ABSTRACT
Radical Concrete Technology. Edited by R K Dhir and P C Hewlett. Published in 1996 by E & FN Spon, 2-6 Boundary Row, London SE1 8HN, UK. ISBN 0 419 21480 1. ABSTRACT. This paper describes design concepts and construction methods associated with the construction of six (6) large trickling filter towers for the recent secondary wastewater treatment plant expansion at the Metropolitan St. Louis Sewer District’s Bissell Point Wastewater Treatment Plant in St. Louis, Missouri, USA. These circular towers were designed using tilt-up concrete panels, vertical cast-in-place concrete pilasters and a cast-in-place concrete ring beam at the top of the open tower. The site is located in a moderate seismic region, requiring the computation of seismic forces and establishing a load path for these forces. Wastewater receives biological treatment while flowing through layers of corrugated polyvinyl chloride media, supported on precast concrete media supports; there is no liquid pressure on the wall panels. Keywords: Environmental engineering concrete structures; tilt-up concrete; trickling filter towers; biological wastewater treatment; steel corrosion; concrete deterioration. Larry G.Mrazek, P.E., S.E., is a Senior Engineer with Sverdrup Facilities, Inc., St. Louis, Missouri, USA. He specializes in the design and construction of environmental engineering concrete structures and the repair of concrete structures. He is an active member of ACI 350, “ENVIRONMENTAL ENGINEERING CONCRETE STRUCTURES”, and he is a Fellow of the American Society of Civil Engineers, a member of the Prestressed Concrete Institute and a member of the International Concrete Repair Institute.
