Dissolved Air Flotation of Bioreactor Effluent Using Low Dosages of Polymer and Iron

摘要

1. Good SS removal could be obtained by flotation when low dosages of iron and polymer were combined. 2. The dosages of iron and polymer together with raw water properties like SCOD are more important than molecular weight or charge density of the polymers. 3. There were no significant differences between polyDADMACs and the best PAMs. With metal coagulant, the best PAM was a medium weight, high charge density polymer. Without metal, high molecular weight PAMs gave the best result. 4. Multivariate analysis is a good tool when analysing results with variable water quality. Although the regression model developed for SS removal was able to predict the results well, it needs additional tests to fill the gaps in the data set and an independent verification test.