生物脫硫的核心過(guò)程是多硫化物介導(dǎo)的硫循環(huán)，通過(guò)化學(xué)氧化與生物代謝的耦合作用實(shí)現(xiàn)硫化氫向單質(zhì)硫的轉(zhuǎn)化與分離。多硫化物既是生物脫硫過(guò)程的中間產(chǎn)物，也是硫氧化菌代謝過(guò)程的關(guān)鍵底物，其濃度與鏈長(zhǎng)分布直接影響著單質(zhì)硫的選擇性及分離效率。在微生物作用機(jī)制方面，生物脫硫依賴于特定功能微生物的代謝活動(dòng)。以硫酸鹽還原菌和硫氧化細(xì)菌為代表的功能菌株，能夠“吃掉”硫化物。硫酸鹽還原菌將硫酸根和亞硫酸根還原成硫離子，硫氧化菌再將硫離子轉(zhuǎn)化為生物硫黃。這一過(guò)程通過(guò)氧化還原電位的合理調(diào)控實(shí)現(xiàn)選擇性轉(zhuǎn)化，既可以選擇性地將硫化氫氧化為單質(zhì)硫，也可以進(jìn)一步氧化為硫酸鹽。

The core process of biological desulfurization is the sulfur cycle mediated by polysulfides, which achieves efficient conversion and separation of hydrogen sulfide to elemental sulfur through the coupling effect of chemical oxidation and biological metabolism. Polysulfides are not only intermediate products in biological desulfurization processes, but also key substrates in the metabolic processes of sulfur oxidizing bacteria. Their concentration and chain length distribution directly affect the selectivity and separation efficiency of elemental sulfur. In terms of microbial mechanisms, biological desulfurization relies on the metabolic activity of specific functional microorganisms. Functional strains represented by sulfate reducing bacteria and sulfur oxidizing bacteria can "eat" sulfides. Sulfate reducing bacteria reduce sulfate and sulfite ions to sulfur ions, which are then converted into biological sulfur by sulfur oxidizing bacteria. This process achieves selective conversion through precise regulation of redox potential, which can selectively oxidize hydrogen sulfide to elemental sulfur or further oxidize it to sulfate.

從工藝實(shí)現(xiàn)形式來(lái)看，生物脫硫主要有生物過(guò)濾法、生物吸附法和生物滴濾法等技術(shù)路線。其中，生物滴濾塔技術(shù)是非常具代表性的應(yīng)用形式之一。生物滴濾塔裝置主要由堿吸收池、厭氧反應(yīng)器和好氧反應(yīng)器三部分組成。其工作原理是：含硫氣體首先通入堿吸收池，使硫化物轉(zhuǎn)化為亞硫酸根離子和硫酸根離子；隨后在厭氧反應(yīng)器中，硫酸鹽還原菌將上述離子還原為硫離子；非常后在好氧反應(yīng)器中，硫氧化菌將硫離子氧化為單質(zhì)硫。這一“堿吸收—厭氧還原—好氧氧化”的完整工藝流程，實(shí)現(xiàn)了氣體凈化與資源化利用的有機(jī)結(jié)合。通過(guò)優(yōu)化填料設(shè)計(jì)與氣液流動(dòng)路徑，生物滴濾塔具備占地面積小、結(jié)構(gòu)緊湊、運(yùn)行可靠等優(yōu)點(diǎn)。

From the perspective of process implementation forms, biological desulfurization mainly includes technical routes such as biological filtration, biological adsorption, and biological drip filtration. Among them, biological drip filtration tower technology is one of the most representative application forms. The biological drip filtration tower device mainly consists of three parts: alkali absorption tank, anaerobic reactor, and aerobic reactor. Its working principle is: sulfur-containing gas is first introduced into the alkali absorption tank, converting sulfides into sulfite ions and sulfate ions; Subsequently, in the anaerobic reactor, sulfate reducing bacteria reduce the aforementioned ions to sulfur ions; Finally, in the aerobic reactor, sulfur oxidizing bacteria oxidize sulfur ions into elemental sulfur. This complete process of "alkali absorption anaerobic reduction aerobic oxidation" achieves the organic combination of gas purification and resource utilization. By optimizing the packing design and gas-liquid flow path, the biological drip filtration tower has the advantages of small footprint, compact structure, and reliable operation.

生物脫硫技術(shù)已在工業(yè)領(lǐng)域取得了顯著的工程應(yīng)用成果。以天然氣脫硫?yàn)槔捎蒙锩摿蚣夹g(shù)處理后，二氧化硫濃度可從6500毫克/標(biāo)準(zhǔn)立方米降至小于10毫克/標(biāo)準(zhǔn)立方米，去除率達(dá)到99.8%。該技術(shù)不僅實(shí)現(xiàn)了硫化物的轉(zhuǎn)化，還可回收單質(zhì)硫作為農(nóng)業(yè)用硫黃。當(dāng)前，生物脫硫的技術(shù)瓶頸主要集中于菌株篩選與脫硫穩(wěn)定性的優(yōu)化。隨著功能微生物篩選技術(shù)的進(jìn)步和反應(yīng)器設(shè)計(jì)的不斷優(yōu)化，生物脫硫正朝著更率、更強(qiáng)穩(wěn)定性的方向持續(xù)發(fā)展，在石油、天然氣及工業(yè)廢氣處理領(lǐng)域展現(xiàn)出廣闊的應(yīng)用前景

Biological desulfurization technology has achieved significant engineering application results in the industrial field. Taking natural gas desulfurization as an example, after using biological desulfurization technology, the concentration of sulfur dioxide can be reduced from 6500 milligrams per standard cubic meter to less than 10 milligrams per standard cubic meter, with a removal rate of 99.8%. This technology not only achieves efficient conversion of sulfides, but also recovers elemental sulfur as agricultural sulfur. Currently, the technological bottleneck of biological desulfurization mainly focuses on strain screening and optimization of desulfurization stability. With the advancement of functional microbial screening technology and continuous optimization of reactor design, biological desulfurization is continuously developing towards higher efficiency and stronger stability, showing broad application prospects in the fields of petroleum, natural gas, and industrial waste gas treatment

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