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A BRITISH PERSPECTIVE TO BIOSOLIDS RECYCLING IN THE FACE OF LEGISLATIVE THREATS AND OPPORTUNITIES: RECYCLING STRATEGY DEVELOPMENT AND IMPLEMENTATION

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This paper details the process by which United Utilities Service Delivery (UUSD) and their engineering services provider, Montgomery Watson Programme Management Limited (MWPM) have been able to define a biosolids treatment and recycling strategy in a rapidly developing and changing regulatory environment. The strategy development has looked at the immediate demands of legislation for England and Wales to be implemented by 1st January 2002 as well as future European legislation that will impact on the ability of UUSD to reliably continue its recycling activities. This paper provides a comparison between the US EPA Part 503 Biosolids Rule and the proposed regulation for England and Wales. The paper describes the HACCP procedure and its application to the biosolids treatment process.

The paper will detail the steps taken by UUSD and MWPM to audit its existing recycling routes and to identify and secure additional capacity. Because of stringent final product standards imposed under the developing regulation, it has also been imperative to implement an urgent and extensive sampling programme to define and understand the mechanisms for pathogen reduction across UUSDs existing biosolids treatment processes.

In parallel with the development of an increased understanding of the conventional processes, UUSD are implementing a series of experiments intended to improve its understanding of the performance of Mesophilic Anaerobic Digestion (MAD) by investigating batch digestion processes. Under certain configurations it is found that the performance of the mesophilic biosolids treatment process could be relatively simply enhanced from a normal reliable 1.5 log kill performance to a potentially substantial kill. The paper will outline the very encouraging laboratory results generated for the experimental process configurations which are currently being developed as a full scale trial using an accelerated programme such that its results can be used in the defining the next phase of construction work.
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Document Type: Research Article

Publication date: 2001-01-01

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