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Fe−2e−→Fe2+ Eθ(Fe/Fe2+)=−0.44 V
| (1) |
4Fe2++8OH−+O2+2H2O→4Fe(OH)3
| (2) |
O2+4H++4e−→2O·+4[H] Eθ(O2/[H])=+1.23 V
| (3) |
O2+2H++2e−→H2O2 Eθ(O2/H2O2)=+0.68 V
| (4) |
Fig. 1 Schematic diagram of internal-loop iron-carbon micro-electrolysis reactors

1 实验部分
1.1 试剂和仪器
1.2 污水水质
1.3 材料处理
1.4 实验方法
1.5 分析方法
η=A0−A1A0×100%
| (5) |
1.6 实验设计
1.6.1 单因素实验
1.6.2 响应曲面实验
Y=∝0+k∑i=1∝iXi+k∑i=1∝iiX2i+k∑1<i<j<k∝ijXiXj
| (6) |
1.6.3 验证实验
2 结果与讨论
2.1 单因素实验
2.1.1 反应时间对处理效果的影响
Fig. 2 Effect of reaction time on COD and chroma removal efficiency

2.1.2 曝气量对处理效果的影响
Fig. 3 Effect of aeration rate on COD removal rate and chroma removal efficiency
Fig. 3 Effect of aeration rate on COD removal rate and chroma removal efficiency

2.1.3 pH对处理效果的影响
Fig. 4 Effect of pH on COD removal rate and chroma removal efficiency

2.1.4 铁炭比对处理效果的影响
Fig. 5 Effect of iron-carbon ratio on COD removal rate and chroma removal efficiency
Fig. 5 Effect of iron-carbon ratio on COD removal rate and chroma removal efficiency

2.2 响应曲面分析与优化
2.2.1 响应曲面设计
Table 1 Variance and level design of experiment
因素 | 变量 | 水平 | ||
−1 | 0 | +1 | ||
A | 曝气量/(m3·h−1) | 0.1 | 0.2 | 0.3 |
B | pH | 2 | 3.5 | 5 |
C | 铁炭比 | 1:2 | 1:1 | 2:1 |
Table 2 Box-Behnken design arrangement and experimental results
序号 | (A)曝气量/(m3·h−1) | (B)铁炭比 | (C)pH | COD去除率/% |
1 | 0 | 0 | 0 | 69.20 |
2 | 0 | 0 | 0 | 62.29 |
3 | 0 | 1 | −1 | 52.86 |
4 | 1 | 0 | −1 | 49.29 |
5 | −1 | 0 | −1 | 60.00 |
6 | 1 | 0 | 1 | 42.86 |
7 | 0 | 0 | 0 | 62.92 |
8 | 1 | 1 | 0 | 51.60 |
9 | 0 | 0 | 0 | 63.54 |
10 | 0 | 0 | 0 | 62.00 |
11 | −1 | −1 | 0 | 65.43 |
12 | −1 | 0 | 1 | 56.43 |
13 | 0 | 1 | 1 | 46.43 |
14 | 0 | −1 | 1 | 53.57 |
15 | 1 | −1 | 0 | 59.15 |
16 | −1 | 1 | 0 | 56.63 |
17 | 0 | −1 | −1 | 59.29 |
2.2.2 ANOVA分析及二次回归拟合
Y=63.99−4.45A−3.74B−2.77C+0.31AB−0.72AC−0.18BC−3.34A2−2.45B2−8.51C2
| (7) |
Table 3 Regression coefficients and the significance test of main factors
因素 | 回归系数 | 标准误差 | 平方和 | F值 | P值 Prob (P)>F | 显著性 |
截距(模型) | 63.99 | 1.29 | 740.11 | 9.94 | 0.003 1 | 显著 |
(A)曝气量 | −4.45 | 1.02 | 158.33 | 19.14 | 0.003 3 | 显著 |
(B)铁炭比 | −3.74 | 1.02 | 111.90 | 13.53 | 0.007 9 | 显著 |
(C)pH | −2.77 | 1.02 | 61.33 | 7.41 | 0.029 7 | 显著 |
AB | 0.31 | 1.44 | 0.39 | 0.05 | 0.834 2 | 不显著 |
AC | −0.72 | 1.44 | 2.04 | 0.25 | 0.634 3 | 不显著 |
BC | −0.18 | 1.44 | 0.13 | 0.02 | 0.905 2 | 不显著 |
A2 | −3.34 | 1.40 | 46.97 | 5.68 | 0.048 7 | 显著 |
B2 | −2.45 | 1.40 | 25.22 | 3.05 | 0.124 3 | 不显著 |
C2 | −8.51 | 1.40 | 304.57 | 36.81 | 0.000 5 | 显著 |
残差 | 57.91 | |||||
失拟项 | 22.57 | 0.85 | 0.534 | 不显著 | ||
纯误差 | 35.34 | 0.003 1 |
2.2.3 交互作用的响应曲面分析
Fig. 6 3D surface and contour showing effects of aeration rate, pH and their interaction on COD removal efficiency
Fig. 6 3D surface and contour showing effects of aeration rate, pH and their interaction on COD removal efficiency

Fig. 7 3D surface and contour showing effects of aeration rate, iron-carbon rate and interaction on COD removal efficiency
Fig. 7 3D surface and contour showing effects of aeration rate, iron-carbon rate and interaction on COD removal efficiency

Fig. 8 3D surface and contour showing effects of pH, iron-carbon rate and interaction on COD removal efficiency
Fig. 8 3D surface and contour showing effects of pH, iron-carbon rate and interaction on COD removal efficiency
