Dr. Neethling is a Senior Vice President with HDR Engineering, Inc. As the Technical Director for Wastewater Treatment, he is responsible for evaluating technical solutions to environmental problems, drawing from his academic and research experience to find practical solutions for current challenges.
He started his engineering career in South Africa in 1978 at a time when nutrient removal from wastewater emerged as an important issue. His Ph.D. studies on control of filamentous bulking using chlorine led to an interest in solving operational problems at wastewater treatment plants. While teaching at UCLA, Dr. Neethling conducted research in anaerobic digestion, biological fluidized beds, and water quality for reuse. In his 24 years at HDR, he has engaged in a wide range of design and planning projects for both water and wastewater treatment facilities.
Dr. Neethling's primary focus has been on nutrient removal design and operations, having been involved in more than 75 biological nutrient removal (BNR) projects. He is currently the principal investigator for the WERF Nutrient Removal Challenge. This program engages researchers and collaborators across the globe to develop scientific information about the fate of nutrients (both nitrogen and phosphorus), their characteristics, treatability, and bioavailability in aquatic environments. The goal is to translate the research findings into practical solutions to protect water quality, allowing treatment facility operators to select sustainable, cost-effective methods, and technologies to meet permit limits.
Dr. Neethling has contributed to the Manual of Practices and served as associate editor for the American Society of Civil Engineers (ASCE) and Water Environment Federation (WEF), organized conferences for International Water Association (IWA) and WEF, and served on committees for several professional organizations. He has published technical papers in ASCE, WEF, and IWA journals, and presented at numerous state, national, and international conferences.
Dr. Neethling's lectures will provide valuable examples of converting fundamental engineering and scientific principles into practical large-scale solutions. Students will benefit from seeing research converted into full scale operating facilities.
Each wastewater treatment challenge is unique because of permit requirements, wastewater characteristics, and the need to provide cost-effective, reliable solutions. While new technologies can provide unique approaches to meet treatment needs, the risk of implementing new approaches at full scale must be carefully weighed against the benefits of an emerging technology. Innovative solutions and creative thinking can push the envelope and provide economical solutions to practical problems.
This lecture presents examples of taking theory and research findings to identify practical, innovative solutions to practical problems. The risk associated with novel solutions must be assessed and may require pilot- or full-scale testing to control the risk exposure. The following case studies are presented:
Applying emerging and novel approaches to solve wastewater treatment challenges allows for economical solutions but does generate some risk of failure. These risks must be mitigated. Full-scale follow-up testing provides opportunities for correcting and improving the performance. Achieving a successful outcomes requires collaboration among the designer, operator, and owner of the wastewater facility.
In-stream nutrient water quality criteria set by the United States Environmental Protection Agency (EPA) requires very low total nitrogen (TN) and total phosphorus (TP) concentration in all water bodies. Because the background nutrient concentrations in many streams, rivers, lakes, and estuaries already exceed the nutrient criteria, there is no option for dilution credits for treatment plant effluent, and the nutrient criteria are translated into very low permit limits - TN limits below 1 mg/L and TP below 10 µg/L. Meeting these low limits reliably and economically poses new challenges to technology capabilities, planners, designers, and operators.
The understanding of biological and chemical process fundamentals for nitrogen and phosphorus removal has increased dramatically since the 1970s. Because readily degradable organic compounds – in particular volatile fatty acids – are required for enhanced biological phosphorus removal, fermentation can be used in treatment processes. Metal hydroxide chemistry and surface complexation lead to ways to reduce chemical usage for tertiary phosphorus removal. Alternative carbon sources are available for denitrification. These findings provide the theory that can be implemented to improve nutrient removal efficiency and reliability while reducing treatment costs.
The performance and reliability of nutrient removal treatment plants can be determined by considering the fate of individual nitrogen and phosphorus species during conventional and advanced treatment processes. Inorganic species are efficiently removed, but the recalcitrant species limits the ability to meet the restrictive water quality limits. Data from benchmark full-scale nutrient removal facilities, along with data from special nutrient species characterizations, are used to identify the limits of technology and the reliability of attaining these limits.
This lecture presents the fundamentals of nutrient removal and its application to attain reliable nutrient removal. The topics covered include:
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2012 -- Vladimir Novotny
2011 -- James W. Patterson
2010 -- Morton A. Barlaz
2009 -- Rao Y. Surampalli
2008 -- Jeanette A. Brown
2007 -- Rudy J. Tekippe
2006 -- Jerome B. Gilbert
2005 -- N.C. Vasuki
2004 -- Gary S. Logsdon
2003 -- Cecil Lue-Hing
2002 -- James Crook
2001 -- Glen T. Daigger
2000 -- W. Wesley Eckenfelde
1999 -- R. Rhodes Trussel
1998 -- Richard D. Kuchenrither
1997 -- Orris E. Albertson
1996 -- Ira L. Whitman
1995 -- Daniel A. Okun
1994 -- Davis L. Ford
1993 -- Michael C. Kavanaugh
1992 -- C. Joseph Touhill
1991 -- William J. Carrol
1990 -- Paul L. Busch
1989 -- H. Gerard Schwartz, Jr.
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