Pretreatment technology of biogas biological desulfurization front end

1.当产气原料为畜禽粪便、餐厨垃圾、垃圾渗滤液等能产生灰尘的沼气之前，应做沼气除尘预处理，预处理设备有洗气塔(湿式)、除尘塔（干式）。

1. Before the raw materials for gas production are livestock manure, kitchen waste, landfill leachate and other biogas that can produce dust, biogas dust removal pretreatment shall be carried out. The pretreatment equipment includes gas washing tower (wet) and dust removal tower (dry).

2.生物脱硫的水源如果是地下水等含盐量较大时，应对自来水增设软化水装置。

2. If the water source for biological desulfurization is groundwater with large salt content, a softened water device shall be added to the tap water.

3.当预处理沼气中带有大量的氨气时，如甲方要求处理时，可在湿式洗气系统中的循环水中宜放适当的盐酸或硫酸，酸性循环水可以吸收氨气，当洗气系的循环水接近饱和时，应及时排掉，换循环水。

3. When there is a large amount of ammonia in the pretreated biogas, if Party A requires treatment, appropriate hydrochloric acid or sulfuric acid can be put into the circulating water in the wet gas washing system, and the acidic circulating water can absorb ammonia. When the circulating water of the gas washing system is close to saturation, it should be discharged in time and replaced with circulating water.

4.当预处理沼气温度在40度以上时，沼气在生物脱硫前，应做降温处理。降温下降到35度以下为宜。

4. When the temperature of pretreated biogas is above 40 ℃, the biogas shall be cooled before biological desulfurization. The temperature should drop below 35 degrees.

5.当预处理沼气的压力小于3Kpa时，沼气在生物脱硫之前，应对沼气进行增压，增压到3kpa以上。

5. When the pressure of pretreated biogas is less than 3kpa, the biogas shall be pressurized to more than 3kpa before biological desulfurization.

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