Download or read book The Effects of Toxic Organics on Activated Sludge Performance written by Nolan Arthur Randall and published by . This book was released on 1983 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Organic Toxic Compounds on the Performance of a Batch operated Activated Sludge Process written by Gye Dae Whang and published by . This book was released on 1979 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessing the Effects of Toxic Synthetic Organic Compounds on Activated Sludge Communities written by Kristopher Michael Lightsey and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent technological advances in environmental monitoring coupled with the increasingly stringent effluent requirements being placed on waste treatment systems makes it vital to have a more complete understanding of how specific compounds in waste streams can impact wastewater treatment processes. Since activated sludge processes are recognized as one of the most often applied technologies in wastewater treatment, this study assesses the impacts of select toxic synthetic organic compounds (SOCs) on the activated sludge communities in two types of wastewater treatment reactors: a completely-mixed activated sludge reactor (CMAS) and a sequencing batch reactor (SBR). Commonly applied activated sludge monitoring parameters, such as solids analysis and substrate removal, are collected and correlated to the results of microscopic image analysis (IA) and direct gradient gel electrophoresis (DGGE) to monitor the response of the activated sludge communities to variations in operational conditions, including the incorporation of SOCs in the influent feed and varying the solids retention time. The results of this research indicate that the response of the activated community is highly dependent on the reactor configuration. The CMAS settling performance was more strongly correlated to the shape parameters, and the SBR settling performance was more strongly correlated to the size parameters, which is qualitatively supported by particle settling theory when considering that SBR flocs were found to be larger than the CMAS flocs. The SBR began to exhibit larger floc sizes and had a higher sludge volume index with the incorporation of SOCs, while the CMAS flocs became more spherical after SOCs were incorporated and exhibited more discrete settling. The molecular analysis results revealed that the community structure within the activated sludge system was transient in response to environmental variations. Banding patterns indicated that samples were more similar to other samples taken from the same reactor under the same operational conditions. Thus, as operational conditions were varied, sample banding patterns would also change, indicating transitions in the genetic composition, and ultimately the dominant species present, in response to environmental changes.

Download or read book Fate of Toxic Organic Compounds in Activated Sludge and Integrated Activated Sludge written by B.E. Jones and published by . This book was released on 1984 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Activated Sludge written by Wesley Eckenfelder and published by CRC Press. This book was released on 1998-03-11 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, industrial wastewater treatment primarily focused on the removal of BOD and suspended solids. In recent years, however, the focus has changed to aquatic toxicity, priority pollutants, and volatile organics. This required changes in how we design and operate biological treatment plants. Many existing plants must be retrofitted. New approaches to meet new requirements are discussed in detail. The authors, with a combined experience of sixty years, have presented case studies for a wide variety of industrial wastewaters including pulp and paper, food processing, chemical and pharmaceuticals, and textile wastewaters. Data interpretation and process design are developed through the use of seventeen examples. Procedures for the laboratory and pilot plant generation of process design data are presented. Emphasis is placed on meeting the many new regulations governing industrial wastewater discharges.

Download or read book The Activated Sludge Process written by Benjamin Lefebvre and published by . This book was released on 2019-02-05 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this collection, the authors report on the pretreatment methods for waste activated sludge based on pulsed electric field and corona discharge techniques. The effects of pulse magnitude, frequency, temperature and pretreatment time are demonstrated on the basis of cell membrane electroporation. The influence of voltage polarity, frequency, magnitude, treating time and temperature has also been demonstrated. A description of fundamental techniques in molecular biology for the analysis of the microbiota of activated sludge is provided. Activated sludge is a heterogeneous system of organisms, organic and inorganic material, and therefore giving a specific protocol for each molecular technique would be imprudent. The authors go on to discuss the Monod model, which provides a functional relationship between specific growth rate and substrate concentration in the bulk. Important research efforts dedicated to adequate use of the Monod model are presented, consolidating knowledge from activated sludge and biofilm modelling, identifying misdirections, and setting parameters for further research. In one study, different microwave power outputs and times were optimised for sludge solubilisation without evaporation loss in waste activated sludge from two different sources. The variable effects of pre-treatments on extracellular polymeric substances fraction, cellular oxidative stress and solubilisation of both sludges were evaluated to understand the impact of sludge complexity. The penultimate chapter examines how toxic carbon sources can cause higher residual effluent dissolved organic carbon than easily biodegraded carbon sources in the activated sludge process. Based on the variations of chemical components of activated sludge, mainly intracellular storage materials, extracellular polymeric substances and soluble microbial products, the performance and mechanism of toxic carbon on the activated sludge process can be clarified. The purpose of the final study is to research the supplementation of different concentrations of substrate on the degradation rate of xenobiotics, and to determine the optimal concentrations of auxiliary substrates that are most beneficial. The results show that sugar and peptone can affect 2,4-D degradation rate by several different degrees at different concentrations.

