Corrosion-Resistant GFS Bolted Steel Tanks for Anaerobic Digesters - China Suppliers & Factory Solutions
Description
The core requirement for anaerobic digester tanks is corrosion resistance. Bolted steel tanks made of Glass-Fused-to-Steel are widely used for various storage applications and are the preferred choice for anaerobic digesters. They have a wide range of applications in practical engineering, especially for industrial wastewater (such as food, slaughtering, and pharmaceutical wastewater) and aquaculture sewage with complex composition and strong corrosiveness. Their excellent corrosion resistance and ease of construction are their main advantages.
The Glass Fused to Steel (GFS) tank is a kind of bolted storage tank made from two materials: glass and steel. High-strength TRS (titanium-rich steel) plates and enamels are perfectly fused at high temperatures to form a highly inert inorganic glaze layer. This coating system has excellent anti-corrosion properties and is the best choice for tank.
Material Characteristics of Glass-Fused-to-Steel Tanks
⚙️ Low Carbon, High Strength, High Titanium.
The steel substrate employed in the construction of glass-fused-to-steel tanks is a special high strength enamelled steel with a unique design and superior properties. Its mechanical properties, including yield strength, tensile strength, and elongation, far exceed those of conventional steel sheets.
Features of Glass Fused to Steel Tanks
- ⚡ Fast installation and short construction period
- 🛡️ Excellent anti-corrosion properties
- 🏗️ Low construction environment requirements
- 🌡️ Strong temperature adaptability
- 🔗 Wide range of applications, seamlessly integrated to form assembled reactors
- ✨ Aesthetically pleasing appearance
- 🔄 Flexible for relocation, expansion and recycling
- 🕐 Simple maintenance and service life in excess of 30 years
Specification
| Coating thickness | 250~450 µm |
| PH range | Standard grade 3~11; Special grade 1~14 |
| Coating process | Standard 2 coats 2 fire; 3 coats 3 fire available |
| Hardness | 6.0 Mohs |
| Elasticity | 500 KN/mm |
| Service life | More than 30 years |
Advantage
The requirements for anaerobic digester tanks are essentially comprehensive requirements for safety, corrosion resistance, sealing, and functionality. The corrosion resistance and ease of construction of enameled bolted tanks / GFS bolted tanks are their main advantages for anaerobic reactors.
(GFS tank for CSTR anaerobic digestion system)
🏭 GFS bolted tanks for anaerobic digesters are widely used in various organic waste treatment and energy recovery projects, including but not limited to:
- Municipal sludge anaerobic digestion projects;
- Livestock and poultry breeding sewage treatment (large-scale pig farms, cattle farms, poultry farms);
- Food processing wastewater treatment (starch, dairy, beverage, meat processing plants);
- Biomass anaerobic digestion (crop straw, kitchen waste, agricultural by-products);
- High-concentration organic wastewater treatment in pharmaceutical, papermaking, and chemical industries.
💡 In practical engineering, process selection needs to comprehensively consider the characteristics of raw materials (solid content, suspended solids, biodegradability), processing scale, target product (energy recovery rate), and economics. Anaerobic digesters/reactors can be divided into different processes, including CSTR, UASB, EGSB, IC etc. GFS bolted tanks are suitable for all processes mentioned above and can store biogas produced during the process using a biogas holder.
(Structure Drawing of biogas holder)
(Structure Drawing of biogas holder)
💡 In practical engineering, process selection needs to comprehensively consider the characteristics of raw materials (solid content, suspended solids, biodegradability), processing scale, target product (energy recovery rate), and economics. Anaerobic digesters/reactors can be divided into different processes, including CSTR, UASB, EGSB, IC etc. GFS bolted tanks are suitable for all processes mentioned above and can store biogas produced during the process using a biogas holder.
GFS bolted tank for paper wastewater treatment system — IC reactor:
Size: D9.17 × H24m, Volume: 1,557 m³
Food wastewater treatment project: GFS tanks for UASB reactor with white color
Size: D6.88×H8.4m, D9.17×H6m, D12.22×H6m, D4.58×H12m, D6.11×H6m
Volume: 290 m³; 360 m³; 640 m³; 180 m³; 160 m³ — Total: 1,630 m³
Frequently Asked Questions (FAQ)
❓ What makes Glass-Fused-to-Steel (GFS) tanks ideal for anaerobic digesters?
GFS tanks offer outstanding corrosion resistance thanks to the highly inert inorganic glaze layer formed by fusing glass and high-strength TRS steel at high temperatures. This makes them perfectly suited for the harsh chemical environment inside anaerobic digesters, which often contain aggressive organic acids, hydrogen sulfide, and other corrosive compounds.
❓ What pH range can GFS tanks withstand?
Standard grade GFS tanks can handle a pH range of 3 to 11, while special grade tanks are engineered to withstand extreme conditions from pH 1 to 14, covering virtually all industrial and municipal wastewater treatment scenarios.
❓ How long is the service life of a GFS bolted tank?
GFS bolted tanks are designed for a service life in excess of 30 years. Their durable enamel coating — with a hardness of 6.0 Mohs and elasticity of 500 KN/mm — ensures long-term structural integrity with minimal maintenance requirements.
❓ Which anaerobic digestion processes are compatible with GFS tanks?
GFS bolted tanks are compatible with all major anaerobic digestion process types, including CSTR (Continuously Stirred Tank Reactor), UASB (Upflow Anaerobic Sludge Blanket), EGSB (Expanded Granular Sludge Bed), and IC (Internal Circulation) reactors. They can also be used as biogas holders to store the biogas generated during digestion.
❓ What types of wastewater are GFS anaerobic digester tanks suitable for?
GFS tanks are suitable for a wide range of wastewater types, including municipal sludge, livestock and poultry breeding sewage, food processing wastewater (starch, dairy, beverage, meat), biomass sources (crop straw, kitchen waste), and high-concentration organic wastewater from pharmaceutical, papermaking, and chemical industries.
❓ Can GFS tanks be relocated or expanded after installation?
Yes. One of the key advantages of GFS bolted tanks is their flexibility. Because they are assembled from bolted panels, they can be disassembled, relocated, expanded, or reconfigured with relative ease compared to traditional concrete or welded steel tanks, making them a cost-effective long-term investment.