WERF Report 04-CTS-3T
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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
The sudden increase in indicator bacteria, including fecal coliforms (FCs) and E. coli, was evaluated at several full-scale facilities, in addition to the increase measured during cake storage. The results showed that the sudden increase was a statistically verifiable occurrence at some facilities, but not all, as was the additional increases measured during cake storage. The sudden increase and growth were much more prevalent in processes that utilized centrifuge dewatering compared to belt filter press dewatering. The sudden increase appears to be a result of the reactivation of indicator bacteria that become reversibly non-culturable (RNC) during digestion. Although other hypotheses, such as contamination and presence of inhibitors, cannot be ruled out in all cases. Only one plant that was sampled with high solids centrifugation did not show reactivation and/or regrowth and this plant was different from others in that it utilized thermophilic reactors in series. The results showed a good correlation between the digestion temperature and the reactivation potential and amount of reactivation measured after dewatering. As temperature of digestion increased, the amount of reactivation increased (for plants with reactivation). Similarly, this was generally true, on average for the extent of regrowth. The digestion SRT and VS reduction did not correlate well with reactivation or regrowth.
The objectives of this research were to investigate the factors impacting the effectiveness of metal salts in reducing the production of volatile organic sulfur compounds (VOSCs) in biosolids,...
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The overall goal of this project was develop approaches to manage the issues of regrowth, odors, and sudden increase (ROSI) of indicator and...
The drinking water and wastewater industries are interested in developing a better understanding of sources of fecal contamination. Microbial source tracking (MST) offers the potential to...
Influent toxicity can be a critical problem for publicly owned treatment works that use the activated sludge process as part of their treatment regime. In this project, the researchers developed...
UV photoreactors, especially those used for disinfection, have emerged as important alternatives to conventional treatment operations. UV dose represents the master variable in governing the...
Permitting the disposal of concentrate and other waste streams is often one of the most challenging tasks associated with the development and implementation of desalination projects. This study...
The general goal of this project is to validate test protocols that are commonly used to assess the stability of various biosolids products, and to specify a standard for each test method. Toward...
Direct analysis of potable water for pathogenic micro-organisms has generally been avoided by water suppliers because pathogens are frequently present intermittently and in low numbers. Direct...
This is a book for those operating and studying biological wastewater treatment plants.
It introduces the state-of-the-art in process systems analysis (modelling and...
Aeration, Mixing, and Energy: Bubbles and Sparks is the first book on bubbles and sparks, presenting the state-of-the-art on aeration and mixing technology for water and wastewater...