispensable step in CABR process. Co(III)His reduction by Paracoccus versutus LYM under aerobic condition in the presence of nitrate or nitrite was investigated. Results indicated that simultaneous Co(III)His reduction and aerobic denitrification were achieved by strain LYM. Co(III)His reduction was significantly promoted by denitrification process, but dramatically inhibited by 5-15 mM sulfite. Co(II)His absorbent regeneration could be facilitated by adjusting O supply properly or adding nitrogen and carbon source regularly. These findings provide a basis for the application of Co(II)His as the absorbent in the CABR process and qualify P. versutus LYM as an applicable and competitive strain for this process.
钴（II）-组氨酸 [Co（II）His] 由于其更高的氧化还原可逆性，有望成为化学吸收-生物还原（CABR）烟气脱硝过程中铁复合物的更好替代品。尽管钴（II）His 具有出色的耐氧能力，但仍会逐渐被氧化成 Co（III）His，从而失去对 NO 的结合能力。因此，Co（III）His 的生物还原是 CABR 过程中不可或缺的一步。考察了在有氧条件下、存在硝酸盐或亚硝酸盐时，鞘氨醇单胞菌 LYM 对 Co（III）His 的还原作用。结果表明，LYM 菌株同时实现了 Co（III）His 的还原和有氧反硝化。反硝化过程显著促进了 Co（III）His 的还原，但 5-15 mM 的亚硫酸盐会强烈抑制其还原。通过适当调节氧气供应或定期添加氮源和碳源，可促进 Co（II）His 吸收剂的再生。这些发现为 Co（II）His 作为 CABR 过程中吸收剂的应用提供了依据，并使鞘氨醇单胞菌 LYM 成为该过程中一种适用且具有竞争力的菌株。
