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Available Reports: 768

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Published 14/01/2019

Wastewater Treatment Works Flow to Full Treatment - Monitoring and Compliance Assessment Method Development (18/WW/21/17)

Many Wastewater Treatment Works (WwTW) have MCERTS flow monitoring equipment at the works outlet only, which poses difficulties for assessing compliance with discharge permit conditions for Flow to Full Treatment (FFT).

We investigated the range of measurement arrangements currently in use, and their implications for FFT compliance assessment. Water companies and Regulators were consulted on their views regarding the potential (and need) for alternative FFT compliance assessment methods.

Two alternative methods (driven by flow and EDM data) were developed and applied. Approach 1 involved comparing durations of storm weir spill events and durations for which associated effluent flows exceed a FFT consent threshold. Approach 2 involved determining the level at which effluent flow reaches a plateau during storm weir spill events.

The feasibility of using static flow surveys to determine FFT compliance is also discussed.

 



ISBN: 1 84057 865 3

Published 07/12/2018

Biosolids to Market: A Strategic Proposal to Explore the Threats to Biosolids to Land – Now and in the Future (18/SL/01/9)

Biosolids are valuable sources of crop nutrients, stable organic matter and lime which improve soil quality and fertility. Their recycling to land also completes natural nutrient and carbon cycles. However, there is increasing concern about the fate of substances in biosolids (e.g. microplastics, fibres and organic chemicals) following application to land and their impact on the environment and human health. 
A robust, evidenced based approach to address these emerging issues is required to ensure that biosolids are managed safely and sustainably. 
A comprehensive review of the industry’s approach to biosolids management, and the range of substances/issues that could be present, and which could affect the current practice of biosolids recycling to agricultural land in particular, has therefore been undertaken.



ISBN: 1 84057 864 5

Published 24/11/2018

The Impact of Burst-Driven Mains Renewals on Network Leakage Performance (18/WM/08/67)

A burst-driven renewal programme can achieve a reduction in burst frequencies leading to a reduction in the natural rate of rise (NRR) of leakage. This results in a reduction in the optimal survey frequencies, in turn reducing the costs of active leakage control (ALC) to maintain leakage at the current level. Understanding the full impacts on a range of key performance indicators (KPIs) for a DMA improves will help the industry to take a full totex view of benefits of future investment and allow existing asset management models to be calibrated appropriately.

This study assessed the historic impact of burst-driven mains renewal (mains only) on the operational costs of leakage management on DMA network performance. A representative industry dataset of 487 burst-driven mains renewal schemes from four Water Service Providers (WSPs) was included. Data was normalised to mitigate variation linked to operational, geographic, and climate differences between WSPs. The normalised dataset was used to build non-linear models to predict the performance of KPIs at the level of DMA based on DMA characteristics and current performance.

KPI performance was successfully modelled for each of NRR, total DMA mains repair numbers, mains repairs numbers of renewed sections, leakage, minimum achieved leakage, and supply interruptions.

This report details the new model development and approaches to quantify and optimise the targeting of burst-driven mains renewal programmes by application of individual company data sets. The findings have been incorporated into an Excel tool for ease of application to individual company data sets to support investment planning and optimisation.



ISBN: 1 84057 863 7

Published 10/11/2018

Climate Change Modelling and the WRMP (18/CL/04/16)

This Guidance reviews current climate change evidence and methodologies and proposes a new approach for WRMP 2024 designed to be used with the forthcoming UKCP18 climate projections. The existing 'top-down' approach to climate change is resource intensive and has led to significant investment to understand how systems respond to different climate exposures. In advance of WRMP 2024, this project has sought to build upon this understanding and has developed a 'bottom-up' approach framed in the context of system resilience to droughts. An online tool accompanies the Guidance to enable practitioners to apply the approach to quickly evaluate new climate change evidence and identify any scenarios for subsequent analysis, where appropriate. Using ten contrasting case studies, the Guidance demonstrates how the approach and tool can be used to assess new climate change evidence in a proportionate, targeted and system specific manner and communicate the results to stakeholders.



ISBN: 1 84057 862 9

Published 16/10/2018

UKWIR Support for EC Aquavalens project (18/DW/02/88)

This report describes the work undertaken on the Aquavalens project funded by the European Commission. The project aimed to develop suitable techniques for the recovery of target microorganisms from large volumes of water and suitable molecular methods based on quantitative polymerase chain reaction (qPCR) for the detection of waterborne pathogens in large and small water supply systems and water used for food production. A number of promising techniques developed and validated in the early stages of the project were trialled at a number of locations in Europe including a water supply in the UK. The performance of the methods was found to vary with the type of organism being examined and the source of water. It was concluded that further methodological refinements would be necessary to develop robust techniques for pathogen detection particularly in sources of drinking water. Techniques were also developed for microbial source tracking and online bacteriological monitoring devices were evaluated.



ISBN: 1 84057 860 2