| Acknowledgement |
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vii | |
| Summary |
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ix | |
| Samenvatting |
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xi | |
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xiii | |
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Chapter 1 General Introduction |
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1 | (12) |
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1.1 Background of the study |
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2 | (1) |
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1.2 The Kaduna Refining and Petrochemical Company (KRPC), Kaduna |
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3 | (1) |
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4 | (1) |
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1.4 Research objectives of the thesis |
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5 | (1) |
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5 | (1) |
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1.4.2 Specific objectives |
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5 | (1) |
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6 | (1) |
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1.6 Significance of the study |
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6 | (2) |
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1.7 Outline of the thesis |
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8 | (1) |
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9 | (4) |
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Chapter 2 Constructed wetlands to treat wastewater generated in conventional petroleum refining industry: a review |
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13 | (58) |
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Abbreviations and notations |
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15 | (1) |
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16 | (7) |
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2.1.1 Petroleum refining wastewater types |
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16 | (2) |
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2.1.2 Petroleum contaminants |
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18 | (5) |
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2.2 Constructed wetlands for treatment of petroleum refining wastewater |
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23 | (15) |
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2.2.1 Conventional treatment technologies |
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23 | (1) |
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2.2.2 Constructed wetland design |
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24 | (14) |
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2.3 Removal pathways in constructed wetlands |
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38 | (3) |
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2.4 Components of constructed wetland treatment |
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41 | (8) |
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2.4.1 The macrophyte component |
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41 | (4) |
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45 | (3) |
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2.4.3 Role of substrate media of constructed wetlands |
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48 | (1) |
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2.5 Capital, operation and maintenance costs |
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49 | (1) |
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50 | (1) |
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51 | (1) |
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51 | (20) |
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Chapter 3 Characterization of secondary treated refinery effluent |
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71 | (20) |
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73 | (2) |
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3.1.1 Petroleum effluents |
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73 | (2) |
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3.2 Materials and methods |
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75 | (3) |
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3.2.1 Description of experimental study site |
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75 | (1) |
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3.2.2 Physical and chemical quality characterization |
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75 | (2) |
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77 | (1) |
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78 | (5) |
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3.3.1 Characterization of secondary refinery wastewater |
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78 | (1) |
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3.3.2 Heavy metal concentrations in secondary refinery wastewater |
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79 | (1) |
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3.3.3 Special organic contaminant concentrations in secondary refinery wastewater |
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79 | (1) |
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80 | (3) |
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83 | (2) |
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3.4.1 Implication of the discharge of secondary treated refinery wastewater into the environment |
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83 | (1) |
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3.4.2 Heavy metal content in the secondary oil refinery wastewater |
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84 | (1) |
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3.4.3 Organic contaminants |
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85 | (1) |
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85 | (1) |
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85 | (1) |
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86 | (5) |
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Chapter 4 Vertical subsurface flow constructed wetlands for polishing secondary Kaduna refinery wastewater in Nigeria |
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91 | (22) |
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93 | (1) |
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4.2 Materials and methods |
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94 | (4) |
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4.2.1 Description of experimental study site |
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94 | (1) |
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4.2.2 Refinery effluent sampling |
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95 | (1) |
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4.2.3 Constructed wetland design and operation |
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95 | (1) |
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4.2.4 Bacteriological sampling and analysis |
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96 | (2) |
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98 | (1) |
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98 | (7) |
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4.3.1 Treatment efficiencies of the VSF - CWs |
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98 | (2) |
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4.3.2 Properties of bacterial isolates in wastewater, gravel and root media |
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100 | (5) |
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105 | (1) |
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4.4.1 Vertical subsurface flow CW for petroleum secondary effluent treatment |
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105 | (1) |
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4.4.2 Bacteriological analysis of subsurface flow constructed wetlands |
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106 | (1) |
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106 | (1) |
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107 | (1) |
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107 | (6) |
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Chapter 5 Optimization of petroleum refinery wastewater treatment by vertical flow constructed wetlands under tropical conditions: plant species selection and polishing by a horizontal flow constructed wetlands |
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113 | (34) |
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115 | (2) |
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5.2 Materials and methods |
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117 | (4) |
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5.2.1 Description of experimental study site |
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117 | (1) |
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5.2.2 Experimental design |
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117 | (2) |
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119 | (1) |
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5.2.4 Monitoring the growth of Typha latifolia in VSSF and HSSF CWs |
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119 | (1) |
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120 | (1) |
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5.2.6 Performance of constructed wetlands based on mass balance calculations |
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120 | (1) |
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121 | (12) |
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5.3.1 Growth of Typha latifolia in wetlands treating secondary refinery wastewater |
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121 | (1) |
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5.3.2 Physicochemical wastewater parameters |
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122 | (1) |
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122 | (2) |
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5.3.4 Total suspended solids |
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124 | (1) |
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5.3.5 Biological and chemical oxygen demand |
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125 | (2) |
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5.3.6 Nitrogenous compounds |
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127 | (2) |
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129 | (1) |
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5.3.8 Relationship between organic mass loading rates and mass removal rates |
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130 | (2) |
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5.3.9 HSSF CW (Stage 2) of the hybrid treatment systems |
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132 | (1) |
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133 | (5) |
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5.4.1 Efficiency of the VSSF-HSSF CWs in improving the quality of the secondary refinery effluent |
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133 | (3) |
