| Popis: |
The aim of this study is to treat of waste metalworking fluids (MWFs) originating from the metalworking industry. In the first stage, microfiltration (MF) and chemical coagulation, in which ferric chloride (FeCl2·4H2O) is used as a coagulant, were tried in the treatment of wastewater. It has been observed that ferric chloride has a negative effect on the subsequent treatment stages and the removal efficiency is lower than the microfiltration membranes. removal efficiency of MF membrane (TM10) were found to be 67.2% for COD, 93.2% for SS, 99.3% for turbidity, 98.6% for oil/grease while coagulation with ferric chloride were found to be 24.9% for COD, 66.8% for SS, 50.2% for turbidity, 91.9% for oil/grease. TM10 MF membrane was obtained as best result for pretreatment.The wastewater from the first stage was fed to three different ultrafiltration membranes of 1-10 kDa MWCO. The GE membrane provided the best removal, but not much different from the GH membrane. However, the GH membrane provided higher flux.The total removals after NF were found to be 96.2% for COD, 99.9% for SS, total oil/grease removal and 70.7% for EC. This ensures that the treated wastewater can be reused as process water. |
