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Passive Treatment of Acid Mine Drainage Using South African Coal Fly Ash in a Column Reactor

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Passive Treatment of Acid Mine Drainage Using South African Coal Fly Ash in a Column Reactor Passive treatment of acid mine drainage using South African coal fly ash in a column reactor. By Etienne Beya Nkongolo Thesis submitted in fulfilment of the requirements for the degree Master of Engineering: Chemical Engineering In the Faculty of Engineering At the Cape Peninsula University of Technology Supervisor: Prof. Tunde, V. Ojumu Co-supervisor: Prof Leslie, F. Petrik Bellville Campus April 2020 CPUT copyright information The thesis may not be published either in part (in scholarly, scientific or technical journals), or as a whole (as a monograph), unless permission has been obtained from the University ABSTRACT Fly ash (FA) and acid mine drainage (AMD) are two undesirable materials generated from combustion of pulverized coal for energy and mining activity respectively. Both waste materials have serious, negative impacts on the environment. Fly ash storage leaches a variety of contaminants into surface and groundwater and AMD contains high amounts of "# toxic metals besides the already dominant ��! concentrations. Many studies had investigated AMD treatment using FA and successfully removed significant amounts of sulphate, as well as minor and trace elements. Hence AMD can be treated using coal fly ash in an active or passive system without addition of any other chemicals. This study had as of objectives the evaluation of the neutralization capacity of FA from two South African’s power stations located in Mpumalanga which are Lethabo and Kendal with mine drainage water from the Mpumalanga coal fields using passive treatment. The research program simulated ex-situ neutralization of AMD in a fly ash slurry followed by continued AMD contact, representing the potential for using spent material as mine annulus fill to reduce air and water content and further AMD generation. Both the fly ash and AMD were obtained from the Mpumalanga province in Eastern South Africa. A 3:1 slurry ratio of AMD to fly ash was mixed until pH stabilized. After mixing, the slurry was packed in columns and left for a duration of 24 hours for a good settling time before the hydraulic treatment. Thereafter the AMD was continuously passed through the columns using gravity flow. Samples of effluent were collected at set time intervals during the hydraulic treatment. These samples were used to determine the flow rate, pH of the leachates and some sent for analysis by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and Ion Chromatography (IC) to determine the composition of the effluent water recovered. The X-ray diffraction done on both coal fly ash sources shown a dominance of quartz and mullites,on the other hand the X-ray fluorescence demonstrate that Kendal and Lethabo coal fly ash belong to class F ash due to fact that the total composition of SiO2, Al2O3 and Fe2O3 was exceeding 70% of the entire composition. Moreover, trace elements such as As, V, Ni, Mn, S, Sr, Cu, Y and Pb are found in the CFA used as well. The ICP-OES analysis showed that Eyethu AMD is very acidic with a pH of 2.23, with sulphate concentration of 2680 mg/L, displaying the existence of some metals some of which are Ca, Al and Fe. The neutralization process of Eyethu acid mine drainage using Kendal and Lethabo CFA was highlighted by the variation of pH from the time mine water was in contact with CFA, for the treatment with i Lethabo CFA the treated water had its pH raised from 2.23 to 12.65 and from 2.23 to 8.37 using Lethabo and Kendal CFA respectively and this phenomena was explained by the dissolution and hydrolysis of the oxide components such as CaO. This neutralization process was characterized by a strong buffer zone around the pH of 12.83 to 8.37 from the Lethabo leachate and between 8.37 to 7.28 for the leachate from Kendal column. This buffer zone is explained by the hydrolysis of Al3+ which forms a hydroxide phase until all the aluminum ion was totally hydrolyzed. Electrical conductivity was also observed to vary. An amount of 1440 g of Kendal fly ash was used in the columns and treated 15 bed volumes of Eyethu AMD before the CFA was exhausted and lost its neutralizing power in the case of Lethabo CFA, 13 bed volumes of AMD were treated with 1280g CFA before breakthrough was observed. During treatment of Eyethu AMD with Lethabo and Kendal CFA the flow rate of the effluents water first increased during the first minutes of contact of AMD with CFA then started decreasing with time. The concentration of sulphate was reduced to up to 88% in the effluent from Lethabo CFA and 56% in the effluent from Kendal CFA. Some other metals such Fe, Mg, Mn, Al have been significantly removed from the AMD in the Lethabo and Kendal leachate. Furthermore, mass balance calculation