sludge pathogen Articles
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Thermal hydrolysis of the lipid and protein fractions of wastewater sludge: implications for digester performance and operational considerations
ABSTRACT Thermal hydrolytic pretreatment of wastewater sludge followed by mesophilic anaerobic digestion poses significant benefits in terms of sludge minimization and pathogen reduction; however, high levels of volatile fatty acids (VFA) in digester effluent reveal an interruption in the efficient conversion of organic material to methane gas. Residual soluble chemical oxygen demand (COD) not ...
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Verification of an alternative sludge treatment process for pathogen reduction at two wastewater treatment plants in Victoria, Australia
At South East Water wastewater treatment plants (WwTPs) in Victoria, Australia, biosolids are stockpiled for three years in compliance with the State guidelines to achieve the highest pathogen reduction grade (T1), suitable for unrestricted use in agriculture and landscaping. However, extended stockpiling is costly, may increase odour nuisance and greenhouse gas emissions, and reduces the ...
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Combined experiences of thermal hydrolysis and anaerobic digestion – latest thinking on thermal hydrolysis of secondary sludge only for optimum dewatering and digestion.
ABSTRACT The basic principles of batch thermal hydrolysis process (THP) are well known as a pre-treatment to anaerobic digestion (AD) . Early work done in the 70s in the USA and the 80s in Japan demonstrated the optimum time and temperature for thermal hydrolysis being 340 F for 30minutes. These principles have been put into full practice in 20 plants around the world at plants ranging from 5 ...
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The Challenges of Sludge and Slurry Waste Treatment
Valorising sludge and slurry Municipal waste treatment plants, among other processes, generate sludge and slurry-type waste that requires treatment. It is necessary to apply different technologies in line with the characteristics and components of the waste to be treated. Waste can be processed and valorised using waste-to-product methods, thereby generating fuels or products that can be used as ...
By TECAM
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In-toilet disinfection of fresh fecal sludge with ammonia naturally present in excreta
A simple treatment method, Safe Sludge disinfection, was developed to disinfect pathogens in fresh fecal sludge using the ammonia naturally present in excreta. In the first step, urea is hydrolyzed to ammonia (NH3/NH4+). In the second step, Ca(OH)2 is added to raise the pH level such that NH3, a known disinfectant, is the dominant form of ammonia; subsequently, the waste is stored until ...
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Advanced anaerobic processes to enhance waste activated sludge stabilization
The requirement for enhanced stabilization processes to obtain a more stable, pathogen-free sludge for agricultural use is an increasing challenge to comply with in the waste hierarchy. With this in mind, the Routes European project (‘Novel processing routes for effective sewage sludge management’) is addressed to assess innovative solutions with the aim of maximizing sludge ...
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Enhanced stabilisation of sewage sludge through thermal hydrolysis – three years of experience with full scale plant
ABSTRACT The first full-scale plant for sludge disintegration through Cambi thermal hydrolysis was started up in Hamar, Norway at the end of 1995. It is the first plant with a new design where sludge is directly heated by live steam. During the last 3 years the plant worked with an availability of over 99 %. Prior to hydrolysis the sludge is dewatered and the digester is fed with 10-12 % DS, ...
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Somatic coliphages as surrogates for enteroviruses in sludge hygienization treatments
Conventional bacterial indicators present serious drawbacks giving information about viral pathogens persistence during sludge hygienization treatments. This calls for the search of alternative viral indicators. Somatic coliphages’ (SOMCPH) ability for acting as surrogates for enteroviruses was assessed in 47 sludge samples subjected to novel treatment processes. SOMCPH, infectious ...
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Hygienization of sludge through anaerobic digestion at 35, 55 and 60 °C
Legislation in Sweden and the European Union concerning the use of sewage sludge in agriculture is under revision and future concentration limits for pathogens in treated sludge are likely to be expected. The aim of this study was to evaluate the hygienization of Salmonella, Escherichia coli, Enterococcus and Clostridium perfringens through continuous anaerobic digestion at 35, 55 or 60 ...
