Center Enamel: A Globally Leading One-Stop Provider of Environmental Equipment & Engineering Solutions

Against the backdrop of accelerating transformation in the global environmental protection industry and the growing urgency for sustainable development, the quality and efficiency of storage tanks and environmental engineering equipment have become critical factors determining project success. Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), as a global leader in the Glass-Fused-to-Steel tank industry, is committed to providing one-stop environmental protection solutions across municipal wastewater, food waste, livestock wastewater, industrial effluent, and drinking water sectors.

From in-house R&D and manufacturing of core equipment, to undertaking anaerobic process sections and EPC turnkey projects, Center Enamel leverages international certifications, a full-chain service system, and extensive global project experience to continuously empower environmental infrastructure development. Today, the company's products are exported to over 100 countries, with annual sales firmly ranked among the world's top tier, earning the trust of customers worldwide through the tangible strength of "Intelligent Manufacturing in China."

1. Company Positioning & Business Overview: What Do We Do?

Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) is a comprehensive high-tech enterprise whose core businesses include the R&D, manufacturing, and sales of diversified equipment such as Glass-Fused-to-Steel (GFS) tanks, Fusion Bonded Epoxy (FBE) tanks, and aluminum dome roofs, as well as undertaking environmental EPC projects and anaerobic process sections. The company's business covers food waste, landfill leachate, municipal wastewater, biogas projects, livestock farming, industrial wastewater, petrochemicals, and metallurgy. We provide clients with professional full-scope services, including engineering design, equipment R&D and manufacturing, installation and commissioning, and construction.

2. Core Product Portfolio of Center Enamel

Starting with a focus on the R&D and production of GFS tanks, Center Enamel has expanded its offering to include storage tanks, roof covers, pressure vessels, and engineering equipment, forming a diversified and comprehensive equipment manufacturing system.

2.1 Glass-Fused-to-Steel (GFS) Tanks

GFS tanks are assembled on-site using specially engineered steel panels, stiffeners, self-locking bolts, and sealants. The steel substrate is a titanium-bearing hot-rolled sheet developed in cooperation with top domestic steelmakers, and the tanks are formed using fast, low-energy on-site assembly techniques. After being fired at 820°C–930°C, the enamel fuses with the steel surface to form a robust, chemically inert inorganic coating that offers exceptional corrosion resistance. The glass-fused-to-steel process is currently one of the most advanced coating technologies in the steel tank market.

2.2 Fusion Bonded Epoxy (FBE) Tanks

As one of the first Chinese enterprises to possess an FBE tank production line, Center Enamel enables intelligent, standardized manufacturing of FBE tanks. These tanks offer a cost-effective storage solution with rapid fabrication and installation. The steel panels undergo abrasive blasting, powder coating, and baking to form a coating with strong adhesion and superior corrosion resistance, making them ideal for drinking water, fire-fighting water, wastewater treatment, biogas, and dry bulk storage applications.

2.3 Aluminum Geodesic Dome Roof

The aluminum geodesic dome roof is a self-supporting roof cover independently developed by Center Enamel, assembled from high-strength aluminum alloy materials and fully compliant with AWWA D108 and API 650 standards. It features expansive clear span capability, all-aluminum construction, light weight, advanced corrosion resistance, efficient and cost-effective construction, minimal maintenance costs, and an attractive appearance. It is an excellent roof solution for drinking water, wastewater, petrochemical, dry bulk, and construction applications.

Panel Design: The unique structural design of the roof beams protects silicone gaskets from UV exposure and aging, ensuring sealing performance and enhancing structural strength.

Joint Design: Proprietary extruded profiles and spin-formed aluminum cover plates are used for waterproof sealing.

2.4 Other Auxiliary Equipment

Center Enamel has built a comprehensive product matrix covering three major categories: tank systems, roof systems, and pressure vessels. Tank systems feature GFS tanks and FBE tanks as core products, with additional options including stainless steel tanks, galvanized steel tanks, carbon steel tanks, and welded tanks. Roof systems include Glass-Fused-to-Steel roofs, aluminum alloy trough deck roof, FRP roofs, and stainless steel roofs, with Single and Double Membrane Roof options. The company also manufactures a full range of pressure vessels for separation, heat exchange, reaction, and storage applications.

3. Core Competitiveness: What Are Our Strengths?

3.1 High-Quality Products

Our GFS tanks utilize proprietary hot-rolled double-sided enameling technology, combined with over 200 enamel formulations, delivering strong corrosion resistance and a service life exceeding 30 years. The modular bolted structure enables factory prefabrication and rapid on-site assembly, shortening construction time and facilitating future expansion or relocation. The products are widely adaptable to municipal, biogas, fire-fighting, and other applications, with multiple international certifications. Customized structural designs account for local environmental factors such as snow loads, wind speeds, and seismic conditions to ensure long-term safety and reliability.

