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Showing 1 to 17 of 17 for “"Settling characteristics"”.
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Settling characteristics of particles in a suspension of medium to high solids concentration
… intermediate to high solid concentrations three settling regimes are typically encountered, namely, zone, transition, and compression regimes. Recent studies have indicated that the validity of Kynch's formulation, which is the most widely used for sizing settling basins, is limited to the zone …
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Relationship between the Sludge Settling Characteristics and the Parameters of the Activated Sludge System
… not consider the relationship between the sludge settling characteristics and the aeration unit performance. This project studies the validity of a model developed by La Motta (2004b) which links the operating parameters of an activated sludge system and the classical limiting flux sludge settling …
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Effect of phosphorus limiting conditions on process performance in activated sludge
… and 212:1 produced sludge with extremely poor settling characteristics and data were collected for only one mean cell residence time at each ratio; Data for COD:P ratios of 87:1 and 56:1 were used to estimate kinetic coefficients. These kinetic coefficients were used to develop predicted values …
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The influence of nitrogen and sludge age change in reactor performance and biopolymer production in activated sludge
… and the results were correlated to sludge a settling characteristic and effluent quality. In order to obtain the sludge samples for the analyses, two completely mixed, continuous flow activated sludge systems were maintained during this research. Raw wastewater from the Celanese Fiber Plant …
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Biological excess phosphorus removal in short sludge age activated sludge systems
… and operational parameters, and to check the settling characteristics of the mixed liquor produced in the systems. A secondary objective was to use the observed response data to test the predictive qualities of both the general activated sludge model of Dold, Ekama. and Marais (1985) and the …
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Pretreatment and biodegradation of wastewater from a textile dyeing and finishing industry
… addition of an anionic polymer improved the settling characteristics of the chemical flocs. Color removal ranged from 71-90% and DOC removal averaged 25% with AL220 doses between 400-600 mg/L. Increased sludge ages (θ<sub>c</sub>) of the continuous-flow reactors produced improved removal …
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A methodology for the design of wet detention basins for treatment of highway stormwater runoff
Laboratory-scale settling columns were used to determine the settling velocity distributions of suspended solids to refine a methodology selected by the FHWA in designing wet detention basins for the treatment of highway stormwater runoff. Thirteen runoff samples were collected, over two years, …
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Effect of copper and nickel on the performance of an activated sludge system treating cellulose acetate wastewater
… but not when either was added separately. The settling characteristics of the activated sludge deteriorated when a combination of copper and nickel were added. The SUM increased at a faster rate at higher metal loading rates than at lower metal loading rates to the reactor. The increases in …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
… produces a sludge with poor flocculation and settling characteristics, particularly during the periods of shock organic loadings. Pilot-scale treatment units were set up to study the effects of a fixed film pretreatment on the stability of the AS process, using a new type of trickling filter …
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Improving settleability and achieving biological phosphorus removal through the application of sidestream gravimetric selectors
… a balance of granules and flocs with superior settling characteristics in which phosphorus is removed through phosphorus accumulating organisms (PAO). This project was implemented at a wastewater treatment plant rated at 20 MGD utilizing a 4-stage Bardenpho configuration with an IFAS system. …
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Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation
… is traditionally achieved by means of secondary settling tanks (SSTs), however recently the use of membranes for solid-liquid separation has gained popularity for the following reasons: Membranes are able to retain all solids and thus are insensitive to the settling characteristics of sludges, • …
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Operational parameters of the filamentous microbial process
… the sludges produced by the FAS process have settling characteristics and settleability remarkably similar to the solids of conventional activated sludge. While being tested, the sludges displayed a single clearly defined sludge-supernatant interface, good compaction, and cohesion between …
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
… d solids retention time tests had better sludge settling characteristics with a sludge volume index of 62 mL/g compared to 80 mL/g for the 4 d solids retention time. The EBPR system achieved 90% dissolved reactive phosphorus removal when the system was operated at 4 mg O₂/L, and the ratio of …
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Development of Transitional Settling Regimen Parameters to Characterize and Optimize Solids-liquid Separation Performance
Novel settling characteristic metrics were developed based on the fundamental mechanisms of coagulation, flocculation, and settling. The settling metrics determined parameters that are essential in monitoring and optimizing the activated sludge process without the need for expensive or specialized …
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Secondary Clarifier Modeling: A Multi-Process Approach
The performance of settling tanks depends on several interrelated processes and factors that include: hydrodynamics, settling, turbulence, sludge rheology, flocculation, temperature changes and heat exchange, geometry, loading, the nature of the floc, the atmospheric conditions and the total …
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Development of a new high-rate anaerobic process for the treatment of industrial and domestic wastewaters: the anaerobic migrating blanket reactor (AMBR)
… over the horizontal plane of the reactor and the settling characteristics of the final compartment. To prevent acclimation of biomass in the final compartment, the flow was reversed in a horizontal matter. Keeping the pH sufficiently high in the initial compartment without recycling effluent was …
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Improved Microalgal Biomass Harvesting Using Optimized Environmental Conditions and Bacterial Bioflocculants
… among many other factors. Bioflocculation and settling of suspended microalgae cultures is a harvesting method with potentially low cost and energy input. However, bioflocculation (the spontaneous flocculation of algal cells without chemical addition) has not been a reliable process with …