Topic
Hydraulic retention time
About: Hydraulic retention time is a research topic. Over the lifetime, 6406 publications have been published within this topic receiving 151005 citations.
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TL;DR: The aim of this work was to study the treatment of strong beet sugar wastewater by an upflow anaerobic fixed bed (UAFB) at pilot plant scale and provided a very good basis for comparing the effect of packing in reduction efficiency of the system.
54 citations
TL;DR: A well-functioning pilot reactor treating sewage sludge was subjected to a hydraulic overload to investigate whether oxygen benefits successful operation in stressful circumstances and oxygen seemed to form a more stable digestion system, which meant increased ability to deal successfully with overloads.
54 citations
TL;DR: In this paper, the authors evaluated the influence of organic loading rate in bio-hydrogen production from dairy wastewater in an anaerobic fluidized-bed reactor inoculated by natural fermentation of the wastewater used during the operational period.
Abstract: The present study evaluated the influence of organic loading rate in biohydrogen production from dairy wastewater in an anaerobic fluidized-bed reactor inoculated by natural fermentation of the wastewater used during the operational period. The support material for biomass adhesion was shredded tire. The reactor had a working volume of 908.4 cm3. Biohydrogen production was evaluated using three different organic loading rates (OLR) of 28.7 kgCOD m−³d−1, 53.2 kgCOD m−³d−1 e 101,7 kgCOD m−³d−1 corresponding to the Hydraulic Retention Time (HRT) of 8 h (2.7 L d−1), 6 h (3.6 L d−1) and 4 h (5.4 L d−1), respectively. The hydrogen yield decreased with increasing organic loading rate (OLR) from 2.56 ± 0.62 mol H2 mol carbohydrate−1 to 0.95 ± 0.28 mol H2 mol carbohydrate−1 as the OLR increased from 28.65 kgCOD m−³d−1 to 95.76 kgCOD m−³d−1. The hydrogen content in the biogas (volume of H2/ volume of biogas) produced and the highest volumetric production were respectively 35.72 ± 9.43% and 0.80 ± 0.21 LH2 h−1 L−1 obtained when the OLR was 53.25 ± 7.81 kgCOD m−³d−1. The main metabolites produced were acetic acid (67.15%-87.42%) and ethanol (6.01%-13.09%). Increasing the applied OLR also caused an increase in bacterial diversity as evidenced by the highest value of the Shannon-Wiener index (2.811) corresponding to the operational phase of the highest OLR (95.76 ± 29.10 kgCOD m−³d−1).
54 citations
TL;DR: In this paper, market waste consisting of rotten vegetables, fruit skins, potatoes, onions, etc. was subjected to anaerobic digestion in a 25 litres capacity laboratory scale biogas plant of floating dome design.
54 citations
TL;DR: In this paper, a chemically enhanced primary sedimentation (CEPS) followed by an upflow anaerobic sludge blanket (UASB) reactor was used for 170 days.
Abstract: Raw domestic wastewater was treated continuously under laboratory conditions for 170 days by a chemically enhanced primary sedimentation (CEPS) followed by an upflow anaerobic sludge blanket (UASB) reactor. The CEPS was carried out with 70 mg FeCl3l−1 from day 1 to 82 and with 24 ml l−1 of the water extract of Moringa oleifera seeds from day 83 to 170. Compared to the natural primary sedimentation (NPS), the CEPS increased the ratio of soluble chemical oxygen demand to volatile suspended solids (CODs/VSS) of the supernatant by a factor 3 and 10 respectively. Although the FeCl3 increased the CODs/VSS ratio, it caused a decrease of the soluble content of the wastewater by a factor 1.4. This resulted in a low influent concentration supplied to the UASB reactor and consequently a low biogas production. However, the reactor achieved 54 % removal of total COD (CODt) at a hydraulic retention time (HRT) of 2 hours and a volumetric loading rate (Bv) of 1.4 g COD l−1 d−1. The Moringa oleifera seeds, besides the inc...
54 citations