沼氣作為一種新興能源其應(yīng)用越來(lái)越廣泛，在我國(guó)環(huán)保標(biāo)準(zhǔn)中嚴(yán)格規(guī)定，利用沼氣能源時(shí)，沼氣氣體中H2S 含量不得超過(guò)20mg/m3 。無(wú)論在工業(yè)或民用氣體中， 都需要盡可能的除去H2S。沼氣作為能源利用已有很長(zhǎng)的歷史。沼氣中的硫主要以H2S的形式存在，也可能含有少量的硫醇等其他硫化物。H2S的濃度受發(fā)酵原料和發(fā)酵工藝的影響很大，蛋白質(zhì)或硫酸鹽含量高的原料，發(fā)酵沼氣中硫化氫的含量較高。由于H2S腐蝕性強(qiáng)，通常在凈化步驟的早期進(jìn)行去除。沼氣可用于農(nóng)戶炊事、照明等生活用能，也可用于農(nóng)副產(chǎn)品的生產(chǎn)、加工，如沼氣養(yǎng)蠶、沼氣孵化、沼氣育雛、沼氣育秧、誘蛾養(yǎng)蠶、沼氣儲(chǔ)糧、沼氣保鮮、沼氣炒茶、蛋雞增光、大棚種植、農(nóng)產(chǎn)品干燥和烤瓷工藝品等。
As an emerging energy, biogas is more and more widely used. It is strictly stipulated in China's environmental protection standards that when using biogas energy, the H2S content in biogas gas shall not exceed 20mg / m3. No matter in industrial or civil gas, H2S needs to be removed as much as possible. Biogas has been used as energy for a long time. The sulfur in biogas mainly exists in the form of H2S, and may also contain a small amount of mercaptan and other sulfides. The concentration of H2S is greatly affected by fermentation raw materials and fermentation process. Raw materials with high protein or sulfate content have high content of hydrogen sulfide in fermented biogas. Because H2S is highly corrosive, it is usually removed in the early stage of purification step. Biogas can be used for household energy consumption such as cooking and lighting, as well as the production and processing of agricultural and sideline products, such as biogas silkworm rearing, biogas incubation, biogas brooding, biogas seedling raising, moth induction and silkworm rearing, biogas grain storage, biogas preservation, biogas tea frying, egg brightening, greenhouse planting, drying of agricultural products and porcelain crafts.
沼氣生物脫硫是利用生物菌種去除沼氣中腐蝕性強(qiáng)、毒性強(qiáng)的硫化氫氣體的一種工藝方法，這個(gè)工藝具有自動(dòng)化程度高，流程簡(jiǎn)潔，運(yùn)行成本低等優(yōu)點(diǎn)。生物脫硫技術(shù)包括生物過(guò)濾法、生物吸附法和生物滴濾法，三種系統(tǒng)均屬開放系統(tǒng)，其微生物種群隨環(huán)境改變而變化。在生物脫硫過(guò)程中，氧化態(tài)的含硫污染物需要先經(jīng)生物還原作用生成硫化物或H2S然后再經(jīng)生物氧化過(guò)程生成單質(zhì)硫，才能去除。沼氣經(jīng)過(guò)吸收凈化可資源利用，即實(shí)現(xiàn)了節(jié)能減排，也節(jié)約了企業(yè)的生產(chǎn)成本。
Biogas biological desulfurization is a process method of using biological bacteria to remove highly corrosive and toxic hydrogen sulfide gas in biogas. This process has the advantages of high automation, simple process and low operation cost. Biological desulfurization technology includes biological filtration, biological adsorption and biological trickle filtration. The three systems are open systems, and their microbial populations change with the change of environment. In the process of biological desulfurization, the oxidized sulfur-containing pollutants need to be removed by first generating sulfide or H2S through biological reduction, and then generating elemental sulfur through biological oxidation. After absorption and purification, biogas can be used as resources, which not only realizes energy conservation and emission reduction, but also saves the production cost of enterprises.
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