Rehabilitation of Stormwater Culverts – Unique Aspects to be Addressed During Design and Specification
Rehabilitation of Stormwater Culverts – Unique Aspects to be Addressed During Design and Specification, Jonathan Morris Opus
National Performance Review Issues, Lesley Smith Water New Zealand
Regulatory authorities in New Zealand have communication strategies as part of their monitoring programmes to ensure the public is informed of a health risk at a swimming site, for example through the release of swimming advisories when E.coli levels exceed single sample bathing water criterions.
This paper summarises the events leading up to and following the identification of contamination in water sourced from the Waiwhetu aquifer, the water quality challenges faced by Wellington Water during this time, the national context following the Havelock North contamination incident, our approach, and decision making challenges including political and public opposition to chlorination.
Wastewater Strategy: Planning for many uncertainties, now called Wastewater Strategy: Uncovering Secrets
Wastewater planning and modelling is based around assumptions such as growth and demand. Models enable asset owners to scope their projects and meet the financial planning requirements of the Local Government Act.
Wastewater Treatment, Strategic Planning, NPS-FM, Consenting, Science, Environmental Effects, Infrastructure Planning, Asset This paper outlines the two-staged approach SDC is using to develop the Strategy and outlines how the outputs from the Southland Economic Project underpin the approach to develop and cost wastewater treatment and disposal options for the District.Management Planning
The paper identifies that active management of sewers does not need to be complex nor expensive. Rather it is a tool that can be implemented to support management from very simple situations through to highly complex ones.
The rapid growth of Hamilton has brought with it significant challenges, including maintaining suitable clean water services in the future. Seven years ago, Hamilton City Council (HCC) and Mott MacDonald embarked on a joint journey to develop a comprehensive water strategy addressing current system performance issues and future shortfalls.
ANAEROBIC TREATMENT OF CREAM CHEESE WHEY, Alzbeta Bouskova, Alistair Broughton, Chris Hearn – BPO Ltd., Ron Hamilton – Fonterra
This paper outlines some of the major drivers for the project and how they were addressed in developing the proposed scheme. These drivers include population growth, environmental constraints, short and long term effects, and the impact on the local community.
Membrane Bioreactors (MBR), are of increased interest in New Zealand, driven largely by tighter effluent consent requirements and greater reuse potential of treated effluent.
This paper will present the challenges and the opportunities for an inland rural community with substantial trade waste contributors. It will discuss the risks and benefits of dealing with SIN by codigesting trade wastes with WAS to boost energy yield.
Microbial Diversity At Two Geographic Locations – Developing A Database Of Species With Water Chemistry
When we turn on the tap we expect clean and safe water to drink. Increasing demand on water resources for anthropogenic activities and surface contamination is putting pressure on our water resources.
This is the first project that Unitywater has commissioned that requires all designed new and retained works to be included in a BIM.
Lessons Learnt From Retrofitting Existing Wastewater Catchments With Vacuum Sewer Systems Post-Earthquake
During the infrastructure rebuild after the Christchurch earthquakes in 2010 and 2011 as part of the Stronger Christchurch Infrastructure Rebuild Team (SCIRT) alternative wastewater systems were considered as a resilient alternative to replace the existing gravity systems in areas that were badly damaged by the earthquake.
This paper provides details of all aspects of the AAC trial at CBWWTP.
This paper outlines in further detail the treatment plant options that were considered, selection and development of the final design, design and construction issues encountered, and finally commissioning experiences.
Understanding the key differences between pipe materials and their design philosophies is important and often overlooked. Failings here can lead to long-term impacts on infrastructure and its whole-of-life cost. This paper explains some of these issues and the cost implications of them.
A client outcome-based approach delivered an innovative, sustainable solution to flooding, while embracing safety in design at the outset.
Operations optimisation at Wellington Water – innovation that lead to world- wide change, Simon Bunn SUEZ Smart Solutions
This paper outlines the South East Halswell Wastewater project and the smart pressure sewer technology. Focus is given to the key lessons learned on this project.
This paper reviews the close relationship that these birds have had with the treatment plant since it was commissioned in 1960.
This study seeks to expand on previous research by assessing microbial water quality from a range of greywater sources, including greywater from both residential and commercial properties.
This paper outlines the sand removal options considered for Waikato WTP, those implemented (in addition to the sand separation system, this also includes installation of a sand mobilisation pump in the raw water wet well), the lessons learnt and outcomes from this process.
The paper includes a discussion of how UV peroxide was incorporated in the existing plant treatment train, and decisions on the method used for peroxide quenching.
The world’s largest tubular biofilm reactor for biological oxidation of hydrogen sulphide (H2S) in geothermal power station cooling water was successfully commissioned in NZ in 2012.
Potential Impacts On Groundwater Quality Caused By Earthquake Induced Vertical Permeability Enhancement
Following recent major earthquakes in New Zealand there has been concern about possible groundwater quality changes due to the infiltration of pollutants from the soil or ground surface.
