sludge digestion Articles
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Kardzhali (BGR) Municipal Plants - Case Study
Digester: 2.150 m³ sewage sludge digestion Scope of services: sewage sludge digester agitator, flare, gas storage, gas equipment Start-up: ...
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Where To Find Money In Biogas
On the surface, wastewater treatment operations don’t appear to be handling precious material. But these facilities are actually processing a great deal of value every day. Sludge, a byproduct of wastewater treatment, turns out to be an entity worth cherishing. “Depending on treated sludge quality, the final product can be land applied, landfilled, incinerated, or composed,” ...
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Project - Biogas Desulfurization at ETAR do Norte (Portugal)
The Wastewater Treatment Plant (ETAR) do Norte is one of the largest in the central region of Portugal, serving several municipalities. The infrastructure is located in the area of Coimbra, Leiria, occupying 6 hectares of land; it receives effluents from about 250,000 inhabitants of several municipalities. It has the capacity to treat some 38,000 m3 of wastewater daily, of which 77% is domestic, ...
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The hydrolysis and biogas production of complex cellulosic substrates using three anaerobic biomass sources
In this study, the ability of various sludges to digest a diverse range of cellulose and cellulose-derived substrates was assessed at different temperatures to elucidate the factors affecting hydrolysis. For this purpose, the biogas production was monitored and the specific biogas activity (SBA) of the sludges was employed to compare the performance of three anaerobic sludges on the degradation ...
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Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge combined with anammox treatment of digestate liquor
The need to reduce energy input and enhance energy recovery from wastewater is driving renewed interest in high-rate activated sludge treatment (i.e. short hydraulic and solids retention times (HRT and SRT, respectively)). This process generates short SRT activated sludge stream, which should be highly degradable. However, the evaluation of anaerobic digestion of short SRT sludge has been ...
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Solare Klärschlammtrocknung in der Praxis - Erfahrungen auf der Kläranlage Glarnerland
The water purification plant Glarnerland produces yearly roughly 4 000 tons of digested sludge (DM 25 %). Through drying, partially using in agriculture and the rest burning in the county's waste incineration plant the final disposal of the sludge is solved. The new solar sludge drying plant uses solar energy and waste heat taken from the electrothermal power station. In the new solar drying ...
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Vivianite Heat Exchanger removal trial case study
On the vivianite-laden heat exchangers, the maintenance supervisor created a recirculation circuit and diluted JS 9325 to a fifty percent (50%) solution. They recirculated the diluted solution for 48 hours while raising the temperature of the solution to 110F. Upon opening the first heat exchanger, they observed a purple solution following by a half-inch (½”) sheet of vivianite scales popping off ...
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Aerobic thermophilic bacteria enhance biogas production
The enhancing effect of aerobic thermophilic (AT) bacteria on the production of biogas from anaerobically digested sewage sludge (methanogenic sludge) was investigated. Sewage sludge (5%, w/w) was incubated at 65°C with shaking for a few months to prepare the AT seed sludge. AT sludge was prepared by incubation of the AT seed sludge (5%, v/v) and sewage sludge (5%, w/w) at 65°C with shaking. The ...
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Evaluation of thermal steam-explosion key operation factors to optimize biogas production from biological sludge
Thermal steam-explosion is the most extended hydrolysis pretreatment to enhance anaerobic digestion of sludge. Thermal hydrolysis key parameters are temperature (T) and time (t), and the generally accepted values reported from full-scale information are: 150–230 °C and 20–60 min. This study assesses the influence of different temperature–time–flash combinations (110–180 °C, 5–60 min, 1–3 ...
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Novel anaerobic digestion process with sludge ozonation for economically feasible power production from biogas
A novel process scheme was developed to achieve economically feasible energy recovery from anaerobic digestion. The new process scheme employs a hybrid configuration of mesophilic and thermophilic anaerobic digestion with sludge ozonation: the ozonated sludge is first degraded in a thermophilic digester and then further degraded in a mesophilic digester. In small-scale pilot experiments of the ...
