**The COD level of the process water is high, and electrodialysis cannot handle it
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Our company uses electrodialysis to treat *AO acid wastewater, which mainly contains ** and *AO acid. The temperature is 80 degrees Celsius; the COD level, as measured by the cadmium method, is 800 in the inlet water, and it remains at 700 in the outlet water. The conductivity at the outlet is 1 us/m. Can’t electrodialysis reduce the COD level? What could be the substances causing such high COD levels (**bacteria, oil, and similar substances should not be present in the production process)**?
Check the entire system to see if the **solution is contaminated
**What was the conductivity of the waste water in the unit’s condensate cooler in the past? Generally, the value exceeds 10,000; please provide a more detailed description of the situation. If the COD level is high, check the content of *AO acid in the desalinated water. Under normal conditions, the **equipment should be very clean, provided that any solid particles from the outside environment do not get back into the system. If such particles do return, the water is likely to be dirty; the pathways through which they can return are usually the startup tank and F402. To sum it up: *AO acid doesn’t mix well that well, so this possibility is low; the operational requirements for *AO acid are quite strict. 2. The system discharges substances back into the outside environment – this is a common issue among many porous manufacturers. The solenoid spray filters in the electrodialysis membrane stacks often get clogged, you know.