TY - JOUR
T1 - Novel Agglomeration Strategy for Elemental Sulfur Produced during Biological Gas Desulfurization
AU - Mol, Annemerel R.
AU - Meuwissen, Derek J.M.
AU - Pruim, Sebastian D.
AU - Zhou, Chenyu
AU - Van Vught, Vincent
AU - Klok, Johannes B.M.
AU - Buisman, Cees J.N.
AU - Van Der Weijden, Renata D.
PY - 2021/10/26
Y1 - 2021/10/26
N2 - This article presents a novel crystal agglomeration strategy for elemental sulfur (S) produced during biological desulfurization (BD). A key element is the nucleophilic dissolution of S by sulfide (HS-) to polysulfides (Sx2-), which was enhanced by a sulfide-rich, anoxic reactor. This study demonstrates that with enhanced Sx2- formation, crystal agglomerates are formed with a uniform size (14.7 ± 3.1 μm). In contrast, with minimal Sx2- formation, particle size fluctuates markedly (5.6 ± 5.9 μm) due to the presence of agglomerates and single crystals. Microscopic analysis showed that the uniformly sized agglomerates had an irregular structure, whereas the loose particles and agglomerates were more defined and bipyramidal. The irregular agglomerates are explained by dissolution of S by (poly)sulfides, which likely changed the crystal surface structure and disrupted crystal growth. Furthermore, S from Sx2- appeared to form at least 5× faster than from HS- based on the average Sx2- chain length of x ≈ 5, thereby stimulating particle agglomeration. In addition, microscopy suggested that S crystal growth proceeded via amorphous S globules. Our findings imply that the crystallization product is controlled by the balance between dissolution and formation of S. This new insight has a strong potential to prevent poor S settleability in BD.
AB - This article presents a novel crystal agglomeration strategy for elemental sulfur (S) produced during biological desulfurization (BD). A key element is the nucleophilic dissolution of S by sulfide (HS-) to polysulfides (Sx2-), which was enhanced by a sulfide-rich, anoxic reactor. This study demonstrates that with enhanced Sx2- formation, crystal agglomerates are formed with a uniform size (14.7 ± 3.1 μm). In contrast, with minimal Sx2- formation, particle size fluctuates markedly (5.6 ± 5.9 μm) due to the presence of agglomerates and single crystals. Microscopic analysis showed that the uniformly sized agglomerates had an irregular structure, whereas the loose particles and agglomerates were more defined and bipyramidal. The irregular agglomerates are explained by dissolution of S by (poly)sulfides, which likely changed the crystal surface structure and disrupted crystal growth. Furthermore, S from Sx2- appeared to form at least 5× faster than from HS- based on the average Sx2- chain length of x ≈ 5, thereby stimulating particle agglomeration. In addition, microscopy suggested that S crystal growth proceeded via amorphous S globules. Our findings imply that the crystallization product is controlled by the balance between dissolution and formation of S. This new insight has a strong potential to prevent poor S settleability in BD.
U2 - 10.1021/acsomega.1c03701
DO - 10.1021/acsomega.1c03701
M3 - Article
AN - SCOPUS:85118675104
SN - 2470-1343
VL - 6
SP - 27913
EP - 27923
JO - ACS Omega
JF - ACS Omega
IS - 42
ER -