Improvement of DAF unit outcome using cationic polyacrylamide as flocculent

Talat Ghomashchi, Zahra Akbari, Shirin Malekpour, Marjan Alimirzaee

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


Mixing the wastewater of industries with natural water has caused environmental pollution, so researcher try to obtain methods and optimum conditions for wastewater treatment. One of important stage in wastewater treatment is dissolved air flotation .DAF is used for the removal of suspended solids and oils from wastewater. In this paper, the effect of several parameters on flotation efficiency with Cationic Polyacrylamide as flocculants, was examined, namely, (a) concentration of cationic flocculants, (b) pH (c) fast mixing time, (d) fast mixing speed,(e) slow mixing time,(f) retention time and temperature. After design of experiment, in each trial turbidity of wastewater was measured by spectrophotometer. Results show that contribution of pH and concentration of flocculants on flotation efficiency are 75% and 9% respectively. Cationic Polyacrylamide led to a significant increase in the settling speed and effect of temperature is negligible. In the optimum condition, the outcome of the DAF unit is increased and amount of suspended solid and oil in wastewater is decreased effectively.

Original languageEnglish
Title of host publicationCHISA 2006 - 17th International Congress of Chemical and Process Engineering
Publication statusPublished - 1 Dec 2006
Externally publishedYes
EventInternational Congress of Chemical and Process Engineering 2006 - Prague, Czech Republic
Duration: 27 Aug 200631 Aug 2006
Conference number: 17th


ConferenceInternational Congress of Chemical and Process Engineering 2006
Abbreviated titleCHISA 2006
Country/TerritoryCzech Republic
Internet address

Cite this