The widely used biogas purification technologies include pressure swing adsorption, water washing, physical absorption of organic solvents, chemical absorption of organic solvents, high pressure membrane separation and low temperature purification. In Sweden, pressurized water washing is the most widely used method; in Germany, pressure swing adsorption is more widely used; in the Netherlands, pressurized water washing, pressure swing adsorption and membrane separation technology are more common.

沼气提纯成本与原料气甲烷含量以及成品甲烷含量有关。甲烷含量高的原始沼气提纯成本更低。这主要由于能量输出的增加，而总成本与高能级有关。可以通过提高效率（降低单位输出能耗），使用高热值的原始沼气降低实际能耗，从而降低成本。

The cost of biogas purification is related to the methane content of raw gas and the methane content of finished products. The original biogas with high methane content has lower purification cost. This is mainly due to the increase of energy output, and the total cost is related to high energy levels. The actual energy consumption can be reduced by increasing efficiency (reducing energy consumption per unit output) and using high calorific value of raw biogas, thus reducing the cost.

沼气提纯站的经济效益还与其他因素有关，例如，可操作性和额定负荷。沼气提纯站的额定运行负荷不仅取决于提纯站自身的高度稳定性，而且与原始沼气流量和后续单元（如充电站和加气站）的可靠性有关。

The economic benefits of biogas purification stations are also related to other factors, such as operability and rated load. The rated operating load of biogas purification station depends not only on the high stability of the purification station itself, but also on the reliability of the original biogas flow rate and subsequent units, such as charging station and gas station.

停机时间短，设备运行良好，在额定负荷和足够原料气的条件下设备能正常连续运行，是一个沼气提纯站高效可用的标准。快速响应时间非常必要，因此由技术供应商提供良好网络服务至关重要。此外，还可以采用远程监控，当操作被中断，技术人员可以直接发现故障，根据故障类型立即采取必要的补救措施，避免了时间延误，不需要服务技术人员长途跋涉到达现场解决问题。

Short shutdown time, good operation of equipment, normal and continuous operation of equipment under rated load and sufficient raw gas conditions, is an efficient and available standard for biogas purification station. Quick response time is necessary, so it is essential for technology providers to provide good network services. In addition, remote monitoring can also be used. When the operation is interrupted, technicians can find the fault directly, and take necessary remedial measures immediately according to the type of fault, which avoids time delay and does not require service technicians to travel long distances to the scene to solve the problem.

上述几种二氧化碳/甲烷分离方法已经在其他行业应用了几十年，是目前先进的沼气提纯方法。近几年发展趋势是降低能耗、提高回收率和减少甲烷排放，主要有以下措施：降低成品气体压力以减少电耗，降低解吸过程的温度水平（胺洗），开发具有较高选择性的二氧化碳/甲烷膜，推进液化生物甲烷技术和联合处理技术（如膜和低温分离）等。

These methods of carbon dioxide/methane separation have been used in other industries for decades, and are the most advanced methods of biogas purification. In recent years, the development trend is to reduce energy consumption, increase recovery and reduce methane emission. The main measures are as follows: reducing the pressure of finished gas to reduce power consumption, reducing the temperature level of desorption process (amine washing), developing carbon dioxide/methane membrane with high selectivity, promoting liquefied biomethane technology and combined treatment technology (such as membrane and low temperature separation).

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