BPO has undertaken sampling and flow monitoring of municipal water and wastewater for several of the large New Zealand engineering consulting firms including MWH, Opus Consulting and Harrison Grierson, as well as directly for local authorities such as Waipa DC, Hamilton City Council, Thames-Coromandel DC and Matamata-Piako DC.
Public sector projects:
- Holiday (peak usage) surveys at Matarangi Beach.
- Summer holiday water survey Pauanui, Whangamata and Whitianga.
- Thames WWTP load contribution survey.
- Waipa District Council, flow monitoring of sewers in Cambridge.
- Waipa DC Pump station flow calibration.
- Rodney DC, water quality survey of the Old Cement Works lake.
- Supply & installation of stormwater flow monitoring weirs for Landcare.
- Matamata-Piako DC water supply sampling Morrinsville.
- Hamilton City Council humidity monitoring water treatment plant UV room.
Private sector projects:
- Characterisation of wastewater discharge (Food processing, dental, metal fabrication, truck wash, concrete, printers, hospitals, supermarkets and laundries).
- Trade waste compliance monitoring for a range of industries.
- Consent applications for Land Use, stormwater and wastewater.
- Long-term monitoring with continuous flow measurement for various sites.
- Characterisation of wastewater using hourly samples to identify variation in organic load to a treatment plant (from saleyard, meatworks, dairy factory, chemical plant).
- Temperature surveys in wastewater drainage.
- Wastewater treatment trouble shooting.
- Process optimization, design of permanent wastewater monitoring systems (Dairy industry NZ, Australia, USA & Sth America.
Fonterra Whey Digestion
Fonterra commissioned BPO to carry out a pilot plant to test the feasibility of anaerobic digestion for the treatment of cream cheese whey. The Anaerobic Contact process was selected as the optimal technology due to its process robustness and ability to handle waste with inherently high concentration of solids and fats.
The trial was successful and confirmed that the anaerobic contact process is capable of treating cream cheese whey at the organic loading rate of 5.2 kg COD/m3/d. The system consistently achieved very high removal efficiency with an average removal of 95% total COD and 99% soluble COD. The system generated on average 0.32 m3 of methane per kg of COD treated.