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Pollution problems and an engineering approach to the management and control of industrial effluents in otta, nigeria

 

Table Of Contents


<p> </p><p>CERTIFICATION – – – – – – &nbsp; ii<br>ACKNOWLEDGEMENT – – – – – &nbsp; iv<br>DEDICATION – – – – – – &nbsp; vii<br>TABLE OF CONTENTS – – – – – – viii<br>LIST OF TABLES – – – – – – &nbsp; xiv<br>LIST OF FIGURES – – – – – – &nbsp; xvi<br>LIST OF PLATES – – – – – – xviii<br>LIST OF ACRONYMS – – – – – – &nbsp; xix<br>ABSTRACT – – – – – – – &nbsp; xxii<br><b><br>

Chapter ONE

– – – – – – &nbsp; 1<br>1 INTRODUCTION – – – – – – &nbsp; 1</b><br>11 Background to the Study – – – – – &nbsp; 1<br>12 Statement of the Problem – – – – – &nbsp; 1<br>13 Aims of the Research – – – – – &nbsp; 2<br>14 Specific Objectives of the Study – – – – &nbsp; 2<br>15 Justification for the Research – – – – &nbsp; 3<br>16 Scope of the Study – – – – – – &nbsp; 3<br>17 Delimitation of the Study – – – – – &nbsp; 3<br>18 Operational Definition of Terms – – – – &nbsp; 4<br>19 Expected Result and Contribution to Knowledge – – – &nbsp; 8<br>191 Expected Results – – – – – – &nbsp; 8<br>192 Expected Contributions to Knowledge – – – – &nbsp; 8</p><p><b>

Chapter TWO

– – – – – – &nbsp; 10<br>2 LITERATURE REVIEW – – – – – &nbsp; 10</b><br>21 Water Quality and Pollution Problems – – – &nbsp; 10<br>211 Water Quality – – – – – – 10<br>212 Pollution Problems – – – – – – 11<br>213 Causes of Water Pollution – – – – – 11<br>214 Sources and Effects of Water Pollution – – – – 13<br>22 Receiving Environment Characteristics – – – –</p><p>&nbsp; 14<br>221 Assimilative Capacity of the Receiving Water – – – 15<br>222 Views on Global Water Quality – – – – 16<br>23 Water Quality in Nigeria – – – – – &nbsp; 18<br>24 Historical Development of Hydrodynamic Systems – – – &nbsp; 20<br>25 Historical Development of Water Quality Models – – &nbsp; 21<br>251 Early Modeling Works – – – – – 21<br>26 Water Quality Standards – – – – – &nbsp; 29<br>27 Hydrodynamics and Hydraulics – – – – – &nbsp; 31<br>271 Hydraulic Routing Techniques – – – – – 34<br>272 1-Dimensional Equation of Motion – – – – 37<br>273 2-Dimensional Equations of Motion – – – – 41<br>274 3-Dimensional Equations of Motion – – – – 43<br>28 Numerical Solution Techniques – – – – – &nbsp; 45<br>281 Finite Difference Solution Method – – – – 46<br>2811 Explicit Finite Differences – – – – – – 47<br>2812 Implicit Finite Differences – – – – – – 48<br>282 Finite Element Solution Method – – – – 49<br>29 Conceptual Framework of Water quality model – – – &nbsp; 51<br>210 Review of Available, Applicable Hydrodynamic and Water Quality Models<br>&nbsp; – – – – – – – &nbsp; 55<br>2101 Water Quality Analysis Simulation Program – – – – 55<br>2102 Hydrodynamic and Water Quality Model Selection – – – 56<br>2103 Case Studies Utilizing DYNHYD and WASP Modeling Software – – 57<br>2104 QUAL2E (The Enhanced Stream Water Quality Model) – – 57<br>21041 The Scope and Components of QUAL2E – – – – 58<br>211 QUAL2K Input File Generation – – – – &nbsp; 60<br>2111 Dissolved Oxygen – – – – – – 60<br>2112 Model Framework and Scientific Details – – – – 62<br>21121 Model Inputs – – – – – – 63<br>21122 Model Outputs – – – – – – – 64<br>2113 Transport Processes – – – – – 64<br>2114 Conversion Processes – – – – – – 66</p><p><b>