3.2 R&D and Innovation Strength

Center Enamel has established a multi-tiered R&D team comprising doctoral scholars, professor-level senior engineers, and external experts. We operate joint laboratories with Donghua University and Hebei University of Science and Technology, forming a robust industry-academia-research collaborative platform. As the pioneer of hot-rolled double-sided enameling technology in China, the company independently develops and produces enamel formulations, with over 200 recipes and a single-tank capacity exceeding 50,000 m³. Our antibacterial enamel technology for drinking water has been included in the Ministry of Water Resources' key promotion catalog, and our products are exported to over 100 countries.

3.3 Extensive Project Experience

With headquarters in Shijiazhuang, Center Enamel has built a globally efficient project execution system and after-sales service network. Our team can support the installation of more than 10 international projects simultaneously on any given day, covering regions including Dubai, Peru, Malaysia, Singapore, Costa Rica, Turkey, Guyana, Mexico, Saudi Arabia, and over 100 other countries.

3.4 Systematic Service Teams

Headquartered in Shijiazhuang, our global service system covers the entire value chain: R&D, design, marketing, installation, and after-sales. The R&D team is led by national-level technical experts and employs multiple senior engineers. Our design team applies cutting-edge concepts, with products meeting American and European safety standards. Sales and service networks span six continents; installation teams have completed over 10,000 projects worldwide; and our after-sales team delivers rapid, professional responses to ensure complete customer satisfaction.

3.5 Intelligent Manufacturing Base

The company operates an advanced equipment R&D and manufacturing center equipped with laser cutters, tunnel-type steel panel shot blasting machines, CNC punches, fully automatic spraying and enameling furnaces, and other high-end automated equipment for standardized, modern production lines. Two major production lines—for GFS tanks and FBE tanks—run in parallel, with an annual output of 300,000 steel panels. From raw material inspection, cutting, hole punching, edge grinding, and shot blasting to arc pressing, pre-treatment, and automatic spraying, the entire process is meticulously controlled to ensure high precision and quality.

4. Service System: What Services Can We Provide?

4.1 Site-Adapted Design

Based on local environmental conditions (snow loads, wind speeds, seismic zones, etc.) and specific client requirements, we provide fully customized designs for tank structure, foundation, process, accessories, and roof covers, incorporating specialized anti-wind, anti-seismic, and landslide-prevention measures. All designs strictly follow international standards such as AWWA, EN, AS, and GB to ensure solutions are both practical and safe for long-term operation.

4.2 Comprehensive Consultation Services

Center Enamel offers one-stop consultation services covering project consulting, solution design, equipment manufacturing, installation and commissioning, and operation and maintenance. Our professional team works closely with clients to analyze their needs and local conditions, delivering optimized tank solutions that ensure efficient project execution and long-term operational stability.

4.3 Installation Guidance and After-Sales Support

We provide full-chain professional services from installation to after-sales. Our experienced installation teams have completed over 10,000 projects. For overseas projects, we dispatch guidance teams for on-site training (tank erection, secondary grouting, sealant application, water testing, etc.). We use a reverse lifting method for layer-by-layer assembly and offer various foundation options. Our responsive after-sales team handles fault diagnosis, solution formulation, and on-site repairs, ensuring prompt resolution and an excellent reputation.

5. Why Choose Center Enamel?

5.1 Deep Industry Heritage

As the first Chinese enterprise to independently develop and manufacture GFS tanks, Center Enamel produced the country's first hot-rolled double-sided enamel panel in 2008, filling a domestic gap. Since then, we have continued to lead: in 2009, we were the designated supplier for the Beijing Olympic Games wastewater treatment project; in 2015, we obtained NSF/ANSI 61 certification and entered overseas markets; in 2018, we built Asia's tallest GFS tank (34.8 m); in 2021, we were recognized as a National "Little Giant" Specialized and Sophisticated Enterprise; and in 2023, our new production base came online, and our Italy project set a new world record for single-tank volume (30,549 m³). With over 15 years of technological accumulation and multiple "Asia's First" and "China's First" milestones, Center Enamel is an undisputed leader in the GFS tank industry.

5.2 Internationally Certified Quality

As the first Chinese GFS tank manufacturer to meet American and European design standards, Center Enamel's products strictly comply with AWWA D103 (U.S.), EN-ISO 18765 (Europe), and other international codes, as well as AS, AS/NZS, and other structural, seismic, and wind-load standards. From raw materials to finished products, every step follows the highest international requirements, ensuring safe and stable operation under any harsh environmental conditions worldwide.

5.3 "Product + Process" Integrated Solutions

Leveraging our equipment strengths, Center Enamel has built a comprehensive system covering equipment manufacturing, process contracting, and EPC turnkey services. We supply core equipment such as tanks, dual-membrane gas holders, three-phase separators, and mixers, while also undertaking mainstream anaerobic processes (CSTR, UASB, IC, USR) and offering EPC capabilities (for biogas, livestock, municipal, and industrial wastewater projects). This means clients can rely on a single partner for integrated equipment, process, and engineering delivery, ensuring seamless coordination, better system compatibility, and more efficient project execution.

