Stormwater and lamella settlers: Efficiency and reality

Daligault, A.; Meaudre, D.; Arnault, D.; Duc, Vu Minh; Bardin, N.; Aires, N.; Biau, D.; Schmid, Josef; Clement, Prabhakar; Viau, Jean Yves

doi:10.1016/s0273-1223(99)00012-8

Cited by 8 publications

(2 citation statements)

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“…The quality of surface water can also be improved by installing pre-treatment devices at the stormwater sewerage outlets (e.g. settling tanks and separators) (Daligault et al 1999 ; Tran and Kang 2013 ). Wherever possible, the surface must be unsealed in order to increase the infiltration of rainwater and enhance the resources of underground water (combating the depression cone).…”

Section: Resultsmentioning

confidence: 99%

Effect of transport infrastructure development on selected components of the environment of inner-city river valley and the possibility of its revitalization (Lublin, Poland)

Zubala

2022

Environ Sci Pollut Res

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The study covered an urban river valley, strongly transformed due to the transport infrastructure development. The paper evaluates changes in spatial management of the valley section passing through the city centre that occurred during the past two centuries (long-term and short-term phenomena) as well as their effect on selected environmental components. The basic spatial analyses were carried out with the use of specialized software, cartographic materials and photographic and descriptive documentation of the studied area (archival data). The most unfavourable changes in the potential of the valley environment occurred over the past few decades. They are manifested in a considerable deterioration of landscape values as well as the quantity and quality of water resources. Relationship was identified between water quality and intensity of motor vehicle traffic near the river. Despite the progressing urbanisation of the valley, revitalisation procedures can be still carried out and attractive space in the city centre can be created. In order to demonstrate the reasonableness of the presented concept, the paper suggests that urban succession should be incorporated as a term covering time trends and accumulated transformations. It can be helpful in analysing and determining the directions of development in disputable situations.

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Section: Resultsmentioning

confidence: 99%

Effect of transport infrastructure development on selected components of the environment of inner-city river valley and the possibility of its revitalization (Lublin, Poland)

Zubala

2022

Environ Sci Pollut Res

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“…Hypothetically, the inclined coalescence plates serve two purposes, i.e., (1) to promote laminar flow, and (2) to promote optimum oil-water-solid separation efficiency (Daligault et al 1999). By using the principles of (a) a maximum amount of plate surface area provided for oil droplets coalescence and solid particles coagulation to take place, and (b) a minimum distance for lighter oil droplets to rise and hit the bottom side of the inclined plates and heavier solid particles to settle on the upper side of the inclined plates as shown in Figure 2.…”

Section: Applicability Of Inclined Coalescence Platesmentioning

confidence: 99%

Oil droplets and solid particles removal using circular separator with inclined coalescence mediums: comparison between co-current and counter-current flow

Ngu

Law

Wong

et al. 2010

Water Science and Technology

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This research investigated the effects of co- and counter-current flow patterns on oil-water-solid separation efficiencies of a circular separator with inclined coalescence mediums. Oil-water-solid separations were tested at different influent concentrations and flowrates. Removal efficiencies increased as influent flowrate decreased, and their correlationship can be represented by power equations. These equations were used to predict the required flowrate, Q(ss50), for a given influent suspended solids concentration C(iss) to achieve the desired effluent suspended solids concentration, C(ess) of 50 mg/L, to meet environmental discharge requirements. The circular separator with counter-current flow was found to attend removal efficiencies relatively higher as compared to the co-current flow. As compared with co-current flow, counter-current flow Q(ss50) was approximately 1.65 times higher than co-current flow. It also recorded 13.16% higher oil removal at influent oil concentration, C(io) of 100 mg/L, and approximately 5.89% higher TSS removal at all influent flowrates. Counter-current flow's better removal performances were due to its higher coalescing area and constant interval between coalescence plate layers.

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Uncertainties of stormwater characteristics and removal rates of stormwater treatment facilities: Implications for stormwater handling

2012

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Stormwater runoff is a major contributor to the pollution of receiving waters. This study focuses at characterising stormwater in order to be able to determine the impact of stormwater on receiving waters and to be able to select the most appropriate stormwater handling strategy. The stormwater characterisation is based on determining site mean concentrations (SMCs) and their uncertainties as well as the treatability of stormwater by monitoring specific pollutants concentration levels (TSS, COD, BOD, TKN, TP, Pb, Cu, Zn, E.coli) at three full scale stormwater treatment facilities in Arnhem, the Netherlands. This has resulted in 106 storm events being monitored at the lamella settler, 59 at the high rate sand filter and 132 at the soil filter during the 2 year monitoring period. The stormwater characteristics in Arnhem in terms of SMCs for main pollutants TSS and COD and settling velocities differ from international data. This implies that decisions for stormwater handling made on international literature data will very likely be wrong due to assuming too high concentrations of pollutants and misjudgement of the treatability of stormwater. The removal rates monitored at the full scale treatment facilities are within the expected range, with the soil filter and the sand filter having higher removal rates than the lamella settler. The full scale pilots revealed the importance of incorporating gross solids removal in the design of stormwater treatment facilities, as the gross solids determine operation and maintenance requirements.

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Stormwater and lamella settlers: Efficiency and reality

Cited by 8 publications

References 0 publications

Effect of transport infrastructure development on selected components of the environment of inner-city river valley and the possibility of its revitalization (Lublin, Poland)

Effect of transport infrastructure development on selected components of the environment of inner-city river valley and the possibility of its revitalization (Lublin, Poland)

Oil droplets and solid particles removal using circular separator with inclined coalescence mediums: comparison between co-current and counter-current flow

Uncertainties of stormwater characteristics and removal rates of stormwater treatment facilities: Implications for stormwater handling

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