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Characterization and Chemical Speciation Modelling of Saline Effluents at Sasol

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Characterization and Chemical Speciation Modelling of Saline Effluents at Sasol Characterization and Chemical Speciation Modelling of Saline Effluents at Sasol Synthetic Fuels Complex-Secunda and Tutuka Power Station by Amon Nyamhingura November 2009 Characterization and Chemical Speciation Modelling of Saline Effluents at Sasol Synthetic Fuels Complex-Secunda and Tutuka Power Station by Amon Nyamhingura BSc. (Honours) Applied Chemistry, (N.U.S.T, Zimbabwe) Supervisor: Dr L. F. Petrik A thesis submitted in fulfilment of the requirements of the degree of Master of Science in Chemistry in the Department of Chemistry Faculty of Science University of the Western Cape November 2009 Declaration I declare that Characterization and Chemical Speciation Modelling of Saline Effluents at Sasol Synthetic Fuels Complex-Secunda and Tutuka Power Station is my own work, that it has not been submitted for any degree or examination in any other university, and that all the sources I have used or quoted have been indicated and acknowledged by complete references Full Name: Amon Nyamhingura Nov 2009 Signed: i ABSTRACT Chemical speciation and the evaluation of species distribution is the key to understanding the potential of brines to form scale or corrode the water circuit as well as the potential of mobility and release trends of the pollutants into the environment. It is important to identify highly soluble free ions in water chemistry because toxicity of ions is related to mobility and consequently bioavailability. The chemical composition, character and chemical speciation modelling of saline effluents (brines) at Tutuka Power Station and Sasol Synthetic Fuels Complex in Secunda were studied. The form in which chemical species exist (chemical speciation) and the physical and chemical interactions of species in saline effluents at these two study sites is not fully understood. This study investigated how pH, temperature, alkalinity and chemical composition influenced chemical speciation, species distribution, scale forming and corrosion potentials of the different saline effluent streams at the two sites using computer programs PHREEQC and Aq.QA. Characterizations of the results were presented in Stiff and Piper diagrams generated by the Aq.QA computer software. Chemical speciation modelling of the brines showed that scale-forming minerals aragonite, calcite, hematite, anhydrite and gypsum have positive saturation indices between 0 and 20 in mine water, RO brine at Tutuka and Sasol Secunda, EDR brine at Sasol Secunda and VC brine at Tutuka Power Station. The water types at Tutuka Power Station were found to be mainly Na-SO4 water types and those at Sasol Secunda were a mixture of Na-Cl and Na-SO4 water types. Water treatment chemicals play a major role in increasing the salt concentration in the treatment plants and in changing the character of water streams including introducing elements that were absent in the intake water. It was found that Sasol Secunda water streams are much more heavily contaminated than Tutuka water streams. The study also found that the mine water utilised at Sasol Secunda is two-fold more polluted than the mine ii water utilised at Tutuka although these sites are a mere 40 km apart. The sodium adsorption ratios showed that all the saline effluent streams at Tutuka and Sasol Secunda were unsuitable for irrigation, except for desalination product waters. Chemical speciation showed that the predominant species in the most concentrated saline effluent (VC brine) at Tutuka were the free Cl- ion at approximately 100 % with very minute quantities of FeCl+ and ZnCl+ and the predominant sodium species were the free Na+ ion which existed at 85 %. Magnesium species had the predominant form as the ionic compound MgSO4 at 73 % and the carbonates were - - 2- mainly in the form of NaCO3 (53 %), HCO3 (28 %) and CO3 (7 %). The most concentrated brine analysed at Sasol Secunda was the TRO brine. PHREEQC did not predict the precipitation of CaCO3 from the TRO brine at Sasol Secunda. The most 2+ abundant calcium species were Ca (59 %) ions and CaSO4 (40 %). The brine was at a pH of 5.76 with dissolved CO2 at 73 % of the carbonate species. Trace elements were evaluated and the toxic trace elements varied from 0.07 mg/L (As) to 26.75 mg/L (Sr) at Sasol Secunda. At Tutuka Power Station the toxic trace elements in brines varied from 0.02 mg/L (As/Se) to 16.85 mg/L (Sr). Sr and B were found to be the most highly concentrated toxic elements. The major and trace ion chemistry, alkalinity, pH, sodium adsorption ratios, change in concentration of the water streams and the brine chemical composition after contact with ash was also evaluated. When saline effluents at Tutuka Power Station and Sasol Secunda are combined with ash, pH, Ca content and alkalinity