China’s Leading Biological Wastewater Tank Manufacturer — Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel)
Created on 01.08
China’s Leading Biological Wastewater Tank Manufacturer — Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel)
In an age where urbanization and industrial expansion continue to reshape human civilization, treating and reusing wastewater has become an indispensable priority. Around the world, biological wastewater treatment systems play a pivotal role in safeguarding ecosystems, protecting public health, and supporting the circular economy. At the heart of these systems — where science meets structure — are biological wastewater tanks: specialized containment systems designed to foster microbial decomposition of organic matter and transform pollutants into clean, reusable water.
For in this nexus of biology, engineering, and sustainability, one company stands above the rest — Shijiazhuang Zhengzhong Technology Co., Ltd., known globally as Center Enamel. As China’s leading manufacturer of biological wastewater tanks, Center Enamel blends decades of materials science research with cutting-edge construction and environmental stewardship.
With over 35 years of experience, a manufacturing base spanning 150,000 m², and project experience in more than 100 countries, Center Enamel is a global leader in Glass-Fused-to-Steel (GFS) tank solutions, helping industries and municipalities build a cleaner future.
1. The Growing Importance of Biological Wastewater Treatment
The world generates over 380 billion cubic meters of wastewater annually, much of which contains organic contaminants, nutrients, oils, and suspended solids. Traditional physicochemical methods alone are insufficient to treat this magnitude of pollution efficiently. Biological wastewater treatment — leveraging naturally occurring microorganisms — provides an eco-friendly, renewable, and cost-effective alternative.
Microbial communities consume and convert pollutants into harmless gases and biomass. In doing so, biological treatment significantly reduces chemical oxygen demand (COD), biochemical oxygen demand (BOD), and nitrogen/phosphorus loads, producing effluent suitable for reuse or safe discharge.
However, biological processes demand precisely engineered environments: constant oxygen levels, temperature regulation, and containment capable of resisting corrosive forces caused by moisture, chemicals, and microbial by-products. That’s where Center Enamel’s biological wastewater tanks — engineered using Glass-Fused-to-Steel technology — play a crucial role.
2. About Center Enamel — Innovating for a Sustainable Planet
Established in 2008, Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) was the first company in China to design and manufacture Glass-Fused-to-Steel tanks, and remains the industry leader in Asia. Over its 35-year journey, Center Enamel has combined advanced material technologies with architectural precision to offer safe, durable, and environmentally responsible containment solutions.
Key achievements include:
· 150,000 m² facility equipped with state-of-the-art CNC machining and automated enameling lines.
· Over 300,000 enamel-coated panels manufactured annually.
· 30,000+ completed projects across more than 100 countries.
· Certified to international standards: ISO 9001, ISO 45001, ISO 14001, EN 1090, AWWA D103-09, and NSF/ANSI 61.
· Holder of 200+ patents in enameling chemistry, tank sealing systems, and corrosion-resistant technologies.
Driven by a mission to deliver “Engineering Excellence for Environmental Harmony,” Center Enamel is trusted globally for its reliability, professionalism, and world-class expertise in wastewater and renewable energy infrastructure.
3. Glass-Fused-to-Steel Technology — The Foundation of Durability
At the core of Center Enamel’s biological wastewater tanks is its proprietary Glass-Fused-to-Steel (GFS) process — a state-of-the-art technology that merges glass and steel at high temperatures to create a composite material of exceptional strength and chemical stability.
During manufacturing, special low-carbon steel sheets are coated with glass frit and baked in furnaces between 820°C and 930°C. The molten glass fuses into the steel, forming an inert and corrosion-resistant surface. This “glass-steel composite” combines:
· The toughness and flexibility of steel for structural endurance.
· The chemical inertness of glass for corrosion prevention.
Key advantages of GFS coatings:
· Exceptional pH tolerance ranging from 1 to 14.
· High adhesion (≥ 3450 N/cm²) to steel substrate.