Chapter THREE

– – – – – – &nbsp; 67<br>3 RESEARCH METHODOLOGY: Materials and Methods – – &nbsp; 67</b><br>31 The Research Design – – – – – &nbsp; 67<br>311 Design Brief Formulation – – – – – 67<br>312 Survey Approach and Survey Instrument – – – – 69<br>32 Study Site – – – – – – &nbsp; 73<br>321 Survey of Industries – – – – – – 73<br>322 Determination of pollutant sources, types and quantities – – – 74<br>33 Sampling Techniques – – – – – &nbsp; 74<br>34 Field Sampling and Analyses – – – – &nbsp; 77<br>341 Site Characterization Studies – – – – – 78<br>342 Method of Sample Collection – – – – – 78<br>35 Laboratory Test Studies and Pilot â“ Scale Studies – – &nbsp; 79<br>36 Engineering Model Design and Pilot â“Scale Studies (Modeling, Simulation<br>and Treatability Studies) – – – – – &nbsp; 80</p><p><b>

Chapter FOUR

– – – – – – &nbsp; 82<br>4 MODEL APPLICATION TO RIVER ATUWARA – – – &nbsp; 82</b><br>41 Model Study Area: Atuwara River, Ogun State Nigeria – – &nbsp; 82<br>411 River Atuwara Origin and Course – – – – 83<br>412 River Atuwara: Geology, Climate and Hydrology – – – 84<br>413 Vegetation, Agriculture and Hunting – – – – 89<br>414 Human Population – – – – – – 89<br>415 Uses of the River Atuwara – – – – – 92<br>4151 Irrigation – – – – – – – 92<br>4152 Fisheries and Livestocks – – – – – 92<br>4153 Recreation around the Watershed – – – – – 92<br>416 Industry along River Atuwara – – – – – 93<br>4161 Industrial Polluants – – – – – – 93<br>42 Data Collection and Processing – – – – &nbsp; 102<br>421 Flow Types – – – – – – – 102<br>4211 Low Flow Analysis: Flow and Pollution Loads – – – – 102<br>4212 Oxygen Reaeration Formulae: Internal Calculation of the Reaeration Ratio – 103<br>422 Channel and Flow Data – – – – – 104<br>4221 Flow Data – – – – – – – 104<br>4222 Instantaneous Release – – – – – – 105<br>4223 Continuous Release – – – – – – 106<br>4224 Biological Decay – – – – – – 107<br>423 Hydrodynamics Predictions – – – – – 107<br>424 Continuous Variable Hydrodynamics – – – – 108<br>425 Hydro- geometric Data – – – – – 108<br>43 Condition for Simulation with QUAL2K – – – &nbsp; 111<br>431 Mass Balance – – – – – – 115<br>432 QUAL2K Calibration – – – – – 116<br>433 Reaction Rate Constants – – – – – 117<br>434 Flow and Pollution Loads – – – – – 117<br>435 How QUAL2K Obtain Solutions Numerically – – – 117<br>436 Model Configuration/Model Segmentation – – – – 121<br>437 Model Parameters – – – – – – 121<br>4371 Initial Condition Based on Observation from Atuwara River Watershed – 125<br>4372 Initial Condition Based on Best Professional Judgment – – – 125<br>438 Model Loading Rates/Endpoint Identification – – – 127<br>439 Reaeration rate constants – – – – – 129<br>4310 BOD Loadings, Concentrations and Rates – – – – 130<br>43101 BOD Removal Rates – – – – – 133<br>43102 Settling – – – – – – – 133<br>43103 Bed Effects – – – – – – 134<br>4311 QUAL2K APPLICATION – – – – – 136<br>44 Application of GIS to River Atuwara Watershed/Study Area – – &nbsp; 139<br>45 Measurement of Contamination from Industrial Discharge by GIS – &nbsp; 141<br>46 SUMMARY OF RESULTS – – – – &nbsp; 142</p><p><b>

