Environmental Technology, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands; Paqell B.V., Reactorweg 301, 3542 AD Utrecht, The Netherlands.
Paqell B.V., Reactorweg 301, 3542 AD Utrecht, The Netherlands; Department of Earth Sciences, Utrecht University, Princetonlaan 8, 3584 CB Utrecht, The Netherlands.
J Hazard Mater. 2022 Feb 15;424(Pt D):127696. doi: 10.1016/j.jhazmat.2021.127696. Epub 2021 Nov 7.
We investigated the effect of polysulfide formation on properties of biologically produced elemental sulfur (S) crystals, which are produced during biological desulfurization (BD) of gas. The recent addition of an anoxic-sulfidic reactor (AnSuR) to the BD process resulted in agglomerated particles with better settleability for S separation. In the AnSuR, polysulfides are formed by the reaction of bisulfide (HS) with S and are subsequently oxidized to S in a gas-lift reactor. Therefore, sulfur particles from the BD are shaped (i.e. morphology and particle size) both by formation and dissolution. We assessed the reaction of HS with S particles in anoxic, abiotic experiments in a batch reactor using two S samples from industrial BD reactors. Under these conditions, the sulfur particle surface became coarser and more porous, and in addition the smallest particles disappeared. Agglomerates initially fell apart but were reformed at a later stage. Moreover, we found different observed polysulfide formation rates for each S sample, which was related to the initial morphology and size. Our findings show that particle properties can be controlled abiotically and that settleability of S is increased by increasing both the HS-S ratio and retention time.
我们研究了多硫化物形成对生物脱硫（BD）过程中产生的元素硫（S）晶体性质的影响。最近在 BD 工艺中添加了缺氧-硫化物反应器（AnSuR），这导致了具有更好沉降性能的 S 分离的团聚颗粒。在 AnSuR 中，多硫化物通过 HS 与 S 的反应形成，然后在气体升力反应器中被氧化为 S。因此，BD 中的硫颗粒的形状（即形态和粒径）既通过形成又通过溶解来控制。我们在缺氧、非生物批处理反应器中使用来自工业 BD 反应器的两个 S 样品评估了 HS 与 S 颗粒的反应。在这些条件下，硫颗粒表面变得更粗糙且多孔，此外，最小的颗粒消失了。团聚体最初解体，但在后期重新形成。此外，我们发现每个 S 样品的观察到的多硫化物形成速率不同，这与初始形态和尺寸有关。我们的研究结果表明，颗粒性质可以通过非生物方法控制，并且通过增加 HS-S 比和停留时间可以提高 S 的沉降性能。
