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| Figure 1. Access to clearwell. | Figure 2. Installation of curtain to ceiling of clearwell. |
By Mark Simpson, Layfield Group Ltd.
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| Figure 1. Access to clearwell. | Figure 2. Installation of curtain to ceiling of clearwell. |
The City of Ottawa recently completed a project to increase the treatment efficiency of its two main water purification plants by installing clearwell baffling systems. Designed by CH2M HILL Canada, and installed by Layfield Environmental Systems Ltd., with Louis Bray Construction Ltd., the baffles increase the chlorine contact time in the clearwell by forcing the water along a longer flow path through the system, thus reducing short circuiting and flow "dead zones". The curtains, manufactured by Layfield, were constructed of potable grade, reinforced membrane material that is flexible enough to fit inside a small 900 mm x 900 mm access hatch when folded.
Once inside, the curtains were anchored to the floor and ceiling of the clearwell using 316 grade stainless steel. A custom designed, rope reinforced curtain edge detail allowed Layfield to achieve enhanced curtain-anchor connection strengths.
The project involved the use of over 5,000 square metres of curtain material, 5.7m in height, and took approximately 35 days to install inside four separate clearwell chambers.
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