硫化氢是天然气、江南网站_江南online(中国)、炼厂气里非常常见的“毒瘤”。它腐蚀管道、毒化催化剂、燃烧后变成二氧化硫排进大气。传统的络合铁法脱硫效率高，但对付不了有机硫（COS、甲硫醇），且药剂消耗和废液处理成本逐年走高。生物脱硫的逻辑完全不同——不靠化学药剂“中和”，靠微生物“吃”。

Hydrogen sulfide is the most common "tumor" in natural gas, biogas, and refinery gas. It corrodes pipelines, poisons catalysts, and after combustion, it becomes sulfur dioxide and is released into the atmosphere. The traditional chelated iron method has high desulfurization efficiency, but it cannot deal with organic sulfur (COS, methyl mercaptan), and the consumption of reagents and the cost of waste liquid treatment are increasing year by year. The logic of biological desulfurization is completely different - it does not rely on chemical agents to "neutralize", but on microorganisms to "eat".

菌种是这套技术的核心资产。

Bacterial strains are the core asset of this technology.

脱硫微生物分两大类：硫酸盐还原菌把硫酸根还原成硫离子，硫氧化菌再把硫离子氧化成单质硫。南京工业大学胡永红团队经过数千次实验，筛选驯化出高活性、高耐受性的特种菌株，开发了“生物滴滤塔”工艺：碱吸收池先把二氧化硫转化为亚硫酸根和硫酸根，厌氧反应器里的硫酸盐还原菌将其还原为硫离子，好氧反应器里的硫氧化菌再把硫离子转化为生物硫磺——一种可农用的资源化产物。

There are two main types of desulfurization microorganisms: sulfate reducing bacteria reduce sulfate ions to sulfur ions, and sulfur oxidizing bacteria oxidize sulfur ions to elemental sulfur. After thousands of experiments, the team led by Hu Yonghong from Nanjing University of Technology has screened and domesticated highly active and tolerant special strains of bacteria, and developed the "biological drip filtration tower" process: the alkali absorption tank first converts sulfur dioxide into sulfite and sulfate ions, the sulfate reducing bacteria in the anaerobic reactor reduce it to sulfur ions, and the sulfur oxidizing bacteria in the aerobic reactor then convert sulfur ions into biological sulfur - a resource product that can be used for agriculture.

实际运行数据很硬：西南油气田彭州3号脱硫站应用后，二氧化硫浓度从6500mg/m³降至小于10mg/m³，去除率99.8%。

The actual operating data is very hard: after the application of the Pengzhou No.3 desulfurization station in Southwest Oil and Gas Field, the sulfur dioxide concentration decreased from 6500mg/m ³ to less than 10mg/m ³, with a removal rate of 99.8%.

但生物脱硫不是万能的，选型要看清楚边界。

But biological desulfurization is not omnipotent, and the selection should be based on clear boundaries.

非常主流的工业应用是Thiopaq工艺，自1990年代以来全球已有超过200套装置用于江南网站_江南online(中国)脱硫，另有约15套用于油气行业。它适合的工况很宽：硫化氢浓度从100ppm到100vol%大多能处理，操作压力0.1到7.5MPa。核心江南网站_江南online(中国) 是温和条件运行——常温常压，不用有毒化学品。

The most mainstream industrial application is the Thiopaq process, which has been used for biogas desulfurization in over 200 units worldwide since the 1990s, with an additional 15 units used in the oil and gas industry. It is suitable for a wide range of operating conditions: it can handle hydrogen sulfide concentrations from 100ppm to 100vol%, with operating pressures ranging from 0.1 to 7.5MPa. The core advantage is mild operating conditions - normal temperature and pressure, without the use of toxic chemicals.

工程上的核心参数是氮硫比（N/S）。这个比值直接决定产物走向：N/S控制在0.4mol/mol左右，硫化物倾向于生成单质硫（可回收）；N/S升到1.6mol/mol，硫化物会被有效氧化成硫酸盐（没有回收价值，还消耗更多碱液）。选生物脱硫，本质上是在选“要硫磺还是要废水”。

The core parameter in engineering is the nitrogen sulfur ratio (N/S). This ratio directly determines the direction of the product: N/S is controlled at around 0.4mol/mol, and sulfides tend to form elemental sulfur (which can be recovered); When the N/S ratio increases to 1.6 mol/mol, sulfides will be completely oxidized to sulfates (with no recycling value and consuming more alkaline solution). Choosing biological desulfurization essentially means choosing whether to use sulfur or wastewater.

