Treatment of geothermal water with high fluoride content by electrocoagulation

Abstract

A B S T R A C TThe performance of electrocoagulation (EC) process in the treatment of geothermal water with high fluoride content was studied. The effect of applied current density, electrode plate number, electrode plate distance, and the temperature of geothermal water was investigated. The results show that EC can effectively reduce fluoride content to a low level, which can supply sanitary standard for drinking water in China (GB 5749-2006(GB 5749- , 2006. With the increase in current density and electrode plate area, the removal efficiency of fluoride in geothermal water was also increased. However, with electrode plate distance increased from 0.5 to 2.0 cm, the fluoride removal efficiency decreased accordingly. The fluoride removal efficiency was improved when geothermal water temperature was increased from 18 to 38˚C, while the fluoride removal efficiency changed little with geothermal water temperature from 38 to 62˚C.

Evaluation of electrocoagulation for the pre-treatment of coal seam water

“…For example, Drouiche et al [68] achieved a 66.8% removal of fluoride from photovoltaic wastewater using EC with aluminium electrodes. Zhang et al [69] also recorded satisfactory reduction in fluoride concentrations from geothermal water by applying aluminium electrocoagulation. As indicated, complete fluoride removal from coal seam water was not observed under the experimental conditions applied.…”

Predictive equations for the defluoridation by electrocoagulation technique using bipolar aluminum electrodes in the absence and presence of additives: a multivariate study

“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13] www.deswater.com doi: 10.1080/19443994.2015.1007487 for the human body is usually from the drinking water which covers about 75-90% of the daily intake [8]. Natural and anthropogenic activities are the major sources of fluoride pollution in water ecosystems.…”

“…The presence of fluoride in high concentrations in drinking water is a public health problem; consequently, its removal is a very essential process and has been the focus of many studies all over the world [1][2][3][4][5][6]. If the fluoride concentration increases to more than 4 mg/L in drinking water, skeletal fluorosis and fluorosis deformity in hips, knees, and other joints can be observed [7].…”

Enhancing the adsorption function of F- by iron and zirconium doped zeolite: Characterization and parameter optimization

“…Nonetheless, the intrinsic features of Fsuch as small atomic weight and halogen-specific structure led to its weak selectivity and low capacity against ZrO 2 . Therefore, numerous attempts are endeavored to develop ZrO 2 -derived materials for defluoridation [25][26][27][28]. For instance, Zhang et al [15] synthesized a kind of carbon hybrid membrane made of amyloid fibril/ZrO 2 nanoparticles that could remove over 99.5% of Fat both low and high (5-200 mg/L) concentrations and showed high selectivity for Fagainst different competitive ions.…”