WERF Report Collection and Treatment (Project 00-CTS-4)
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Ebook only
Available as an ebook
Please purchase via www.iwaponline.comOpens in new window
Also part of Water Intelligence Online Digital Reference Library
Standard ePrice: £29.00
+ VAT
Screening and floatable controls are used at wastewater treatment, sanitary sewer overflow (SSO) and combined sewer overflow (CSO) locations. Screening is a preliminary treatment step and used to protect downstream equipment. Screening and floatable control is a means of removing visible inorganic and non-biodegradable organic material from further treatment processes or discharge. In CSO applications screening and floatable control avoids the discharge of visible objectionable material.
Screening and screenings handling are among the unpopular processes to deal with due to aesthetic and health concerns, odor, and the historically questionable reliability of the equipment. The operation and maintenance can be costly and labor intensive. Existing and proposed environmental regulations require floatables control from CSO and sanitary sewer overflow (SSO) sites, often at locations that are unmanned.
Screening was one of the first methods of removing large solids from wastewater. Coarse screens are used to protect equipment and remove larger objects from the wastewater. Fine screens will remove smaller material and some amount of organic material. Very fine screens or microscreens remove even smaller material and potentially replacing grit removal and primary treatment.
The type of screening device used at a particular location depends on the screen opening required and the flow rate. Peripheral devices, such as screenings washing and compaction, are often required to meet final disposal requirements. Generally, the finer the screen, the smaller the material to be removed, and the larger the unit to reduce the head loss through the process.
WERF identified the need to assess traditional and emerging screening technologies and provide a review of practices to ensure that new and upgraded facilities will be up-to-date, operator-friendly and reliable. This work reviews applications and issues associated with screening and their peripheral equipment and their use at various locations with a variety of treatment and handling goals.
Biological denitrification by heterotrophic bacteria is common in the wastewater industry in the U.S. and in drinking water processing in Europe. To facilitate heterotrophic...
This work used a combination of traditional microbiological and molecular approaches and modeling to advance understanding of decay processes in wastewater treatment. The overall goal was to...
The research presented in this report was performed in order to compile and better understand the state of the technology for wastewater pipeline renewal engineering methodologies and technologies...
The objective of this project was to develop and evaluate a practical technique to indicate the probability of the presence of bacterial pathogens in receiving waters. A practical method was...
This research investigates the use of submerged gas-permeable membranes for the delivery of oxygen to municipal wastewater. This approach is likely offer significant advantages over the...
Concerns about water quality degradation resulting from land appliation of manures and biosolids have elicited a wide array of national and state regulations. The regulations focus on P as the...
Over 90% of bacterial biomass exists in the form of biofilms. The ability of bacteria to attach to surfaces and to form biofilms often is an important competitive advantage for them over bacteria...
Enhanced biological phosphorus removal (EBPR) has been used for decades to remove phosphorus from municipal wastewater because it allows facilities to meet water quality goals while minimizing...