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 | Volume 12, Number 3 (vol-3 2006) |  | |
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 | Survey of dissolved air flotation (DAF) system efficiency for reduce of pollution of Naz vegetable oil factory's wastewater in Isfahan |  |
 | | Author(s): Mr. H. Keramati *, Dr. AR. Parvaresh and Dr. H. Movahedian Attar | | hkramatee@gmail.com | | Study Type: Original | Subject: Basic Medical Science | | | Article abstract: | | Abstract
Background and Aim: Flotation involves separation of solids from the water phase by attaching the solids to fine air bubbles to decrease the density of the particles. Flotation including of tree type 1. Vacuum flotation, 2. Dispersed air flotation and 3.dissolved air flotation. In this research used from dissolved air flotation. Various industries produce many goods and marchandias and affects our environment. Vegetable oil manufacturing is one of these industries. The main pollutants in the east of this industry are chemical oxygen demand (COD), biochemical oxygen demand (BOD) and Oil. The aim of this assay is to study the reduction of pollution of vegetable oil manufacturing wastewater with “DAF” system.
Materials and Methods: At first phase of these examinations, the optimum dosage of the coagulants was determined. The coagulants that used in this study were Alum and Ferric Chloride. The second phase was flotation. In this series of examinations, oil, COD, total solid, volatile solid, fixed solid and suspended solid measured in raw wastewater and the effluent of the DAF pilot
Results: Optimum value of “pH” for Alum and Chloride ferric obtained 7.5 and 5.5 respectively. And optimum dosage for these obtained 30and 32 mg/l respectively in this search. Mean moval for the parameters of oil, COD, total solid, volatile solid, fixed solid and suspended solid obtained 75.85%, 78.27%, 77.32%, 82.47%, 73.52% and 85.53% respectively.
Conclusion: During pressure rising from 3 to 4 and 5atm removing rate of COD, total solid, volatile solid, fixed solid parameters reduced but oil and suspended solid have increase. In addition to, following increase of flotation time up to 120s all of the measured parameters have increase in removing rate. Optimum A/S for removal of COD, total solid, volatile solid, fixed solid parameters obtained 0.001 and for oil and suspended solid obtained 0.0015
| | | Keywords: Dissolved air flotation; Pollution; Isfahan naz vegetate oil; Alum; Chloride ferric, | |
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