《Table 3–Comparison of aluminum sulphate and polyaluminium chloride.》

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《Investigating the coagulation of non-proteinaceous algal organic matter: Optimizing coagulation performance and identification of removal mechanisms》

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Difference in the lowest Al residual concentrations achieved for alum and PACl（see Table 3）also stem from different Al species distribution for alum and PACl.According to Wang et al.（2014）and Van Benschoten and Edzwald（1990），at pH values of the lowest Al residuals in this study5%‐10%of dosed Al may be present in the form of Ala.High residual Al concentrations may thus be expected，and the portion of Alafor PACl is higher than for alum.This is in accordance with our results and explains higher residual Al concentrations for PACl than for alum achieved in our experiments.Moreover，different Al species distribution for alum and PACl is probably the reason for different efficiencies in removing various MW fractions by alum and PACl，as shown in Section 2.2（Fig.1b，c）.Highly stable Alb（mostly Al13）species of PACl are able to interact with lower-MW fractions through charge neutralization（Yan et al.，2007）Therefore，PACl was more efficient in removing 3–10，10–30and 30–50 kDa fractions than alum.