Treatment Processes (Screens)

National Screen Evaluation Facility - Inlet Screen Evaluation Comparative Report (1999–2015)

Reference: 15/WW/06/10
ISBN: 1 84057 802 5
Published Date: 15/01/2016

This report details the results of process performance tests performed at the National Screens Evaluation Facility, Chester-Le-Street STW, between March 1999 and December 2015 on a total of 59 Inlet Screens of different generic type, comprising 11 Bandscreens, 10 Finescreens, 27 Combined Screens, 8 Bar / Slotscreens and 3 Stepscreens, with nominal aperture size varying from 6 mm to 1 mm.

The testing establishes the effectiveness of each screen tested in terms of screenings removal (expressed as Screenings Capture Ratio - SCR) and also identifies screen hydraulic performance by establishing a head loss versus flow trend for each unit tested.

The report also offers a comparison of the various generic types of screens available to the industry.

Price: £28  

Wastewater Screenings Management

Reference: 15/WW/06/9
ISBN: 184057 767 3
Published Date: 08/06/2015

Over ninety percent of waste water screenings are currently landfilled and disposal costs are rising. Screenings production has risen in recent years due to increasing population, improved screening methods and an increase in the use of so called 'flushable' wipes. Data collected for this project indicates that around 98000tpa (wet basis) is collected from WwTWs in the UK.

This project has collected new data on screenings production and composition which can be used to identify appropriate and beneficial management options. The approach described in the report allows the practical issues and applicability of selected treatment options to be assessed to ensure sound investment in process technology or screenings management solutions. Background data is provided on a wide range of relevant processes and technologies.

The Excel spreadsheet included with the report can be adapted with new supplier and cost data and used as a support tool for investment and management decisions.

Price: £150  

National Screenings Treatment Equipment Test Facility - Screenings Treatment Equipment Evaluation - Comparative Report (2010-2014)

Reference: 15/WW/06/8
ISBN: 184057 754 1
Published Date: 01/04/2015

This report details the performance evaluation of a total of 12 Wastewater Screenings Treatment Equipment units of different generic type (comprising 2 Screw Compactors, 9 Washer Compactors and 1 Tank Wash System) conducted at a purpose-built facility (now known as the National Screenings Treatment Equipment Test Facility - NSTETF) at Netheridge STW, Gloucester (Severn Trent Water).

A comparison has been made in terms of equipment condition, operation and maintenance, but the major report output is related to equipment process performance, where a single-figure comparator has been developed to meet a specific industry need / request. This is the Screenings Treatment Factor (STF) which designers, purchasers and specifiers will be using in a similar way to how the established Screenings Capture Ratio (SCR) is used to compare Inlet Screens.

Price: £13