digestion process Articles
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Thermo dynamical assessment of the digestion process
ABSTRACT Digestion of sludge was mostly seen as a stabilisation process prior to disposal or land application. During the last years there is an increased interest to use biogas as alternative energy source to replace the use of fossile fuels and giving the digestion process an economical value. In this paper a correlation is derived to combine the degradation of sludge with the amount of ...
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High dry solids digestion
Abstract Digestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an opening of ...
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High dry solids digestion
ABSTRACTDigestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an opening of cell ...
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Assessment of the state of the art of technologies for the processing of digestate residue from anaerobic digesters
Anaerobic digestion is widely used as an important source of renewable energy. With the increasing number and capacity of biogas plants also, adequate treatment technologies for whole digestate – the residue from anaerobic digestion – are gaining attention. In this study the state of the art of digestate processing is analysed, and currently used treatment schemes and the various ...
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Membrane thickening aerobic digestion processes
Sludge management accounts for approximately 60% of the total wastewater treatment plant expenditure and laws for sludge disposal are becoming increasingly stringent, therefore much consideration is required when designing a solids handling process. A membrane thickening aerobic digestion process integrates a controlled aerobic digestion process with pre-thickening waste activated sludge ...
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Aerators Enhance Aerobic Digestion Process
The city of Eden,N.C.,operates an extended aeration process designed for an average flow rate of 13.5 mgd with a mixed liquor suspended solids concentration that typically checks in about 6,000 mg/l. This high biomass concentration is necessary to provide a well-settling sludge and good effluent quality. Further, the plant influent is approximately 40% domestic wastewater and 60% industrial ...
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The Anaerobic Digestion of Bio-Waste in Developing Countries
The anaerobic digestion process is typically used as a means of waste disposal or energy production. Anaerobic digestion of bio-waste in developing countries is extremely beneficial as it doesn’t just generate clean and safe energy, it also contributes towards other economic development issues and has considerable environmental benefits. In this article we will explore the many benefits of the ...
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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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Co-digestion - Processes, potentials and organization Forms
Co-digestion of organic wastes together with livestock manure has received growing interest in Germany during the last 5 years because some waste acts have been changed in order to achieve a better protection of the environment and to promote the utilisation of wastes for the formation of renewable energy and secondary products which can substitute mineral fertilisers and conventional soil ...
By ORBIT e.V.
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An asymptotic observer-based monitoring scheme for a class of plug flow reactors
In this paper a monitoring tool is designed for a class of plug flow reactors whose mathematical model is described by a set of first-order partial differential equations with different coefficients in the convective terms. The infinite dimensional structure of such a tool is derived according to the methodology established in the design of the well-known asymptotic observer. As a consequence, it ...
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Beijing - Xiao Hong Men Water Reclamation Plant - Case Study
Xiao Hong Men Water Reclamation Plant On 10th of December 2014, Cambi was awarded the Xiao Hong Men contract, the second contract signed with our client, Beijing Drainage Construction Company. The project was finished in February 2017, making Xiao Hong Men the first operating Cambi plant in China, serving a population of two million people. Cambi Thermal Hydrolysis Process (Cambi B12) was part ...
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Wastewater treatment: how to prevent sludge settling in digesters
In municipal wastewater treatment plants, where large quantities of wastewater are treated and purified every day, anaerobic digestion is a key process for the sustainable reuse of stabilised sludge and its valorisation for energy purposes. In fact, anaerobic sludge digestion helps large wastewater treatment plants to: Stabilise the sludge and further reduce the pollutant load Valorise the ...
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Grease waste and sewage sludge co-digestion enhancement by thermal hydrolysis: batch and fed-batch assays
Grease waste (GW) is an adequate substrate for sewage sludge co-digestion since, coming from a waste water treatment plant, it has a high methane potential (489 NmLCH4/gVSin); however, no synergistic effect takes place when co-digesting with 52%VS grease. Conversely, thermal hydrolysis (TH) improves the anaerobic digestion of GW (43% higher kinetics) and biological sludge ...
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Start-up of a decentralized pilot plant for the anaerobic treatment of domestic wastewater
This paper is about the set-up and start-up of a decentralized anaerobic pilot plant for producing domestic service water from domestic wastewater. The plant consists of a two-stage anaerobic digestion process for degrading organic matter and a third-stage for ammonium removal using the Anammox process. Each reactor was started independently with synthetic wastewater of stage-specific ...
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Use of real-time PCR with propidium monoazide for enumeration of viable Escherichia coli in anaerobic digestion
A combination of propidium monoazide (PMA) with real-time quantitative polymerase chain reaction (PMA-qPCR) was optimized to enumerate only viable Escherichia coli in anaerobic digestion processes. Repeating the PMA treatment twice and a final concentration of 100 μM resulted in an effective exclusion of DNA from heat-treated E. coli cells. In three anaerobic digestion processes, real-time ...
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The positive effects of waste leachate addition on methane fermentation from food waste in batch trials
The purposes of this study were to investigate the effect of waste leachate (WL) addition on batch anaerobic digestion of food waste (FW), and to examine the influence of mixture ratio on the co-digestion process. The results showed that anaerobic digestion of FW was greatly enhanced by WL addition, as indicated by the higher methane yield, higher methane content, more volatile solids (VS) ...
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Test with the mobile unit on a municipal wastewater treatment plant
Tests carried out Sludge in recirculation on the oxidation tank, after dynamic thickener and in recirculation on the mesophilic and thermophilic digester. Goal Maximize the yield of the oxidation and digestion processes, increase dehydration and reduce the volume of sludge to be disposed of. Results COD 30 times greater on the cavitated sample taken on the water line and 4 times greater on the ...
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A review: factors affecting excess sludge anaerobic digestion for volatile fatty acids production
This paper presents a review of methods that improve the production of volatile fatty acids (VFA) from excess sludge during the anaerobic digestion process. These methods are mainly divided into two approaches. The first approach is located in the pre-treatment methods, which change the properties of the substrates, such as thermal pre-treatment, alkaline pre-treatment, microwave pre-treatment ...
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Optimization of municipal sludge and grease co-digestion using disintegration technologies
Many drivers tend to foster the development of renewable energy production in wastewater treatment plants as many expectations rely upon energy recovery from sewage sludge, for example through biogas use. This paper is focused on the assessment of grease waste (GW) as an adequate substrate for co-digestion with municipal sludge, as it has a methane potential of 479–710 LCH4/kg VS, as well as the ...
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Solid thickening and methane production of livestock wastewater using dissolved carbon dioxide flotation
Dilute manure is classified as wastewater due to the large quantity of water used in livestock production in Korea. Livestock wastewater treatment is required in order to reduce high moisture content and treat fluids discharged from the digestion process. In livestock wastewater treatment plants, large quantities of CO2 gas are produced at combined heat and power facilities as well as in the ...
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