Brown and Caldwell Home Page

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      

Optimization of Air Flow in a Deep Tunnel System for the City of Los Angeles
Author: Philip Wolstenholme, Carlos Amaya, Chris Hunniford
Date: 4/912
Preprint, Odors and Air Pollutants 2012, Louisville, Kentucky, April 15-18, 2012

This paper discusses the development of a unique sewer tunnel ventilation strategy for a proposed City of Los Angeles wastewater project in the northern part of the City’s service area. Air accumulation in sewer tunnels can be a major issue due to high air flows created both in the sewer pipe and in drop structures feeding it. High air flows have many negative impacts, including limiting the liquid flow, accumulating odorous air that requires exhaust and treatment using air treatment facilities at multiple locations, and in extreme cases causing high-pressure air pockets that can release and cause structural damage due to pressure alone. The design team developed methods to reduce those negative impacts by limiting the volume of air entering and conveyed in the tunnel. For a sewer tunnel of this size this project is believed to be one of very few to use a combination of two of these methods: a submerged drop shaft and a varying tunnel diameter. The paper also discusses alternative treatment technologies for exhaust air.

This library contains published materials for which copyrights may be owned by entities other than Brown and Caldwell, but which are stored for limited uses by BC employees. Technical papers authored by BC employees generally may be printed and shared electronically with clients and prospective clients outside BC. Technical papers cannot be sold, and technical papers shared outside BC must have proper attribution of the original sponsoring organization or conference where the paper was presented. This attribution is embedded in each technical paper file when it is loaded into this library. Published articles from magazines or trade journals which are stored in this library are FOR INTERNAL USE ONLY and SHOULD NOT be distributed to clients or others outside BC, without express permission of the copyright owner. For questions regarding copyrights associated with any document in this library, or questions regarding copyrights in general, contact the Legal Department.