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The benefits of heat regeneration in heat exchanger systems
Heat exchangers which employ heat recovery or regeneration should not be confused with ‘regenerative heat exchangers,’ which are a specific type of heat exchanger. What we mean by heat regeneration at HRS is the recovery of as much surplus heat (or cooling capacity) as possible after the primary function of the heat exchanger has been performed. This can then be reused to either ...
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Anaerobic Digestion process monitoring and enhanced biogas production - Case Study
The SENTRY system was installed July 2017 at CNETE (Centre National en Electrochimie et en Technologies Environnementales) or National Center in Electrochemistry and Environmental Technologies testing facility in Quebec, Canada. A system was installed in two duplicate Anaerobic Digesters processing waste activated sludge. A pre-treatment step was added to one of the reactors, and the differences ...
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Procurement and installation of a Biogas desulphurization unit at the Chania WWTP - Case Study
A proposal based on Bioconservacion’s technology was selected as the winning bid in the public tender released in 2015, covering the design, procurement and construction of a biogas desulfurizing unit to be installed in the waste water treatment plant in Chania, Greece. With a population over 100,000, Chania is the second largest municipality in the Greek island of Crete. Its waste water ...
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HRS helps AD plant tap into additional heat from existing CHP
Operators of anaerobic digestion (AD) plants know how important it is to optimise energy use across all stages of the process. That is why many recapture as much heat as possible for reuse elsewhere, including from the hot exhaust gases generated by the combined heat and power (CHP) engines which turn the biogas from the AD plant into useful heat and electricity. Heat exchangers used for exhaust ...
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Machines and Technologies in Biogas Facilities
MACHINES, EQUIPMENT AND TECHNOLOGIES IN THE BIOGAS LINEIN WWTP A wastewater treatment plant (WWTP), also called a purification plant, has the generic objective of achieving, from black or mixed water and through different physical, chemical and biotechnological procedures, effluent water with better quality and quantity characteristics based on standardized parameters. In general, ...
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United Utilities, Davyhulme WWTW, CHP Plant - Case Study
At the Davyhulme wastewater treatment works (WWTW) in Greater Manchester, United Utilities is generating renewable energy from sewage gas that is created from sludge left behind after the treatment of wastewater. The produced energy is used to power the local plant and provide high levels of efficiency through embedded generation. United Utilities spent £100 million on the programme that ...
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New horizons for sludge
Increasing production worldwide, higher cost for disposal, tighter restriction sludge management solutions are in high demand. New technologies are rapidly multiplying, fueled as well by sludge’s potential as a source of energy and potential for phosphorus recycling. Several drivers are contributing to the need for sludge solutions. A global population of 7.5 billion ...
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Evaluation of treatment potential, biogas generation and sludge properties of an anaerobic claridigester
The anaerobic process for the treatment of municipal and industrial wastewater has been in practice for over a century. Apart from treatment of wastewater, the process has the advantage of lower sludge and biogas production that can save energy. Application of this process in a primary clarifier in such a way that there is simultaneous digestion of primary settled sludge and organic removal ...
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Biogas Treatment in WWTP
Wastewater treatment plants (WWTPs) are facilities that consume large amounts of energy (thermal and electrical), as a result of their operation, they produce large amounts of sludge. The anaerobic digestion of these sludges from wastewater treatment produces biogas, which, due to its concentration in methane (CH 4 ), constitutes a biofuel that can be used for energy production. The best ...
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LBV Captures Biogas from Anaerobic Digestion of Dairy Wastewater
The Customer: Laticínios Bela Vista Ltda. (LBV) is the fifth largest dairy food producer in Brazil with three plants processing over 3 million liters of milk per day. The company makes over 100 different products for LBV’s brands: Piracanjuba, Pirakids, Leitbom, and others. The Customer’s Needs: LBV expanded their plant in Bela Vista de Goiás and evaluated wastewater ...
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