· Smooth, non-reactive, and easily cleanable enamel finish.
· UV resistance and long-term color retention.
· Average lifespan exceeding 30 years in harsh environments.
This technology ensures that tanks maintain integrity under constant exposure to biological by-products, acids, gases, and fluctuating temperatures.
4. The Role of Biological Wastewater Tanks in Treatment Systems
Biological wastewater tanks are engineered for processes that leverage microbial activity to degrade pollutants in wastewater. Center Enamel’s tanks are widely used in both aerobic and anaerobic treatment applications within municipal and industrial settings.
Common applications include:
· Aeration tanks: For oxygen-driven degradation of organics.
· Anaerobic digesters: For biogas generation from sludge and organic waste.
· Sequencing batch reactors (SBRs): For periodic aeration and sedimentation.
· Sludge thickening or storage tanks: For biological stabilization before disposal.
· Equalization tanks: To manage flow and quality variations prior to biological processing.
From small municipal plants to complex industrial ecosystems, GFS biological tanks enable flexible, efficient, and environmentally compliant wastewater management.
5. Key Advantages of Center Enamel Biological Wastewater Tanks
1. Superior Corrosion Resistance
Microbial metabolism and wastewater composition generate corrosive substances like hydrogen sulfide, ammonia, and volatile acids. GFS coatings provide unmatched resistance, preventing rust, peeling, or degradation.
2. Gas-Tight and Leak-Proof Construction
Bolted panels are joined with high-grade EPDM or PTFE seals and stainless-steel fasteners, ensuring complete containment of liquids and gases — essential for anaerobic digestion where methane recovery efficiency matters.
3. Long Service Life
Fully enamel-coated steel maintains strength and surface integrity for over 30 years, reducing lifetime operational costs compared to concrete or epoxy-lined steel.
4. Modular and Fast Installation
Prefabricated panels are delivered worldwide and assembled quickly without welding, minimizing environmental disruption and construction timelines.
5. Low Maintenance and Easy Cleaning
Enamel-coated surfaces resist sticking and biological fouling, making sludge removal and cleaning simple — vital for maintaining optimal microbial performance.
6. Sustainability and Environmental Safety
All materials are eco-friendly and recyclable. The tanks require zero repainting or toxic chemical maintenance, ensuring minimal environmental impact.
7. Aesthetic and Customizable Design
Available in standard colors such as cobalt blue, desert tan, olive green, or customized finishes to harmonize with surrounding landscapes.
6. Technical Specifications
Parameter | Specification |
Coating Type | Double-sided Glass-Fused-to-Steel |
Firing Temperature | 820°C–930°C |
Coating Thickness | 0.25–0.45mm per side |
Hardness | 6.0 Mohs |
Adhesion Strength | ≥ 3450 N/cm² |
pH Tolerance | 1–14 |
Electrical Integrity | 1500V Holiday Test Passed |
Design Life | ≥ 30 Years |
Tank Capacity | 20 m³ – 25,000 m³ |
Engineering Standard | AWWA D103 / EN ISO 28765 |
Structure Type | Modular Bolted Construction |
7. Design and Engineering Excellence
Each tank delivered by Center Enamel is the result of comprehensive engineering analysis and customization. Using finite element modeling (FEM) and 3D simulation software, the company ensures that each structure achieves optimal performance based on its intended function.
Design factors include:
· Hydrostatic and seismic load analysis.
· Wind and snow load resistance.
· Foundation compatibility (ring beam or slab).
· Thermal expansion modeling for temperature-sensitive processes.
· Roof options: aluminum geodesic domes, GFS roofs, or membrane covers.
· Process integration: aerators, gas mixing, piping, and monitoring systems.
All tanks are built under ISO-certified quality systems, accompanied by third-party testing from TÜV Rheinland, SGS, or Bureau Veritas (BV) to ensure safety and reliability.
