Process and biofilter system for H2S removal from a H2S contaminated energy production gas stream containing methane and use of such a biofilter system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61L-009/01
C10L-003/10
출원번호
US-0916614
(2014-09-18)
등록번호
US-9890343
(2018-02-13)
우선권정보
NO-20131255 (2013-09-18)
국제출원번호
PCT/EP2014/069866
(2014-09-18)
국제공개번호
WO2015/040100
(2015-03-26)
발명자
/ 주소
Ettl, Marina
Franke, Wolfram
Van Borm, Werner
출원인 / 주소
YARA INTERNATIONAL ASA
대리인 / 주소
Amster, Rothstein & Ebenstein LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
The invention relates to a process and a biofilter system (10) for removing H2S from a H2S contaminated energy production gas stream containing methane. The aqueous biofilter system comprises a biofilter (6) having biofilter support material constituting a biofilter bed supporting a humidified biofi
The invention relates to a process and a biofilter system (10) for removing H2S from a H2S contaminated energy production gas stream containing methane. The aqueous biofilter system comprises a biofilter (6) having biofilter support material constituting a biofilter bed supporting a humidified biofilm having microorganisms that are capable of oxidizing H2S. The process comprises the steps of contacting the H2S contaminated energy production gas stream with the microorganisms of the humidified biofilm, and oxidation of at least part of the H2S in the H2S contaminated energy production gas stream by the microorganisms, resulting in a H2S depleted energy production gas stream, wherein the process further comprises the step of adding an aqueous nitrate solution to the H2S contaminated energy production gas stream prior to being contacted with the microorganisms, enabling the microorganisms to oxidize the H2S under anoxic conditions. The invention furthermore relates to the use of such a biofilter system (10) in the removal of H2S from a H2S contaminated energy production gas stream containing methane.
대표청구항▼
1. Process for removing H2S from a H2S contaminated energy production gas stream containing methane, using an aqueous biofilter system (10) comprising a biofilter (6) having biofilter support material constituting a biofilter bed supporting a humidified biofilm having microorganisms that are capable
1. Process for removing H2S from a H2S contaminated energy production gas stream containing methane, using an aqueous biofilter system (10) comprising a biofilter (6) having biofilter support material constituting a biofilter bed supporting a humidified biofilm having microorganisms that are capable of oxidizing H2S, wherein the process comprises the steps of adding an aqueous nitrate solution to the H2S contaminated energy production gas stream, prior to being contacted with the microorganisms;contacting the H2S contaminated energy production gas stream including the aqueous nitrate solution with the microorganisms of the humidified biofilm, enabling the microorganisms to oxidize the H2S under anoxic conditions; andoxidation of at least part of the H2S in the H2S contaminated energy production gas stream by the microorganisms, using the aqueous nitrate solution added to the H2S contaminated energy production gas stream, prior to being contacted with the microorganisms, resulting in a H2S depleted energy production gas stream. 2. A process according to claim 1, wherein the nitrate solution comprises a chelating agent that is adapted to prevent clogging of inert precipitating agents and other substances formed through the anoxic oxidation of the H2S by the microorganisms. 3. A process according to claim 2, wherein for prevention of clogging of calcium sulphate precipitation, the chelating agent comprises ethylene diamine tetra acetic acid (EDTA). 4. A process according to claim 1, wherein the nitrate solution comprises a calcium nitrate solution to enable the microorganisms to oxidize the H2S under anoxic conditions. 5. A process according to claim 1, wherein the process comprises the step of recirculating part of the H2S depleted energy gas stream to the biofilter and adding to the recirculated energy production gas stream a nutrient solution prior to being contacted with the microorganisms of the biofilm. 6. A process according to claim 5, wherein the process comprises the step of automatically adjusting the dosage of the nutrient solution added to the H2S contaminated energy production gas stream in relation to the H2S content in the H2S contaminated energy production gas stream at an inlet of the biofilter system (10). 7. A process according to claim 5, wherein the process comprises the step of adding the nitrate solution to the part of the recirculated H2S depleted energy production gas stream prior to being contacted with the microorganisms of the biofilm. 8. A process according to claim 1, wherein the biofilm is humidified using the H2S contaminated energy production gas stream which has been pre-humidified before contacting the biofilm. 9. A process according to claim 1, wherein the aqueous nitrate solution and/or a nutrient solution is added to the H2S contaminated energy production gas stream (1) using an atomizer nozzle to atomize the aqueous nitrate and/or the nutrient solution. 10. A process according to claim 8, wherein the H2S contaminated energy production gas stream has been pre-humidified before contacting the biofilm by atomizing the aqueous nitrate solution and/or a nutrient solution into said H2S contaminated energy production gas stream, thus generating a H2S contaminated energy production gas stream including an aqueous nitrate solution and/or a nutrient solution as fine droplets. 11. Aqueous biofilter system (10) arranged to remove H2S from an energy production gas stream containing methane, the aqueous biofilter system (10) comprising a biofilter (6) having biofilter support material constituting a biofilter bed and supporting a biofilm having microorganisms capable of oxidizing H2S, the biofilm being arranged to be contacted with the H2S contaminated energy production gas stream (1) including an aqueous nitrate solution and the microorganisms being arranged to remove at least part of the H2S out of the H2S contaminated energy production gas stream (1), resulting in a H2S depleted energy production gas stream (2), wherein the aqueous biofilter system (10) comprises means (4, 8) for adding an aqueous nitrate solution to the H2S contaminated energy production gas stream (9) before being contacted with the biofilm, enabling the microorganisms to oxidize the H2S under anoxic conditions. 12. Aqueous biofilter system (10) according to claim 11, wherein the means (8) for adding an aqueous nutrient solution to the H2S contaminated energy production gas stream (1) comprise an atomizer nozzle adapted to atomize the nutrient solution into the H2S contaminated energy production gas stream. 13. Aqueous biofilter system (10) according to claim 11, wherein the biofilter system (10) comprises a controller (3) that is arranged to measure the H2S content in the H2S contaminated energy production gas stream (1) present in the operational state of the biofilter system (10) at the inlet of the biofilter (6),calculate the nutritional demand for the microorganisms, andadjust the nutritional dosage ratio of a carbon source, a nitrogen source and a phosphor source of the nutrient solution equalling to 100:10:1. 14. Aqueous biofilter system (10) according to claim 11, wherein the controller (3) is arranged to adapt simultaneously the dosage of the nitrogen and the phosphor source in the nutrient solution. 15. Aqueous biofilter system (10) according to claim 11, wherein the controller (3) is arranged to adapt the dosage of the nitrogen and the phosphor source in the nutrient solution separately.
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