sewage sludge Articles
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Pyrobustor - A Proven,Small-Scale, Biosolids-to-Energy Solution
27 municipalities in southern Germany set up a special-purpose entity called KSV GmbH for the specific purpose of disposing regional sewage sludge. The goals of this project were two-fold; eliminate the expensive cost of transporting sewage sludge over long distances and avoid incalculable costs by outsourcing sludge disposal. To achieve this, KSV GmbH installed the Pyrobustor® at the ...
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Pyrobustor for the thermal treatment of biosolids
ARA Pustertal AG operates the Tobler wastewater treatment plant in South Tyrol, Italy. The Tobler ARA facility is the fi rst and only water treatment plant in Central Europe that is housed in an underground cavern. The impressive cavern plant, whose tunnels are twice as large as that of a highway tunnel, began operation in July, 1996. The inclusion of a sludge drying plant and a thermal sludge ...
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Sewage Sludge Recycling to Land and Disposal
The Problem: Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent). A by-product of sewage treatment is usually a semi-solid waste or slurry, called sewage sludge, that has to undergo ...
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A comaprative perspective of US and UK thinking on e coli reactivation in digestion and dewatering
Presentation Outline UK and US rules in Pathogens History of Reactivation/Regrowth in US WERF Projects Correlation to odors UK Situation Conclusions US and UK regulations The USEPA regulations are mandatory USEPA 503.15 The Class A pathogen requirements on 503.32 (a) or the Class B pathogen requirements in 503.32 (b) shall be met when bulk sewage sludge is applied to agricultural ...
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Development of a novel epigeic-anecic-based polyculture vermireactor for efficient treatment of municipal sewage water sludge
The potential of vermireactors, based on polyculture and monoculture system, was evaluated by using substrate consisted of domestic sewage sludge mixed with sugarcane trash, under laboratory conditions. Polyculture reactor was designed by using an epigeic (Eisenia fetida) and an anecic (Lampito mauritii) species of earthworm, while monoculture reactor had E. fetida only. Comparatively the end ...
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Large scale reality of sewage sludge paseteurisation and thermal hydrolysis
ABSTRACT Two large scale projects have been successfully brought on line utilising the thermal pretreatment to ensure production of a Class A biosolid product. In Reading (UK), the sludge is pasteurised prior to mesophilic anaerobic digestion while in Dublin (Ireland), the sludge is both pasteurised and hydrolysed prior to digestion. Sludge is pasteurised by holding a batch of sludge at 70°C ...
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Microbial safety of air-dried and rewetted biosolids
To assess microbial safety of treated sewage sludge (biosolids), we examined the inactivation of microbial indicators for potential bacterial, viral and protozoan pathogens. The levels of indicators were determined throughout the air-drying and storage phases of anaerobically digested sewage sludge. Samples were collected from two wastewater treatment plants (WWTPs) in Victoria, Australia. ...
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Cadmium ion removal by electroflotation onto sewage sludge biomass
Non–living, anaerobically digested, Activated–Sludge (AS) was examined (laboratory–scale experiments) as possible biosorbent for the removal of cadmium from dilute aqueous solutions. The application of electroflotation to the suspended biomass, was investigated in this paper as an effective solid/liquid separation technique for the metal–loaded biosorbent particles. The main parameters ...
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Land application of sewage sludge (biosolids) in Australia: risks to the environment and food crops
Australia is a large exporter of agricultural products, with producers responsible for a range of quality assurance programs to ensure that food crops are free from various contaminants of detriment to human health. Large volumes of treated sewage sludge (biosolids), although low by world standards, are increasingly being recycled to land, primarily to replace plant nutrients and to improve soil ...
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Optimization of a microwave-assisted extraction procedure for the determination of selected alkyl, aryl, and halogenated phenols in sewage sludge and biosolids
A microwave-assisted extraction method for the determination of 15 alkyl, aryl, and halogenated phenols in sewage sludge and biosolids samples was developed and optimized. The effects of solvent, temperature, time, moisture content, acid, and number of extractions on the recovery of phenols were evaluated. Results indicated that extraction solvent had the greatest impact on the recovery of ...
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Efficiency of RO/NF membranes at the removal of veterinary antibiotics
The production of pharmaceuticals has increased rapidly during the last several decades as they have been used for the health of both humans and animals. Routes of environmental exposure include the release of treated wastewater, the land disposal of livestock manures and municipal biosolids (i.e. sewage sludge), as well as the use of medicated aquaculture feed. This study deals with application ...
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Changing Biosolid Technology to Safely Remove PFAS Chemicals
Per and Polyfluoroalkyl substances (PFAS) are ubiquitous. Known as “forever chemicals,” the man-made carbon-fluorine bond is one of the strongest bonds found in nature. PFAS is fast to build up in humans, animals and the environment and very difficult to break down. These substances were developed in the 1940s and 50s and applied to products that range from cookware to dental ...
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The effect of direct addition of iron(III) on anaerobic digestion efficiency and odor causing compounds
The role of iron addition to sewage sludge prior to anaerobic digestion was evaluated to determine the effect of iron on digestion performance and generation of odor-causing compounds. Hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) were the odorous gases evaluated in this study. Samples were obtained from seven municipal wastewater treatment plants (WWTPs), and batch ...
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Responses to Internet misinformation
How do people figure out what is accurate and what is not? Science, involving diverse researchers reviewing data and repeating experiments, is the basis for understanding reality. Biosolids recycling has been the subject of such science. And we point to that science on our website, letting our readers decide. Recent Internet postings by Joseph Mercola, David Lewis, and others* - who imply ...
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Thermal hydrolysis, anaerobic digestion and dewatering of sewage sludge as a best first step in sludge strategy: full scale examples in large projects in the UK and strategic study including cost and carbon footprint.
Abstract This paper shows that by using thermal hydrolysis process (THP) as a pre-treatment for anaerobic digestion (AD) it is possible to develop a step wise approach to sludge strategy that is cost effective and flexible. By generating a low volume of non odorous, well dewatered and safe digested cake it is possible to recycle sludge directly to agriculture or dry it for fuel use or ...
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V-Bank Transition (VTS) - Robert O. Pickard Environmental Centre, Ottawa, Canada - Case Study
THE PROBLEM: The RobertO. Pickard Environmental Centre (ROPEC) in Ottawa, Canada was undergoing needed upgrades and expansions to its thickening and dewatering building. This building plays a vital role by in water treatment providing sewage receiving and pumping, sludge mixing and thickening, as well as dewatering digested biosolids. These processes release H2S, Ammonia, and other VOC's into ...
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Fluidized Bed Biosolids Disposal Gasification Case Study
Summary: In 2007, the Sanford, Florida, Utility Department sought to identify an onsite biosolids management and disposal system that could be integrated within their South Sanford Water Treatment Facility. The intended biogasification system would be a cost effective long–term solution, that is regulatory compliant and environmentally ...
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10 tips for journalists covering biosolids
For 20 years, I've worked with reporters and journalists on their coverage of biosolids and related topics. I'm speaking here of professionals who write fact-based news or feature articles, not those who write opinion-based pieces or columns that reflect and include their personal bias and/or advocacy. What these reporters and journalists do is important, serving as conduits of useful ...
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