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Qingdao Conqinphi Environmental Technology Group Co., Ltd., a leading manufacturer established in 2015 with a 10,000–30,000 m² factory and over 200 skilled employees, proudly presents our Sodium Sulfate Freeze Crystallization System — a cutting-edge solution for wastewater treatment and zero liquid discharge (ZLD). This system leverages the natural process of freeze crystallization to efficiently separate sodium sulfate from industrial effluents, achieving both high-purity salt recovery and near-complete water reuse. With annual exports exceeding US$10 million and a global customer base spanning North America, Europe, Asia, and beyond, our technology is trusted by industries seeking sustainable, cost-effective liquid waste management.
Unlike traditional evaporation-based methods, our freeze crystallization system operates at low temperatures, significantly reducing energy consumption and scaling issues. It is ideal for industries such as chemical manufacturing, mining, textile dyeing, and power generation, where sodium sulfate is a common byproduct. By converting waste into valuable resources, our system helps clients meet stringent environmental regulations while lowering operational costs.
Key Features & Technical Specifications
- Advanced Freeze Crystallization Technology — Uses controlled ice nucleation and growth to selectively crystallize sodium sulfate, leaving a concentrated brine for further processing.
- High Purity Salt Recovery — Achieves sodium sulfate crystals with purity ≥99%, suitable for reuse in detergents, glass, or pulp industries.
- Zero Liquid Discharge Capability — Recovers up to 95% of water as clean condensate, minimizing wastewater discharge to near zero.
- Energy Efficient — Consumes 30–50% less energy than conventional evaporative crystallizers due to the low latent heat of freezing.
- Corrosion-Resistant Materials — Constructed from SS316L or duplex stainless steel, ensuring long service life even in aggressive chemical environments.
- Fully Automated Control — PLC-based system with HMI touchscreen, enabling real-time monitoring, data logging, and remote operation via Ethernet.
- Modular & Customizable Design — Available in capacities from 1 m³/h to 100 m³/h, with flexible configurations to fit existing plant layouts.
- Low Maintenance — Fewer moving parts and no scaling on heat transfer surfaces reduces downtime and cleaning costs.
Technical Parameters (Typical Model)
| Parameter | Value | Remarks |
|---|---|---|
| Feed Flow Rate | 10 m³/h | Customizable from 1–100 m³/h |
| Sodium Sulfate Concentration in Feed | 5–20% by weight | Higher concentrations improve efficiency |
| Operating Temperature | -10°C to 0°C | Crystallization stage |
| Ice Crystal Size | 0.5–2 mm | Controlled by residence time |
| Salt Purity | ≥99% | After washing and drying |
| Water Recovery Rate | ≥90% | As condensate for reuse |
| Power Consumption | ~50 kW (for 10 m³/h) | Optimized via heat integration |
| Material of Construction | SS316L / Duplex | Optional: Hastelloy for aggressive streams |
Advantages Over Conventional Technologies
- Lower Energy Costs — Freezing requires about 1/7th the energy of vaporization, drastically cutting utility bills.
- No Scaling or Fouling — Ice crystals form on smooth surfaces, preventing scale buildup common in evaporators.
- Simpler Pretreatment — Tolerates higher suspended solids and organic loads without clogging.
- Environmentally Friendly — No chemical additives required; operates at near-ambient pressure.
- High Recovery Value — Produces saleable sodium sulfate, turning waste into profit.
Our system is designed for seamless integration with existing ZLD trains. Whether used as a primary crystallizer or a polishing step, it consistently delivers reliable performance. The control system allows operators to adjust parameters such as ice slurry density, wash water ratio, and discharge intervals to optimize output quality.
Trust & Reliability
Qingdao Conqinphi Environmental Technology Group Co., Ltd. has been a trusted partner in environmental solutions since 2015. With a factory spanning 10,000–30,000 m² and a dedicated team of 201–300 employees, we produce high-quality equipment that meets international standards. Our company holds certifications including ISO9001, ISO14001, OHSAS18001, and many others (e.g., HACCP, TL900, SA8000), reflecting our commitment to quality, safety, and social responsibility. We ship from Qingdao Port to markets worldwide — North America, South America, Europe, Asia, Africa, Oceania, and the Middle East. Our annual export value of US$10–50 million underscores global confidence in our products.
We offer comprehensive after-sales support, including installation supervision, commissioning, training, and spare parts supply. Our engineers are available for on-site service and remote troubleshooting. To date, we have successfully deployed over 50 freeze crystallization systems for sodium sulfate recovery across various industries, with a customer satisfaction rate above 98%.
Ready to achieve zero liquid discharge while recovering valuable resources? Contact us today for a customized proposal tailored to your wastewater characteristics and capacity requirements. Our team will provide you with a detailed technical evaluation and a competitive quotation. Reduce your environmental footprint and operational costs with Conqinphi’s advanced freeze crystallization technology.
Frequently Asked Questions
-
What is the typical payback period for this system?
Depending on the volume of sodium sulfate recovered and local energy costs, most clients achieve a payback within 2–3 years, thanks to energy savings and salt sales. -
Can the system handle feed streams with high organic content?
Yes, our freeze crystallization process is tolerant to organics; however, a pre-treatment step (e.g., microfiltration) may be recommended to protect downstream equipment. -
What is the minimum sodium sulfate concentration required?
For economic operation, a feed concentration of at least 3% by weight is recommended. Lower concentrations can be handled but may require larger equipment. -
How does the system perform in cold climates?
Freeze crystallization actually benefits from colder ambient temperatures, reducing refrigeration load. The system is designed to operate efficiently in a wide range of climates. -
Is the recovered salt suitable for industrial reuse?
Absolutely. The salt purity ≥99% meets standards for many applications, including detergent manufacturing, glass production, and pulp processing. -
What maintenance is required?
Routine checks of pumps, compressors, and sensors; periodic cleaning of the crystallizer (typically once every 3–6 months depending on feedstock). -
Can I integrate this system with an existing evaporator?
Yes, it can be used as a standalone or as a pre-concentration step before an evaporator, or as a final crystallizer for ZLD. Our engineers will design the best integration. -
What warranty do you offer?
We provide a standard 12-month warranty from commissioning, with extended warranty options available upon request.
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