Membrane-based denitration
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Our company has recently launched a new denitration project using the membrane method. During the commissioning process, it was found that the flow rate of the raw material, brackish water, was unstable, which led to unstable pH levels and affected subsequent production. I would like to ask if any of you have encountered such a situation? How did everyone solve it then?
Check the stability of the control valve.
The key is to check whether the electrolytic production is stable, and to investigate for any issues at the source.
First, there should be a pre-treatment buffer tank; acid is added to this tank for rough adjustment, after which the mixture is pumped out and sodium hydride along with acid are added for fine adjustment. It then goes into a heat exchanger, an activated carbon unit, and safety systems, before reaching another storage tank. From there, it is pumped under high pressure into the membrane system. The entire process allows for stable regulation, and in cases where the output is not up to standard, it can simply be directed elsewhere.
A pH meter is added to the pipeline, and control valves and flow meters are installed on the chemical dosing pipeline; a control program is used to achieve interlocked control of the pH value and the chemical dosing rate.
A pH meter is added to the pipeline, and control valves and flow meters are installed on the chemical dosing pipeline; a control program is used to achieve interlocked control of the pH value and the chemical dosing rate.
Do you adjust the pH by adding acid after or before adding sodium sulfite?
We also use membrane-based denitration; the flow rate and pH are relatively stable, with variable-frequency pumps or control valves used to regulate the flow rate