A Wastewater Case Study for Severn Trent Water at Melton Mowbray STW

Project Profile

Melton Mowbray STW is a medium sized activated sludge works, treating a PE approx. 68,000. The works treats a combination of both domestic and trade effluents. The new Melton Mowbray STW is designed to cater for increased treatment flows equating to a design horizon population equivalent of 123,328 (82% growth) and a tightening of the phosphorus and ammonia permits. A significant proportion of the influent is from trade waste. HUBER were heavily involved in the design and planning of the new inlet works with MWH and Severn Trent Water.

- Inlet works refurbishment replacing the two existing 6mm screens with three 6mm screens and installation of wash compactors.

Early involvement with MWH, through site visits and meetings enabled a proven solution to be designed for both screenings and screenings handling requirements. Severn Trent water should hopefully see the huge benefit this technology brings to the downstream process very quickly.

HUBER were involved in part of the innovative solutions to ensure the re-use of the existing inlet structure in lieu of a new structure.

The existing two HUBER screen installation with centre by-pass channel was designed to be replaced by three new HUBER Belt screens EscaMax® and two HUBER Wash Press WAP® L compactors. This was further complicated as the refurbishment had to fit the existing inlet works. This was achieved by the provision of a new bypass pipe outside the inlet works structure and the use of the existing centre bypass channel to house the third screen. We worked collaboratively with MWH to ensure that this was achieved.

HUBER Technology Supplied 

• 2 x HUBER Belt Screen EscaMax® 4000x752/6 60°
• 1 x HUBER Belt Screen EscaMax® 4000x952/6 60°
• 2 x HUBER Wash Press WAP® L 8
• Interconnecting Launder

Details of the process including for screens:

• Total flow rate 548 l/s. Peak flow per screen 183 l/s Duty/assist/assist
• Screen width 752 = 2.85 m3/h and screen width 952 = 3.6m³/h, total capacity 9.3 m3/h   all @ 50% blinded

Details of the process including for screenings handling:

• 9.4 cu.m/hr duty/standby
• Screens 0.733 l/s @ 5 Bar. Screening handling Peak 1.5 l/s at 2 bar in operation 

Objective & Solution

The main objective for us was the efficient refurbishment of the inlet works with installation of three new HUBER screens and two HUBER wash compactors on a phased changeover at the inlet.

HUBER completed the mechanical installation over three stages with commissioning being completed in stages (in between the install stages) before the next machine was installed as the site needed to have at least one EscaMax® running throughout the installation process.

HUBER Belt Screen EscaMax® Product Profile

• World class screening efficiency- 84% average solids capture ratio
• Unique sealing design ensures continued efficiency with minimal maintenance
• No requirements for self-adjusting brush due to innovative design
• Range of perforation sizes & screen installation angles available
• 300+ installations UK & Ireland

HUBER WAP®L Wash Press Product Profile

• Screenings from launder systems or direct from screens where screen wash water rate is high
• Wet screenings throughput up to 24m3/hr
• Volume, weight & disposal cost reduction up to 85%
• Low power & wash water consumption
• 600+ installations UK & Ireland

David Foster McBride (Area Sales Manager) commented on the project “Early engagement with the customer allowed for a suitable innovative solution to be selected to handle the design parameters and be successfully delivered within the existing inlet works limitations. The project was delivered on time and to budget and is an excellent demonstration of close involvement with Severn Trent Water and MWH.”