有机硫是传统生物脱硫的软肋。

Organic sulfur is the weakness of traditional biological desulfurization.

硫化氢好处理，但COS（羰基硫）和甲硫醇（MeSH）才是真正的硬骨头。络合铁法对硫化氢去除率接近100%，对COS的去除率却不到35%。生物法在这方面反而有突破：有研究将脱硫菌株TYWJ-1整合进络合铁溶液，形成“生物络合铁系统”，对硫化氢保持100%去除的同时，MeSH去除率从58%提升到95%以上，COS去除率从35%提升到55%。

Hydrogen sulfide is easy to handle, but COS (carbonyl sulfide) and methyl mercaptan (MeSH) are the real hard bones. The removal rate of hydrogen sulfide by chelated iron method is close to 100%, but the removal rate of COS is less than 35%. Biological methods have made breakthroughs in this regard: some studies have integrated the desulfurization strain TYWJ-1 into a chelated iron solution to form a "biological chelated iron system", which maintains 100% removal of hydrogen sulfide while increasing the MeSH removal rate from 58% to over 95% and the COS removal rate from 35% to 55%.

堵塞是运行中非常头疼的问题。

Blockage is the most headache inducing problem during operation.

生物滴滤塔运行一段时间后，生物质和单质硫在填料上积累，导致压降飙升、甚至淹塔。解决办法有两个方向：一是控制进气硫化氢浓度，有日本团队开发“循环气体型”工艺，将部分处理后气体回流稀释进气，把硫化氢控制在300到600ppm，既硫沉淀又维持处理效率；二是选对填料和定期反冲洗，这是运营维护的基本功。

After running for a period of time, biomass and elemental sulfur accumulate on the packing material of the biological drip filtration tower, leading to a surge in pressure drop and even flooding of the tower. There are two directions for the solution: one is to control the concentration of hydrogen sulfide in the intake. A Japanese team has developed a "circulating gas type" process, which dilutes some of the treated gas reflux into the intake and controls hydrogen sulfide at 300 to 600 ppm, which not only inhibits sulfur precipitation but also maintains treatment efficiency; The second is to select the right packing material and conduct regular backwashing, which are the basic skills of operation and maintenance.

选生物脱硫之前，先问自己三个问题：

Before choosing biological desulfurization, ask yourself three questions:

气源里有没有有机硫？有的话，纯生物法搞不定，需要生物+络合铁组合。硫化氢浓度波动大不大？波动剧烈时生物系统恢复慢，前处理缓冲要留够。有没有现成的硝酸盐或亚硝酸盐来源？缺氧型生物脱硫需要硝酸盐做电子受体，如果厂里正好有硝化废水，这套系统就能“以废治废”。

Is there organic sulfur in the gas source? If possible, pure biological methods are not feasible and require a combination of biological and chelated iron. Does the concentration of hydrogen sulfide fluctuate greatly? When the fluctuations are severe, the recovery of biological systems is slow, and sufficient pre-processing buffer should be left. Is there a ready-made source of nitrate or nitrite? Anaerobic biological desulfurization requires nitrate as an electron acceptor. If there happens to be nitrification wastewater in the factory, this system can "treat waste with waste".

生物脱硫的本质，是用微生物的代谢把硫从气里“搬”到固相里。搬得好是资源，搬不好是麻烦。菌种选对、氮硫比控对、堵塞防住——这三条做到了，脱硫才真正省钱又省心。

The essence of biological desulfurization is to use the metabolism of microorganisms to transfer sulfur from the gas to the solid phase. Moving well is a resource, moving poorly is troublesome. By selecting the right bacterial strains, controlling the nitrogen sulfur ratio, and preventing blockages, desulfurization can truly save money and worry.

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