5.4 Professional Customization Services

Choosing Center Enamel means choosing professional customization:

As the only Chinese GFS tank manufacturer that simultaneously meets U.S., Australian, and other countries' import design standards, we apply top-tier international benchmarks to every project. Taking into account local snow loads, wind speeds, seismic zones, and client-specific needs, we provide full-element customization of tank structure, foundation, process, accessories, and roof covers, with enhanced anti-wind, anti-seismic, and landslide-prevention features. From environmental adaptation to structural optimization, from international codes to tailored solutions, Center Enamel ensures every tank is safe and durable over the long term—truly "designed by need, engineered for the environment."

6. Representative Case Studies

Case 1: Palm Oil Wastewater Treatment Project in Malaysia

This project uses a combined aerobic-anaerobic process to treat high-strength organic wastewater from palm oil production. It features five GFS tanks (5,400 m³ each, total effective volume 27,000 m³). Influent COD is up to 60,000 mg/L and BOD 25,000 mg/L; after treatment, COD drops below 12,000 mg/L and BOD below 5,000 mg/L, achieving an 80% digestion rate. The system generates approximately 22,000 m³ of biogas per day (0.45 m³ biogas per kg COD removed), enabling both compliant discharge and efficient green energy recovery.

Case 2: Palm Oil Wastewater Biogas Project in Indonesia

Located in Indonesia and applied to the anaerobic digestion stage of a palm oil wastewater treatment plant, this project was completed in 2013 with three GFS tanks (dimensions: Ø17.58 m × 8.4 m and Ø16.82 m × 7.2 m), effectively supporting efficient anaerobic treatment and biogas recovery.

7. Center Enamel: A Trustworthy One-Stop Solution Provider

Center Enamel is built on a foundation of internationally recognized certifications and a full-chain quality assurance system covering design, production, and finished products:

Leading Design Standards

As the only Chinese GFS tank manufacturer that meets U.S., Australian, and other countries' import design standards, our products strictly comply with AWWA D103 (U.S.), EN 15282 (Europe), AS/NZS 1170 (Australian seismic and wind-load standards), and GB 50017 (China), ensuring structural safety under various global conditions.

International Certifications Across the Full Process

NSF Certification: Recognized by the World Health Organization for drinking water safety, suitable for municipal water supply and food-grade tank projects.

WRAS Certification: Issued by the UK Water Regulations Advisory Scheme, applicable to drinking water systems in Europe and Commonwealth countries.

CE Marking: Mandatory EU safety mark permitting free circulation in the European market.

ISO 9001:2015: International quality management system ensuring standardized and controlled production processes.

BSCI Certification: Social responsibility audit reflecting our commitment to sustainable development.

Multiple Inspections for Verified Quality

From mill test certificates for steel panels, self-locking bolts, and sealants to finished tank inspections (ISO 28765), combined with third-party spot checks, every tank is rigorously tested to withstand the toughest international standards.

Whether projects are located in Europe, the Americas, Southeast Asia, or Australia, Center Enamel's certification system ensures compliant market access and reliable safety—making us your trusted one-stop solution provider.

Conclusion

Center Enamel is a global leader in the GFS tank industry, with annual sales firmly among the world's top tier (ranked No. 2 globally). We are the only Chinese manufacturer that simultaneously meets U.S. and Australian import design standards. Holding internationally recognized certifications (NSF, WRAS, CE, ISO, etc.), we export to over 100 countries and serve multiple sectors, including municipal wastewater, drinking water, biogas, and industrial wastewater.

With more than 30 years of deep commitment to the GFS tank industry, Center Enamel consistently takes international standards as the cornerstone, customized solutions as the core, and full-chain services as the guarantee, delivering reliable integrated "Equipment—Process—Engineering" solutions to global clients. From Asia's first hot-rolled double-sided enamel tank to world-leading annual sales, Center Enamel continues to empower the global environmental protection cause with the strength of Chinese intelligent manufacturing. Choose Center Enamel—choose globally trusted quality and partnership.

FAQ

Q1: What are the main application areas for Center Enamel's GFS tanks?
A: Center Enamel's GFS tanks are widely used in municipal wastewater, food waste treatment, landfill leachate, livestock wastewater, biogas projects, industrial wastewater, and drinking water storage. Their excellent corrosion resistance and modular, fast-installation advantages make them suitable for various complex working conditions.

Q2: Do Center Enamel's products meet international standards?
A: Yes. Center Enamel is the only Chinese GFS tank manufacturer that simultaneously complies with AWWA D103 (U.S.), EN-ISO 18765 (Europe), and AS/NZS 1170 (Australia) design standards. We also hold NSF, WRAS, CE, ISO, and other certifications, ensuring compliant market access worldwide.

Q3: Does the company provide customized design and installation services?
A: Yes. Center Enamel offers full-element customized design based on local environmental conditions (snow loads, wind speeds, seismic zones, etc.) and client requirements. We also dispatch professional teams to provide on-site installation training and after-sales support, ensuring safe and efficient project delivery.