Secondary effluent filtration
Secondary effluent filtration
(OP)
I would like to hear forum members experience on using single media rapid sand filtration unit (polishing) to filter municipal extended aeration secondary effluent. If a coagulant (Alum)is added, is settling before the filter a must? What is the type, size and the uniformity coefficient of the filter media used?
Thanks is advance
Thanks is advance





RE: Secondary effluent filtration
RE: Secondary effluent filtration
Filters used for secondary effluent are operated at lower flow rates than rapid sand filters, typically 1/3 less gpm/sq ft.
If you add alum, you can add the alum prior to the secondary clarifier.
You would not add an additional clarification step between the secondary clarifier and the tertiary filter.
RE: Secondary effluent filtration
RE: Secondary effluent filtration
Yes you will need a coagulant if you are going to comply with PEA discharge regulations.
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