Pathogen Destruction Efficiency in High Temperature Digestion

Werf Report Project 97-rem-2 (Werf Report) by D. M. Gabb

Publisher: IWA Publishing (Intl Water Assoc)

Written in English
Cover of: Pathogen Destruction Efficiency in High Temperature Digestion | D. M. Gabb
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  • Environmental Science,
  • Sewage treatment & disposal,
  • Science,
  • Environmental Studies,
  • Science/Mathematics,
  • Applied Sciences,
  • Environmental Engineering & Technology
The Physical Object
Number of Pages130
ID Numbers
Open LibraryOL8930553M
ISBN 101843396963
ISBN 109781843396963

The High Temperature Liquid Composting that is, the high temperature is equally distributed throughout the media. This and the improved digestion within the liquid composting process, reduces the treatment time for pasteurization while increasing the systems efficiency and reliability. This stage guarantees complete pathogen destruction. As a result of the high operating temperature, digestion is expected to occur within a short time period (6 days) and accomplish a high degree of pathogen reduction. ATAD systems are two-stage aerobic digestion processes that operate under thermophilic temperature conditions (40 to 80C) without supplemental heat. The high temperature zone usually extends only to within 4 to 8 inches of the surface. Therefore, turning is necessary, quite apart from its function in aerating the mass, for ensuring pathogen and parasite destruction, particularly if a composting period under six months is used. pathogen for pasteurization of this type of especially high initial levels of the target pathogen are anticipated. Table A-4 (Appendix 4) provides Determining the degree of destruction of.

In general, t hermophilic digestion processes potentially allow higher loadings with reduced hydraulic retention times, higher conversion efficiencies and pathogen disinfection while mesophilic digestion is more stable, less at risk from ammonia nitrogen toxicity and requires less process heat (Yirong et .   Anaerobic digestion of waste activated sludge (WAS) is most commonly used at wastewater treatment facilities to stabilize the sludge. However, poor biodegradation efficiency of sludge and longer retention times (20–30 days) are the major limitations of anaerobic digestion method, which can be overcome by disintegrate the sludge and make intracellular material readily available to Cited by: -when a macrophage with a TLR on its surface binds to an invading pathogen, it releases the cytokine called interleukin-1 (IL-1) which traces to the brain via the blood-IL-1 causes neurons in hypothalamus to raise body temp and induce fever-this increased temp promotes the activity of phagocytic cells and impedes the growth of some microorganisms. Since high temperatures are fundamental in aerobic composting and destruction of pathogen, there is little to be done about controlling temperatures other than to avoid temperature above °F. Some materials, such as cellulose and porous fibrous matter, have the capacity to absorb or hold moisture and volatile substances, thereby reducing the.

Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials. Incineration and other high-temperature waste treatment systems are described as "thermal treatment".Incineration of waste materials converts the waste into ash, flue gas and heat. The ash is mostly formed by the inorganic constituents of the waste and may take the form of. Anaerobic digestion is a sequence of processes by which microorganisms break down biodegradable material in the absence of oxygen. The process is used for industrial or domestic purposes to manage waste or to produce fuels. Much of the fermentation used industrially to produce food and drink products, as well as home fermentation, uses anaerobic digestion. Which of the following organisms has a high lipid content of the cell wall? The destruction of all pathogens and their products is termed. Disinfection. An agent which destroys yeasts and mold is termed a/an. Fungicide. An agent which liberates gases or fumes for the purpose of destruction of insects and microorganisms is called.

Pathogen Destruction Efficiency in High Temperature Digestion by D. M. Gabb Download PDF EPUB FB2

Pathogen Destruction Efficiency in High-Temperature Digestion (Werf Report) [Gray (Gabb), Donald M., Hake, John M.] on *FREE* shipping on qualifying offers. Pathogen Destruction Efficiency in High-Temperature Digestion (Werf Report)Cited by: 1.

The purpose of this Pathogen Destruction Efficiency in High Temperature Digestion book was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards. The project was split into three phases.

