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New Zealand Biosolids Statistics

Biosolids Production in New Zealand – 2017

The total biosolids production of New Zealand identified in the survey is approximately 64,000 tonnes per year of dry biosolids, which is a decrease on the 77,000 tonnes produced in 2015. This decrease appears to be primarily due to a decrease in the production of dry biosolids from the Wellington Moa Point, Western and Porirua WWTPs. The solids content of the dewatered biosolid range from approximately 3% to 96%, with an average of 33%. Approximately 356,000 tonnes of dewatered biosolid is produced per year, which is comparable to the 440,000 tonnes produced in 2015.

Biosolids End Use in New Zealand – 2017

The end use of biosolids in New Zealand is presented below. The total percentage of biosolids sent to landfill was 59% in 2017. This has remained approximately the same as previous years with 61% of biosolids going to landfill in 2015 and 60% going to landfill in 2013. The variety of biosolid end uses has also remained the same including land rehabilitation, agriculture and landscaping. The percentage used for land rehabilitation has increased from 4% to 5% however this is still significantly lower than the 10% reported in 2013. The percentage of biosolids used for landscaping has also increased slightly from 4% to 5%. All other categories have remained consistent.

ANZBP members can review these statistics in more detail and explore the other insights gained in this and previous surveys here.