Why is the excess alkalinity of the saltwater within acceptable limits while the calcium and magnesium levels are still high?
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 at 20:29. The alkalinity level of the saltwater is within the specified range, but the calcium and magnesium levels in it remain high, resulting in poor filtration performance. What could be the reason? # hcbbs
1# After the rain, could it be that the capacity of the equipment is insufficient, preventing adequate settling? Is the high level of calcium and magnesium due to the first-stage brine or the second-stage brine?
The quality of the raw salt is poor； Insufficient equipment capacity
Is it because the filter’s filtering effect is poor? From salt, equipment. Find the problem and take a look at the analysis
Thank you all. For now, we only know that the flow rate of the sand filter is 8 m, and its diameter is 3.5 m. In our case, it seems that the processing capacity of the sand filter is insufficient, and its reaction time is short as well; this is what leads to high levels of calcium and magnesium in the brine. The load on the filter has also increased!
The stage before the sand filter should be a clarification tank – has the water become turbid again? The reasons for back-turbulation are usually large temperature differences and large instantaneous flow rate changes. Or the equipment lacks sufficient capacity. If it’s a recurring issue, try adding salt sludge circulation before entering the clarification tank.
The low temperature is also a reason for incomplete reaction
An increase in flow rate and a reduction in reaction time may also be due to excessive levels of calcium and magnesium. Was it the same before? We also don’t really know much about your actual situation. What has changed in you now compared to before? This makes it easier to find the reason. .
It seems to be caused by an insufficient dwell time.
For 8# ld62002668, the production volume was low in the past, so the levels of calcium and magnesium were within normal ranges. Now that an additional 60,000 tons have been added, the flow rate has nearly doubled, which naturally shortens the reaction time. However, both types of alkalis remain within controlled levels, and the sedimentation in the baffle tank also appears good. The calcium and magnesium levels in the brine filtered by the secondary brine filter are within the specified limits, but the suspended solids level is slightly above the limit!
Production has doubled, yet the volume of Doul barrels has not increased; this is likely due to the small size of those barrels. When water passes through such barrels, the levels of calcium and magnesium increase, mainly because the SS solid content is above the acceptable limit. This in turn increases the load on the sand filters. An excessive amount of salt sludge prevents the sand filters from functioning effectively during backwashing, ultimately resulting in substandard quality of the brine. The problem should be addressed at its root by adding a Dor barrel along with a matching sand filter for use. The above are merely estimates; I am unaware of the scale of your production, the diameter of your Dor barrels, nor the current parameters of your brine and crude salt.