College of Environmental Science and Engineering, Zhejiang Gongshang University, No.18 Xuezheng Street, Hangzhou, Zhejiang Province, China.
Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, Pakistan.
Environ Sci Pollut Res Int. 2021 Jul;28(27):36226-36233. doi: 10.1007/s11356-021-13269-y. Epub 2021 Mar 9.
The production and characteristics of elemental sulfur were examined during simultaneous sulfide and nitrate removal, with abiotic assays as control. The biotic assay showed good sulfide and nitrate removal, with the respective removal percentage of which were 90.67-96.88% and 100%. Nitrate reduction resulted in the production of nitrogen gas, while sulfate formed due to sulfide oxidation. The concentration of elemental sulfur in the effluent was greater than that in the sludge, which accounted for 73.70-86.28% of total elemental sulfur produced. Furthermore, the elemental sulfur of the effluent and sludge from the biotic assays was orthorhombic crystal S. Elemental sulfur was normally distributed in the effluent, but its average diameter increased with the increasing influent sulfide concentration (60-300 mg S/L), where the average diameter increased from 10 (60 mg S/L) to 29 μm (300 mg S/L).
考察了在同时去除硫化物和硝酸盐的过程中元素硫的产生和特性，并进行了非生物实验作为对照。生物实验显示出良好的硫化物和硝酸盐去除效果，去除率分别为 90.67-96.88%和 100%。硝酸盐还原导致氮气的产生，而由于硫化物氧化形成了硫酸盐。流出物中的元素硫浓度大于污泥中的元素硫浓度，占总生成的元素硫的 73.70-86.28%。此外，生物实验中流出物和污泥中的元素硫为正交晶型 S。元素硫在流出物中呈正态分布，但随着进水硫化物浓度（60-300mg S/L）的增加，其平均直径也增加，从 10μm（60mg S/L）增加到 29μm（300mg S/L）。
