232 Articles found
IWA Publishing Articles
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Modelling of anaerobic digester biogas production: case study of a pilot project in Morocco
An anaerobic digestion pilot system was implemented in June 2010 in the Moroccan village of Dayet Ifrah. The input material consists of toilet wastewater and cattle manure. Biogas is produced under anaerobic conditions. It is used for heating and ...
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The effects of electrode spacing on the performance of microbial fuel cells under different substrate concentrations
In this study, the electricity generation and organic removal in microbial fuel cells (MFCs) were examined for electrode spacing (ES) covering 5.8, 10.2, 15.1, and 19.5 cm, and for each ES the MFCs were discharged with a series of influent ...
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Usages of free-flow hydraulic turbines and boosting their energy efficiency
The article analyses engineering solutions of free-flow hydraulic turbines and ways of making them more energy efficient through application of the hydrodynamic effect of boosting the flow power. Keywords: energy; energy efficiency; capacity; ...
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Risk sharing in hydropower development: case study of the Chukha Hydel Project in Bhutan
The Himalayan rivers have an enormous hydropower potential that is still not exploited fully for the benefit of the region. Bhutan and Nepal together have an economically feasible potential of 60,000 MW of hydroelectric power generation capacity ...
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Role of primary sedimentation on plant-wide energy recovery and carbon footprint
The goal of this paper is to show the effect of primary sedimentation on the chemical oxygen demand (COD) and solids fractionation and consequently on the carbonaceous and energy footprints of wastewater treatment processes. Using a simple ...
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Effect of pH and distance between electrodes on the performance of a sediment microbial fuel cell
The performance of three sediment microbial fuel cells (SMFCs) was evaluated at different feed water pH and electrode spacing for chemical oxygen demand (COD) removal, total nitrogen (TN) removal, and power density; while offering in situ ...
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A comparative study of three different assimilable organic carbon (AOC) methods: results of a round-robin test
Easily assimilable organic carbon (AOC) is frequently used for the assessment of the biological stability of drinking water, which is an important consideration in the control of bacterial growth in distribution networks. The first AOC bioassay ...
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Limited adaptive genetic algorithm for inner-plant economical operation of hydropower station
A limited adaptive genetic algorithm (LAGA) is proposed in the paper for inner-plant economical operation of a hydropower station. In the LAGA, limited solution strategy, with the feasible solution generation method for generating an initial ...
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Performance of denitrifying microbial fuel cell subjected to variation in pH, COD concentration and external resistance
The effects of pH, chemical oxygen demand (COD) concentration and external resistance on denitrifying microbial fuel cell were evaluated in terms of electricity generation characteristics and pollutant removal performance. The results showed that ...
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Experimental study on calcium carbonate precipitation using electromagnetic field treatment
The present study investigated the effectiveness of electromagnetic fields in preventing calcium carbonate (CaCO3) fouling in cooling water. Four different frequencies and two different voltages were adopted to induce electromagnetic fields ...
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Concurrent photocatalytic hydrogen production and organic degradation by a composite catalyst film in a two-chamber photo-reactor
A novel visible light-driven photocatalyst film, MoS2/Ag/TiO2, was synthesized on a glass-fiber membrane. The composite catalyst film had a multi-layer structure with Ag as nanoconjunctions between the MoS2 and TiO2 layers. The catalyst film ...
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Factsheet: Hydropower and ecology
Accounting for 20% (around 3,400 TWh) of global electricity production – even though its contribution to gross final energy consumption is only about 2% – hydropower plays a vital role. This is largely due to the fact that it can be ...
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Shale gas - Information on hydraulic fracturing (`fracking`)
Shale gas is natural gas – mainly methane – trapped within the micropores of shale formations or adsorbed onto the shale (sedimentary rock). In Europe, known deposits exist in the UK, France, the Netherlands, Germany, Poland, the Baltic ...
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Factors affecting microbial fuel cell acclimation and operation in temperate climates
For the successful scale-up of microbial fuel cell (MFC) systems, enrichment strategies are required that not only maximise reactor performance but also allow anodic biofilms to be robust to environmental change. Cluster analysis of Denaturing ...
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A co-beneficial system using aquatic plants: bioethanol production from free-floating aquatic plants used for water purification
A co-beneficial system using constructed wetlands (CWs) planted with aquatic plants is proposed for bioethanol production and nutrient removal from wastewater. The potential for bioethanol production from aquatic plant biomass was experimentally ...
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The potential impacts of climate change on hydropower generation in Mid Wales
Hydropower is a potential large source of electricity supply in Wales. The Upper River Severn in Mid Wales is a typical stream where a high head hydropower scheme could be developed and the river system at Plynlimon has some of the longest records ...
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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 ...
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Energy benchmarking of South Australian WWTPs
Optimising the energy consumption and energy generation of wastewater treatment plants (WWTPs) is a topic with increasing importance for water utilities in times of rising energy costs and pressures to reduce greenhouse gas (GHG) emissions. ...
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Research into the hydrodynamic effect of boosting power and its full-scale modelling
This article analyses the possibility of full-scale modelling of the hydrodynamic effect that appears in free hydraulic flow as a result of its acceleration and transition through a critical state. Keywords: criteria of hydrodynamic similarity, ...
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A new design of a highly efficient hydraulic turbine on the basis of the specific hydrodynamic effect
Traditional free flow turbines slow down water stream using its kinetic energy. This article describes a method for deriving energy from a free water stream using a unique hydraulic turbine which unlike traditional hydraulic turbines speeds up the ...