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A sewage aeration system comprising a header pipe, plenums of synthetic thermoplastic or thermoset resin with side walls inclined upwardly and outwardly to diffusion element support means, generally horizontal diffusion elements free of through-holes other than air diffusion pores, retaining means s

A sewage aeration system comprising a header pipe, plenums of synthetic thermoplastic or thermoset resin with side walls inclined upwardly and outwardly to diffusion element support means, generally horizontal diffusion elements free of through-holes other than air diffusion pores, retaining means securing the elements about their peripheries to the plenums, sealing means adjacent the peripheries of the diffusion elements and airflow regulator members which terminate in the plenums beneath the horizontal diffusion elements.

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A sewage aeration system comprising: a horizontally extending header pipe having an upper surface which is arcuate in transverse cross-section and having air outlet openings in said arcuate upper surface at spaced points along the length of said header pipe; a plurality of synthetic thermoplastic or

A sewage aeration system comprising: a horizontally extending header pipe having an upper surface which is arcuate in transverse cross-section and having air outlet openings in said arcuate upper surface at spaced points along the length of said header pipe; a plurality of synthetic thermoplastic or thermoset resin plenums secured to said arcuate upper surface at spaced points along said header pipe in communication with said air outlet openings; said plenums having wall means, including side wall means extending transversely and longitudinally relative to said arcuate upper surface, and arcuate bottom wall means sealed in gas-tight relationship to said side wall means, said plenums further including diffusion element supporting means spaced upwardly from said header pipe on said side wall means; generally horizontal diffusion elements supported by said support means, said elements having air diffusion pores extending therethrough, but being free of through-holes other than air diffusion pores; retaining means engaging said diffusion elements about their peripheries for securing said elements to said plenums; sealing means adjacent the peripheries of the diffusion elements for preventing leakage of air from said plenums past the peripheries of said elements; and air flow regulator members in communication and connected with said air outlet openings and terminating beneath said diffusion elements for providing controlled flow of air from the interior of said header pipe to the interiors of said plenums beneath said diffusion elements.