Download or read book The Performance of Completely Mixed Activated Sludge Systems Treating Synthetic Organic Compounds written by Rebecca Leigh Buddin and published by . This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control of Organic Substances in Water and Wastewater written by and published by . This book was released on 1983 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biodegradation of Selected Organic Nitrogen Compounds in Activated Sludge Systems written by Jia Guo and published by . This book was released on 2010 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Activated sludge systems are commonly used to remove organic matter and nutrients from wastewater. They are also used to remove synthetic organic compounds from industrial activities. In this study, two identical activated sludge-based continuous stirred tank reactors (CSTRs) were employed to study the biodegradation of melamine and 4-nitrophenol and their impact on wastewater effluent water quality and microbial structure and functions. Two CSTRs at steady-state conditions were fed with two synthetic organic nitrogen compounds, melamine and p-nitrophenol (PNP) for 12 hours on day 136 and 150, respectively, of an extended test. Melamine, although toxic to human and animals, presented no detrimental effect on bioreactor performance and it appeared to act as an inert soluble substance in the activated sludge system. After the shock loading, melamine was quickly washed out of the continuous flow system. Batch degradation studies confirmed that the activated sludge from the CSTR was not capable of degrading melamine. The other chemical p-nitrophenol (PNP), however, showed significant toxicity towards the activated sludge, although subpeaks of possible PNP degradation metabolites were detected by high performance liquid chromatography indicating that the PNP could be partially degradable by the activated sludge. After 12-h shock loading of PNP, significant inhibition of nitrification and bacterial activity by PNP resulted in a prolonged period (> 22 days) of deterioration of effluent water quality. The results indicate that the fate and toxicity of synthetic organic nitrogen compounds can be quite different in activated sludge systems, although both melamine and PNP increased total nitrogen concentrations in wastewater effluent.

Download or read book The Use of High purity Oxygen in the Activated Sludge Process written by John R. McWhirter and published by . This book was released on 1978 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Potential Health Effects from Persistent Organics in Wastewater and Sludges Used for Land Application written by Vimala A. Majeti and published by . This book was released on 1980 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations of Biodegradability and Toxicity of Organic Compounds written by Jan Dojlido and published by . This book was released on 1979 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fate of Toxic Organic Compounds in Activated Sludge and Integrated Activated Sludge carbon Treatment Systems written by Bruce Elliott Jones and published by . This book was released on 1984 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control Strategies for the Activated Sludge Process written by Thomas M. Keinath and published by . This book was released on 1980 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Toxicity of Mixtures of Organic Chemicals to Activated Sludge Microorganisms written by Edward L. Hall and published by . This book was released on 1995 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Activated Sludge written by N. F. Gray and published by Oxford University Press, USA. This book was released on 1990 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Activated sludge is the most widely used biological wastewater treatment process in the world, both for domestic and industrial purposes. This book reviews the major theoretical concepts and practical operational factors, and describes the complexities inherent in the process, which depends on a dense microbial population mixed in wastewater under specific aerobic conditions. It is an ideal reference source for scientists, and a useful troubleshooting guide for practicing engineers and plant operators.