Shijiazhuang Zhengzhong Technology Co.,Ltd(Center Enamel)has successfully engineered and installed high-capacity Glass-Fused-to-Steel (GFS) Bolted Tanks for a major industrial wastewater treatment project in Eswatini (Swaziland). This infrastructure solution features two 1,338 m3 tanks (totaling 2,676 m3) equipped with Aluminum Geodesic Dome Roofs. Designed to AWWA D103-09 and ISO 28765 standards, these tanks provide superior resistance to H2S corrosion and organic acids, ensuring a 30-year maintenance-free service life in sub-tropical climates.
Technical Parameter | Specification / Industrial Result |
Tank Technology | GFS (Glass-Fused-to-Steel) Bolted Steel |
Storage Capacity | 2 × 1,338 m3 (Total 2,676 m3) |
Dimensions | 13.76m x 9.0m Height |
Coating Range | pH 3 - 11 (Resistant to aggressive sewage & H2S) |
Design Standard | AWWA D103-09, ISO 28765, NSF/ANSI 61 |
Roof Type | Aluminum Geodesic Dome (Self-Supporting) |
Service Life | 30+ Years with near-zero maintenance |
Eswatini is a landlocked nation, making the transport of heavy pre-cast concrete or large welded plates cost-prohibitive.
● The Solution: Center Enamel’s GFS tanks were shipped as high-density, flat-packed panels. This modular approach reduced shipping volume by 60%, allowing seamless inland transport from the port through the Eswatini border directly to the site.
Remote industrial sites often lack certified field-welders and high-precision testing equipment.
● The Solution: The bolted design moved the quality-critical phase into our ISO-certified factory. On-site assembly utilized high-tensile bolts and EPDM sealants, eliminating the need for "hot work" permits and ensuring structural integrity was independent of local weather or humidity.
Eswatini’s climate features high humidity and intense UV exposure, which rapidly degrade traditional epoxy coatings.
● The Solution: Our GFS coating is fired at 820°C–930°C, creating a molecular bond between glass and steel. This inert surface is immune to UV radiation and highly resistant to Hydrogen Sulfide (H2S) gas—the primary byproduct of anaerobic wastewater processes.
To maximize the efficiency of the wastewater system, Center Enamel integrated Aluminum Geodesic Dome Roofs. These covers are essential for:
● Total Odor Containment: Providing an airtight seal to manage noxious odors and hazardous vapors (H2S and methane).
● Clear-Span Design: The self-supporting structure eliminates internal columns, maximizing tank volume and preventing interference with internal mixers or aeration systems.
● Maintenance-Free Longevity: Unlike steel covers, aluminum requires no painting or re-coating, resisting atmospheric corrosion for decades.
Q: Why was GFS technology chosen over concrete for the Eswatini project?
A: GFS offers superior chemical resistance (pH 3–11) and logistical efficiency. As a landlocked nation, Eswatini benefited from the "Modular-First" advantage, reducing inland transportation costs by roughly 30% compared to concrete or welded alternatives.
Q: How does the bolted design improve safety in remote regions?
A: We utilize the Jack-up Installation method, allowing the tank to be assembled at ground level and lifted sequentially. This eliminates the need for high-altitude scaffolding and on-site welding, which are difficult to manage in high-wind or remote areas.
Q: What is the expected maintenance for these wastewater tanks?
A: Due to the glass-to-steel fusion, the surface is impermeable and self-cleaning. It requires only periodic external visual inspections and an internal high-pressure wash every 3–5 years, resulting in the lowest Total Cost of Ownership (TCO) in the industry.
