The concentrated water generated by pure water equipment after operation must be treated, so how should the concentrated water of pure water equipment be treated? Why does pure water corrode equipment and what are the solutions? Below, Jiajie Water Treatment will provide a detailed introduction for everyone.

How to treat concentrated water from pure water equipment?

1. After integrating the production process and preparing for treatment, it can be used as production and manufacturing tap water, such as backwash water, ash removal water, and cooling circulating water for filtration systems. For some main purposes, tap water with too low regulations can be immediately recycled and reused, such as ash flushing and slag flushing;

2. After treatment, it meets the relevant specifications for tap water and can be used as raw water for miscellaneous purposes, such as road spraying and dust removal, landscaping tap water, flushing toilets, car cleaning, factory floor cleaning, and construction projects;

3. After preliminary treatment, it shall be sent to the industrial park sewage treatment station for treatment in accordance with the transfer regulations;

Volatile extraction, such as volatilization ponds, uses membrane distillation (MD) technology to collect concentrated water as much as possible (with a utilization rate of over 95%) and even crystallize it under superheated steam using temperature difference;

5. Qualified treatment and discharge into the ocean or groundwater;

6. After preliminary treatment, if it meets relevant regulations and is accepted by municipal engineering and urban sewage treatment stations, it can be discharged into the municipal engineering wastewater pipeline network and sent to the urban sewage treatment station for treatment;

7. If it meets the relevant tap water standards or is used for irrigation and cultivation after being mixed with other water, this method is used less frequently.

Why does pure water corrode equipment?

Under normal circumstances, material rust and corrosion are often caused by acidic or alkaline water, turbid water, and residue. For water purification equipment made of metal materials, the surface of stainless steel plates will be covered with a uniform layer of chromium oxide protective layer thickness to resist the corrosion of stainless steel plates by high-temperature water, acidic or alkaline water, or turbid water. If the pipeline of the water purification equipment rusts due to passivation treatment corrosion, it indicates that the original film on the surface of the stainless steel plate is no longer effective, which means that the passivation treatment measures of the metal material used are not well done.

What to do if pure water equipment corrodes and rusts?

1. When using maintenance film or building paint to avoid corrosion, some of the maintenance film may be reversed or the building paint may fall, causing corrosion in the affected area.

2. Metal materials themselves have defects, such as laser cutting, scratches, gaps, or local stresses listed on the surface. This type of region has a lower potential difference compared to other locations, resulting in anodic oxidation and corrosion.

3. Delicate calcium bicarbonate dirt can maintain and maintain carbon steel from being corroded by water. Therefore, when some dirt is removed, corrosion occurs on this exposed metal material. Therefore, the old cooling circulating water management system must be cleaned of old dirt before driving to reduce some corrosion.

4. In the solution touched by the surface of metal materials, the concentration of oxygen varies, forming a concentration difference in oxygen for charging batteries. When there is sufficient oxygen, it becomes the negative electrode, while when there is insufficient oxygen, it becomes anodic oxidation and corrosion.

5. Some adhered sand particles, air oxide skin, and alluvial deposits on the surface of metal materials turn the clean surface into a negative electrode, while the uncleaned adhered residue becomes anodized due to insufficient oxygen. Under this adhered residue, it easily forms crevice corrosion. Therefore, before driving the cold circulating water management system, it is necessary to clean the surface of the metal material.

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