在全球工業(yè)化進(jìn)程加速的當(dāng)下，工業(yè)廢氣排放帶來的環(huán)境污染問題日益嚴(yán)峻。其中，含硫廢氣不僅會引發(fā)酸雨，腐蝕建筑、破壞生態(tài)，還對人體呼吸道等造成嚴(yán)重?fù)p害，危害公眾健康。在此背景下，高效脫硫技術(shù)成為環(huán)保領(lǐng)域的焦點(diǎn)。傳統(tǒng)的濕法、干法脫硫雖應(yīng)用廣泛，但存在能耗高、成本貴、易產(chǎn)生二次污染等難題。生物脫硫技術(shù)應(yīng)運(yùn)而生，以其獨(dú)特優(yōu)勢，為工業(yè)廢氣凈化開辟新路徑，成為環(huán)?？蒲信c產(chǎn)業(yè)界的研究熱點(diǎn)。

In the current acceleration of global industrialization, the environmental pollution caused by industrial waste gas emissions is becoming increasingly severe. Among them, sulfur-containing waste gas not only causes acid rain, corrodes buildings, and damages ecology, but also causes serious damage to human respiratory tract and endangers public health. In this context, efficient desulfurization technology has become a focus in the field of environmental protection. Although traditional wet and dry desulfurization methods are widely used, they face challenges such as high energy consumption, high cost, and susceptibility to secondary pollution. Biological desulfurization technology has emerged, with its unique advantages, opening up new paths for industrial waste gas purification and becoming a research hotspot in environmental protection research and industry.

生物脫硫技術(shù)原理

Principles of biological desulfurization technology

異養(yǎng)型微生物脫硫機(jī)制

Mechanism of heterotrophic microbial desulfurization

異養(yǎng)型微生物參與生物脫硫過程，通常利用有機(jī)物作為碳源和能源，在代謝過程中實(shí)現(xiàn)對含硫化合物的轉(zhuǎn)化。部分異養(yǎng)菌可將有機(jī)硫化合物，如二苯并噻吩（DBT）等，通過特定的酶促反應(yīng)，使碳 - 硫（C - S）鍵斷裂，將硫原子從有機(jī)分子中分離出來，并轉(zhuǎn)化為可進(jìn)一步處理的無機(jī)硫形式。其代謝途徑較為復(fù)雜，涉及多種酶的協(xié)同作用。例如，某些菌株可通過 “4S” 途徑降解 DBT，即先將 DBT 氧化為二苯并噻吩亞砜，再進(jìn)一步氧化為二苯并噻吩砜，接著生成 2 - 羥基聯(lián)苯和亞硫酸鹽，最終亞硫酸鹽被氧化為硫酸鹽，而碳骨架則保留在產(chǎn)物中，實(shí)現(xiàn)了硫的特異性脫除 。

Heterotrophic microorganisms participate in the process of biological desulfurization, usually using organic matter as a carbon source and energy source to achieve the conversion of sulfur-containing compounds in the metabolic process. Some heterotrophic bacteria can break the carbon sulfur (C-S) bond of organic sulfur compounds such as dibenzothiophene (DBT) through specific enzymatic reactions, separating sulfur atoms from organic molecules and converting them into inorganic sulfur forms that can be further processed. Its metabolic pathway is relatively complex, involving the synergistic action of multiple enzymes. For example, some strains can degrade DBT through the "4S" pathway, which first oxidizes DBT to dibenzothiophene sulfoxide, then further oxidizes it to dibenzothiophene sulfone, followed by the formation of 2-hydroxybiphenyl and sulfite. Eventually, sulfite is oxidized to sulfate, while the carbon skeleton remains in the product, achieving specific removal of sulfur.

微生物協(xié)同脫硫機(jī)制

Microbial synergistic desulfurization mechanism

實(shí)際的生物脫硫系統(tǒng)中，多種微生物往往協(xié)同作用，形成復(fù)雜的生態(tài)群落。不同微生物利用各自的代謝優(yōu)勢，接力完成含硫化合物的轉(zhuǎn)化。比如，在一些生物反應(yīng)器中，化能自養(yǎng)型微生物先將H?S等簡單含硫化合物初步氧化為單質(zhì)硫，為后續(xù)的異養(yǎng)型微生物提供底物。異養(yǎng)型微生物則可利用單質(zhì)硫或其他中間產(chǎn)物，在消耗有機(jī)物的同時(shí)，進(jìn)一步將硫轉(zhuǎn)化為穩(wěn)定的硫酸鹽，或者在合適條件下將部分硫還原為單質(zhì)硫沉淀，實(shí)現(xiàn)硫的回收利用。這種協(xié)同作用使得生物脫硫系統(tǒng)更加穩(wěn)定、高效，能適應(yīng)更復(fù)雜的含硫廢氣組成和工況條件 。

In actual biological desulfurization systems, multiple microorganisms often work together to form complex ecological communities. Different microorganisms utilize their respective metabolic advantages to relay the conversion of sulfur-containing compounds. For example, in some bioreactors, chemoautotrophic microorganisms first oxidize simple sulfur-containing compounds such as H ? S to elemental sulfur, providing substrates for subsequent heterotrophic microorganisms. Heterotrophic microorganisms can utilize elemental sulfur or other intermediate products to further convert sulfur into stable sulfates while consuming organic matter, or reduce some sulfur to elemental sulfur precipitate under appropriate conditions, achieving sulfur recovery and utilization. This synergistic effect makes the biological desulfurization system more stable and efficient, and can adapt to more complex sulfur-containing waste gas compositions and operating conditions.

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