As competing pressures from residential development and commercial shellfish-growing increase, it is necessary to maintain water quality as new knowledge about pathogens and their prevalence emerges. Viruses in sewage discharges are a particular hazard as, unlike bacteria, they may survive for weeks or months in the environment and can be infective at low doses.
The influence and dynamics of bacterial extracellular polysaccharide (EPS) polymer production and its impact on bioflocculation in activated sludge (AS) bench-scale reactors were investigated. The impact of food to microbe ratio (F/M), reactor configuration and easily biodegradable carbohydrates in influent streams on biological processes that support or weaken good floc formation and the link with EPS quantity was studied.
Tauranga City is planning a $106 million, 14.5 kilometre wastewater interceptor to transfer wastewater from growth areas to the south and central of Tauranga City across town to an existing wastewater treatment plant. This interceptor sewer is known as the Southern Pipeline Project (SPP).
In this paper, I outline the issues that arose for Manukau Water Limited after a strong public reaction to the wastewater tariff structures, I summarize the approach and findings of a comprehensive review of the wastewater tariff structures that took place a year later.
The billions of dollars being spent on new water infrastructure in Australia is in response to the twin drivers of ongoing drought and population growth.
This paper describes the development of this master plan, including challenges associated with the quality and quantity of data and how these were overcome It gives an overview of the options considered for providing increased trunk wastewater network conveyance and will comment on the regional implications of such a development and the phasing of upgrading works.
Most organisations responsible for separate sanitary and combined sewer systems have target Levels of Service (LOS). Hydraulic models are frequently used to predict LOS performance and identify areas where targets are not met.
Watercare is responsible for supplying high quality drinking water to more than 1.2 million people. Over the past ten years Watercare has used an Integrated Source Management Model (ISMM) to assist operational and management decisions.
This paper discusses the background, methodology and challenges in the process of meeting this objective and the way forward.
Urbanisation, limited water supplies, extremes in weather patterns and environmental disasters demonstrate the need for more robust and flexible water management strategies which encompass recycling. Water reuse schemes have been successfully implemented in agriculture, domestic dual-reticulation, industrial and municipal uses in southern Australia.
Principle ways of applying Managed Aquifer Recharge (MAR) for water management is presented. Furthermore, the potential pathogen (bacteria/virus) removal capacity of the method is demonstrated by presenting three studies performed in Sweden.
Project Hobson is Watercare’s project to replace the Hobson Bay above ground sewer pipeline which serves a large part of Auckland City but is reaching the end of its life.
This paper discusses various types of common aeration blower technologies available on the market, flow and load applications, noise treatment, operation and maintenance requirements. The advanced high speed turbo centrifugal blower technology and its associated benefits are also discussed.
Two case studies are compared where source specific odour modelling guidelines have been used: odour emissions from a new brewery and odour from stabilised wastewater biosolids proposed for use in a quarry rehabilitation.
The Torere community, located in the Bay of Plenty and within the tribal bound aries of Ngaitai Iwi had historically used untreated surface water and rainwater collected and consumed in individual dwellings, for water supply.
This paper discusses the on-going implementation of this water demand management strategy. The performance against the targets set in the first year since implementation is reported. Analysis of water demand trends is discussed in relationship to the effectiveness of the measures implemented.
This paper will describe HCC’s journey towards more sustainable municipal water management. It will discuss the requirements of proposed Variation 6, the resource consent process, and the challenges facing all water users in securing their current and future water needs.
New Zealand’s water quality and quantity issues, e.g. declining water quality, over-allocation of freshwater and groundwater resources, conflicting water uses, poor pricing of water supply and wastewater services etc. are identical or similar to those in European countries.
This paper will try to assist utilities in developing a better understanding of the fire fighting operations, fire fighting water requirements and the potential advances in fire fighting technology and the impact of these advanced technologies on the utilities’ day-to-day management of their systems.
As Local Authorities and private businesses are being asked for ‘Financial Prudence’, and to save money whilst still delivering services, more emphasis will be on better integrating and optimising internal procurement systems with the external service delivery providers.
This paper outlines a contractor’s view on the entire contract procurement process. It aims to provide an insight to asset owners on the processes and systems that contractors believe will deliver them the best outcome for their service delivery needs.
Biological phosphorus removal was studied in two full-scale waste stabilisation ponds (WSP). Luxury uptake by microalgae was confirmed to occur and in one pond the biomass contained almost four times the phosphorus required by microalgae for normal metabolism.