硫氧化细菌源单质硫的生成、转运和回收

单质硫(硫粒)是硫化物生物氧化的中间产物。按化学计量式精准调控O/S比(溶解氧与硫化物的摩尔比),单质硫可成为硫氧化细菌(Sulfur-oxidizing bacteria,SOB)的主要代谢产物。根据单质硫的分布,单质硫可分为胞内硫粒和胞外硫粒。单质硫由胞内向胞外的跨膜转运过程是泌硫型SOB的重要生理特征。从生物脱硫系统中回收单质硫,可实现废物资源化,具有重大意义。本文综述了硫氧化细菌源单质硫的生成过程、赋存形式、代谢特性、转运机理及生物脱硫系统中的单质硫回收,以期为新型泌硫型生物脱硫工艺的研发提供参考。

Formation, transport and recovery of biogenic elemental sulfur from sulfur-oxidizing bacteria

Elemental sulfur (sulfur globules) is an intermediate product of biological oxidation of sulfide. Elemental sulfur can be the main metabolite of sulfur-oxidizing bacteria (SOB) according to stoichiometric O/S ratio. According to the distribution of elemental sulfur, they can be divided into intracellular sulfur globules and extracellular sulfur globules. The transmembrane transport of elemental sulfur from the inside to outside of cell is an important physiological characteristic of sulfur-secreting SOB. Recovery of elemental sulfur from biodesulfurization system is of great significance to the realization of waste recycling. In this paper, the formation process, occurrence form, metabolic characteristics, transport mechanism of elemental sulfur in SOB and the recovery of elemental sulfur from biodesulfurization system were reviewed in order to provide a reference for the research and development of a new biodesulfurization process.