Chapter FIVE

– – – – – – – &nbsp; 171<br>5 EFFLUENT TREATABILITY STUDIES – – – &nbsp; 171</b><br>51 INTRODUCTION – – – – – &nbsp; 171<br>52 Analytical methods – – – – – &nbsp; 173<br>53 Materials and Methods – – – – – &nbsp; 174<br>54 Experimental Results and Discussion – – – &nbsp; 177<br>55 Uses of Activated Carbon for Effluents Treatment – – – &nbsp; 181</p><p><b>CHAPTER SIX – – – – – – &nbsp; 185<br>6 DISCUSSIONS OF RESULTS, SUMMARY AND FUTURE DIRECTIONS-185</b><br>61 Research Finding and Discussion – – – – &nbsp; 185<br>62 Summary of Hydrodynamics Model Results – – – &nbsp; 188<br>63 Summary of QUAL2K Model Results – – – – &nbsp; 188<br>64 Treatability Studies Results – – – – – &nbsp; 189<br>65 Research Contribution to knowledge – – – – &nbsp; 190<br>66 Future Directions in River Modeling in Nigeria – – – &nbsp; 192</p><p><b>CHAPTER SEVEN – – – – – – &nbsp; 194<br>7 RESEARCH CONCLUSIONS AND RECOMMENDATIONS – – &nbsp; 194</b><br>71 Research Conclusions – – – – – &nbsp; 194<br>711 The Model Software – – – – – – 194<br>712 Location Description – – – – – 195<br>713 Water Quality Standard for all Assessment Units in this Research – – 195<br>714 Priority Pollutants along the Atuwara Watershed – – – 198<br>72 Recommendations – – – – – &nbsp; 202</p><p><b>REFERENCES – – – – – – &nbsp; 205<br>APPENDIX A – – – – – – &nbsp; 220<br>WATER QUALITY COMPONENTS – – – – &nbsp; 220<br>APPENDIX B – – – – – – &nbsp; 223<br>THE RESEARCH QUESTIONNAIRES – – – – &nbsp; 223<br>Industrial Assessment Form – – – – – &nbsp; 225<br>APPENDIX C – – – – – – &nbsp; 233<br>TABLES UTILIZED FOR MODEL SELECTION – – – &nbsp; 233<br>APPENDIX D – – – – – – &nbsp; 241</b></p><p>SECTORAL GROUPING OF ADO ODO /OTTA INDUSTRIES – – &nbsp; 241<br>Sector A: Food, Beverages &amp; Tobacco – – – – &nbsp; 241<br>Sector B : Chemical &amp; Pharmaceuticals – – – – &nbsp; 242<br>Section C: Domestic &amp; Industrial Plastics, Rubber &amp; Foam – – &nbsp; 243<br>Sector D: Basic Metal, Iron, Steel &amp; Fabricated Metal Products – – &nbsp; 244<br>Sector E: Pulp Paper &amp; Paper Products; Printing &amp; Publishing – – &nbsp; 245<br>Sector F: Electrical And Electronics – – – – &nbsp; 245<br>Sector G: Wood &amp; Wood Products Furniture – – – &nbsp; 245<br>Sector H: Non Metallic Mineral Products – – – – &nbsp; 246<br><b><br>APPENDIX E – – – – – – &nbsp; 247</b><br>INDUSTRIAL EFFLUENT DATA – – – – &nbsp; 247<br>The General Food and Beverages Industry – – – &nbsp; 262<br>Generation of Liquid Wastes in Industries – – – &nbsp; 264<br>Generation of Hazardous Wastes – – – – – &nbsp; 266<br><b><br>LIST OF TABLES</b><br>Table 21: Development Periods of Water Quality Models (Chapra, 1997) – &nbsp; 26<br>Table 22: Abbreviated List of Water Quality Models with Reference – – &nbsp; 28<br>Table 23: Stokesâs Settling Velocities (in m/day) at 20°C – – – &nbsp; 33<br>Table 31: Location of the 10 Sector Industries – – – &nbsp; 70<br>Table 32: Outline of a generalized sampling protocol – – – &nbsp; 76<br>Table 41: Ranges of discharge coefficients and exponents – – &nbsp; 116<br>Table 42 Average values and ranges of exponents in hydro geometric correlations<br>– – – – – – – &nbsp; 120<br>Table 43 Water Quality Calibration Rates and Coefficients – – &nbsp; 126<br>Table 44 Typical Values for the ratio of 5=day to ultimate BOD – – &nbsp; 132<br>Table 45: Typical loading rates for untreated domestic sewage – – – &nbsp; 132<br>Table 46 &nbsp; Model reaches Delineation – – – – &nbsp; 137<br>Table 47: October 14, 2008 Atuwara Rivers Model Water Quality Input Data – &nbsp; 142<br>Table 