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Wellington's new sewage treatment plant at Moa Point will be officially opened next Monday by the city's mayor, Mark Blumsky.
Moa Point is the control centre of the Clearwater process, which includes the western treatment plant in Karori.
The three-storey treatment plant at Moa Point receives and processes 65 million litres of raw sewage every day. The average flow is 750 litres a second.
All the sewage is screened as it arrives to remove large pieces of solid debris. Grit and sand are also removed because they can affect the treatment process and cause wear to the plant.
The waste then flows to the primary settlement tanks where small solids sink and cleaner effluent flows off the top. Sixty-five percent of the solids are removed as a sludge which is blended with sludge from a later stage of the process and pumped to the southern landfill site for extra treatment.
The secondary treatment process consists of blowing air into the primary treated sewage on a moving bed bio reactor....