Characterization of an inorganic polymer coagulant and coagulation behavior for humic acid/algae-polluted water treatment: polymeric zinc–ferric–silicate–sulfate coagulant

Abstract

Algae and algae organic matter (AOM) are not the sole pollutants in algae-polluted water. Other pollutants such as colloidal particles and natural organic matter should be simultaneously removed and might influence the treatment of algae and AOM. A new polymeric zinc-ferric-silicate-sulfate (PZFSiS) coagulant was prepared, and the relationship between its structure and performance in the treatment of humic acid (HA)/algae-polluted water was discussed. PZFSiS coagulants prepared under different conditions had different distributions of Fe(III) species. The coagulant possessing the highest Fe b content was able to treat turbidity and HA well. As a copolymer of Fe(III), Zn(II) and Si(IV), PZFSiS had a positive charge in water and thus neutralized the negative surface charges of pollutants. The adsorption of hydroxyl polymer formed by Fe/Zn during the hydrolysis process contributed to the removal of organic matter. The dosage of PZFSiS and pH significantly influenced pollutant removal. Colloidal particles in the water competed with the organic matter, markedly decreasing the removal efficiency of organic matter by coagulation.

Influence of Organic Ligands on the Colloidal Stability and Removal of ZnO Nanoparticles from Synthetic Waters by Coagulation

“…Figure 8B shows the IR spectra of synthetic waters (S6, S7, and S8) flocs by FC. The broad peak in all flocs at 3327 cm −1 is due to the polar interaction of Fe ions and their hydrolyzed products, which tend to form complexes with metal ions [59]. The disappearance of S-H band at 2548 cm −1 in S7 indicates the formation of covalent bonds between thiols and Zn 2+ onto the NPs surface [60].…”

Probing the application of a zirconium coagulant in a coagulation–ultrafiltration process: observations on organics removal and membrane fouling

“…Coagulation is considered as an indispensable step to be adopted prior to ltration (e.g., sand ltration and membrane separation), because it allows for the effective removal of particulates and natural organic matters (NOM). 1 Particulates in source water are destabilized by the addition of positively charged coagulants, and they aggregate to larger ocs during random collision, which is usually driven by mechanical agitation. 2 The removal of NOM depends on the direct precipitation of NOM-ocs and/or adsorption onto metal hydroxide precipitates.…”

Performance and properties of coking nanofiltration concentrate treatment and membrane fouling mitigation by an Fe(ii)/persulfate-coagulation-ultrafiltration process

“…33 Under this condition, coagulation is considered as an indispensable step to be adopted prior to UF to effectively remove the suspended Fe(III) oc. 34 In this study, with the effect of low-dose coagulants, the turbidity of effluent, electrical conductivity and the concentration of iron content reduced by 79.18%, 8.83% and more than 98%, respectively. The TOC was further reduced.…”

“…The combination of Fe(II)/PS and PFS was more effective than a single treatment and could compensate for the single Fe(II)/PS process by effective removal of suspended Fe(III) oc with the addition of a low-dose coagulant, which can further improve the quality of product water, mitigate pore blocking and form a cake layer. Among the selected coagulants, 34 Wu et al 56 concluded that PFS was the most effective in controlling membrane fouling. With the nal Fe(II) concentration reducing to 0.3 mg L À1 , no membrane fouling occurred.…”