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: Two-phase anaerobic digestion tests were conducted at DuPage County, Illinois, to ascertain if this process configuration would alleviate severe foaming and overloading conditions experienced by the existing high-rate digestion system.
Abstract: Two-phase anaerobic digestion tests were conducted at DuPage County, Ill., to ascertain if this process configuration would alleviate severe foaming and overloading conditions experienced by the existing high-rate digestion system. Pilot-scale two-phase digestion of activated sludge exhibited aggregated carbohydrate-protein-lipid and volatile solids (VS) reductions of more than 70%, and gas yield and gas production rate of 0.29 m 3 /kg VS.d and 2.2 volume per culture volume per day, respectively, at an hydraulic retention time 12 days and a loading rate of 4.7 kg VS/m 3 .d without any evidence of digester foaming; this performance was considerably better than that of high-rate digestion. Acid- and methane-phase digester culture development was completed in approximately a month. The acid-digester gases contained 67% CO 2 , 30% CH 4 , 2% nitrogen, 1% H 2 S compared with 30% CO 2 , 69% CH 4 , 0% N 2 , and 0.1% H 2 S in the methane-digester gases. The methane digester generated 90 volume percent to 95 volume percent of the system methane production. An enrichment culture of fermentative acidogens was established in the acid-phase digester, whereas the methane digester harbored a dominant population of methanogenic organisms. The, existing high-rate digestion system was converted to a two-phase digestion process
101 citations
TL;DR: In this article, the performance of a two-stage, two-phase, unmixed anaerobic digester of 155 l working volume operating on acid cheese whey and dairy manure at various temperatures and hydraulic retention times was investigated.
101 citations
TL;DR: It is suggested that algae-induced phosphate precipitation by algae is key to P removal and high-density algae cultivation produces P-rich algal biomass with excellent settling properties.
101 citations
TL;DR: In this paper, it was observed that in experimental work under laboratory scale using conventional biochemical methane potential (BMP) assay, the loading rate ratio 4:1 had optimum biodegradability rate than other ratios which were investigated.
Abstract: In this study, it was observed that in experimental work under laboratory scale using conventional biochemical methane potential (BMP) assay, the loading rate ratio 4:1 had optimum biodegradability rate than other ratios which were investigated, while the loading rate ratio of 1:1 had optimum biogas and methane yield after 15 days hydraulic retention time It was concluded that chicken waste (CM) mono-digestion has higher biodegradability rate compare to organic fraction municipality solid waste (OFMSW) mono-digestion Co-digestion of OFMSW and CM stabilizes conditions in digestion process such as carbon to nitrogen (C:N) ratio in the substrate mixtures as well as macro and micronutrients, pH, inhibitors or toxic compounds, dry matter and thus increasing biogas production It was concluded that the organic waste generated in the municipal landfills could be co-digested with CM to produce methane which can be used as a source of environmentally friendly and clean energy for the transport sector, industries and residential homes
100 citations
TL;DR: Although actual cokes wastewater contained high concentrations of various toxic pollutants, the pre-denitrification process showed stable and successful performances in both nitrification and denitrification reactions.
100 citations