8. Market Applications — From Municipal to Industrial
Center Enamel’s biological wastewater tanks are versatile and do more than protect the environment—they sustain industry and community progress across sectors:
· Municipal wastewater treatment plants
· – Aerobic and anaerobic bioreactors for organic waste stabilization.
· – Equalization and clarification tanks for pre- and post-treatment.
· Food & Beverage Industry
· – Biological digestion for organic-rich effluent (sugar, dairy, breweries).
· – Odor-controlled tanks for high-BOD processing water.
· Pharmaceutical and Chemical Plants
· – Containment of biologically active wastewater needing bioremediation.
· Agriculture and Animal Waste Management
· – Biogas-producing digesters transforming manure into renewable energy.
· Textile and Pulp Industry
· – Tanks for biological oxidation to reduce dyes and organics.
Center Enamel’s flexible configuration capabilities allow seamless adaptation to diverse global environmental norms and climatic conditions.
11. Commitment to Sustainability and Green Manufacturing
Center Enamel is deeply committed to minimizing its environmental footprint—both in product design and production processes.
· Energy Efficiency: 70% of production energy is renewable, reducing greenhouse gas emissions.
· Waste Minimization: Factory achieves 95% water recycling and zero liquid discharge during manufacturing.
· Eco-Friendly Materials: GFS materials are toxin-free and recyclable at end of service life.
· Global Compliance: Every product meets ESG and green plant sustainability certifications.
Through innovation and responsibility, Center Enamel ensures its solutions not only serve industries but also protect the planet.
12. Comprehensive Customer Support
Center Enamel provides a full-service project lifecycle to guarantee maximum client satisfaction:
1. Consultation & Feasibility Study: Customized recommendations for biological treatment processes and tank sizing.
2. Design & Engineering: Detailed modeling meeting local design codes and operational needs.
3. Production & Testing: In-house quality control with automated enameling precision.
4. Shipping & Installation: Modular design allows rapid assembly anywhere in the world.
5. Commissioning & Operator Training: On-site guidance ensuring optimal system performance.
6. After-Sales Support: Global network providing maintenance, inspections, and upgrades.
With continuous support from concept to operation, Center Enamel builds trust by ensuring every project’s long-term success.
13. Competitive Advantages
· China’s first GFS tank manufacturer with 35+ years of proven expertise.
· Large-scale production for fast delivery and cost competitiveness.
· One-stop service from design to commissioning.
· Global certifications ensuring universal acceptance.
· Advanced sustainability and safety compliance.
· Strong supply network supporting large municipal and industrial projects.
These qualities have made Center Enamel a preferred supplier for leading EPC firms, government agencies, and multinational corporations worldwide.
14. Looking Ahead — Innovation for a Greener Tomorrow
As cities and industries transition toward carbon neutrality and circular economies, biological wastewater treatment will only grow in importance. Center Enamel is investing heavily in future-forward innovations such as:
· Nano-enhanced enamel coatings for increased protection.
· Hybrid anaerobic-aerobic systems for energy-positive operations.
· Carbon capture and biogas utilization technologies.
· AI-driven water reuse networks connecting multiple industrial facilities.
Through relentless innovation and worldwide collaboration, Center Enamel aims to redefine how humanity manages water—turning waste streams into vital resources for energy, agriculture, and environmental restoration.
In today’s industrial and municipal landscapes, biological wastewater treatment represents both a technological and moral commitment — to preserve our planet’s water resources for generations to come.
For over three decades, Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) has led this global mission through innovation, quality, and sustainability. Its Glass-Fused-to-Steel biological wastewater tanks deliver unmatched performance, longevity, and environmental safety, empowering clients worldwide to meet the highest standards of efficiency and ecological responsibility.
As China’s leading biological wastewater tank manufacturer, Center Enamel continues to shape the future of sustainable infrastructure—one tank, one project, and one partnership at a time.
Center Enamel — Engineering a Cleaner, Greener World
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