Phase 1 screened three bench-scale thermophilic anaerobic process configurations at three different thermophilic temperatures based on their fecal coliform destruction. Pathogen destruction and process performance comparisons of the various process configurations are presented for each phase of the study.

Based on the fecal coliform data presented here, an empirical model was developed for quantitatively comparing multiple stage and single-stage thermophilic anaerobic digester performance. Pathogen Destruction Efficiency In High Temperature Digestion Donald M.

Gray (Gabb) pages IWA Publishing. In fact, this project resulted in a patent that was obtained by WERF for a cost-effective process to produce pathogen-free Class A biosolids.

The project also presents comparable data on pathogen destruction and process performance for several thermophilic anaerobic digestion process configurations, and demonstrates at bench scale that two thermophilic anaerobic digestion process.

Free Online Library: Pathogen Destruction Efficiency in High-temperature Digestion: Final Report (ENVIRONMENTAL TECHNOLOGY, Brief Article, Book Review) by "SciTech Book News"; Publishing industry Library and information science Science and technology, general Books Book. In Phase 3, the single-stage thermophilic anaerobic digestion process was compared to the single-stage mesophilic process at full scale (MG digesters) based on fecal coliform and pathogen destruction, process performance, digested sludge dewaterability, and odor generation.

The purpose of this research was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards. The project was split into three phases. Phase 1 screened three bench-scale ther.

Pathogen Destruction Efficiency In High-Temperature Digestion. Date Published. Mar 5, Resource Type. Executive Summary. Pathogen Destruction Efficiency in High-Temperature Digestion.

Report #97REM2PDF. 04/30/ 04/30/ West Quincy Avenue Denver, CO It combines the fundamental hydraulic, thermal and biokinetic mechanisms responsible for pathogen destruction during anaerobic digestion and has potential application as a tool for assessing the effects of operational management practices on the efficiency of pathogen removal by Cited by: Pathogen Destruction Efficiency in High-Temperature Digestion Since the advent of the U.S.

E nvironmental Protection Agency’s 40 CFR Pa rt Regulations in 1 9 9 3,more wa s t ewater utilities hav e focused on the use of thermophilic anaer-obic digestion (TAD) in the production of Class A biosolids. The higher tempera. The effect of temperature on pathogen survival was also reported by other researchers.

Iwasaki et al. () reported that after 12–15 day digestion, complete destruction of Coli-aerogenes and Enterococcus in a thermophilic biogas plant and a decline in the viable numbers in mesophilic by: 5. Pris: kr. E-bok, Laddas ned direkt. Köp Pathogen Destruction Efficiency In High Temperature Digestion av Donald M D Gray på pathogen destruction required.

Table 1 (p. 2) provides a brief introduction into some of the digester process options. Table 1. Common digester configurations Mesophilic digestion is by far the most common method of digestion, followed by thermophilic. Other methods, such as.

The survival of pathogens during anaerobic digestion is mainly influenced by the treatment temperature and the retention time with increasing temperature and retention time resulting in increasing. Table #A-3 contains information on the destruction of Listeria monocytogenes.

Lethal rate, as used in this table, is the relative lethality of one minute at the designated internal product temperature as compared to the lethality of one minute at the reference internal product temperature of ˚F (70˚C) (i.e.

z = ˚F [˚C]).File Size: KB. Pathogen Destruction Efficiency In High Temperature Digestion. Author(s): DM was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S.

EPA biosolids Class A pathogen standards. The project was split Read more. DM Gabb RSS feed DM Gabb RSS feed. How to order. Agents. The latest from @IWApublishing. Pathogen destruction efficiency in high temperature digestion: WERF report (project REM-2).

[Donald M D Gray; John M Hake] -- The purpose of this research was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards.

Affecting Anaerobic Digestion Temperature Two distinct temperature ranges are most suitable for biogas production, and different bacteria operate in each of these ranges. Mesophilic bacteria optimally fu n ct io he9 0˚F1 ra g.T m p l bacteria are most productive in the ˚F to ˚F range.