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Inactivation of Ascaris eggs and Salmonella spp. in fecal sludge by treatment with urea and ammonia solution
Ammonia sanitisation is a promising treatment alternative for inactivation of pathogens in fecal sludge intended for agricultural use. Inactivation of Ascaris eggs and Salmonella spp. was studied in fecal sludge at ≥28 °C treated with low doses of urea, and in fecal sludge at ≤17 °C treated with high doses of ammonia solution. The effect of ammonia and carbonate on Ascaris inactivation in ...
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Aerzen USA, Albertville WWTP - Case Study
Segment: Environmental engineering Problem: WWTP uses fuel boilers Solution: AERZEN Biogas packages Results: Reduces operating cost by using biogas solution Background Albertville, Ala., is a small city on Sand Mountain, a 26-squaremile plateau in the northeast corner of the state. The Municipal Utilities Board (MUB) of Albertville operates the MUB Waste Water Treatment Plant (WWTP), an 11.5 ...
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Scottish Water - Edinburgh - Seafield - Case Study
Client: Scottish Water Solution: CambiTHP - B6 Seafield On 2 October 2013, MWH Treatment awarded Cambi a contract for the installation of two lines of Cambi’s modular THP B6 system, at Stirling Water’s Seafield Waste Water Treatment Works, Edinburgh, Scotland. Each line is capable of treating 50 dry tonnes of sewage sludge per day. The choice of THP system was made using a ...
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Infectious helminth ova in wastewater and sludge: A review on public health issues and current quantification practices
Raw and partially treated wastewater has been widely used to maintain the global water demand. Presence of viable helminth ova and larvae in the wastewater raised significant public health concern especially when used for agriculture and aquaculture. Depending on the prevalence of helminth infections in communities, up to 1.0 × 103 ova/larvae can be presented per litre of wastewater and 4 gm ...
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What Is the Sludge Treatment Process?
Raw, untreated sewage is a serious hazard to the environment as well as to the nearby population. However, through proper treatment, wastewater facilities can keep up with demand, reduce pathogenic risks, and reintroduce clean water back into the environment. Learn more about the role of sludge treatment in improving wastewater processing. Sewage Sludge When municipal wastewater treatment ...
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The economics of advanced digestion
Abstract Historically, the focus sewage sludge digestion was to stabilise the sludge and reduce the odour emitted. Pathogen reduction, solids destruction and biogas production then became important. In recent years a number of advanced digestion processes have become available which can be added to the conventional digestion process. Initially advanced treatment methods for treating sludge were ...
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The effect of mixing conditions on anaerobic digester performance
The basic principle of aerobic wastewater treatment is the conversion of some parts of organic matters to biomass and this causes production of excessive sludge in aerobic processes. This excessive sludge is withdrawn from time to time to prevent accumulation of biomass in aeration basin. In most cases, this sludge requires the stabilization before the dewatering and disposal. Different processes ...
By ORBIT e.V.
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Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-I: performance evaluations
Abstract This paper reports on the ability of an enzymatic pre-treatment to significantly improve the conditioning of wastewater sludges (biosolids) significantly using by a polymeric flocculant. Experiments used anaerobically digested biosolids samples from two different municipal wastewater treatment facilities, and a formulation containing several different hydrolytic enzymes. Samples were ...
By JBMbio.com
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What is a Sewage Treatment Plant & How does it work?
It might surprise you to know that we all drink and bathe in recycled water. The water we flush down the toilet is turned into potable water, and it is the job of sewage treatment plants to make this water fit for human consumption or release into rivers and oceans. Wastewater from sinks, baths, washing machines, toilets and other appliances has to go somewhere. After traversing ...
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The function of sludge drying
Drying the sludge has the following advantages: (1) Reduction: Due to the high water content of the sludge, the volume is large and fluid. After the above process, the volume of sludge is reduced to one tenth of the original, and it is converted from liquid to solid, which is convenient for transportation and consumption. (2) Stabilization: The sludge has a high content of organic matter, which ...
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Frequently Asked Questions and Troubleshooting in Activated Sludge Process (Part 3)
Q: What indicators can be detected for the microbiological ratio? And how can it be measured? Answer: The microfood ratio refers to the ratio of the organic matter content to the activated sludge concentration in the biochemical system before entering the biochemical system. Through this ratio, the load can be judged and the operation can be adjusted to avoid sludge aging and overage as well as ...
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