| D | Digesters, anaerobic, effluent treatment |
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| D | Activated sludge plant, effluent treatment |
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| D | Sludge thickening plant, effluent treatment |
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| D | Sludge extractors, effluent treatment |
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| D | Sludge driers, effluent treatment |
|---|
| D | Filtration equipment, water and effluent treatment |
|---|
| D | Diffusers and aerators, effluent treatment |
|---|
| D | Flotation plant, effluent treatment |
|---|
| D | Surface skimmers, water treatment plant |
|---|
| D | Odour treatment plant, effluent treatment |
|---|
| D | Osmosis systems, water treatment |
|---|
| D | Effluent treatment plant, for mines and quarries |
|---|
| D | Effluent treatment plant, agricultural |
|---|
| D | Effluent treatment plant, waste fibre recovery |
|---|
| D | Effluent treatment plant, waste ink and starch recovery |
|---|
| D | Water chlorination plant |
|---|
| D | Water demineralisation plant |
|---|
| D | Water deionising equipment |
|---|
| D | Water oxygenation plant |
|---|
| D | Water ozonisation plant |
|---|
| D | Water sterilisation plant |
|---|
| D | Water clarification plant |
|---|
| D | Water purification equipment, ultra-high purity |
|---|
| D | Water purification equipment, ultraviolet (UV) light |
|---|
| D | Water purification systems for flue gas desulphurisation plant |
|---|
| D | Drinking water treatment and purification plant |
|---|
| D | Treatment systems for water percolated from solid urban waste disposal areas |
|---|