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- waste 1
- Waste disposal 1
- Waste disposal in the ground -- Environmental aspects 1
- Waste in government spending 1
- Waste management 1
- Waste minimization 2
- Waste minimization -- Mozambique -- Maputo 1
- Waste minimization -- South Africa -- Western Cape 1
- Waste products -- Management 1
- Waste products as building materials -- South Africa 1
- Waste products as fuel 12
- Waste tires -- Thermal properties 1
- Waste tires --Recycling 1
- Wastewater 1
- Wastewater management 1
- Wastewater purification 1
- Wastewater treatment 3
- wastewater treatment 1
- Wastewater treatment -- South Africa 2
- Water -- Disinfection 1