48: October 14, 2008 Atuwara Rivers Statistical Summary of Analytical Data<br>– – – – – – – &nbsp; 143<br>Table 49: October 14, 2008 Atuwara Rivers Field Measured Hydrogeometric<br>Parameters – – – – – – &nbsp; 144<br>Table 410: October 14, 2008 Atuwara River Water Quality Model Loading Rates 148<br>Table 411: February 17, 2009 Atuwara Rivers Model Water Quality Input Data – &nbsp; 149<br>Table 412: February 17, 2009 Atuwara Rivers Statistical Summary of Analytical<br>Data – – – – – – – &nbsp; 150<br>Table 414: February 17, 2009 Atuwara River Water Quality Model Loading Rates<br>– – – – – – – &nbsp; 155<br>Table 415: March 18, 2009 Atuwara Rivers Model Water Quality Input Data – &nbsp; 156<br>Table 416: March 18, 2009 Atuwara Rivers Statistical Summary of Analytical Data<br>– – – – – – – &nbsp; 157<br>Table 417: March 18, 2009 Atuwara Rivers Field Measured Hydrogeometric<br>Parameters – – – – – – &nbsp; 158<br>Table 418: March 18, 2009 Atuwara River Water Quality Model Loading Rates – &nbsp; 162<br>Table 419: May 11, 2009 Atuwara Rivers Model Water Quality Input Data – &nbsp; 163<br>Table 420: May 11, 2009 Atuwara Rivers Statistical Summary of Analytical Data 164<br>Table 421: May 11, 2009 Atuwara Rivers Field Measured Hydrogeometric<br>Parameters – – – – – – &nbsp; 165<br>Table 422: May 11, 2009 Atuwara River Water Quality Model Loading Rates – &nbsp; 170<br>Table 51 Energy Variation of Electro-Fenton Experiments – – &nbsp; 180<br>Table 52Characteristics of effluents treatment by Electro- Fenton<br>– – – – – – – &nbsp; 180<br>Table 53 Specification of Quality and Use of Granular Activated Carbon – &nbsp; 183<br>Table 54 Result of Effluents Treatment with both Electro – Fenton and GAC BBC<br>945 – – – – – – – &nbsp; 184<br>Table 71: Individual Reach Description: Summary of River Atuwara Watershed<br>Impairment addressed in this research – – – – &nbsp; 201<br>Table C1 &nbsp; Water Quality Model Comparison Matrix – – – &nbsp; 233<br>Table C1 &nbsp; Water Quality Model Comparison Matrix (Contd) – – – &nbsp; 235<br>Table C1 &nbsp; Water Quality Model Comparison Matrix (Contd) – – – &nbsp; 236<br>Table C1 Water Quality Model Comparison Matrix (Contd) – – &nbsp; 237<br>Table C1 &nbsp; Water Quality Model Comparison Matrix (Contd) – – – &nbsp; 238<br>Table C1 &nbsp; Water Quality Model Comparison Matrix (Contd) – – – &nbsp; 239<br>Table E1: Water Quality Analysis of Selected Industries in Ado â“ Odo Otta – &nbsp; 247<br>Table E2: Water Quality Analysis of Selected Industries in Ado â“ Odo Otta and Lagos<br>– – – – – – – &nbsp; 249<br>Table E3: Water Quality Trends in Selected Receiving Water Bodies from 1980 â“<br>1997 – – – – – – – &nbsp; 251<br>Table E4: Industrial Sub-Sectoral Types, Raw Materials, Products &amp; Waste<br>Characterization – – – – – – &nbsp; 252<br>Table E5: Volume of Wastewater Produced by Some Industrial Sector – – &nbsp; 261<br>Table E6: Characteristic of Typical Brewery and Distillery Wastewater – – &nbsp; 262<br>Table E7: Volume of Wastewater Produced by Some Industrial Sector – – &nbsp; 265<br>Table E8: Source and Types of Hazardous Waste in Some Industries – – &nbsp; 267</p><p><b>&nbsp;LIST OF FIGURES</b><br>Fig 21 An urban waterâ”wastewater system – – – – &nbsp; 22<br>Fig22: Schematic of water quality model used for a typical River Estuary – &nbsp; 53<br>Fig23 Schematic description of the water quality model QUAL2E – – &nbsp; 66<br>Figure 31 Map of Otta District, Ogun State Nigeria – – – &nbsp; 72<br>Figure 41: General Layout of the Study Area – – – – &nbsp; 86<br>Figure 42: River Atuwara