LC PURE Laboratory MINI-250 EDI Module An Efficient Choice for Ultra-pure Water Preparation in Small and Medium-sized Laboratories

In the daily scientific research work of small and medium-sized laboratories, a stable and high-quality supply of ultra-pure water is crucial to ensuring the accuracy of experimental results. The LC PURE Laboratory MINI-250 EDI module, with its suitable water production capacity and excellent performance, has become an ideal solution for such scenarios.

Working Principle

The LC PURE Laboratory MINI-250 EDI module cleverly combines electrodialysis and ion exchange technologies. It adsorbs cations and anions in water through internal mixed ion exchange resins. At the same time, the electrodes at both ends of the module provide a transverse DC electric field. Under the action of the electric field, the adsorbed ions pass through the corresponding anion and cation exchange membranes respectively.

A fresh water chamber is formed between the anion exchange membrane facing the positive electrode and the cation exchange membrane facing the negative electrode, and a concentrated water chamber is formed between the anion membrane facing the negative electrode and the cation membrane facing the positive electrode. When water flows through these chambers, ions in the fresh water chamber are continuously removed, gradually improving the water purity, while the concentrated water chamber collects and discharges the removed ions, thus realizing the continuous production of ultra-pure water, which meets the water production demand of MINI-250 for small and medium-sized experimental scenarios.

Detailed Parameter Table

Inlet Water Quality Requirements

To ensure the stable operation and prolong the service life of the MINI-250 EDI module, there are strict requirements for the inlet water:

• The inlet water must be reverse osmosis (RO) product water, with an inlet conductivity of less than 10μs/cm (including CO₂ and silicon). If it can be controlled within 5μs/cm, the module loss can be further reduced.

• The temperature should be maintained at 5-30℃, and the inlet water pressure should be kept at 0.1-0.3MPa.

• The maximum total chlorine content (Cl₂) should be less than 0.02 ppm, and iron (Fe), manganese (Mn), and sulfide (S⁻) should all be less than 0.01 ppm.

• The pH value should be between 7-8, and the total hardness (calculated as CaCO₃), dissolved organic matter (TOC, calculated as C), and silicon (calculated as SiSO₂) should all be less than 0.5 ppm.

• Oxidizing substances, oil/grease must not be detected.

Practical Application Case

A university biomolecular laboratory mainly conducts protein separation and purification experiments, requiring about 220L of ultra-pure water per day, with extremely high water quality requirements (resistivity ≥15MΩ·cm). The previously used small pure water equipment had large fluctuations in water production and required shutdown for filter replacement every week, which seriously affected the experimental progress.

After introducing the MINI-250, the laboratory has achieved:

1. A stable daily water production of 250L, fully meeting the experimental water demand, without worrying about insufficient water volume.

2. The water resistivity is stable at 16-18MΩ·cm, avoiding protein denaturation caused by water quality fluctuations, and the repeatability of experimental data has increased by 30%.

3. No frequent filter replacement is needed, only simple inspections are required monthly, saving the labor cost of 1 laboratory staff.

4. The concentrated water is recycled for initial washing of laboratory glassware, saving about 2 tons of water per month.

Product Advantages

1. Stable and sufficient water production: The standard water production flow of 250L/h is suitable for the daily water demand of small and medium-sized laboratories, and the water quality is stable, ensuring the reliability of experimental results.

2. Convenient installation and maintenance: The installation conditions are simple, and the 150mm wide body can be easily integrated into the laboratory layout; maintenance only requires a short shutdown, without affecting the experimental process.

3. Environmental protection and economy: No need to treat acid and alkali wastewater, meeting environmental protection requirements. The concentrated water can be reused, reducing water waste and operating costs.

4. Easy operation: It can realize unattended operation, reducing human operation errors and saving energy for laboratory managers.

With its stable performance and suitable water production capacity, the LC PURE Laboratory MINI-250 EDI module provides an efficient and reliable ultra-pure water solution for small and medium-sized experimental scenarios, facilitating the smooth progress of scientific research work.