A Pilot Scale Evaluation of Membrane Aerated Biofilm Reactor technology for BNR Process Intensification
The MABR is a promising biological nutrient removal intensification technology. In an MABR oxygen is delivered to a biofilm growing on the outside of membrane surface by diffusion through the membrane wall (Figure 1).
Deep, Large Diameter CIPP Case Study, Chris Macey AECOM
Our research findings will help implement preventive measures to reduce drinking-waterborne infection risks. Research outcomes will promote uptake of new surrogate technology for better protection of vital freshwater resources and drinking water supplies.
As part of the reconsenting of the Omaha Wastewater Treatment Plant (WWTP) land discharge system, Watercare Services Ltd commissioned a study to understand the fate and transport of nutrients and the effects on the environment.
Following the Campylobacter outbreak in Havelock North it was recognised that there was a lack of data on the survival of Campylobacter in groundwater.
So, you’re building a Tunnel! A stakeholder’s perspective on the construction of a major infrastructure project in Melbourne
So, you’re building a Tunnel! A stakeholder’s perspective on the construction of a major infrastructure project in Melbourne, Chris Frangos, University of Melbourne
The main focus is on the rehabilitation of pressure pipelines to restore integrity & design life whilst reducing disruption and safety related claims & risks during installation.
When QLDC went to market for the 3 Waters O&M contract in 2014, it was with an expectation that the contractor would accept shared risk, be “frank and fearless” as a trusted advisor to council, and display the management courage to respectfully and persuasively challenge QLDC decision making
The paper will detail the limits to these conditions which Interflow considers would make the sewer suitable for structural lining.
A condition inspection on an ageing trunk main in Porirua identified a high level of microbial induced corrosion on the pipeline with pipe soffit deteriorating and reinforcing exposed.
The paper presents the results of the New Zealand monitoring for protozoa, considers this in the context of what has been found in the USA and elsewhere, discusses international legislative and best practice requirements and offers some provisional guidance on whether DWSNZ is too conservative.
Avoiding Interference - a Unique Approach to Dealing with a Common Problem in HDD Installations, Chris Dowd
Applying international best practice in drinking water supplies. Lessons learnt from Hastings District Council
In the wake of the Havelock North contamination incident in August 2016, the Hastings District Council undertook a comprehensive review of its people, systems, practices, and processes to enable the organization to respond to the outcomes of the Board of Inquiry investigation
The Green Square urban renewal area in Sydney, New South Wales is Australia’s largest urban renewal project delivering significant economic benefits, including 31,000 residential dwellings housing 60,000 new residents and catering for a permanent workforce of 21,000. Total development costs are forecast to exceed $16 billion.
This paper discusses how Watercare is developing a process to incorporate NIWA’s climate change projections for the Auckland region into a climate change mitigation and adaptation strategy that will guide its strategic planning and operations.
The effect of having planning tools as well as the implementation of WDM on managing water resources during this drought will be illustrated in this paper, along with relevant lessons learned to help prevent the occurrence of a Day Zero in New Zealand.
We will discuss a recent example of the implementation of the restructured delivery model in the upper north island of New Zealand, the lessons learned and project outcomes.
Within this investigation we evaluated the use of digital radiography for the assessment of valves and pipes within the field. Digital radiography is a technique that uses radiation to image critical assets, images of the critical assets are obtained instantly.
This paper outlines how by taking a more holistic approach to renewal projects and time spent in the investigation phase, a more robust multifaceted solution can be found.
The general public is widely aware of water related issues and sustainable use of our water resources is not only a goal for many people, but is requirement under the National Policy Statement for Freshwater Management (NPSFM).
CIPP A North American Perspective: Assessing the Performance of 40 Years of CIPP Lining Rehabilitation in Winnipeg, MB Canada
CIPP A North American Perspective: Assessing the Performance of 40 Years of CIPP Lining Rehabilitation in Winnipeg, MB Canada, Chris Macey, AECOM
This paper describes the process undertaken to survey and apply available technology. The process included the initial compiling, validating and understanding the wastewater rising main system, its characteristics and vulnerability.
Magnesium Hydroxide Dosing For Septicity Control: The Benefits Of A Catchment Wide Approach, Ralph Lloyd-Smith Calix
Water Sector Reform Program in Ireland – Process, Challenges and Achievements, Jerry Grant MD of Irish Water
Pathways to Sustainability through Process Intensification and Implications for Plant Operations, Sandeep Sathyamoorthy Black & Veatch
Freshwater Policy Update, Cheryl Barnes Deputy Secretary, Ministry for the Environment
Future directions for safe drinking-water in New Zealand - Todd Krieble, ChiefStrategy & Policy Officer, Ministry of Health
Danish Climatorium Sarah Lund Denmark
Climate Change and Stormwater & Wastewater Systems, Belinda Storey, The Deep South Science Challenge
Resilience Bonds, Thierry Witkowicz Veolia
Customer complaints for the love of the company
This covers the learnings around determining technical requirements for solutions and how that is underpinned through collaboration.
