China H2s Sulfur Removal by Biological Method with Low Operation Cost

Biological desulfurization (BDS) is a process in which a sulfur-containing compound (H2S, organic sulfur) is catalyzed by microorganisms or enzymes contained therein to convert it into elemental sulfur (S) and a trace amount of SO4²¯. With this biological desulfurization process, the efficiency can be higher than 99.5%.
Technically it belongs to separate biological desulfurization process, as it does not introduce exogenous gases such as air, oxygen into reaction, and the calorific value of biogas remains unchanged. It can be used for removal of H2S in biogas, natural gas and industrial waste gas generated by anaerobic digestion of domestic garbage, livestock manure, kitchen waste and organic sewage. The desulfurization product is a high-purity elemental sulfur (S), which can be used for industrial production.
Working principles:
The biological desulfurization process can be divided into three units: 1) absorption tower, 2) biological regeneration reactor for washing liquid, and 3) elemental sulfur separator.
As shown in flow chart below, the alkaline biological washing liquid is sprayed from the top of the washing tower and it will countercurrently contact with the sulfur-containing compound (primary H2S) source, which is entered from the bottom of washing tower. During this process, the H2S will be efficiently absorbed. Then the rich liquid containing sulfide flows from the bottom of the washing tower into the biological regeneration reactor. Through the treatments of microorganisms, the alkaline biological washing liquid will be regenerated in the biological regeneration reactor. As for elemental sulfur, it can be recovered through the elemental sulfur separator, by means of particle precipitation.
Absorption Tower: H2S+OH- = HS-+H2O
Biological Regeneration Reactor: microorganisms as catalyst, HS-+1/2O2 → S+OH-
Advantages:
High desulfurization efficiency 99.5%
Low working cost, low maintenance cost
No pollution with elemental sulfur
Stable performance, easy to control
Small land required
Suitable for large-scale, high sulfur-containing gas (100ppm~20000ppm)

ComparisonDry DesulfurizationWet DesulfurizationBiological DesulphurizationApplicationSmall and medium projects with gas less than 5000m³/day; Second high precision desulfurization after other methodsLarge Gas Plant up to 100,000 m^3/ day; High sulfur content around 5g/Nm³Large-scale, high sulfur-containing gas (100ppm~20000ppm)Power ConsumptionNoneHighModerateOperating CostModerate, the desulfurizer need to be changed periodicallyModerateLow cost on electricity billLand ScaleSmallFull set of equipment for gas desulfurization, regeneration, filtration and melting sulfur, in result, large land is required.ModerateOperation ManagementEasy to manage, reliable operation, dispense with staff on dutyNeed people on duty to control the operationAutomatic operation, simple maintenanceNoteRefueling at fixed period, one use one reserve, alternate operationMany equipment AdvantagesSimple structure, low investment, long lifetime, high precision of desulfurization (lower than 15ppm)

It can deal with large amount gas, and the system can run continuously by using PH value to keep the efficiency.

High desulfurization efficiency 99.5%, no second pollution, stable performance, suitable for large-scale, high sulfur-containing gas

Management System Certification: ISO9001:2008, ISO14001:2004, OHSAS18001:2007
Company Introduction:
Shandong Mingshuo New Energy Technology Co., Ltd. Specializes in biogas project. The company is the production base of medium and large biogas equipments in China, the member of China Biogas Association, the member of China Association of Rural Energy Industry. The company is the recommended member of CCTV Website Enterprise Channel and China import and Export Commodity Website, the most complete and excellent biogas equipments manufacturers in China. Mingshuo is a professional company integrating the scientific research, technological design, production and debugging service. The company specializes in the production of desulfurizer, desulfurization equipments and biogas equipments. Such as, Mingshuo MTZ biogas dedicated desulfurizer, MT ferric oxide desulfurizer, 889 wet desulfurization catalysts, water treatment agent, MS biogas dedicated desulfurization tanks, thioniers, biogas dedicated gas-water separators, assembled tanks, gas holders, positive-negative pressure protectors, biogas dedicated flame arresters, biogas boilers, deironing magnetic separation equipments, etc.
Contact: Emma Luan