The DAF was located to close to their waste stream so the polymer didn't have enough reaction time to activate with the waste. The plant effluent was above the acceptable EPA designated limits. This spelled substantial fines for the company if it was not brought under control.
We were asked to engineer, fabricate and install a retention manifold that would allow the polymer greater contact time with the waste stream. Orchem also had to facilitate a turbulent flow to ensure greater contact time. There was of course a small footprint that had to be taken into consideration.
The existing line was 3" PVC. Orchem had to tie into that line and increase the diameter to 6" to accommodate the required flow/contact time.
The customer also wanted several sample ports for testing at specific locations throughout the retention manifold along with a flush out at the bottom of the manifold.
Based on flow calculations it was determined that a 5 pass manifold with 2 butterfly valves (one at the beginning of the run and one in the middle) would give the proper mixing and contact time. The retention manifold also needed to be valved to be taken out of service if required.
Success.
The following are pictures and descriptions of the waste water retention manifold installed in the customers waste treatment plant
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| Looking down at the manifold |
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| Side view. Against the wall. Small footprint. |
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| Tie in from 3" to 6" with isolation valve |
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| Tie in to DAF with isolation valves |
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| 2 of the 5 sample ports |
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| Center butterfly valve |
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| Mounted flush to the wall for an open walkway |
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| Bolted to the floor |
Results were outstanding at a minimal cost.
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