Project Appreciation and Objectives
The UK Environment Agency Water Sector Plan sets out a 25 year environmental vision for a sustainable water industry with a prime objective to minimise the production of, and manage, wastes from operational activities in line with evolving best practice. Approximately 100,000 tonnes of screenings are produced annually in the UK, mostly disposed of in landfill with increasing charges year on year, or for reclamation projects (usually as composted screenings).
Substantial variations in screenings quality may relate to the nature of the gross debris in sewage owing to the differing nature of drainage areas and varying success in encouraging the public to implement bag it and bin it campaigns. The types of screenings dewatering equipment in use at individual wastewater treatment works and maintenance practice are other important factors.
This project aims to identify opportunities for improving the quality of dewatered screenings to enable beneficial use, and to examine the economic viability and security of options, such as gasification, as an alternative to landfill or reclamation.
Business Benefits to Clients
- Reduced OPEX costs associated with screenings disposal through recycling opportunities.
- Increased level of operational and environmental sustainability through the ability to select screenings management strategies that align with company and regulatory objectives.
- More robust investment plans from better knowledge of screenings recycling options.
- Work with screenings dewatering equipment providers to collate information on advanced screenings washing and dewatering plant, including performance, operability, product quality and whole life costs, to support future investment plans.
- Produce a national characterisation data set of the key properties of washed and dewatered screenings from different types of advanced screenings dewatering equipment.
- Identify beneficial use options which offer the greatest potential for washed and dewatered screenings and investigate the most favourable options.
- Work with the Environment Agency and other stakeholders to develop waste protocols for viable and secure screenings recycling options.
Project Output and Implementation
Guidelines for screenings dewatering and recycling practice for planners, designers and operators to enhance company strategies, asset standards, and operational practice. These will be supported by screenings quality specifications for advanced dewatering equipment, and a spread sheet tool to assess the security and economic viability of recycling options.
Related WRc Work
- CP442: Sustainable Sewer Grit Recycling, 2012.
- Economic assessment of management options for WwTW Wastes, UKWIR, 2007.
- The future of Industry Waste Streams, UKWIR, 2006.