Page 35 - Hub-4 Magazine Issue 63
P. 35
Washing & Screening
Added benefits with the PowerX Equipment Design:
John Collins – Technical Director for PowerX, comments, “ The main difference with this plant compared to most S&G plants, is that the plant design ensures that all the silt is deposited back into the sand product which means they don’t require silt ponds.
“They have a fresh water pond and a thickener and the silt from the thickener is measured back into the course sand to keep that within the concrete specification and then into the fine sand and this is effectively the main difference with this and other S&G plants.
“Having originally been told by other suppliers that it could not be done, the plant operated correctly within a set of parameters will operate all day long. On the flipside of this, it is not something you can do anywhere, because if the material you are washing is really dirty there is a limit to how much you can put in the sand.
“The ‘as raised‘ material at New Barn Farm only has an average silt content of 6-8% so it
allowed Grundon’s that benefit to lose that silt straight back into
the sand without them going out of
specification.”
Water Treatment Plant:
The wash plant at New Barn Farm incorporates a MS water treatment system featuring a 12m diameter – 3m high – 340m3 volume capacity thickener which provides a minimum of 380m3/hr flow rate with a low flocculent consumption. An 8m diameter – 3m high clarified water tank provides a 150m3 capacity with a technical room housing the flocculent system. A flocculent mixing plant and flocculent sampling plant make up the system.
Ed Fagan - Head of Projects, Engineering and Design – Grundon Sand and Gravel, commented, “We are extremely pleased with the design and performance of the plant which has enabled us to eliminate the requirement for silt ponds and ensure production is as efficient as possible. The PowerX team were very professional in their approach to the project showing great attention to detail and a strong emphasis on H&S throughout the project programme.”
www.hub-4.com July/August 2020 - Issue 63
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