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The Water Environment Research Foundation sponsored a project to investigate the affect of various wastewater characteristics on primary clarifier performance and to quantify the variability of these characteristics. Eight public ...
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The Water Environment Research Foundation sponsored a project to investigate the affect of various wastewater characteristics on primary clarifier performance and to quantify the variability of these characteristics. Eight public agencies participated in the study by collecting performance data around a designated test primary clarifier. Three of the agencies studied two test clarifiers.
The data presented and analyzed here were collected at the Edmonds, Washington, Wastewater Treatment Plant. The paper describes a new paradigm for evaluating primary clarifier performance, which is confirmed using the Edmonds data.
Edmonds tested two clarifier configurations: (1) a square tank with a circular sludge collection mechanism (a so called “squircle” configuration) and (2) a rectangular tank with two circular sludge collection mechanisms. The data collected are inconclusive in regards to which configuration performed better.
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摘要 :
The Water Environment Research Foundation sponsored a project to investigate the affect of various wastewater characteristics on primary clarifier performance and to quantify the variability of these characteristics. Eight public ...
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The Water Environment Research Foundation sponsored a project to investigate the affect of various wastewater characteristics on primary clarifier performance and to quantify the variability of these characteristics. Eight public agencies participated in the study by collecting performance data around a designated test primary clarifier. Three of the agencies studied two test clarifiers.
The data presented and analyzed here were collected at the Edmonds, Washington, Wastewater Treatment Plant. The paper describes a new paradigm for evaluating primary clarifier performance, which is confirmed using the Edmonds data.
Edmonds tested two clarifier configurations: (1) a square tank with a circular sludge collection mechanism (a so called “squircle” configuration) and (2) a rectangular tank with two circular sludge collection mechanisms. The data collected are inconclusive in regards to which configuration performed better.
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Operators of a 40 MGD (6,300 m~3/hr) wastewater treatment plant serving a western USA paper mill were periodically chlorinating return activated sludge (RAS) streams to mitigate a recurring filamentous bacteria bulking problem. In...
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Operators of a 40 MGD (6,300 m~3/hr) wastewater treatment plant serving a western USA paper mill were periodically chlorinating return activated sludge (RAS) streams to mitigate a recurring filamentous bacteria bulking problem. In mid-2019, chlorination requirements to prevent filament-bulking-induced throughput limitations became more frequent. Average floc size and quality gradually deteriorated. Finally, chlorination of RAS could not be employed as frequently as needed to reduce filamentous growth without causing loss of solids due to deterioration of desired floc. Wastewater treatment plant (WWTP) throughput reductions were required which in turn required some temporary paper production curtailment. An operational innovation using existing assets was employed to select against filaments, allowing for resumption of full capacity wastewater treatment.
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The Upper Occoquan Service Authority (UOSA) identified the need for increased secondary treatment capacity at the Millard H. Robbins, Jr. Regional Water Reclamation Plant (RWRP) to meet future raw sewage flows and loads. UOSA is u...
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The Upper Occoquan Service Authority (UOSA) identified the need for increased secondary treatment capacity at the Millard H. Robbins, Jr. Regional Water Reclamation Plant (RWRP) to meet future raw sewage flows and loads. UOSA is undertaking a pilot study at the RWRP to compare full-scale performance with and without waste activated sludge (WAS) hydrocyclones, to identify if selectively retaining dense, fast-settling material using WAS hydrocyclones will have a substantive effect on sludge settleability, thereby demonstrating that higher flows and loads can be treated with existing secondary treatment infrastructure. Results from the first ten months of pilot operation indicate that the hydrocyclones have a positive impact in improving mixed liquor settleability during winter operation, as evidenced by sludge volume index (SVI) measurements and clarifier flux analyses.
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摘要 :
The Upper Occoquan Service Authority (UOSA) identified the need for increased secondary treatment capacity at the Millard H. Robbins, Jr. Regional Water Reclamation Plant (RWRP) to meet future raw sewage flows and loads. UOSA is u...
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The Upper Occoquan Service Authority (UOSA) identified the need for increased secondary treatment capacity at the Millard H. Robbins, Jr. Regional Water Reclamation Plant (RWRP) to meet future raw sewage flows and loads. UOSA is undertaking a pilot study at the RWRP to compare full-scale performance with and without waste activated sludge (WAS) hydrocyclones, to identify if selectively retaining dense, fast-settling material using WAS hydrocyclones will have a substantive effect on sludge settleability, thereby demonstrating that higher flows and loads can be treated with existing secondary treatment infrastructure. Results from the first ten months of pilot operation indicate that the hydrocyclones have a positive impact in improving mixed liquor settleability during winter operation, as evidenced by sludge volume index (SVI) measurements and clarifier flux analyses.
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To explore the factors affecting sludge settlement, cultivation of aerobic activated sludge in a 20L sequencing batch reactors (SBR), using sludge in the aeration pool of the sewage plant as seed sludge, keep in room temperature (...
