News

(I) Softening Equipment Outputs Qualified Water, but Soft Water Tank Water Exceeds Standard

If the water hardness in the soft water tank exceeds the standard, but the water sampling port on the softening equipment tests qualified, this indicates that the softening equipment's water production is unstable and excessive water has been injected into the soft water tank.

Resin softening primarily involves using softening ion exchange resins to replace calcium and magnesium ions, the primary hardness ions in water, through ion exchange. This reduces the amount of calcium and magnesium ions in the water, resulting in softened water. Softened water can be used for production water with lower quality requirements, such as boiler feed water, hotel water, bathing water, central air conditioning, beauty salon water, and kitchen water. A device that uses softening water is called a water softener or softener. Scale inhibitors are not suitable for such systems.

Before using ion exchange resins (whether for water softening, desalination, or other polishing processes), residual chlorine must be rigorously removed from the water. This is not just a standard operating procedure; it's crucial for protecting resin performance, ensuring long-term stable operation, and ensuring economic efficiency.

In water treatment system design, the selection of reverse osmosis membrane elements directly impacts system efficiency and cost. Given the two mainstream sizes, 4-inch (4040) and 8-inch (8040), the decision is far more than a simple "size" decision; it requires a careful balance based on source water characteristics, system scale, and overall economics.

There's no fixed, universally applicable maximum downtime for a reverse osmosis system without flushing. It depends on a combination of several key factors. Neglecting flushing could lead to irreversible membrane performance degradation or even failure.

This is a list of essential instruments for reverse osmosis system operation. These instruments serve as the "eyes" and "ears" for ensuring safe, stable, and efficient system operation and meeting water quality standards:

Unlike traditional ion exchange or reverse osmosis, EDI is an electrochemically driven continuous deionization process. Its core is to maintain a dynamic balance of hydraulic conditions within the dilute, concentrate, and cathode chambers. Flow rate is one of the key variables in this balance.

I. Causes of Siphoning

The siphon effect in membrane systems is typically caused by system downtime or pressure imbalance. Specific causes are as follows:

1. Driven by Liquid Level Difference During Downtime

When the system is down, the inlet pump stops operating, causing a sudden drop in pressure on the inlet side. If there is a high-level reservoir in the product water pipeline or the outlet is lower than the membrane assembly (for example, the product water tank is higher than the membrane), the liquid level difference will create a siphoning force (ΔP = ρgh, where ρ is the liquid density, g is the acceleration due to gravity, and h is the liquid level difference).

Silica contamination in reverse osmosis systems is a thorny issue in water treatment, with complex causes and high remediation costs.

The purpose of the reverse osmosis device shutdown protection is: ① to avoid the growth and contamination of organisms; ② to prevent the formation of metastable salts and scaling in the presence of scale inhibitors when the membrane is shut down, resulting in performance degradation.