Case Study-Kaipara

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Objective: Remove Parasitic Helminth Nematode Eggs, Reduce Turbidity And TSS

Company Kaipara District Council
Location Mangawhai, New Zealand
Year 2009
Description Tertiary Effluent Filtration
Goal Remove parasitic Helminth Nematode eggs, reduce turbidity and TSS
Capacity 20 m3/hour
Water Source Municipal effluent

The Problems:

  • Mangawhai is a water-surrounded popular tourist resort,on New Zealand’s east coast.
  • Its population grows considerably during the summer months, and septic tank effluent was causing poor water quality in the harbour
  • The wastewater contained a high concentration of the parasitic nematode Ascaris spp . The worm infects the blood, lungs, internal organs and can grow up to 35cm in the intestine . T he nematode can prove to be fatal. The infectious egg (40 um) must be removed from the wastewater to allow it to be used for irrigation.
Parameter Existing Value Required Value
TSS (mg/l) 100 <10
Turbidity (NTU) Up to 50 <5
Hign None

Ascaris juvenile and an egg, an adult can produce 200,000 per year.

Helminth Life Cycle:

Technical Solution:

  • AFM® – Activated Media filtration with coagulation, implementing a filter with 1600mm diameter.
  • AFM® filter auto-cleaning with a combination of backwash water and air scouring.

The system was designed and built by GEBEL from Sydney Australia


Parameter Existing Value Required Value After Treatment
TSS (mg/l) 100 <10 <1
NTU Up to 50 <5 <2
Helminths High None NIL

During the period no nematode eggs were detected in the product water from the AFM filters.