The present invention is a biogas processing system having a compressor having a biogas input and output, a pump having a water input and output, a scrubber tower having a mixing chamber connected to a biogas input, a water pump input, a water output, and a processed biogas output, and a filtration
The present invention is a biogas processing system having a compressor having a biogas input and output, a pump having a water input and output, a scrubber tower having a mixing chamber connected to a biogas input, a water pump input, a water output, and a processed biogas output, and a filtration member connected to the water output to remove contaminants from the water exiting the first scrubber tower. The system also includes devices for heating and cooling the recycled flow of water to enhance the ability of the water to absorb contaminants from the biogas and the ability of a stripper to remove absorbed contaminants from the water in a closed loop water system, and a controller for closely controlling the operating parameters of the system to achieve safe and optimal operation of the system.
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1. A biogas system comprising: a) a first compressor having a biogas input and a compressed biogas output;b) a first pump having a water pump input and a water pump output;c) a first scrubber tower having a first mixing chamber, a first compressed gas input, a first water input connectable to the wa
1. A biogas system comprising: a) a first compressor having a biogas input and a compressed biogas output;b) a first pump having a water pump input and a water pump output;c) a first scrubber tower having a first mixing chamber, a first compressed gas input, a first water input connectable to the water pump output of the first pump, a first water output, and a first processed gas output, the first mixing chamber in communication with the first compressed gas input, the first processed gas output, the first water input and the first water output; andd) a water filtration member operably connected to the first water output, the filtration member configured to remove contaminants from the water exiting the first scrubber tower wherein the water filtration member is configured to remove oxygen from the water entering the water input of the first scrubber tower. 2. A biogas processing system comprising: a) a first compressor having a biogas input and a compressed biogas output;b) a first pump having a water pump input and a water pump output;c) a first scrubber tower having a first mixing chamber, a first compressed gas input, a first water input connectable to the water pump output of the first pump, a first water output, and a first processed gas output, the first mixing chamber in communication with the first compressed gas input, the first processed gas output, the first water input and the first water output; andd) a water filtration member operably connected to the first water output, the filtration member configured to remove contaminants from the water exiting the first scrubber tower wherein the water filtration member is a membrane contactor. 3. The biogas processing system of claim 2 further comprising a hydrogen sulfide removal device operably connected to the biogas input of the first compressor. 4. The biogas processing system of claim 2 further comprising a moisture separator device operably connected to the biogas input of the first compressor. 5. The biogas processing system of claim 2, further comprising a cooling device operably connected to and upstream of the first water input. 6. The biogas processing system of claim 2 further comprising a controller operably connected to the first compressor, the first pump, the first scrubber tower, and the water filtration member, the controller configured to adjust the operating parameters of at least one of the first compressor, the first pump, and the first scrubber tower in response to changes in a biogas flow connected to the biogas input of the first compressor. 7. The biogas processing system of claim 6 wherein the controller is configured to adjust the operating parameters of the first pump in response to changes in a flow of water through the first pump. 8. The biogas processing system of claim 7 wherein the change in the flow of water through the first pump occurs during start up of the biogas processing system. 9. The biogas processing system of claim 2 wherein water flowing through the first pump, first scrubber tower and water filtration member is maintained at a temperature of below 140° F. 10. A biogas processing system comprising: a) a first compressor having a biogas input and a compressed biogas output;b) a first pump having a water pump input and a water pump output;c) a first scrubber tower having a first mixing chamber, a first compressed gas input, a first water input connectable to the water pump output of the first pump, a first water output, and a first processed gas output, the first mixing chamber in communication with the first compressed gas input, the first processed gas output, the first water input and the first water output; andd) a water filtration member operably connected to the first water output, the filtration member configured to remove contaminants from the water exiting the first scrubber tower wherein the water filtration member is configured to remove nitrogen from the water entering the water input of the first scrubber tower. 11. A method of processing a biogas, the method comprising: a) providing a biogas processing system comprising a first compressor having a biogas input and a compressed biogas output, a first pump having a water pump input and a water pump output, a first scrubber tower having a mixing chamber, a compressed gas input, a water input connectable to the water pump output of the first pump, a water output, and a processed gas output, the mixing chamber in communication with the compressed gas input, the processed gas output, the water input and the water output, and a water filtration member operably connected to the water output of the first scrubber tower, the filtration member configured to remove contaminants from the water exiting the first scrubber tower, wherein the water filtration member is a membrane contactor;b) directing a flow of water from the first pump through the filtration member to filter the flow of water;c) directing a flow of biogas from the first compressor into the compressed gas input of the first scrubber tower;d) directing the flow of water from the filtration member into the water input of the first scrubber tower to contact the flow of biogas; ande) directing the flow of water from the water output of the first scrubber tower to the first pump. 12. The method of claim 11 wherein the biogas processing system further comprises a cooling device operably connected to and upstream of the water input of the first scrubber tower, the method further comprising the step of directing the flow of water through the cooling device prior to directing the flow of water to the filtration member from the first pump. 13. The method of claim 11 wherein the steps of directing a flow of water from the first pump through the filtration member to filter the flow of water, directing the flow of water from the filtration member device into the water input of the first scrubber tower to contact the flow of biogas and directing the flow of water from the water output of the first scrubber tower to the first pump are performed within a closed loop water recirculation system. 14. The method of claim 11 wherein the biogas processing system further comprising a controller operably connected to at least one of the first compressor, the first pump, the first scrubber tower, and the water filtration member, the controller configured to adjust the operating parameters of at least one of the first compressor, the first pump, and the first scrubber tower in response to changes in a biogas flow connected to the biogas input of the first compressor, and wherein the method further comprises the step of adjusting the operating parameters of at least one of the first compressor, the first pump, and the first scrubber tower in response to changes in a biogas flow connected to the biogas input of the first compressor prior to directing a flow of water from the first pump through the filtration member to filter the flow of water. 15. The method of claim 14 wherein the step of adjusting the operating parameters comprises adjusting the operating parameters of the first pump in response to changes in a flow of water through the first pump. 16. The method of claim 15 wherein the step of adjusting the operating parameters of the first pump comprises adjusting the flow of water through the first pump during start up of the biogas processing system. 17. The method of claim 12 wherein the step of directing the flow of water through the cooling device cools the flow of water to a temperature of below 140° F. 18. A method of processing a biogas, the method comprising: a) providing a biogas processing system comprising a first compressor having a biogas input and a compressed biogas output, a first pump having a water pump input and a water pump output, a first scrubber tower having a mixing chamber, a compressed gas input, a water input connectable to the water pump output of the first pump, a water output, and a processed gas output, the mixing chamber in communication with the compressed gas input, the processed gas output, the water input and the water output, and a water filtration member operably connected to the water output of the first scrubber tower, the filtration member configured to remove contaminants from the water exiting the first scrubber tower;b) directing a flow of water from the first pump through the filtration member to filter the flow of water;c) directing a flow of biogas from the first compressor into the compressed gas input of the first scrubber tower;d) directing the flow of water from the filtration member into the water input of the first scrubber tower to contact the flow of biogas; ande) directing the flow of water from the water output of the first scrubber tower to the first pump wherein the filtration member is configured to remove oxygen, and wherein the step of directing the flow of water through the filtration member to filter the flow of water comprises filtering dissolved oxygen from the flow of water.
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