engleski

Removal of Phosphates From Wastewater by Electrocoagulation

The effect of the electrocoagulation process with aluminum (Al) and iron (Fe) electrodes on phosphate reduction from wastewater is presented. The effect was observed in a reactor volume of 90 [L]. Several tests were done with the varying current density and the duration of the process, while the flow rate through the electrodes was maintained constant (Q = 0.3 [L/s]). Initial phosphate concentration of 100 [mg/L PO4 3-] was applied in all tests. Phosphate concentrations are estimated with indicator strips ranging from 0 to 100 [mg/L] in order to monitor the performance of the reactor. 160 [g] of sodium chloride (NaCl) was added to gain more conductivity of the solution. In addition to phosphate concentration, electrical conductivity, pH, total dissolved solids, NaCl concentration, dissolved oxygen concentration and temperature after 15, 30 and 60 minutes were also measured. It was concluded that aluminum electrodes are better in removing phosphates. After 30 minutes of the electrocoagulation process the phosphate concentration was four times less with Al electrodes. The temperature increased throughout the process as well as the amount of dissolved solids. The concentration of dissolved oxygen was constantly reducing as well as the electrical conductivity which was initially increased by the addition of NaCl. The process with Fe electrodes resulted in slightly more dissolved oxygen, but less total dissolved solids. In addition, the paper also presents the overview of the basic process parameters. The operational costs of the tests, including the cost of materials (electrodes) and operating costs of electricity, were also analyzed.

phosphate removal, electrocoagulation, operating costs

nije evidentirano