In industrial water treatment processes, neutralizing the water’s natural acidic nature and establishing the chemical balance required by the process is of great importance. In this context, caustic soda—or NaOH (sodium hydroxide), as it is known by its chemical formula—is one of the most essential consumables in water treatment plants.
Supplied in liquid form, caustic soda acts as a powerful pH-raising chemical. It is injected into the treatment line in precise, milliliter-level doses via automatic dosing pumps. This process stabilizes the water’s acid-base balance (pH), ensuring both the efficient operation of treatment equipment and protecting the piping systems from corrosion (acidic erosion).
Caustic Soda Dosage in Reverse Osmosis and Ultrafiltration Systems
In advanced membrane technologies such as reverse osmosis (RO) and ultrafiltration (UF), sodium hydroxide can be dosed at two different strategic points depending on the system’s requirements:
pH Balancing at the System Inlet
The pH level of the raw water entering membrane systems may sometimes fall below the membranes’ ideal operating range, or it may be necessary to prevent dissolved gases (such as carbon dioxide) in the water from ionizing and passing through the membrane. Adding a specific amount of reverse osmosis caustic solution to the feed side of the water treatment system adjusts the pH level to the desired point, thereby optimizing membrane performance and treatment quality.
Final pH Adjustment at the System Outlet
The purified water produced by the reverse osmosis process generally has a low pH (slightly acidic) because it has been stripped of its minerals. Directly feeding this water into production processes (food, textiles, steam boilers) can cause corrosion. Precise caustic dosing into the system’s outlet line perfectly completes the final pH balancing process by adjusting the product water’s pH to the targeted neutral or slightly alkaline level.
Endüstriyel Kostik Kullanımının Avantajları
A water treatment caustic dosing system designed with accurate engineering calculations offers the following benefits to your business:
- Corrosion Control: Protects your investment by preventing acid-induced corrosion of metal pipes and precision manufacturing equipment.
- Precision Automation: Real-time water quality is monitored via pH sensors (probes) on the line, ensuring chemicals are dispensed only in the exact amount needed.
- Membrane Protection: By maintaining the correct pH level in the feedwater, it prevents organic and inorganic fouling.
Over 30 Years of Experience and Our Professional Team
The use of reactive chemicals such as caustic soda (NaOH) is a serious engineering task that requires the right equipment and precise calculations. With over 30 years of engineering experience in the water treatment industry, we design the entire process—from the safe storage of the chemical in tanks to its injection at the correct dosage into the inlet or outlet of the line—in accordance with industrial safety standards.
Our professional team meticulously calculates the required amount of caustic to achieve your desired pH level and selects chemical-resistant piping and dosing pumps. Our expert engineers provide continuous post-sales support to ensure proper system calibration, commissioning, and reliable chemical supply.
To establish a fully automated and safe pH balancing infrastructure in your facility, please contact our team of experts.