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The PSA unit is the final gas separation device used to remove CO2 from gases and increase the bio-methane content, in order to meet customers’ requirements regarding product parameters. Pressure is the driving force that promotes the separation of methane from impurities. The core of PSA technology lies in utilizing the difference in the selective adsorption capabilities of adsorbents for various gas components. Its working process is based on a key principle: pressure-assisted adsorption. At higher pressures, the surface of adsorbents such as activated carbon, molecular sieves, and silica gel has a strong adsorption capacity for CO2, while methane (CH4), due to its weaker adsorption properties, can pass through the adsorption bed and be output as product gas. Pressure-reduced regeneration: When the pressure is reduced, the adsorbed CO2 desorbs (is released) from the surface of the adsorbent. The adsorbent is regenerated, restoring its adsorption capacity. Thereby achieving efficient separation of CH4 and CO2. The PSA unit is installed downstream of the compression unit, and it uses a PSA system equipped with start-up slide valves. To enable continuous production, the PSA system typically consists of multiple adsorption towers connected in parallel; through precise valve control, these towers sequentially carry out the following core steps in a predetermined sequence: adsorption – pressure equalization – desorption – vacuum pumping – pressure equalization again – final pressure increase. After going through this process, an adsorption tower completes one full cycle of \"adsorption-regeneration\", preparing it for the next round of adsorption. By alternately performing the above adsorption and regeneration operations on the adsorption towers (with one adsorption tower always in the adsorption state and another in a vacuum state), continuous separation and purification of gases can be achieved. This device features flexible process operation; under computer program control, it can perform the task of removing one tower or removing towers in groups. Thus, the reliability of the device’s operation is improved. Advantages of the PSA process: 1. One-key start/stop control; 2. Integrated skid-mounted design; 3. Small footprint; 4. Long service life of the adsorbent; 5. Mature and reliable process technology; 6. High methane content in the purified product gas. Tangshan Lvyuan Environmental Protection provides professional PSA purification solutions for biogas. Highly efficient and stable, it produces high-purity biomethane, enhancing the value of the project. Work together with GreenSource to develop clean energy and promote sustainable development!