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To explore the factors affecting sludge settlement, cultivation of aerobic activated sludge in a 20L sequencing batch reactors (SBR), using sludge in the aeration pool of the sewage plant as seed sludge, keep in room temperature (20℃～22℃), artificial synthetic wastewater. By changing the SRT, DO, running cycles and lighting condition, monitoring sludge settlement ratio (SV), mixed liquor suspended solids (MLSS) and the sludge volume index (SVI). The novel results we found were that without light, the sludge were prone to inflation easily. Meanwhile, filamentous bacteria could be easily inflated under low DO; running cycles have an effect on sludge settle ability, three cycles a day had much lower SVI value than once a day. When the DO stay from 2mg/L to 6mg/L, one cycle a day, the sludge performance can keep stable, ammonium-nitrogen removal rate can reach more than 70%.
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This paper summarizes ongoing research leading to the development of an Upset Early Warning
Device (UEWD) designed to predict activated sludge deflocculation or biofilm detachment
caused by electrophilic chemicals into wastewate...
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This paper summarizes ongoing research leading to the development of an Upset Early Warning
Device (UEWD) designed to predict activated sludge deflocculation or biofilm detachment
caused by electrophilic chemicals into wastewaters. This biosensor concept is based on a
previously demonstrated response which shows that potassium is effluxed within seconds from
electrophile-stressed bacterial cells, and that this potassium efflux correlates with activated
sludge deflocculation and biofilm detachment. The UEWD is a microfluidic device constructed
of a polyethylene terephthalate glycol substratum and polyester lid, and incorporates in-channel
posts to enhance bacterial immobilization in the channels. Escherichia coli K-12 is immobilized
into the channel, and changes in potassium levels in the wastewater flowing through the channel
are detected using an ionophore/chromoionophore coupled optode. Preliminary results from an
early prototype of the device are presented.
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摘要 :
This paper summarizes ongoing research leading to the development of an Upset Early Warning Device (UEWD) designed to predict activated sludge deflocculation or biofilm detachment caused by electrophilic chemicals into wastewaters...
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This paper summarizes ongoing research leading to the development of an Upset Early Warning Device (UEWD) designed to predict activated sludge deflocculation or biofilm detachment caused by electrophilic chemicals into wastewaters. This biosensor concept is based on a previously demonstrated response which shows that potassium is effluxed within seconds from electrophile-stressed bacterial cells, and that this potassium efflux correlates with activated sludge deflocculation and biofilm detachment. The UEWD is a microfluidic device constructed of a polyethylene terephthalate glycol substratum and polyester lid, and incorporates in-channel posts to enhance bacterial immobilization in the channels. Escherichia coli K-12 is immobilized into the channel, and changes in potassium levels in the wastewater flowing through the channel are detected using an ionophore/chromoionophore coupled optode. Preliminary results from an early prototype of the device are presented.
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Achieving and maintaining good biomass settling characteristics is a critical process design objective for any activated sludge wastewater treatment plant (WWTP), whether intermittent or continuous technology. One way of ensuring ...
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Achieving and maintaining good biomass settling characteristics is a critical process design objective for any activated sludge wastewater treatment plant (WWTP), whether intermittent or continuous technology. One way of ensuring good sludge settleability in intermittent WWTPs is the incorporation of bioselectors in the process. A bioselector is essentially a small discrete reactor volume designed primarily for carbon absorption, in which activated sludge organisms are exposed to a high substrate concentration for a relatively short time. It is normally very much smaller than an anoxic zone and the activated sludge recycle is only a fraction of that typically adopted in continuous plants. With proper conditioning, recycled biomass rapidly absorbs and stores soluble organic wastewater components before transfer to the main treatment basin. This absorption and storage mechanism, and careful management of aeration throughout the intermittent treatment cycle, plays a crucial role in many subsequent growth and treatment processes, including sludge floc formation, denitrification and biological phosphorus removal. This paper examines some design considerations, and reviews the benefits of bioselectors by reference to the commissioning and initial operation of the new 160ML/d Woodman Point Sequencing Batch Reactor in Perth, Western Australia. The applicability of bioselectors in continuous plants is discussed.
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Achieving and maintaining good biomass settling characteristics is a critical process design objective for any activated sludge wastewater treatment plant (WWTP), whether intermittent or continuous technology. One way of ensuring ...
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Achieving and maintaining good biomass settling characteristics is a critical process design objective for any activated sludge wastewater treatment plant (WWTP), whether intermittent or continuous technology. One way of ensuring good sludge settleability in intermittent WWTPs is the incorporation of bioselectors in the process. A bioselector is essentially a small discrete reactor volume designed primarily for carbon absorption, in which activated sludge organisms are exposed to a high substrate concentration for a relatively short time. It is normally very much smaller than an anoxic zone and the activated sludge recycle is only a fraction of that typically adopted in continuous plants. With proper conditioning, recycled biomass rapidly absorbs and stores soluble organic wastewater components before transfer to the main treatment basin. This absorption and storage mechanism, and careful management of aeration throughout the intermittent treatment cycle, plays a crucial role in many subsequent growth and treatment processes, including sludge floc formation, denitrification and biological phosphorus removal. This paper examines some design considerations, and reviews the benefits of bioselectors by reference to the commissioning and initial operation of the new 160ML/d Woodman Point Sequencing Batch Reactor in Perth, Western Australia. The applicability of bioselectors in continuous plants is discussed.
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