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During wet weather events, separate and combined wastewater collection systems deliver substantial amounts of storm water runoff to wastewater treatment plants. Often these flows inundate collection systems and treatment works creating bypasses of untreated or partially treated wastewater. The federal Clean Water Act (CWA), its amendments, and associated regulations have been attempting to address these concerns for nearly 30 years. These regulations, coupled with the wastewater treatment standards under the CWA, are posing immense challenges to the owner/operators of wastewater systems, who are also driven to provide the most cost-effective service to customers.
This project (WERF Project 00-CTS-6, "Best Practices for the Treatment of Wet Weather Wastewater Flows") undertook a review of currently available technologies to improve the performance and efficiency of wet weather wastewater treatment and also identified potentially beneficial technologies and methodologies that are emerging in this area.
The project report includes the types and characteristics of current technologies and methodologies available to ensure treatment of wet weather wastewater flows. The following are the categories of technologies are assessed in report: vortex separation, enhanced clarification, operational enhancements, flushing systems, and disinfection.
Guidance Document on Anaerobic Digester Foaming Prevention and Control Methods
The development of this WERF anaerobic digester (AD) foaming guidance document is based on the need for a specific detailed methodology that water reclamation and recovery facilities (WRRF)...
Surveillance and Investigation of the Illness Reported by Neighbors of Biosolids Land Application and Other Soil Amendments
The research team field-tested a draft 5-step protocol over the length of the project from May 2009 until October 2010 on XX number of complaints (20 from May 2009 to September 2010). The...
Workshop on Persistent, Bioaccumulative and Toxic Chemicals
The U.S. Environmental Protection Agency (U.S. EPA) is pursuing a number of initiatives dealing with various aspects of the identification and management of substances that are persistent, bio-...
Greenhouse Nitrogen Emissions from Wastewater Treatment Operations: Phase II Molecular Level Through Whole Reactor Level Characterization
Engineered biological nutrient removal (BNR) processes have been identified by the Intergovernmental Panel on Climate Change (IPCC) as potential contributors to atmospheric nitrous oxide (N2O)...
Improved Protocol for Classification and Analysis of Stormwater-Borne Solids
A large portion of impaired waterways are located in or near urban areas and are adversely influenced by stormwater-borne solids. The solids have negative impacts on receiving water systems...
Factors Affecting the Performance of Primary Treatment in Onsite Systems
Approximately 23 percent of the estimated 115 million occupied homes in the United States are served by onsite wastewater systems. The vast majority of onsite wastewater treatment systems include...
Fats, Roots, Oils, and Grease (FROG) in Centralized and Decentralized Systems
Fat, oil, and grease (FOG) is generated everyday by food preparation and cleaning activities conducted at commercial establishments and, on a smaller scale, by residential sewer usage. Another...
The Foreseeable Future for Water Planning: Time to Change
People and societies conceptualise and experience time in fundamentally different ways. This basic aspect of perception significantly influences the way we frame problems and conceive solutions....