81 research outputs found
Dissolved gas separation for engineered anaerobic wastewater systems
Dissolved gases produced within engineered anaerobic processes subsequently create a fugitive emission which can have financial, environmental and health and safety implications. Whilst desorption technology has been used to control dissolved gases in the drinking water sector, there is considerably less understanding of its deployment in wastewater for which there are numerous existing and emerging challenges. This review therefore focuses on existing and proposed technological approaches to gas desorption in engineered anaerobic wastewater processes, with specific emphasis on technology compatibility and downstream gas phase management. Simplified engineered solutions such as diffused aeration and multi-tray aerators appear robust solutions for implementation into wastewater. However, these processes are characterised by a low mass transfer coefficient and require high gas to liquid ratios (G/L) to achieve reasonable separation, which suggests their suitability is limited to small scale applications, in which gas recovery is not a priority. Packed columns and membrane contactors afford process intensification through increasing interfacial area which favours large scale applications; although both will require prefiltration technology to obviate media clogging. Vacuum or steam is the preferred driving force for separation when gas recovery is sought, while sweep-gas is energetically favoured. Sweep-gas has been used for gas recovery by operating at G/L toward the equilibrium value, which somewhat constrains mass transfer. Process selection must therefore be weighted on whole life cost, but will also be dependent upon process scale, financial (e.g. incentivisation) and non-financial (e.g. carbon) instruments, which are strongly influenced by regional policy
Uso de lagoa aerada facultativa como polimento do reator anaeróbio de manta de lodo UASB no tratamento de dejetos de suínos em escala laboratorial
Determinação do tempo necessário para oxidação da matéria orgânica facilmente biodegradável em reator seqüencial em batelada (RSB) com enchimento estático
Patterns of knowledge used by nurses in caring for the patient in the first psychotic outbreak
Determination of kinetic parameters of an upflow anaerobic sludge blanket reactor (uasb), treating swine wastewater
Proposta de um método racional para o dimensionamento de reatores de tratamento de esgotos por lodos ativados em bateladas para remoção de carga orgânica
Monitoramento de parâmetros físicos, químicos e biológicos em um reator anaeróbio híbrido (RAH) em escala piloto, tratando água residuária do café produzido por via úmida
Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee
Efeito do tratamento térmico de lodo anaeróbio sobre as características de biodegradabilidade da fração orgânica
Remoção de compostos nitrogenados e fosfatados de efluentes por meio de reator anaeróbico com fluxo ascendente
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