Improvement of water quality with high fluoride content

The improvement of water quality with high fluoride content was carried out by precipitation of pollutant with Ca(OH)2 and post-treatment by electrocoagulation. The applied current densities were 100, 200 and 300 A/m2 and the electrolysis time was 60 minutes. The fluoride concentration was lowered from 1000 mg/L to 407 mg/L after the precipitation and to 97 mg/L after the post-treatment by electrocoagulation at 300 A/m2 . The specific energy consumption was calculated and it was in the range of 2.34 – 13.2 kWh/m3

Fluoride removal from aqueous media by electrogenerated Al(OH)3

The removal of fluoride from aqueous media was carried out by electrocoagulation with aluminium sacrificial anode. The electrogenerated Al(OH)3 has high fluoride adsorption capacity. The applied current density was of 10, 30 and 50 A/m2 , respectively, the initial fluoride concentration was of 5 mg/L and 10 mg/L, respectively and pH of 7. The supporting electrolyte was 0.01 M Na Cl. Concentrations of fluoride in the electrolysed solutions of about 0.20 mg/L were obtained

Removal of pharmaceuticals from wastewaters by electrooxidation

The removal of the non-steroidal anti-inflammatory drug diclofenac (DCF) was carried out by electrooxidation on Dimensionally Stable Anodes (DSA) with the composition Ti/Ruo.3Tio.70 2. The DSA electrodes were obtained by thermal decomposition of the appropriate precursors. The electrolyses were carried by using solutions of 100 mg/L DCF in 0.1 M Na2S0 4 supporting electrolyte in acidic medium at various current densities and electrolysis times. The removal of DCF was assessed by recording UV-VIS spectra and chemical oxygen demand (COD) determination of the electrolysed solutions. The results showed the mineralization of the DCF during the electrooxidation on Ti/RuojTiojCb electrodes

Simultaneous fluoride and arsenic removal from groundwater by using aluminium sacrificial anode

The simultaneous removal of fluoride and arsenic in groundwater collected from three deep wells situated in Western part of Romania was carried out by electrocoagulation (EC) with aluminium sacrificial anode. The current density was of 156, 480 and 780 A/m2 , respectively and the electrolysis time 60 min. The removal efficiency of fluoride and arsenic was determined based on their residual concentration. Also, the specific energy consumption was calculated and it was in the range of 0.14 - 1.40 kWh/m3

Development of groundwater management by using electrocoagulation for removal of fluoride and coexisting anions

The electrocoagulation was applied to removal of fluoride and coexisting anions from simulated groundwater. The concentration of fluoride, chloride and sulfate was of 5 ppm, 347 ppm and 199 ppm, respectively. The influence of pH, current density, electrolysis time and sulfate presence were studied. Fluoride and sulfate removal efficiency, chloride concentration and specific energy consumption were calculated

Electrochemical denitrification of water for drinking purpose

Electrocoagulation was used as method of groundwater denitrification for the purpose of obtaining drinking water. The experiments were carried out by using both synthetic solutions and groundwater from the West of Romania. The sacrificial anode was made of aluminium and the cell was equipped either with stainless steel or aluminium cathodes. Also, Linear Scan Voltammetry (LSV) experiments were carried out in order to know the behaviour of aluminium sacrificial anode during the anodic process

Influence of phosphorus and nitrates on the species development of Lemna minor L.

In this paper we wanted to determine the influence of phosphorus and nitrates in the development of Lemna minor L. To achieve this purpose, eight different growth variants were proposed, starting from the Hoagland culture medium, where the concentration of these two compounds varied. The growth rate in the eight experimental variants, ranges between 150% - 325%, with a minimum in the control sample and a maximum at the highest concentration of phosphorus in water