Aeration of the activated sludge process in a typical suspended growth wastewater treatment facility can consume anywhere from 40 to 70 percent of the power consumed by the total plant. Because such a large fraction of the overall plant power is consumed by the aeration blowers, it is important to select the blower system on best value. So how does one identify best value? With a minimum of 16 different blower manufacturers, how does one sift through the sixteen different sets of manufacturers’ information to provide a comprehensive and defensible result?
This paper discusses the benefits of building redundancy and diversity into a process in the context of achieving the requirements of the current Drinking Water Standards of New Zealand, including a discussion of how the risks may vary depending on the size and type of population supplied. The design of a medium sized water treatment process which compares conventional three stage treatment and membrane treatment is presented in this paper as a case study.
New Zealand drinking water tends to lack alkalinity. Bad sludge settleability is a common problem in New Zealand waste water treatment plants. Both have one in common: dependency on cations.
Upgrading an operational public utility treatment plant presents numerous challenges to the team concerned. This case study examines a component of such an upgrade to show the pitfalls that can be encountered when work is undertaken in a sewage pump station which was required to remain operational during the plant upgrade.
This paper outlines the Flinders Sewerage Project and the smart pressure sewer technology and networks developed as part of this project. The application of this technology combined with other innovations resulted in: capital savings, reduced operational risk, reduced environmental impact, improved service outcomes, and reduced loading of the downstream transfer systems.
Fossil fuel and electricity costs could significantly increase in the not too far future. This will affect our industrial sector and waste treatment service providers who are exposed to price changes as they maintain wastewater treatment plants with significant use of electricity. CPG was commissioned in 2007 to estimate the present and future New Zealand biofuel production potential to produce additional biogas fuel via treatment of industrial and primary processing byproducts by anaerobic digestion.
This paper will address the following topics;
This paper outlines information which led to the successful conclusion of this project:
Greenlea Premier Meats Limited (GPML) own and operate an export beef processing plant in Morrinsville (Greenlea Morrinsville), and discharge wastewater as trade waste into Morrinsville Sewage Treatment Plant (Morrinsville STP), owned by Matamata Piako District Council (MPDC).
This paper will discuss several drivers for decentralised wastewater treatment, and present several case histories of various wastewater treatment plants around the world, including design criteria, effluent standards, and other descriptive information.
The paper will discuss the many complicating factors and challenges which required careful consideration and clever solutions during the project.
The following paper will analysis actual costs for the implementation and ongoing operation of the StormFilter over the last 6 years. The paper will also include some specific case studies discussing the factors that can affect the costs of stormwater BMP’s.
This paper offers benefit to council asset managers and stormwater design engineers in selecting appropriate technologies for new and existing areas.
The majority of New Zealanders live in urban environments, and national and regional community surveys have shown that improving the state of our urban waterways and environment are high priorities. An understanding of the real and perceived driving forces and pressures contributing to the sustainability of the natural resources of urban (including peri-urban) catchments, and the thresholds at which development is no longer sustainable are necessary if management goals are to be met.
The paper discusses field experiment set-up and instrumentation plan; media characteristics and specifications; hydrological characteristics of the site; and performance of the two media.
The purpose of the Plan is to guide the Stormwater Unit in its first three years of operation. The draft Plan seeks to provide direction for developing work programmes and investment proposals associated with its substantial stormwater network; guide input to, and ensure alignment with, regional directions and priorities of the emerging Auckland Plan and Long Term Plan; and to facilitate integration with other Units across Auckland Council and Council Controlled Organisations with key roles in achieving stormwater management outcomes.
This paper will present an analysis of stormwater monitoring in Christchurch City and Selwyn District that demonstrates that the stormwater from these modern areas generally has lower concentrations for many contaminants than have been previously reported in literature. Possible reasons why these concentrations are lower, which include the use of factory painted zincalume roofing iron and less leaks from vehicles, will be discussed along with the implications these may have on the requirements for stormwater treatment for modern residential subdivisions.
Our presentation will outline the key considerations in designing and implementing the control gate upgrade including:
Urban stormwater and combined sewer overflows (CSO) discharging into the Meola Creek (Auckland, New Zealand) have potential risks for public health and aquatic ecology. Monitoring was carried out by Auckland Council at selected stream, marine and discharge sites over summer and autumn 2010/2011 to characterise stream and coastal water quality.
In this paper the limitations of the method are examined in detail, with the intention of clarifying its use and range of applicability. Detail into the derivation of runoff coefficients that are applied is given, and some lesswidely known applications of the method (including the “probabilistic approach”) are described. This paper is intended for a practitioner audience.
Stormwater One of the primary objectives of the TP 10 review was to assess the existing design procedure and parameters, and update this where appropriate. The technical report provides guidance for recommended applications of swales, site constraints that will affect the suitability of swales, and details on the principles and processes by which swales provide stormwater management benefits. This paper provides an overview of the key findings and recommendations of the report.Design, Swale, Stormwater Management, TP10, Auckland Council
This paper outlines the structure of the Alliance and how the project will be delivered with a particular focus on stormwater issues. It explores how the various relationships work, relative to the responsibilities of the different parties in this respect between the stormwater engineer, ecologist and Council asset manager. It looks at some of the issues around standards and how these have been addressed, and draws together some thoughts and learning from the experience of putting together such a cooperative venture.
Low Impact Design (LID) is an integrated set of principles to minimise the effects of development on the environment through stormwater management and landuse planning techniques.
This paper focuses on Volume 2, the practice of Low Impact Design (LID). The document leads the developer and their consultants through the land development process, including site assessment, spatial planning, concept design, and concept assessment to achieve the most from LID approaches.
CatcThis paper will examine and provide examples for what should be included in each stage of the process and show how this framework and template can be used for those who need to manage water resources and land use within a catchment.hment Management, Stormwater Management, CMP, Objectives