Product category:
Control Valves (Rotary, Mixing, Temperature Control etc)
News Release from: Simon-Hartley | Subject: NOPOL diffuser aeration grids
Edited by the Engineeringtalk Editorial
Team on 08 December 2000
Diffuser aeration grids installed at
sewage works
Recent improvements at Severn Trent's Market Drayton Sewage Treatment Works included the installation of Simon Hartley liftable, fine bubble NOPOL diffuser aeration grids
Recent improvements at Severn Trent's Market Drayton Sewage Treatment Works have included upgrading of existing equipment and increasing the plant's capacity The work was carried out by Birse Construction Limited, who provided construction and project management
This article was originally published on Engineeringtalk on 22 Aug 2000 at 8.00am (UK)
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It included the installation of Simon Hartley liftable, fine bubble NOPOL diffuser aeration grids in the two existing oxidation ditches and the construction of a new, third oxidation ditch - complete with a similar aeration grid - to provide increased capacity at the plant.
A new final settlement tank was also added to the existing pair Construction and installation work was scheduled to allow sewage treatment to continue uninterrupted throughout the project.
The first stage of the project was to construct the new final settlement tank and new oxidation ditch, and install the first Simon-Hartley liftable, fine bubble diffuser aeration grid.
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Once this was complete, the levels of MLSS (mixed liquid suspended solids) and BOD (biological oxygen demand) in the new oxidation ditch were gradually built up over several days to achieve a balance across the three ditches, in readiness for the new ditch to go on line.
However, to eliminate any risk of discharge to the river until this balance was achieved, effluent from the new ditch was re-routed through the existing ditches for treatment prior to discharge from the plant.
Similar caution was employed as each of the remaining ditches was upgraded and commissioned.
Once the new ditch was fully operational, each of the existing ditches in turn was upgraded with new Simon- Hartley aeration equipment, pipework and blowers.
The pipework grid, which was installed in the bottom of the ditches, features several thousand rubber NOPOL membrane dish diffusers to provide aeration.
Severn Trent had specified disc diffusers as they are more adaptable, and unlike tube diffusers, NOPOL disc diffusers have the added advantage of being extended, with substitution of a larger membrane, if required.
The new diffusion plant provides Severn Trent with more efficient and thorough aeration than the previous mechanical system, which relied on a horizontal surface splashing technique to aerate the effluent.
The provision of an extra final settlement tank at the plant provides some leeway should effluent throughput increase or maintenance needs dictate.
The new oxidation ditch is now fully operational and the two upgraded ditches back on line.
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