Watershed – – – – &nbsp; 87<br>Figure 43: River Atuwara Watershed and Built-up Areas – – – &nbsp; 91<br>Figure 44: River Atuwara and Industrial Locations – – – &nbsp; 95<br>Figure 45: River Atuwara Wetland and Sampling Points – – – &nbsp; 101<br>Figures 46 Cross â“ Section of the basin to calculate other parameters – – &nbsp; 113<br>Fig 47: Computational Grid Set – Up – – – – &nbsp; 123<br>Figure 48 Location Map showing sampling Points and Tributaries – – &nbsp; 124<br>Figure 49a Total removal rate versus stream depth for BOD that is 50% in settleable<br>form &nbsp; – – – – – – &nbsp; 135<br>Figure 49b In â“ Stream decomposition rate versus depth ( Bowie et al ,1985) – &nbsp; 135<br>Figure 410: October 14, 2008 Atuwara River Dissolved Oxygen Vs River Flow<br>Model &nbsp; Predictions – – – – – &nbsp; 145<br>Figure 411: October 14,2008 Atuwara River CBOD Vs River Flow Model<br>Predictions – – – – – – &nbsp; 145<br>Figure 412: October 14, 2008 Atuwara River CBOD and Model Predictions – &nbsp; 146<br>Figure 413: October 14, 2008 Atuwara River CBOD, DO and Model Predictions &nbsp; 146<br>Figure 414: October 14 2008 Atuwara River CBOD, Vs SOD Model Predictions &nbsp; 147<br>Figure 415: October 14, 2008 Atuwara River TBODu, Vs SOD Model Predictions<br>– – – – – – – &nbsp; 147<br>Figure 416: February 17 2009, Atuwara River Dissolved Oxygen Vs River Flow<br>Model Predictions – – – – – – &nbsp; 152<br>Figure 417: February 17, 2009 Atuwara River CBOD Vs River Flow Model<br>Predictions – – – – – – &nbsp; 152<br>Figure 418: February 17, 2009 Atuwara River CBOD and Model Predictions – &nbsp; 153<br>Figure 419: February 17, 2009 Atuwara River CBOD, DO and Model Predictions 153<br>Figure 420: February 17, 2009 Atuwara River CBOD, Vs SOD Model Predictions<br>– – – – – – – &nbsp; 154<br>Figure 421: February 17, 2009 Atuwara River TBODu, Vs SOD Model Predictions<br>– – – – – – – &nbsp; 154<br>Figure 422: March 18, 2009 Atuwara River Dissolved Oxygen Vs River Flow Model<br>Predictions – – – – – – &nbsp; 159<br>Figure 423: March 18, 2009 Atuwara River CBOD Vs River Flow Model Predictions<br>– – – – – – – &nbsp; 159<br>Figure 424: March 18, 2009 Atuwara River CBOD and Model Predictions – &nbsp; 160<br>Figure 1425: March 11, 2009 Atuwara River CBOD, DO and Model Predictions &nbsp; 160<br>Figure 426: March 18, 2009 Atuwara River CBOD, Vs SOD Model Predictions – &nbsp; 161<br>Figure 427: March 18, 2009 Atuwara River TBODu, Vs SOD Model Predictions &nbsp; 161<br>Figure 428: May 11, 2009 Atuwara River Dissolved Oxygen Vs River Flow Model<br>Predictions – – – – – – &nbsp; 166<br>Figure 429: May 11, 2009 Atuwara River CBOD Vs River Flow Model Predictions<br>– – – – – – – &nbsp; 166<br>Figure 430: May 11, 2009 Atuwara River CBOD and Model Predictions – &nbsp; 167<br>Figure 431: May 11, 2009 Atuwara River CBOD, DO and Model Predictions – &nbsp; 167<br>Figure 432: May 11, 2009 Atuwara River CBOD, Vs SOD Model Predictions – &nbsp; 168<br>Figure 433: May 11, 2009 Atuwara River TBODu, Vs SOD Model Predictions – &nbsp; 169<br>Figure 51 Electro â“Fenton Experimental Set â“ up – – – &nbsp; 176<br>Figure 71: Improved activated carbon Bed – – – – &nbsp; 199</p><p><b>LIST OF PLATES</b><br>PLATE I River Atuwara and Iju Villagers – – – – &nbsp; 94<br>PLATE II River Atuwara soon recovers after receiving effluents from a Food<br>Processing Firm – – – – – – &nbsp; 94<br>PLATE IIIA truck discharging combined effluents into River Atuwara at Ekusere<br>– – – – – – – &nbsp; 98<br>PLATE IV Abattoir on River Atuwara upper boundary at Owode â“ Ijako