Combining adsorption on activated carbon with electrocoagulation process for copper removal from used water

Abstract

a b s t r a c tIn this work, electrocoagulation (EC) combined to adsorption onto granular activated carbon (GAC) was studied for the removal of copper ions. EC process was firstly optimized. The effect of the main parameters such as: pH (4-8), electrolysis time t EC (5-60 min), current density j (0.277-1.388 mAcm -2 ), conductivity, inter-electrode distanced ie (0.5-2 cm), area volume ratio S/V (3.6-14.4 m , stirring speed = 300 rpm and monopolaire connection) 97% copper removal was achieved with an energy consumption of W = 0.065 KW hm -3 . Combining adsorption on GAC with EC notably reduces the electrolysis required time inducing a strong decrease of energy consumption. The removal of copper from industrial waste water showed the advantage of combining adsorption on GAC with EC in order to reduce the processing time and thus the process energy cost.

Fluoride removal from synthetic groundwater by electrocoagulation process: parametric and energy evaluation

“…Electrochemical technology contributes in many ways to a cleaner environment and covers a very broad range of technology [10][11][12]. Electrocoagulation process is one of the electrochemical methods that have been developed for drinking water treatment.…”

Electrocoagulation coupled adsorption for anaerobic wastewater post-treatment and reuse purposes

“…Finally, comparing the quality of the effluent obtained with reuse standards and literature data, we observed that the electrocoagulation process conjugated to fixed bed adsorption of activated carbon is an effective treatment method for the post-treatment of wastewater for various reuse purposes. Table 5 Summarized guidelines for water reuse from EPA [37] Parameter More restrictive class Less restrictive class pH 6,5-8,5 10,11,12 6-9 1,2,3,4,5,6,7,8,9 BOD (mg/L) ≤ 10 1,3,5 ≤ 30 2,4,6,7,8,9 Turbidity (NTU) ≤ 2 1,3,5,10,11,12 NA 2,4,6,7,8,9 Total Col. (MPN/100 mL) ND 1,3,5,10,11,12 < 200 2,4,6,7,8,9 TSS (mg/L) < 30 2,4,7,8,9 NA 1,3,5,6,10,11,12 TOC (mg/L) < 2 10,11,12 NA 1,2,3,4,5,…”

“…Agricultural reuse in food crops 4 Agricultural reuse in processed food crops or non-food crops 5 Unrestricted impoundments 6 Restricted impoundments 7 Environmental reuse 8…”

“…Wastewater post-treatment techniques, including adsorption [4][5][6], membrane separation [7][8][9][10], electrolysis [11][12][13], ozonization [14,15] and other processes, have been highlighted as advanced wastewater treatment systems for reuse. Electrocoagulation (EC) is an environmentally interesting and efficient technology to remove a variety of pollutants (organic and inorganic).…”

“…Adsorption represents a solution dedicated to the elimination of micro-pollutants and the polishing of wastewater [25,26] and has been applied as a complement to electrolytic systems [5,[27][28][29]. The low energy requirement, absence of by-products with greater toxicity and the capacity of regeneration of adsorbents are considerable advantages of this process [25].…”