TREATING ACIDITY IN COAL PIT LAKES USING SEWAGE AND ...

2 Contents
9
McCullough, Lund and May (2008)
1 Executive Summary 3
2 Contents 9
3 Introduction 11
3.1 Aims 13
4 The Collinsville Coal Project Area 15
5 Effects of adding mine lake water to a sewage evaporation pond 19
5.1 Overview 19
6 Collinsville microcosms - Experiment 1 21
6.1 Background 21
6.2 Methods 24
6.3 Results 26
6.4 Discussion 34
7 Perth microcosms – Experiment 2 37
7.1 Background 37
7.2 Methods 40
7.2.1 Statistical analyses 43
7.3 Results 44
7.3.1 Changes in water quality by Day 180 of the experiment 47
7.3.2 Sediment 50
7.3.3 Changes in water quality during the experiment 53
7.3.4 Bacterial abundances 55
7.3.5 Gases evolved 56
7.4 Discussion 56
8 Field-scale remediation of a tropical acid mine pit lake with
greenwaste and sewage sludge 61
8.1 Background 61
8.2 Methods 63
8.2.1 Risk Assessment 65
8.2.2 Organic dosing 66