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- Sewage -- Purification -- Environmental aspects -- South Africa -- Veldwachters River 1
- Sewage -- Purification -- Flotation 2
- Sewage -- Purification -- Heavy metals removal 1
- Sewage -- Purification -- Mathematical models 1
- Sewage -- Purification -- Oil removal 1
- Sewage -- Purification -- Oxidation 4
- Sewage -- Purification -- Phenol removal 3
- Sewage -- Purification -- Reverse osmosis process 3
- Sewage -- Purification -- Sequencing batch reactor process 1
- Sewage -- Purification -- South Africa -- Mpumalanga 1
- Sewage -- Purification -- Technological innovations 1
- Sewage disposal 9
- Sewage disposal -- South Africa 1
- Sewage disposal -- South Africa -- Western Cape 2
- Sewage disposal in rivers, lakes, etc. -- South Africa -- Veldwachters River 1
- Sewage disposal plants 8
- Sewage disposal plants -- Energy consumption 1
- Sewage disposal plants -- Environmental aspects -- South Africa -- Mpumalanga 1
- Sewage disposal plants -- Environmental aspects -- South Africa -- Veldwachters River 1
- Sewage disposal plants -- Mathematical models 1