laboratory digester Articles
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Experimental power of laboratory-scale results and transferability to full-scale anaerobic digestion
Anaerobic digestion is today internationally acknowledged as an environmentally sound process for energy and nutrient recovery from organic wastes, and it is the dominant sludge treatment technology in most countries’ wastewater treatment plants. Laboratory- or pilot-scale experiments are commonly used as a first step to investigate the potential of new ideas or to confirm research hypothesis ...
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Anaerobic thermophilic digestion of sewage sludge with a thickened sludge recycle
The process of anaerobic thermophilic digestion of municipal wastewater sludge with a recycled part of thickened digested sludge, was studied in semi-continuous laboratory digesters. This modified recycling process resulted in increased solids retention time (SRT) with the same hydraulic retention time (HRT) as compared with traditional digestion without recycling. Increased SRT without ...
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Phosphorus release mechanisms during digestion of EBPR sludge under anaerobic, anoxic and aerobic conditions
Three laboratory-scale digesters were operated in parallel under anaerobic, anoxic and aerobic conditions to reveal the release mechanisms of phosphorus when digesting enhanced biological phosphorus removal (EBPR) sludge. The variation rates of the parameters associated with phosphorus release were calculated and compared with that of a typical EBPR anaerobic process. The results show that both ...
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Thermal hydrolysis of waste activated sludge at Hengelo Wastewater Treatment Plant, The Netherlands
The thermal hydrolysis process (THP) is a sludge treatment technique which affects anaerobic biodegradability, viscosity and dewaterability of waste activated sludge (WAS). In 2011 a THP-pilot plant was operated, connected to laboratory-scale digesters, at the water board Regge en Dinkel and in cooperation with Cambi A.S. and MWH Global. Thermal hydrolysis of WAS resulted in a 62% ...
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Determination of the feasibility of using a portable x-ray fluorescence (XFR) analyzer in the field for measurement of lead content of sieved soil
Soil samples collected in housing areas with potential lead contamination generally are analyzed with flame atomic absorption spectrometry (FAAS) or other laboratory methods. Previous work indicates that field-portable X-ray fluorescence (XRF) analysis is capable of detecting soil lead levels comparable to those detected by FAAS in samples sieved to less than 125 μm in a laboratory. A ...
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The influence of temperature and SRT on high-solid digestion of municipal sewage sludge
The influence of temperature and solids retention time (SRT) on high-solid digestion of municipal sewage sludge was investigated in laboratory-scale reactors. Digestion with high-solid concentration reduces the required digestion volume and is advantageous for urban areas. The experimental conditions comprised total suspended solids (TSS) in digested sludge between 4.0 and 4.6%, temperatures ...
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Velocity gradient as a tool to characterise the link between mixing and biogas production in anaerobic waste digesters
Whilst the importance of mixing in anaerobic digesters to enhance process performance and gas production is well recognised, the specific effects of mixing regime on biogas production are not clear. Here, the velocity gradient is used to demonstrate the importance of minimally mixed zones in a digester, with computational fluid dynamics (CFD) models indicating that 20–85% of a ...
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A modified anaerobic digestion process with chemical sludge pre-treatment and its modelling
Activated Sludge Models (ASMs) assume an unbiodegradable organic particulate fraction in the activated sludge, which is derived from the decay of active microorganisms in the sludge and/or introduced from wastewater. In this study, a seasonal change of such activated sludge constituents in a municipal wastewater treatment plant was monitored for 1.5 years. The chemical oxygen demand ratio of ...
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Advanced Digestion Plant at Bran Sands design and construct experiences
Abstract In June 2007 Northumbrian Water awarded a design and construct contract to Aker Solutions for a new advanced digestion (AD) plant at their Bran Sands site on Teesside. Following laboratory trials, advanced digestion via thermal hydrolysis was identified as the preferred treatment process for the upgrade of Bran Sands Regional Sludge Treatment Centre (RSTC). The plant will treat ...
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Trials at a sewage treatment plant in Moscow Case Study
At Moscow WWTPs (Kuryanovsky and Luberetsky) ,each having water capacity of 2,5 mln m3/day, all mixture of primary and secondary sludge is digested at 53 °C with SRT=HRT 7 days. The volatile solid reduction (VSR) is about 43-46% and gas production is about 0.33 m3/kg VS fed. In order to increase VSR and gas production many different optimization variants were studied. One of them was ...
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Lab-scaled digestibility study of wastewater sludge treated by thermal hydrolysis
ABSTRACT High-solids mesophilic anaerobic digestion (HS-MAD) processes employing thermal hydrolytic pretreatment (THP) have gained much interest in recent years; primarily because they have been shown to produce Class A biosolids in accordance with EPA 503 regulations, but also because they represent an economical approach to the maximization of available anaerobic digester volume. The ...
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Organic Solid/Sludge Dubai, United Arab Emirates Case Study
Spread over an area of 1.02 million square feet, the 515,000 - square foot facility, currently employing 555 people, specialises in the manufacturing, canning and packaging of branded products. Items include powder milk, chocolate and bottled water. The Middle East has been identified as a region of tremendous growth potential for the client, and expanding their operation to meet growing market ...
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How Can Questron’s Automation of Digestion Procedures Improve Innovation and Efficiency in your Lab?
There is always something to do in a laboratory, whether it is dispensing, dilution, sample transfers, or standard preparation. On top of this, if you work in a lab, you probably have deadlines to meet, reports to file, publications to write, and the crushing pressure to produce more results. Staying on top of all this can be overwhelming—fortunately, Questron can help you! Questron ...
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Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates
Various leachate recirculation strategies were applied to a batch-wise operated solid-phase digestion system in laboratory-scale tests. Comparative experiments with both continuous and intermittent leachate recirculation revealed no advantages of a continuous flow. Results suggest that leachate recirculation should not be carried out continuously during process initialisation when methanogenesis ...
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Maize mono-digestion efficiency: results from laboratory tests
A laboratory experimental campaign was carried out in order to assess the optimal configuration for the anaerobic digestion of a mixture of sweet corn and ensiled maize. Batch hydrolysis tests were conducted at 35 and 55 °C and at four different particle sizes (2, 5, 20 and 50 mm) obtained by manual chopping and sieving. Chemical pre-treatment by 24 h incubation at various acid and alkaline pH ...
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Full-stream and part-stream ultrasound treatment effect on sludge anaerobic digestion
The use of ultrasound as pre-treatment to improve anaerobic digestion of secondary sludge has been established as a promising technology. There are great differences between lab scale and full-scale devices, regarding the relationship between the disintegration achieved and the energy supplied. Based on economic aspects, most of the full-scale plants use partial-stream instead of the full-stream ...
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