Cyanobacteria blooms due to the eutrophication of surface waters have become a worldwide problem. To efficiently treat cyanobacteria-laden water and enhance the dewaterability of the cyanobacteria-containing sludge for its further resource utilization, NaClO-Fe(II) was employed as a chemical conditioner herein based on the oxidation property of NaClO and the flocculation ability of in-situ formed Fe(III). Results showed that the algae and DOC removal rate achieved nearly 100% and 90% respectively after NaClO-Fe(II) conditioning. With the increase of NaClO dose, the sludge dewatering performance was firstly improved and obtained the optimal effect at 1.5-2.0 mg/L NaClO dose whereas significantly deteriorated upon NaClO dose was excessive. The better aggregation effect and more compact floc structure resulting from the promotion of charge neutralization can account for the improvement of dewaterability. Additionally, EEM measurements indicated that the decline of protein-like substances in the soluble extracellular polymeric substances (S-EPS) was favorable for cyanobacteria-containing sludge dewatering. Moreover, the deterioration of the dewatering performance can be ascribed to the excessive oxidation of algae cells causing cell lysis and undesirable release of algal metabolites. Overall, appropriate NaClO dose with the in-situ Fe(III) can enhance the treatment of cyanobacteria-laden water and the dewatering performance of cyanobacteria-containing sludge, which illustrated the practical feasibility of applying widely-used reagents NaClO-Fe(II) into cyanobacteria-laden water treatment.

Effect and mechanism of NaClO-Fe(II) conditioning on the treatment of cyanobacteria-laden water and the dewatering performance of cyanobacteria-containing sludge

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.