Are the magnesium and alkalinity levels high in the saltwater after pretreatment?
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Through analysis and testing, why are both the alkali content and magnesium content in the pretreated saline above the specified limits? After the reaction, there should be an excess of one of the intermediates. Simple experiments were conducted on the samples: the addition of sodium hydroxide to the samples resulted in the formation of a precipitate, and at the same time the magnesium content decreased. What exactly is excess alkali?
When sodium hydroxide reacts with magnesium, it’s impossible for both to remain unchanged; either both are completely reacted, or one is in excess while the other is completely reacted. We used acid-base titration to determine the alkali and complexometric titration to determine magnesium, and it was shown that there was a residue in both cases.
Has the pre-treater become turbid again? Is the flow rate too high? Is there sufficient reaction time? What is the amount of ferric chloride flocculant added? Make a comprehensive assessment, please