This paper discusses a pilot study undertaken in conjunction with Metrowater Ltd. The study sought to determine the viability of extracting the data improvements from their existing calibrated water distribution models - and installing it into their existing GIS.
While water is plentiful in New Zealand, drinking quality water is becoming a valuable commodity requiring careful management if it is to be available for future generations. Tauranga’s population is forecast to double by 2051, placing increased pressure on the way the Council manages existing infrastructure and levels of service.
The paper attempts to clarify some of these uncertainties by reviewing how formal innovation programmes have been set up and run through three major water industry projects currently underway across New Zealand – The Clear Harbour Alliance in Auckland, The Hunua 4 Trunk Watermain Project in Auckland and the Major Sewer Upgrade currently underway in Christchurch City.
This paper clarifies how the benefits and costs of water quality improvements in Lake Rotorua are likely to be shared in the absence of a trading system; presents different perspectives on and principles for deciding how costs should be allocated; and then shows how different options for initially allocating nutrient allowances and achieving reductions in the cap over time conform with those cost-sharing principles.
The Rotorua Wastewater Treatment Plant has a suspended growth BNR facility (Bardenpho), followed by DAFs and 3 filter belt -presses with poly (polyelectrolyte) dosing for dewatering sludge.
This paper will outline the installation costs and maintenance costs as well as the social implications (health, inconvenience) and importantly the environmental drivers (infiltration, exfiltration, overflows) that should be considered in any decision.
This paper presents an approach where the variability and uncertainties in data and our understanding of the groundwater systems, land use practices, climate and other factors that may influence nitrate contamination are acknowledged.
In this paper we propose a method for calculating the public health benefits associated with DWSNZ compliance. Our calculations suggest that for a catchment with high protozoal risk, the benefit cost ratio for upgrading to a compliant plant could be between 0.5 and 7.1.
Pressure sewer systems are being installed throughout New Zealand with the first significant networks commissioned in June 2008 in Rotorua and Rodney.
This paper presents a summary of the testing results versus model for each unit process and a discussion of the SBR protocol and its application to a complex treatment process such as Mangere.
In May 2008 the township of Hokitika and Westland Milk Products started drinking and using water from a new PALL Microfiltration treatment plant. Lake Kaniere provides the source water which is filtered by the microfiltration membrane system and chlorinated using the existing chlorination system providing treated drinking water for Hokitika and Westland Milk Products.
This paper covers the experiences of the authors’ in the recent implementation of eight UV systems for all water supplies in the Rotorua District, ranging in scale from 2 to 40 ML/d, and details up-to-date information on UV technologies and important design parameters and essential design factors considered for all these sites.
This paper discusses two recent case studies undertaken to assess GHG emissions from wastewater treatment systems within New Zealand.
This paper will examine global case studies sourced from the WEF Biosolids and Residuals Conference, held in Portland in May 2009, and compare and contrast these seemingly successful beneficial use systems with the handful of beneficial use systems and recently acquired consents currently operative in New Zealand.
The paper covers planning issues, wastewater treatment and disposal, resource consenting, engineering design, and installation
This paper summarises a review carried out for the Ministry for the Environment on the current understanding of the incidence of on-site wastewater treatment system ‘failures’ in New Zealand, and the public health risks and environmental effects of such failures.
This paper discusses these 12 principles and outlines how these parameters can be implemented throughout the design process to optimize the sustainable outcomes of that design for the water and wastewater industry.
This paper covers the general technological aspects of directional drilling and the specific aspects relating to Birkdale C including procurement strategy and lessons learned.
This paper examines the potential of algae biofuel production in conjunction with wastewater treatment. Current technology for algal wastewater treatment uses facultative ponds, however, these ponds have low productivity (~10 tonnes/ha.y), are not amenable to cultivating single algal species, require chemical flocculation or other expensive processes for algal harvest, and do not provide consistent nutrient removal.