Can an excessive amount of PAC added have an impact on COD?
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I’m asking for help from all the experts here! Will an excessive amount of PAC added have an impact on COD? Why does the COD removal rate decrease as the amount of PAC added increases? ?
PAC does not increase COD, but an excessive amount of PAC can cause instability in sludge sedimentation, resulting in poor separation effects; this leads to an increase in SS levels, which in turn increases COD
PAC does not increase COD; however, an increase in chloride ions can interfere with the detection of COD, causing it to rise.
An excessive amount of PAC added can make the coagulated effluent turbid, affecting the coagulation process and thereby impacting the removal of organic substances, which results in a lower COD removal rate； Furthermore, an excess of PAC leads to significant interference from chloride ions during COD measurement; if the amount of mercury sulfate is not increased, this will result in higher COD measurement values.