of the resulting solution increased. The chemical composition of saline effluents can be influenced by the ingress of CO2 from the atmosphere. The study shows conclusively that brine composition and concentration is highly variable at these South African power utilities and processes such as RO, contact with ash and CO2 ingress can have an impact upon the overall brine quality. Aq.QA was iii found to be a more accurate tool for classifying waters according to dominant ions than Stiff diagrams but Stiff diagrams still have the superior advantage of being a mapping tool to easily identify samples of similar composition as well as quickly identify what has been added or what has been removed from a water stream. Chemical speciation could identify effluent streams where CO2 dissolution had taken place. iv ACKNOWLEDGEMENTS • National Research Fund, Sasol, Eskom and Coaltech for financial support • DR L. F. Petrik and Dr W. M. Gitari for their supervision and advice • Mr S. Mahlaba and staff of Sasol Environmental Sciences and Technology R&D laboratory for their time and assistance during sampling and analysis of water samples. • Mr R. Doubell Jr and Sasol Environmental Sciences and Technology R&D laboratory for providing historical data • Mr M. Hughes, Ms L. Fortuin, Mr J. Swart, Mr F. Greyling and Mr M. Mukwevho of Tutuka Power Station for providing figures, historical data and assistance during sampling and analysis of water samples • South African Weather Service for providing rainfall figures • ENS group members for their assistance • My family for the encouragement and support. v TABLE OF CONTENTS Declaration.....................................................................................................................i ABSTRACT..................................................................................................................ii ACKNOWLEDGEMENTS.......................................................................................... v LIST OF TABLES.......................................................................................................ix LIST OF FIGURES ...................................................................................................... x ABBREVIATIONS ...................................................................................................xiii CHAPTER 1: GENERAL INTRODUCTION ............................................................. 1 1.1 Overview of Water Use and Treatment in South Africa..................................... 1 1.2 Problem Statement and Hypothesis .................................................................... 3 1.3 Rationale ............................................................................................................. 5 1.4 Scope and Delimitations ..................................................................................... 6 1.4.1 Tutuka Power Station................................................................................... 8 1.4.2 Sasol Synthetic Fuels Complex in Secunda............................................... 11 1.4.3 Delimitations.............................................................................................. 16 1.4.4 Thesis Outline ............................................................................................ 17 CHAPTER 2: THE ORIGINS, DISPOSAL, CHEMICAL COMPOSITION, CLASSIFICATION AND ENVIRONMENTAL IMPACTS OF BRINES ............... 19 2.1 Introduction....................................................................................................... 19 2.2 Origins of Brines: Globally............................................................................... 19 2.2.1 Introduction: General Global Aspects ....................................................... 19 2.2.2 Chemical Evolution of Natural Groundwater ............................................ 20 2.2.3 Electrochemical Evolution of Natural Groundwater ................................. 23 2.2.4 Formation of Natural Brines ...................................................................... 24 2.2.5 Artificial Brines ......................................................................................... 26 2.3 Composition, Characterization and Classification of Brines............................ 27 2.3.1 Introduction................................................................................................ 27 2.3.2 Classification in Relation to Chloride Ion Concentration.......................... 28 2.3.3 Other Classification Systems ..................................................................... 30 2.3.4 Characterization of Water Chemistry ........................................................ 31 2.3.5 Composition of brines................................................................................ 34 2.4 Uses of Brines ..................................................................................................
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