FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2990831956> ?p ?o ?g. }

• W2990831956 abstract "The anaerobic digestion process is of world wide significance for the treatment of highly concentrated wastes such as industrial and rural effluents, and sewage sludge. As its by product, a renewable fuel (CH4) is produced. However, this process is known to be relatively unstable. Especially when loaded with high concentrations of organic material, volatile fatty acids (VFA) are produced rather than methane (CH4) gas resulting in severe ecological, hygienic, and economic problems. This study was aimed to 1) investigate digester behavior under high loading rates; 2) test the usefulness of the stoichiometric conversion efficiency as a digester control parameter and 3) develop a simple yet efficient control technique that could allow the safe operation of anaerobic digesters at high loading rates. A 1-liter laboratory anaerobic digester was continuously fed with a synthetic wastewater containing glucose as the main substrate. Step changes in the loading rate were applied over a time interval between 12-24 hrs and the volume of the methane produced was monitored on line by an IBM-PC computer. It was observed that, in general, the gas production rate was proportional to the feedrate (loading rate). However, at very high loading rates, the CH4 production rate did not reflect the increase in the feeding rate. Consequently, the VFA accumulated and the H2 partial pressure increased from less than 60 ppm to more than 80 ppm. Two types of overloading were observed: 1) hydraulic overloading which resulted in propionic and acetic acid accumulation and 2) organic overloading which resulted in acetic acid accumulation only. The proportionality between the loading rate and the gas production rate is stoichiometrically expressed as conversion efficiency. The conversion efficiency was used to control the digester by pre-determined step changes in the loading rate. Using a cut-off conversion efficiency of 75 %, the digester was fed according to its current gas production potential, and constantly pushed to production limit. This control strategy maintained the digester stable and close to its maximum sustainable loading rate. A maximum CH4 production rate of 0.8 L CH4 /L d was observed at a loading rate of 14.5 mmoles glucose/L day and hydraulic retention time of 10 days. However, the conversion efficiency is a useful control parameter only if the feed composition is known. The relative measure of the ratio of gas production rate to the loading rate was investigated for its potential to be used for digester control in cases where the feed composition is not known. An increase in the loading rate was initiated and the response of the gas production rate to that increase was monitored. As long as the digester operated efficiently, the ratio of the % increase in the CH4 production rate over the % increase in the loading rate (designated as R-factor) was close to 1. By keeping the value of this ratio greater than 0.5, the loading strategy based on the R-factor, was found useful in the control and optimisation of the performance of the digester. The results indicated that anaerobic digesters could be allowed to operate close to its maximum sustainable loading rate and increase its productivity by using the conversion efficiency and the R-factor as control parameters." @default.
• W2990831956 created "2019-12-05" @default.
• W2990831956 creator A5079507707 @default.
• W2990831956 date "1995-01-01" @default.
• W2990831956 modified "2023-09-23" @default.
• W2990831956 title "Development of a control technique for the automated safe operation of anaerobic digesters at high loading rates" @default.
• W2990831956 hasPublicationYear "1995" @default.
• W2990831956 type Work @default.
• W2990831956 sameAs 2990831956 @default.
• W2990831956 citedByCount "0" @default.
• W2990831956 crossrefType "dissertation" @default.
• W2990831956 hasAuthorship W2990831956A5079507707 @default.
• W2990831956 hasConcept C121332964 @default.
• W2990831956 hasConcept C127413603 @default.
• W2990831956 hasConcept C147455438 @default.
• W2990831956 hasConcept C178790620 @default.
• W2990831956 hasConcept C185592680 @default.
• W2990831956 hasConcept C20556612 @default.
• W2990831956 hasConcept C2776673659 @default.
• W2990831956 hasConcept C39432304 @default.
• W2990831956 hasConcept C42407357 @default.
• W2990831956 hasConcept C499616599 @default.
• W2990831956 hasConcept C5140985 @default.
• W2990831956 hasConcept C516920438 @default.
• W2990831956 hasConcept C528095902 @default.
• W2990831956 hasConcept C548081761 @default.
• W2990831956 hasConcept C55493867 @default.
• W2990831956 hasConcept C62520636 @default.
• W2990831956 hasConcept C75212476 @default.
• W2990831956 hasConcept C86803240 @default.
• W2990831956 hasConcept C87717796 @default.
• W2990831956 hasConcept C94061648 @default.
• W2990831956 hasConceptScore W2990831956C121332964 @default.
• W2990831956 hasConceptScore W2990831956C127413603 @default.
• W2990831956 hasConceptScore W2990831956C147455438 @default.
• W2990831956 hasConceptScore W2990831956C178790620 @default.
• W2990831956 hasConceptScore W2990831956C185592680 @default.
• W2990831956 hasConceptScore W2990831956C20556612 @default.
• W2990831956 hasConceptScore W2990831956C2776673659 @default.
• W2990831956 hasConceptScore W2990831956C39432304 @default.
• W2990831956 hasConceptScore W2990831956C42407357 @default.
• W2990831956 hasConceptScore W2990831956C499616599 @default.
• W2990831956 hasConceptScore W2990831956C5140985 @default.
• W2990831956 hasConceptScore W2990831956C516920438 @default.
• W2990831956 hasConceptScore W2990831956C528095902 @default.
• W2990831956 hasConceptScore W2990831956C548081761 @default.
• W2990831956 hasConceptScore W2990831956C55493867 @default.
• W2990831956 hasConceptScore W2990831956C62520636 @default.
• W2990831956 hasConceptScore W2990831956C75212476 @default.
• W2990831956 hasConceptScore W2990831956C86803240 @default.
• W2990831956 hasConceptScore W2990831956C87717796 @default.
• W2990831956 hasConceptScore W2990831956C94061648 @default.
• W2990831956 hasLocation W29908319561 @default.
• W2990831956 hasOpenAccess W2990831956 @default.
• W2990831956 hasPrimaryLocation W29908319561 @default.
• W2990831956 hasRelatedWork W140885661 @default.
• W2990831956 hasRelatedWork W1562580207 @default.
• W2990831956 hasRelatedWork W1981053421 @default.
• W2990831956 hasRelatedWork W2035958579 @default.
• W2990831956 hasRelatedWork W2056042153 @default.
• W2990831956 hasRelatedWork W2061716825 @default.
• W2990831956 hasRelatedWork W2062587539 @default.
• W2990831956 hasRelatedWork W2095235422 @default.
• W2990831956 hasRelatedWork W2134804408 @default.
• W2990831956 hasRelatedWork W2163751039 @default.
• W2990831956 hasRelatedWork W2173704257 @default.
• W2990831956 hasRelatedWork W2388003863 @default.
• W2990831956 hasRelatedWork W2734058557 @default.
• W2990831956 hasRelatedWork W2802012169 @default.
• W2990831956 hasRelatedWork W2915202097 @default.
• W2990831956 hasRelatedWork W2993764949 @default.
• W2990831956 hasRelatedWork W3150318467 @default.
• W2990831956 hasRelatedWork W3193763360 @default.
• W2990831956 hasRelatedWork W3195752470 @default.
• W2990831956 hasRelatedWork W436896455 @default.
• W2990831956 isParatext "false" @default.
• W2990831956 isRetracted "false" @default.
• W2990831956 magId "2990831956" @default.
• W2990831956 workType "dissertation" @default.