Can Enamel Tanks Be Used in Extremely Cold Regions? --- Türkiye's Food Waste Treatment Project
Türkiye's food waste treatment project -- GFS tanks remained crack-free for three consecutive years at -15°C, with a stable fermentation efficiency of over 85%. This is an extremely successful engineering application case, perfectly demonstrating the technical superiority and reliability of enamel-lined assembled tanks in harsh environments.
This is not just a simple matter of "not being damaged by freezing"; it reflects a high level of expertise in materials science, process design, and system integration.
Food waste involves a complex fermentation medium with high corrosiveness and the presence of sulfides and other corrosive components. Furthermore, it is kept at a low temperature of -15°C for extended periods, posing a severe challenge to any wastewater treatment or anaerobic digester. Traditional materials (such as concrete) are prone to freeze-thaw cycles due to the expansion of internal water, and steel may experience a decrease in toughness at low temperatures.
Not only must the structure be “unbreakable”, but it must also be highly efficient (fermentation efficiency 85%+). This is like asking someone to not only avoid getting sick in freezing weather, but also to maintain high-intensity physical exercise and deliver consistent results.
Structural success (no freezing cracks): This demonstrates that the overall design and materials of the enamel tank system (including the tank body, seals, and insulation) can withstand the enormous stresses caused by drastic temperature changes and the freezing expansion of the internal medium.
Functional success (stable efficiency of 85%+): This is even more crucial. It demonstrates the effectiveness of the tank insulation system and the rationality of the process design, providing a stable and efficient metabolic environment for the anaerobic microbial community. Even under frigid external conditions, the core fermentation temperature inside the tank (typically around 35-38°C in the mesophilic range or around 55°C in the hyperthermic range) can be maintained.
How to achieve efficient fermentation in icy and snowy conditions?
1. Core Advantages of Enameled Steel Plates:
Excellent Temperature Resistance:The high-quality enamel coating and the steel plate have scientifically matched coefficients of thermal expansion, allowing them to withstand significant temperature changes without peeling or cracking.
Superior Corrosion Resistance: Completely resists corrosion from organic acids, hydrogen sulfide, ammonia nitrogen, and other substances produced during the fermentation of kitchen waste, ensuring that the main structure of the tank does not weaken under long-term corrosive conditions. This is the foundation for long-term stability.
2.Key Supporting Systems (Each is Essential):
High-Efficiency Insulation System:This is the core of functional success. The outer wall of the tank must employ a high-performance insulation layer (such as polyurethane foam, rock wool, etc.) and a moisture-proof vapor barrier layer, and be professionally installed to ensure the insulation layer is continuous and free of thermal bridges. This greatly reduces heat loss and lowers heating energy consumption.
Auxiliary heating system: In an environment of -15°C, insulation alone cannot maintain the fermentation temperature. The tank must integrate a highly efficient internal heating coil or external heat exchange circulation system, utilizing a biogas boiler or external heat source to precisely control the temperature of the fermentation materials.
3.Scientific process design and operation management
Feed stability: Pre-treatment of food waste (sorting, pulping, conditioning) is a prerequisite for ensuring efficient subsequent fermentation.
Tank Design and Water Distribution/Agitation: A reasonable tank height-to-diameter ratio, an efficient water distribution system, and appropriate agitation ensure uniform distribution of materials, temperature, and microorganisms, avoiding localized low temperatures or short circuits.
The Turkey project serves as a successful example of breaking the climate taboo: it successfully extended highly efficient anaerobic fermentation technology to high-altitude and cold regions, providing a proven and reliable solution for the resource utilization of organic waste in cold regions worldwide.