This paper highlights the challenges of reducing operational energy costs at a large water utility and the exciting possibilities presented by ever-more affordable distributed electricity generation technologies such as solar PV and battery storage, as well as next-level wastewater treatment technologies that optimise the production and use of biogas.
This paper outlines both the Ice Pigging process and the many advantages to the technique. Further to this it will look in detail at several Ice Pigging projects undertaken by Suez that demonstrate these economic, operational and reduced customer impact benefits.
This paper will help water authorities understand how the standards can be applied to their organisations in a manner that provides the national consistency intended by the standards whilst addressing the particular characteristics and challenges of individual networks.
This paper will describe a major asset capitalization project undertaken with Waipa District Council in which conventional (manual) data entry workflows were replaced with data automation and systematic verification processes.
Avoiding Interference - a Unique Approach to Dealing with a Common Problem in HDD Installations - David Wood, Institute of Environmental Science & Research
This paper will discuss the empirical evidence and feedback supplied from councils in New Zealand who have experienced adapting to the use of as-built information systems.
The Ōtaki Wastewater Treatment Plant (WWTP) was granted a new, non-notified Resource Consent in 2016 for the discharge of treated effluent to land.
This paper discusses some possible improvements, citing examples in the USA from the EPA and water utility perspective.
The addition of fluoride to drinking-water is a method of reducing dental caries, supported by the World Health Organisation and the World Dental Federation.
This paper shows real-world examples of well heads and discusses the practical realities of remediating well heads to meet the requirements that are likely to emerge from the Havelock North Drinking Water Inquiry.
Using Ami Technology To Reduce Non- Revenue Water, Improve Resiliency, And Enhance Customer Satisfaction
This paper will discuss evolution of Advanced Metering Infrastructure (AMI) technologies, presenting examples from projects around the world relevant to New Zealand’s unique water environment.
This paper summarises recent case studies describing four emerging approaches to reducing wetland area through process intensification: super-oxygenation for nitrification, zeolite-anammox media filtration for deammonification, biochemical reactors for denitrification, and geochemical augmentation in surface flow (SF) wetlands for phosphorus removal.
The paper will compare historical performance of the ponds verses upgraded performance from proving period laboratory testing.
This paper will discuss the collaborative safety in design approach, contracting approach and the breakdown of traditional barriers, from concept design through the six major phases to operational handover.
How Drinking Water Regulation has improved the quality of water, Ken Hutchison MD of Scottish Water
Engineering a Better New Zealand - Te Waiora Joint Institute for Freshwater Management, University of Waikato & NIWA, Dr Chris Tanner, Director
Te Waiora Joint Institute for Freshwater Management, University of Waikato & NIWA, Dr Chris Tanner, Director
Green Stormwater Infrastructure - Seattle, Tracy Tackett Seattle Public Utilities
Water utility governance in Australia - Water Services Association Australia, Stuart Wilson, Deputy Executive Director, WSAA
Thierry Witkowicz, Senior Vice President Business Development - Smart Cities, Veolia; Towards Smart & Resilient Cities
This paper presents two tiers of assessment sophistication namely: a simplified (qualitative and semi-quantitative) and an advanced approach (quantitative modelling).
The quantity and quality of water supply is always a significant concern following an earthquake. Water for drinking and cooking is vital, and it is also needed for firefighting, medical systems, and post-earthquake reconstruction.
When a natural disaster strikes, the immediate and necessary response is to get the systems back up and running as quickly as possible. However, soon after the initial response effort, the funding of the response and recovery phases becomes an obstacle that must be addressed.
A significant earthquake in the Wellington region will result in damage to the potable water network, and could result in parts of the region being without water for long periods. The Kaikoura earthquake in 2016 was a clear reminder of the risks facing the Wellington region should a large earthquake occur.
Why a chlorine residual? Facts and Uncertainties, Laith Furatian, City of Kamloops, Canada
WHO Guidelines for Small Drinking-water Supplies, Batsi Majuru, World Health Organisation
This paper outlines conventional and short-cut nitrogen removal processes, demonstrating the potential reductions in energy use, increases in capacity and improvements in effluent quality that can be achieved.
This paper describes the process and challenges of implementing a full scale nitrite shunt process in one of nine step-feed reactor-clarifiers (RCs) and subsequently introducing it to three other RCs.
The anammox (anaerobic ammonium oxidation) process has been one of the most innovative developments in biological wastewater treatment in recent years.
Emerging organic contaminants (EOCs) are gaining increasing attention across the globe. But what are they and should we be concerned?
An additional half a million people will live in Sydney’s North West by 2040, placing increased demands on the city’s wastewater treatment infrastructure.
Protection of Drinking Water Sources post Havelock North, Tony Cussins (Tonkin & Taylor) & Brett Chapman (Hastings DC)