Bio-scrubber for biogas desulphurisation 450 m³/h – H₂S 2,500 to 150 ppm
€ 122.000,00
Biological desulphurisation using a conventional biotrickling scrubber is a proven technology that has been successfully used for many years to remove hydrogen sulphide (H₂S) from biogas, sewage gas and landfill gas. The process is also known as microbial desulphurisation. Other names are scrubber, bioscrubber, bio-scrubber, bio-trickling scrubber, bio-trickling reactor, bio-bed reactor.
The H2S hydrogen sulphide-containing biogas is passed through a vessel filled with packing material. Microorganisms colonise the surface of the packing material and, in the presence of oxygen, oxidise hydrogen sulphide into elemental sulphur and sulphate.
By adding nutrients for the microorganisms and continuously circulating water, sulphur and sulphate are washed out of the system. The resulting sulphur- and sulphate-containing suspension can be discharged to the inlet of a wastewater treatment plant or, in the case of biogas plants, to the digestate storage tank.
Microorganisms of the Thiobacillus (Thiooxidans) type are used. These bacteria are chemolithotrophic and use carbon dioxide as their carbon source. They require oxygen for their metabolism, which is supplied in the form of air.
The air supply is regulated according to the biogas flow rate. For this purpose, a 4–20 mA signal from the biogas flow measurement is required. Process air is supplied by a blower whose capacity is controlled by a frequency converter.
The vessels are made of PP (polypropylene). Heating of the system is not required. Due to the low pH value of the suspension, all process piping in contact with the medium is made of PVC or PP.
The control cabinet and the complete process equipment are installed in a technical room made of PP. A separate ATEX safety shutdown system is installed outside the technical room.
A major advantage of biological desulphurisation compared with other processes, such as activated carbon filters or chemical scrubbers, is that no additional chemicals are required for H₂S removal. Only small quantities of nutrients for the microorganisms need to be added.
The system achieves an H₂S removal efficiency of 94%, reducing the H₂S concentration from 2,500 ppm to as low as 150 ppm.
Technical Details
Features
Standard scope of supply
Flow rate, actual m³/h:
450
Flow rate, Nm³/h:
410
H₂S inlet concentration
2,500 ppm
H₂S outlet concentration
≤150 ppm
H₂S mass load
1.69 kg/h
Pressure drop
5–8 mbar
Minimum inlet pressure, mbar
3
Operating pressure, mbar
40
Gas connection DN, mm:
200
Volume and umber of scrubbers
1 x 53 m3
Diameter and Height, mm:
2600 x 10000
Volume of filling material, m3
45
Water use, max l/h
170-190
Water connection
DN25
Nutrient consumption, kg per day
2,8 kg
Electrric power demand, kW
12
Average consumption, kWh/h
8
Process air addition,
11–14% of raw biogas flow
Air blower flow and pressure
20–80 m³/h at 80 mbar
Heating capacity/ connection / length of coils
45 kW / DN40/ 400 m
Technical Details
Flow rate, actual m³/h:
450
Flow rate, Nm³/h:
410
H₂S inlet concentration
2,500 ppm
H₂S outlet concentration
≤150 ppm
H₂S mass load
1.69 kg/h
Pressure drop
5–8 mbar
Minimum inlet pressure, mbar
3
Operating pressure, mbar
40
Gas connection DN, mm:
200
Volume and umber of scrubbers
1 x 53 m3
Diameter and Height, mm:
2600 x 10000
Volume of filling material, m3
45
Water use, max l/h
170-190
Water connection
DN25
Nutrient consumption, kg per day
2,8 kg
Electrric power demand, kW
12
Average consumption, kWh/h
8
Process air addition,
11–14% of raw biogas flow
Air blower flow and pressure
20–80 m³/h at 80 mbar
Heating capacity/ connection / length of coils
45 kW / DN40/ 400 m