Thermophilic digestion kills more pathogenicFile Size: KB. Although concentrations are typically over twice normal digestion, the additional load is approximately 20 to 30 percent higher when VS destruction is higher.

The biology of a THP anaerobic digester (THP-AD) is different than a conventional digester and is conditioned to both the high loading rates and high ammonia concentrations. During a thermal destruction process, such as pasteurization, the rate of destruction is logarithmic, as is their rate of growth.

but with the recognition of each new pathogen, the required time temperature relationships are continuously being examined. very high temperatures for very short times (e.g., oC for s) are favoured. Amongst the benefits presented by anaerobic digestion, it has also been associated with a reduction of pathogen occurring in cattle manure.

Inactivation of these zoonotic pathogens does occur under both temperature conditions, however; the degree of reduction in mesophilic temperature is lower compared to thermophilic temperatures [ ].Cited by: The mesophilic bacteria used in digestion can function at a range of 85 degrees F.

to degrees F. with the optimum range for normal digestion at 90 degrees F. to 98 degrees F. Advanced Anaerobic Digestion Study Guide - June EditionFile Size: KB. Sludge pretreatment before aerobic digestion to enhance pathogen destruction Article in Canadian Journal of Civil Engineering 36(5) May with 12 Reads How we measure 'reads'.

The patent was given to the Foundation for a process it developed in a project called “Pathogen Destruction Efficiency in High Temperature Digestion.” As the name suggests, the process is a high-temperature anaerobic digestion process, and it can provide a low-cost method for achieving Class A pathogen standards in biosolids at both large and small wastewater treatment plants.

Treatment of domestic sewage sludge is required to minimize the risk of adverse health effects from pathogens in biosolids applied toEPA published regulations establishing the processes and conditions it deemed necessary to minimize these risks. Unlike the chemical standards, the pathogen regulations are not risk-based standards but are operational standards intended to reduce.

TPAD1 system achieved the maximum methane production and pathogen destruction and it generated Class A biosolids according to Organic Matter Recycling Regulation of British Columbia at all operating SRTs, while the biosolids produced from the other digestion systems (control and TPAD2) could not meet the criteria for Class A and was classified Author: Bita Nazyab.

ing anaerobic digestion system to operate as a TPAD system, in which the first digesters were operated in the thermophilic range (50–60 °C [– °F]) to promote pathogen destruction with the intent of producing Class A biosolids, while subsequent digesters were operated in the mesophilic range (30–38 °C [85– °F]) to re.

The energy performance of the anaerobic digestion is depending mainly on the biogas production technology, raw materials and geographic location (ambient temperature).

Since the feedstocks coming to anaerobic digestion have usually lower heating value as received, the usual energy efficiency calculation used for incineration plant is not by: 1. Cold weather efficiency 6. Nitrification/pH effects 7.

Poor pathogen reduction Biochemical conversions in aerobic digesters include: Destruction of Biomass: C5H7O2N + 5O2 = 4CO2+H2O+NH4HCO3 NITRIFICATION OF RELEASED NH3‐N: NH4 ++2O 2+ = NO3‐+2H+ +H2O With complete nitrification.

Impacts of Anaerobic Digestion and Solid Liquid Separation on Pathogen Destruction 1. INACTIVATION OF DAIRY MANURE-BORNE PATHOGENSBYANAEROBIC DIGESTIONBecky Larson, Asli OzkaynakApril, 3, Mark Borchardt, Susan Spencer, and Spencer BorchardtUSDA –Agricultural Research ServiceUSGS Wisconsin Water Science Center 2.exception that the TPAD process provides increased pathogen destruction due to the high temperature first stage.

The VS reduction and methane yields for the slurry processes used for comparison range from 41 to 78% and to L/g VS fed, respectively. The TPAD system outperformed dry digestion processes.The objective of this study was to evaluate the performance of anaerobic digestion (AD) within the intermediate zone, specifically at 45°C.

Single-stage batch anaerobic digestion system was developed in the lab and performance was monitored for more than 2 years. The AD system was able to achieve high biogas production with about 62% - 67% methane by: 1.