New Process Design Procedure for Dealing with Variable Trickling Filter Effluent Suspended Solids
Publication: Journal of Environmental Engineering
Volume 132, Issue 7
Abstract
Based on a survey which showed that seven of eight conventional trickling filter (CTF) plants exceeded the U.S. Environmental Protection Agency secondary treatment regulatory requirements, a new design procedure is proposed. It recognizes that bioflocculation within CTFs is poor and that most of the effluent violations seen in the survey could be related directly or indirectly to the level of effluent suspended solids. In past practice, process design focus has been on soluble or settled effluent biochemical oxygen demand rather than the effluent suspended solids. The principal focus in CTF process design should be on predicting effluent suspended solids (SS) after secondary clarification, rather than effluent carbonaceous . If the total organic loading (TOL) is set in the proper range, the effluent carbonaceous is primarily determined by the effluent SS. A new design procedure has been developed that identifies the highest TOL that can be sustained without posing a constraint on effluent SS due to effluent limitations. This is coupled with the incorporation of additional design features that can control effluent SS.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 7 • July 2006
Pages: 758 - 763
Copyright
© 2006 ASCE.
History
Received: Mar 11, 2005
Accepted: Jul 15, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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