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5.4.2 Role of T. latifolia planted VSSF CWs in the optimization of the treatment system |
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136 | (1) |
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5.4.3 Removal efficiency of the HSSF C W treatment systems |
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137 | (1) |
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5.4.4 Performance of T. latifolia in the VSSF-HSSF CWs |
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138 | (1) |
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5.4.5 Physicochemical wastewater characteristics |
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138 | (1) |
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138 | (1) |
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139 | (1) |
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139 | (8) |
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Chapter 6 Fate of heavy metals in vertical subsurface flow constructed wetlands treating secondary treated petroleum refinery wastewater in Kaduna, Nigeria |
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147 | (26) |
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149 | (1) |
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6.2 Materials and methods |
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150 | (3) |
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6.2.1 Experimental design |
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150 | (1) |
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6.2.2 Water and plant sampling |
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151 | (1) |
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151 | (1) |
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6.2.4 Treatment efficiency of vertical subsurface flow constructed wetlands |
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152 | (1) |
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6.2.5 Bioaccumulation factor in plant parts |
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152 | (1) |
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6.2.6 Translocation factor |
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152 | (1) |
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153 | (3) |
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6.3.1 Heavy metal removal from the refinery wastewater |
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153 | (2) |
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6.3.2 Plant height and shoots |
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155 | (1) |
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6.3.3 Plant contribution to heavy metal removal in VSF-CWs |
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155 | (1) |
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6.3.4 Heavy metal concentrations, translocation and bioaccumulation in plant parts |
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156 | (1) |
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156 | (10) |
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6.4.1 Heavy metal removal from secondary refinery wastewater by VSF-CWs |
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156 | (5) |
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6.4.2 Relationship between heavy metal removal by plants and removal by VSF-CWs |
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161 | (1) |
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6.4.3 Bioaccumulation and translocation of metals in wetland plants |
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162 | (4) |
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166 | (1) |
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166 | (1) |
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166 | (7) |
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Chapter 7 Vertical subsurface flow constructed wetlands for the removal of petroleum contaminants from secondary refinery effluent at the Kaduna refining and petrochemical company (Kaduna, Nigeria) |
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173 | (28) |
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175 | (1) |
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7.2 Materials and methods |
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176 | (5) |
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176 | (2) |
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178 | (1) |
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178 | (2) |
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180 | (1) |
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181 | (8) |
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7.3.1 Physicochemical parameters of VSF CW influent and effluent |
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181 | (1) |
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7.3.2 Removal of TSS and COD |
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182 | (1) |
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7.3.3 Petroleum contaminant removal |
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183 | (1) |
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7.3.4 Nutrient removal by VSF CW |
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184 | (1) |
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7.3.5 Growth of Typha latifolia in the VSF CW |
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185 | (1) |
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7.3.6 Concentration of contaminants in Typha latifolia tissue |
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186 | (2) |
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7.3.7 Bioaccumulation and translocation factors |
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188 | (1) |
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189 | (5) |
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7.4.1 Performance of constructed wetlands for treatment of petroleum contaminants |
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189 | (2) |
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7.4.2 Bioaccumulation and translocation of petroleum contaminants in plant parts |
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191 | (1) |
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7.4.3 CW effluent quality: TSS and COD |
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192 | (1) |
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7.4.4 CW effluent quality: physicochemical parameters |
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193 | (1) |
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194 | (1) |
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195 | (1) |
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195 | (6) |
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Chapter 8 Performance evaluation of duplex constructed wetlands for the treatment of diesel contaminated wastewater |
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201 | (36) |
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203 | (2) |
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205 | (5) |
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205 | (2) |
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8.2.2 Preparation of synthetic diesel refinery oil effluent |
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207 | (1) |
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8.2.3 Wastewater sampling and analysis |
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207 | (1) |
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8.2.4 Numerical Experiments |
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208 | (2) |
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210 | (11) |
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8.3.1 Water quality parameters |
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210 | (1) |
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210 | (11) |
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221 | (8) |
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8.4.1 Constructed wetlands for treatment of diesel contaminated wastewater |
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221 | (3) |
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8.4.2 Single stage versus hybrid CW system |
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224 | (3) |
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8.4.3 Effect of nutrient addition on duplex-CW performance |
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227 | (1) |
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8.4.4 Physical-chemical characteristics of secondary refinery wastewater |
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228 | (1) |
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229 | (1) |
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229 | (1) |
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229 | (8) |
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Chapter 9 General discussion and outlook |
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237 | (34) |
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238 | (1) |
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9.2 Petroleum refinery wastewater characterization |
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239 | (7) |
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9.3 Wastewater treatment by constructed wetlands |
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246 | (7) |
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9.3.1 Vertical subsurface flow constructed wetlands (VSSF CWs) |
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247 | (1) |
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248 | (2) |
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9.3.3 Hybrid constructed wetlands |
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250 | (3) |
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9.4 Implications for application by petroleum refining industry |
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253 | (1) |
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9.5 Scaling up of constructed wetland for treating petroleum refinery effluent |
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254 | (9) |
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254 | (5) |
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9.5.2 Operation and maintenance |
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259 | (3) |
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9.5.3 Cost implication for siting a subsurface flow constructed wetland to polish the secondary treated Kaduna refinery wastewater |
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262 | (1) |
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9.6 Outlook: Application of constructed wetland treatment technology to KRPC effluent |
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263 | (1) |
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263 | (8) |
| Appendix |
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271 | (4) |
| List of publications |
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275 | (1) |
| Conference Proceeding |
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276 | (2) |
| About the author |
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278 | (1) |
| Acknowledgements of financial support |
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279 | |