were done around the columns in order to determine the moisture content and the % water recovery. From the calculation done it was shown that the column made of Kendal CFA can treat the AMD with a water recovery of 91.9% while Lethabo column could only recover 83.33% of the inlet water. In addition, Acid Base accounting tests were done in order to determine whether either Kendal or Lethabo CFA are from an acid generating or neutralizing rock. Test results have shown that both Kendal and Lethabo CFA are from an alkaline producing rock as their Net Neutralizing Potential and Neutralizing Potential Ratio were above 20 Kg/t CaCO3. ii LIST OF ABBREVIATIONS ABA – Acid base accounting ALD – Anoxic limestone drain AMD – Acid mine drainage AP – Acid potential ASTM – American society for testing and materials CFA – Coal fly ash DWAF – Department of water affairs. EC – Electrical conductivity ED - Electro dialysis EDR – Electro dialysis reversal IC - Ion chromatography ICP-OES - Inductively coupled plasma-optical emission spectrometry IR – Infra red LOI - Loss of ignition MF - Micro filtration MPA – Maximum potential acid NF – Nano filtration NNP – Net neutralization potential NP – Neutralization potential NPR- Neutralizing potential ratio OLD – Open limestone drains PRB – Permeable reactive barriers iii RO - Reverse osmosis SAPS – Successive alkalinity producing system SRB - Sulphate reducing bacteria UF – Ultra filtration WHO - World Health Organization XRD – X-ray diffraction XRF – X- ray fluorescence ℓ - Density iv DECLARATION I, E. B. Nkongolo declare that the contents of this thesis represent my own unaided work, and that the thesis has not previously been submitted for academic examination towards any qualification. Furthermore, it represents my own opinions and not necessarily those of the Cape Peninsula University of Technology. Signed Date v DEDICATION I dedicate this piece of work to my god for allowing me to get to this level and to my closest family for their tremendous support throughout the course of this study: • Benjamin Nkongolo (Late Father) • Therese Tshilanda Mulumba ( Late mother) • Emilie Kalonji ( wife ) • Alain Tshilumba (brother) • Evka Keyembe (Brother) vi ACKNOWLEDGEMENT I would like to thank the almighty god for the gift of life, protection, and strength throughout this study and for allowing me to live my dream. I would like to thank: • My supervisor Prof T.V Ojumu for offering me the opportunity to accomplish my postgraduate studies under his supervision. I thank him for his guidance, advice, support, and patience and most importantly for believing in me. May god bless you Prof. • My Co-supervisor Prof L.F Petrik for her tremendous support, encouragement, love, advice, financial support and the opportunity to complete my master’s study through the ENS research group. For always listening to my problems and look for ways to solve them. May the almighty god continue to bless and protect you Prof. • Prof John T Kevern from the University of Missouri-Kansas City for giving me a chance to work with him in this study • Rosicky Kalombe Methode for his encouraging and advice. • Vinny Ndate KatambwE, Evral Ntsa for being such good friends throughout this journey and for their supportive advice and motivation towards my lab work. • Jean Luc Mukaba for your help and encouragement. • Mrs Ilse Wells, Mrs Vanessa Kellerman and generally to my friends and colleagues at the Environmental Nano Science research group (ENS) for their technical and physical assistance that jointly make my research work comfortable. • Nzenzele Ndlovu for her help and motivation. • Kelly Moir from Scientific lab for her help with XRF analysis • Remy Bucher from iThemba for his help with XRD analysis • Papa Mpoyi Kalonji and Maman Justine Mbombu for your words of encouragement. • My brothers and sister in Christ for their spiritual interference vii LIST OF PUBLICATION • Nkongolo, E.B., Katambwe, N.V., Kalombe, R.M., Petrik, L.F., Kevern, J.T., OJumu, T.V. “Passive treatment of acid mine drainage using South African coal fly ash, column leaching study”, World of coal ash conference, 13 May 2019, Colorado United States viii TABLE OF CONTENT CONTENTS ABSTRACT ......................................................................................................................... i List of abbreviations ........................................................................................................ iii DECLARATION ............................................................................................................... v DEDICATION .................................................................................................................. vi ACKNOWLEDGEMENT ............................................................................................. vii LIST OF PUBLICATION ............................................................................................
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