Boron Removal from Mining and Synthetic Effluents by Electrocoagulation Using Aluminum Electrodes
Table 3
Results obtained for the electrocoagulation and chemical coagulation tests for a synthetic effluent with initial boron concentration of 200 mg L−1 and for the effluent of mining company with initial boron concentration of 16.220 mg L−1.
Effluent
Test
[ES] mol L−1
pH
j (mA cm−2)
Time (min)
[B] mgL−1
Boron removal (%)
Synthetic
EC
0.400
8.4
14.42
30
149.57
25.2
Synthetic
EC
0.100
8.7
14.42
30
170.03
15.0
Synthetic
EC
0.200
7.8
4.81
30
165.96
17.0
Synthetic
EC
0.200
8.5
14.42
30
154.42
22.8
Synthetic
CQ
-
8.0
-
60
151.71
24.1
Synthetic
CQ
-
8.0
-
30
164.86
17.6
Synthetic
EC
0.200
10.7
14.42
60
78.07
60.9
Synthetic
EC
0.200
11.9
14.42
90
71.52
64.2
Synthetic
EC
0.200
13.1
14.42
120
81.00
59.5
Synthetic
ECpH
0.200
7.5
14.42
120
69.80
65.1
Mining
EC
0.400
7.5
14.42
90
4.93
69.5
Mining
EC
1.000
7.5
14.42
90
4.58
71.6
Mining
CQ
-
8.0
-
90
14.54
13.9
ECpH = electrocoagulation with pH control at 7.5; j = current density; [ES] = supporting electrolyte concentration; EC = electrocoagulation; CQ = chemical coagulation
