anaerobic digester Articles
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Sequencing Batch Reactors - Case study
H2flow supplied the SAM SBR for treating this high strength wastewater. The wastewater is generated from dewatering wasted anaerobic digestion solids. In addition it supplied the glass fused to steel tanks as an integrated package. The tanks are covered with roofs and are 12m diameter by 7.4m tall. There is one equalization tank and two reactor tanks. There were a total of eight tanks ...
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A time-course analysis of four full-scale anaerobic digesters in relation to the dynamics of change of their microbial communities
This study describes the microbial community richness, -dynamics, and -organization of four full-scale anaerobic digesters during a time-course study of 45 days. The microbial community was analyzed using a Bacteria- and Archaea-targeting 16S rRNA gene-based Terminal-Restriction Fragment Length Polymorphism approach. Clustering analysis separated meso- and thermophilic reactors for both archaeal ...
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Foaming during anaerobic digestion: Causes and Solutions
Foaming during sludge treatment has traditionally been associated with activated sludge systems which have been victim to this phenomenon for several decades. However, foaming has been documented in anaerobic digestion plants, leading, fundamentally, to a reduction in digester capacity and an increase in operational expenditure. The requirements for foaming of: surface active agents, gaseous ...
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Applications of two-phase anaerobic degradation in industrial wastewater treatment
Prospects for the phased anaerobic treatment of wastewater are extremely promising. With the variety of reactor designs available and the amenability of reactors to modification, existing treatment systems may be replaced or upgraded as required to achieve increased stability, higher loading capacities and greater process efficiencies than single-stage systems. In recent times, various reactor ...
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Inter-stage thermophilic aerobic digestion may increase organic matter removal from wastewater sludge without decreasing biogas production
Combining aerobic and anaerobic digestion in a two-stage system can improve the degradation of wastewater sludge over the use of either technology alone. But use of aerobic digestion as a pre-treatment before anaerobic digestion generally reduces methane production due to loss of substrate through oxidation. An inter-stage configuration may avoid this reduction in methane production. Here, we ...
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Laboratory-scale anaerobic sequencing batch reactor for treatment of stillage from fruit distillation
This work describes batch anaerobic digestion tests carried out on stillages, the residue of the distillation process on fruit, in order to contribute to the setting of design parameters for a planned plant. The experimental apparatus was characterized by three reactors, each with a useful volume of 5 L. The different phases of the work carried out were: determining the basic components of the ...
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Performance results of the treatment of stillage using two-stage anaerobic digestion coupled to membrane filtration at different operating conditions
The production of ethanol is results in generation of large amounts of liquid residue (stillage). Anaerobic membrane bioreactors (AnMBRs) are a promising technology primarily for the treatment of high strength wastewater, having lower energy requirements as compared to aerobic ones and higher effluent quality as compared to conventional anaerobic reactors. AnMBR applied to stillage treatment ...
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Anaerobic digestion: a new model for plant-wide wastewater treatment process modeling
Abstract: This paper describes a new anaerobic digestion model for wastewater treatment systems (MantisAD). The model has been developed specifically for plant-wide wastewater treatment modelling. That is, rather than modelling nitrogen as a series of fractions of other carbonaceous state variables, this new model includes six dedicated nitrogen state variables. This structure makes this new ...
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Using Granular Sludge to Improve Digester Performance
Granular sludge technology compounds already impressive benefits of anaerobic digestion Anaerobic digestion is a robust process that transforms organic waste into valuable biogas for energy, as well as nourishing biosolids for agriculture. Applied in wastewater treatment, it also has the advantages of: Purifying even challenging, high-organic-load wastewater Lowering utility bills and ...
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Wastewater as a resource: a unique approach to achieving energy sustainability. Water Science & Technology
Abstract: A wastewater-treatment flowsheet was developed to integrate uniquely designed biological processes with physical-chemical unit processes, allowing conversion of the organic carbon in the wastewater to methane, the removal and recovery of phosphorus and nitrogen from the wastewater, and the production of water suitable for reuse. In the flowsheet, energy is derived from the wastewater by ...
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Dairy shed wastewater treatment and modelling by anaerobic digestion technology
There is a growing interest in the application of Anaerobic Digestion (AD) technology to Australian dairy farms not only for the reduction of environmental pollution caused by the effluents but also for recovering bioenergy. To be able to design and operate efficient AD systems, appropriate mathematical models need to be developed to observe and analyse the anaerobic process dynamics, such as the ...
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Mesophilic and thermophilic anaerobic digestion of source-sorted municipal solid waste
A change in existing collection systems for household waste is presently in progress in many Swedish municipalities. The objective is to separate the decomposable fraction from non-biodegradable waste in order to facilitate biological treatment and recycling of nutrients. The main reason for this development is the effort to replace landfilling of nutrient-rich, wet organic waste with sustainable ...
By ORBIT e.V.
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Turkish biogas monitored with AEMS
Application Anaerobic digestion – waste water Equipment AEMS Location Antalya, Turkey Customer Kuzu Group and General Directorate of Antalya Water and Wastewater Administration Requirement The customer was looking for: A low maintenance gas monitoring system Local sales support and service through Geotech’s distributor in Turkey, Ram Completely automatic operation Remote ...
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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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Nitrification of centrate from dewatering of anaerobically digested sludge
Nitrification of anaerobically digested sludge centrate was studied in bench-scale suspended growth and fixed film enhanced suspended growth systems at temperatures of 10.5-28.5°C and pH values of 6.0-9.1. Nitrification followed zero-order kinetics in both systems, and ammonia removals in excess of 99% were observed. The temperature dependency of the suspended growth nitrification rate ...
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Preliminary evaluation of biosolids characteristics for anaerobic membrane reactors treating municipal wastewaters
This study assessed the characteristics of biosolids of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating municipal wastewater. The production of total solids (TS) and volatile solids (VS) was comparable to that reported for the extended aeration system at solids residence time (SRT) longer than 40 days. The yields of TS and VS were reduced as SRT increased from 40 to 100 days and ...
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Wastewater as a resource: a unique approach to achieving energy sustainability
A wastewater-treatment flowsheet was developed to integrate uniquely designed biological processes with physical-chemical unit processes, allowing conversion of the organic carbon in the wastewater to methane, the removal and recovery of phosphorus and nitrogen from the wastewater, and the production of water suitable for reuse. In the flowsheet, energy is derived from the wastewater by first ...
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Reductions in greenhouse gas (GHG) generation and energy consumption in wastewater treatment plants
Greenhouse gas (GHG) emission and energy consumption by on-site and off-site sources were estimated in two different wastewater treatment plants that used physical–chemical or biological processes for the removal of contaminants, and an anaerobic digester for sludge treatment. Physical–chemical treatment processes were used in the treatment plant of a locomotive repair factory ...
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Biological Nutrient Removal Model No. 2 (BNRM2): a general model for wastewater treatment plants
This paper presents the plant-wide model Biological Nutrient Removal Model No. 2 (BNRM2). Since nitrite was not considered in the BNRM1, and this previous model also failed to accurately simulate the anaerobic digestion because precipitation processes were not considered, an extension of BNRM1 has been developed. This extension comprises all the components and processes required to simulate ...
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Anaerobic digestion as integrated part of a mechanical-biological Waste treatment process
Anaerobic digestion as a means of stabilising residual municipal solid waste (RMSW) before landfilling was evaluated to study the stabilization of RMSW through mechanical-biological processes and evaluate the effect on landfills. The tests were at the site of WGV Recycling GmbH in Quarzbichl between September 1995 and March 1996. The trials, which were run with a single-phase anaerobic digester, ...
By ORBIT e.V.
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