along<br>Lagos Abeokuta Expressway – – – – – &nbsp; 98<br>PLATE V River Atuwara upper boundary at Owode â“ Ijako along Lagos<br>Abeokuta Expressway – – – – – &nbsp; 99<br>PLATE VI River Aturwara receiving solid wastes from the environment – &nbsp; 99<br>PLATE VIISampling from Distilleries effluents along River Atuwara Watershed<br>– – – – – – – &nbsp; 100<br>PLATE VIII Distilleries effluents cascading into River Atuwara – – &nbsp; 100<br>PLATE IX Hydrogeometric Measurement on River Atuwara – – &nbsp; 110<br>PLATE X Hydrogeometric Measurement at Iju Water Works lower down stream &nbsp; 110<br>PLATE XI Laboratory Bench Scale Electro â“Fenton Experimental set – up – &nbsp; 178<br>PLATE XII Running the Laboratory Bench â“ Scale Electro Fenton Experiment &nbsp; 178<br>PLATE XIII Measuring water quality parameters from Laboratory Bench- Scale<br>Electro â“ Fenton Experiment – – – – &nbsp; 179</p><p><b>&nbsp;LIST OF ACRONYMS</b><br>BOD &nbsp; &nbsp; Biochemical Oxygen Demand<br>CBOD &nbsp; &nbsp; Carbonaceous Biochemical Oxygen Demand &nbsp;<br>CE-QUAL-ICM &nbsp; Three-Dimensional Eutrophication Model<br>CE â“QUAL-W2 &nbsp; Two â“ Dimensional, Laterally-Averaged Hydrodynamic and<br>Water Quality Model<br>COD Chemical Oxygen Demand &nbsp;<br>DO &nbsp; &nbsp; &nbsp; Dissolved Oxygen &nbsp;<br>DYNHYD &nbsp; Link Node Tidal Hydrodynamic Model<br>EFDC &nbsp; &nbsp; Environmental Fluid Dynamics Code &nbsp;<br>FEPA &nbsp; &nbsp; &nbsp; Federal Environmental Protection Agency<br>GIS &nbsp; &nbsp; Geographic Information Systems &nbsp;<br>GPS &nbsp; &nbsp; Global Positioning System &nbsp;<br>HEM-3D &nbsp; &nbsp; Three-Dimensional Hydrodynamic-Eutrophication Model &nbsp;<br>HM &nbsp; &nbsp; Heavy Metals<br>HSPF &nbsp; &nbsp; Hydrologic Simulation Program â“ FORTRAN &nbsp;<br>IPP &nbsp; &nbsp; Integrated Product Policy<br>MAN &nbsp; &nbsp; Manufacturers Association of Nigeria &nbsp;<br>MEDLI &nbsp; &nbsp; Model for Effluent Disposal using Land Irrigation<br>MEPP &nbsp; &nbsp; Ministry of Environment and Physical Planning<br>NBOD &nbsp; &nbsp; Nitrogenous Biochemical Oxygen Demand<br>NH3-N &nbsp; &nbsp; &nbsp; Ammonia-nitrogen &nbsp;<br>NMS &nbsp; &nbsp; National Minimum Standards<br>NPES &nbsp; &nbsp; &nbsp; National Pollutant Discharge Elimination System<br>OGEPA &nbsp; Ogun State Environmental Protection Agency<br>OPO4 &nbsp; &nbsp; Ortho-Phosphorus or Inorganic Phosphorus &nbsp;<br>QUAL2E &nbsp; Enhanced Stream Water Quality Model &nbsp;<br>QUAL2K &nbsp; Enhanced Stream Water Quality Model (Improved)<br>RIVMOD-H &nbsp; &nbsp; River Hydrodynamics Model and &nbsp;<br>SBR &nbsp; &nbsp; Sequencing Batch Reactors<br>SOD &nbsp; &nbsp; Sediment Oxygen Demand<br>TBOD &nbsp; &nbsp; Total Biochemical Oxygen Demand<br>TDS &nbsp; &nbsp; Total Dissolved Solids<br>TMDL &nbsp; &nbsp; Total Maximum Daily Load<br>TOC &nbsp; &nbsp; &nbsp; Total Organic Carbon &nbsp;<br>TPWQM &nbsp; Tidal Prism Water Quality Model &nbsp;<br>TSS &nbsp; &nbsp; Total Suspended Solids<br>TVA &nbsp; &nbsp; Tennessee Valley Authority &nbsp;<br>UNESCO United Nations Educational, Scientific and Cultural<br>Organization<br>USEPA &nbsp; &nbsp; &nbsp; United States Environmental Protection Agency<br>USGS &nbsp; &nbsp; United State Geological Survey<br>WASP Water Quality Analysis Simulation Programme Water Quality<br>Model Developed by USEPA<br>WES &nbsp; &nbsp; World Environmental Systems &nbsp;<br>WHO &nbsp; &nbsp; &nbsp; World Health Organization &nbsp;<br>WTP &nbsp; &nbsp; Water Treatment Plant &nbsp;<br>WWTP &nbsp; &nbsp; Wastewater Treatment Plant </p> <br><p></p>

