Kalantari Hamed, Nosrati Mohsen, Shojaosadati Seyed Abbas, Shavandi Mahmoud
a Biotechnology Group, Faculty of Chemical Engineering , Tarbiat Modares University , Tehran , Iran.
b Environment and Biotechnology Group , Research Institute of Petroleum Industry , Tehran , Iran.
Environ Technol. 2018 Jun;39(12):1597-1606. doi: 10.1080/09593330.2017.1334707. Epub 2017 Jun 14.
In the present study, the production of various transient forms of sulfur during biological oxidation of sulfidic spent caustics under haloalkaline conditions in a stirred tank bioreactor is investigated. Also, the effects of abiotic aeration (chemical oxidation), dissolved oxygen (DO) concentration and sodium concentration on forms of sulfur during biological treatment are demonstrated. Thioalkalivibrio versutus strain was used for sulfide oxidation in spent caustic (SC). The aeration had an important effect on sulfide oxidation and its final products. At DO concentrations above 2 mg l, majority of sulfide was oxidized to sulfate. Maximum sulfide removal efficiency (%R) and yield of sulfate production [Formula: see text] was obtained in Na concentration ranging from 0.6 to 2 M. Abiotic aeration, which is the most important factor of production of thiosulfate, resulted in the formation of an undesired product-polysulfide. However, abiotic aeration can be used as a pretreatment to biological treatment. In the bioreactor the removal efficiency was obtained as 82.7% and various forms of sulfur such as polysulfide, biosulfur, thiosulfate and sulfate was observed during biological treatment of SC.
在本研究中，对搅拌槽式生物反应器中卤碱性条件下硫化废碱液生物氧化过程中各种瞬态硫形态的产生进行了研究。此外，还展示了非生物曝气（化学氧化）、溶解氧（DO）浓度和钠浓度对生物处理过程中硫形态的影响。使用多形硫代碱弧菌菌株对废碱液（SC）中的硫化物进行氧化。曝气对硫化物氧化及其最终产物有重要影响。在DO浓度高于2 mg·l时，大部分硫化物被氧化为硫酸盐。在钠浓度为0.6至2 M的范围内，获得了最大的硫化物去除效率（%R）和硫酸盐产量[公式：见原文]。非生物曝气是硫代硫酸盐产生的最重要因素，会导致形成不期望的产物——多硫化物。然而，非生物曝气可作为生物处理的预处理。在生物反应器中，去除效率达到82.7%，并且在SC的生物处理过程中观察到了多硫化物、生物硫、硫代硫酸盐和硫酸盐等各种硫形态。
