Table 9.1 Types of re-entry system
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| System |
Residuals managed |
| Freshwater ecosystems (streams, lakes and wetlands) |
- treated wastewater effluent (various levels of treatment)
|
| Marine ecosystems (estuaries, harbours and ocean –
coastal and offshore) |
- treated wastewater effluent (various levels of treatment)
|
| Land ecosystems (agricultural, horticultural, forestry
or landscaped areas) |
- some untreated wastewater (more rare)
|
| Atmosphere |
- treated wastewater effluent (various levels of treatment)
- odour
- gases (indirect and flaring of landfill gases)
- wastewater aerosols (a by-product of treatment processes)
|
| Landfills (closed systems) |
|
| Waste-to-energy plants (not used in New Zealand at present)
|
|
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