Thesis Abstract

<p> This study examined the effects of effluent discharges from various point-loads on a purposively selected receiving river, the self-recovery ability of the river and the<br>treatability of both the discharges and the receiving stream in a heavily industrialized<br>community. The work involved field survey of industries producing and discharging effluents in the study area (Ado Odo/ Otta industrial zone of Ogun State, Nigeria); determination<br>of the effluentsâ physico â“ chemical, biological and microbial characteristics, and the<br>impact of the discharged effluents on the receiving surface water using standard methods. Primary data were also collected for analysis using structured questionnaires and oral interviews to elicit the contribution of the industries to water pollution. To advance analytical process various scenarios of improving water quality along the river under study were examined. An array of computer based hydrogeometric and water quality models were investigated. QUAL2K was operated as a one-dimensional steady state and completely mixed system for hydrogeometric and water quality analysis on the Atuwara River. The 10.81 km long stretch from upstream at Owode â“ Ijako to Iju Water Works was mapped with geographical positioning systems (GPS) and divided into 7 reaches with further segmentation of 0.3 km each from where grab samples were collected routinely throughout the study period. The research analyzed the effluent discharges from all industries along the river for priority pollutants such as BOD, COD, TDS, TSS, and Heavy metals using standard methods. The effluent samples were obtained and compared with river water samples before and after receiving waste loads in the dry and wet seasons. Model result was interfaced with geographical information systems (GIS) for clear display of model outcome to demarcate polluted zones, limnographic points and wetlands of the Atuwara watershed. The worst scenario of the effluent samples were obtained for laboratory-scale treatability studies by applying electro â“ Fenton alone or with further treatment by Granulated Activated Carbon (GAC) type BBC 945 to properly remove traces of heavy metals.<br>The result showed that the effluents were acidic in both seasons with range between pH 5.4 – 6.7. The BOD and COD concentration were also very high especially at immediate downstream of points of discharge. The level of dissolved oxygen (DO) attained at points of discharge remain anoxic with the DO gradually increasing at short distances downstream to each discharge point but much higher where tributaries discharge into the river under study. The assimilative capacity of the river is very high because of the contribution from the tributaries. Calculated worst scenario of BOD discharge was about 12 metric tonnes per day. The heavy metals (cadmium, lead and iron) were slightly above the FEPA standard at all sections of the river. All these indicated that the river is impaired and should be declared polluted and not good for human consumption without adequate treatment.<br>The study showed that the Atuwara River was grossly polluted. Treatment of the worst scenario effluent collected from an industry showed that COD removal of more than 66% was achieved with electro-Fenton treatment at a molar ratio of H2O2/Fe2+ between 150-250, using 0.3M H2O2 and 0.002M Fe2+ and when further treated with the GAC 945 sample, the COD removal was 86%. To achieve river water quality specified by regulatory authorities, it is therefore<br>recommended that substantial load curtailment from the firms discharging the<br>effluents be enforced by the government through mandatory provision of in-house<br>adequate treatment and at regulated flow rate to meet the National standards. <br></p>

Thesis Overview

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