Self-purification ability of a resurgence stream

Vagnetti, Roberta; Miana, P.; Fabris, Mario; Pavoni, Bruno

doi:10.1016/s0045-6535(03)00445-4

Cited by 65 publications

(33 citation statements)

References 12 publications

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“…Previous studies have suggested that Hongze Lake should function in the drawdown of nutrients, so that nitrogen concentration at the end of the flow path, which includes the lake itself, should be lower [45]. However, there is no significant difference in the nitrogen and phosphorus concentrations between sites G3 and G4.…”

Section: Discussionmentioning

confidence: 93%

Statistical Assessment of Water Quality Issues in Hongze Lake, China, Related to the Operation of a Water Diversion Project

Dai

et al. 2018

Sustainability

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Abstract:The Hongze Lake serves as the first important transfer and storage path along the East Route of the South-to-North Water Diversion Project (SNWDP-ER). After the Project began operating in 2013, eutrophication in the lake has created increasing public concern regarding the direct effect on water quality from the project. In this paper, we used multivariate statistical methods to examine the variances between water quality variables at four site groups (inlets and outlets in the study area) and during three seasons (wet, normal, and dry seasons) in Eastern Hongze Lake. We also used redundancy analysis (RDA) to analyze environmental factors' impact on water quality. We found that (1) the concentrations of nitrogen and phosphorus were exceeding the standard values; (2) No significant spatial heterogeneity regarding nitrogen and phosphorus among the inlet/outlet of Eastern Hongze Lake existed in normal and wet seasons, and there was no evidence demonstrating that SNWDP-ER could improve eutrophication or even contribute to eutrophication in the dry season; (3) Environmental factors (land use, water diversion, and population) have limited influences on water quality, which was possibly caused by the overly-high river input and artificial input of nitrogen and phosphorus. Thus, it is critical to reinforce the control of pollution sources and enhance the ecological restoration.

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Section: Discussionmentioning

confidence: 93%

Statistical Assessment of Water Quality Issues in Hongze Lake, China, Related to the Operation of a Water Diversion Project

Dai

et al. 2018

Sustainability

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“…Mixing the treated wastewater with receiver waters is an important element to self-purification. It involves physical processes (adsorption, sedimentation, volatilization), chemical processes (precipitation, redox reactions) and biological processes (biological mineralization, assimilation), which improve the condition of aquatic ecosystems [Vagnetti et al, 2003, Jarosiewicz, 2007. Self-purification is based on the phenomenon of suspensions and suspended particles sedimentation, adsorption and mineralization of organic compounds.…”

Section: Mixing In the Horizontal Directionmentioning

confidence: 99%

Determination of Mixing Zones for Wastewater With Receiver Waters

Skorbiłowicz¹,

Skorbiłowicz²,

Wójtowicz³

et al. 2017

J. Ecol. Eng.

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INSTRODUCTIONWhen determining the impact of a sewage treatment plant on particular elements of an aqueous environment, it is often improperly assumed that the receiver waters are mixed with purified sewage at the point of discharge or not far from that site. The route of total mixing of pollutants with receiver waters may be several hundred times longer than the width of the riverbed. In fact, the total mixing of wastewater with receiver waters does not always occur at a short distance from the discharge. Determining the distance, at which full mixing should be considered in a given river cross-section in vertical and transverse dimensions [Rutherford, 1994, Miakoto, 2005. Determining the distribution of pollutants within the mixing zone is essential to understand the impact of purified wastewater on aquatic organisms, fish migration, and the health of people using the surface water. Due to this, it is also possible to simulate changes in the quality of river water and to obtain information on the possibility of discharging the purified sewage to surface waters. When forecasting changes in surface water quality, it is very important to learn the concentration distribution within the mixing zone because a large area of excessive concentration of harmful and hazardous components can be found within it. This would result in a reduction in water intake for utility purposes and disturbance of habitats responsible for biodiversity conservation [Adamski, 2000, Ostroumov, 2004, Miakoto, 2005.Mixing of wastewater with receiver waters is possible due to the advection and turbulent and molecular diffusion. The result of these processes is balancing the concentrations of wastewater constituents in the whole volume of water [Ru- Research Article ABSTRACT Discharges from wastewater treatment are among the key sources of pollution, if norms included in the applied legal acts are exceeded. In determining the impact of these objects on water environment it is often assumed that complete mixing wastewater with surface water is in the point or close to the discharge. In fact, the complete mixing of waste water in a short distance from the discharge occurs incidentally depending on the type of sewage receiver. The size and type of specific sewage receiver determines the conditions of self-purification. Complete mixing zone has a huge impact on the intensity of self-purification processes. Therefore, the possibility to determine the size zone of complete mixing of the waste water from the water receiver is important. The issue involves a series of methods, the most computational, which more or less allows to evaluate the distance of mixing waste water. advection, turbulent and molecular diffusion affect mixing wastewater with surface waters. The article discusses the factors influencing the mixing process and the impact of mixing on the self-purification surface waters. The aim of the article is a review of several methods for determining the distance of the segment mix completely discharged wastewater, with regard to the location o...

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“…So, it has to point out that the sampling point at 30-cm depth is eligible for being representative of any depth while water in motion. Therefore, the water quality studies of streamflow in Phetchaburi river will be taken from only the 30-cm depth as shown in Table 3 and Figure 4 which is the international measuring depth (PCD, 2013; APHA, 1952; APHA.AWWA.WEF, 1992; Metcalf and Eddy, 1979;Ntengwe, 2006;Postel and Richter, 2003;Pattamapitoon, 2013;Reynolds and Edwards, 1995;Streeter and Phelps, 1958;Tanji et al, 2006;Vagnetti et al, 2003;Vargaftik et al, 1983;Wang et al, 1987).…”

Section: Variation Of Flow Rate On Measuring Water Depthmentioning

confidence: 99%

“…It is noticed that the concentration of contaminants in stream pollution was varied among seasons and amount of streamflow as well as the diluting-rainwater capability (LERD, 2011;LERD, 2012;Thaipichitburapa et al, 2010;Streeter & Pheiplps, 1958;Reynolds & Edwards, 1995;Berkun, 2005;Robison & Maris, 1985;Faerge et al, 2001). In addition, the stream length was influenced in the excessive contaminants owning to the efficiency of self purification in which the longer the distance is the more the recovery (Ntengwe, 2006;Vagnetti et al, 2003;Cazelles et al, 1991;Tanji et al, 2006;McColl, 1974;Liu & Chen, 2009;Kraus et al, 2014). In the same situation, if the bacterial digesting rate is less than organic wastes (both solid and liquid) releasing rate then the stream pollution may be caused the seriousness, especially the zones of dense populated in the riverine systems (Derx et al, 2014;Pattamapitoon, 2013;Vargaftik et al, 1983;Wang et al, 1978;Tyagi et al, 1999;Penha-Lopes et al, 2011;Srigate, 2009;Streeter & Phelps, 1958).…”

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confidence: 99%

Appropriate Discharge from Diversion Dam to Dilute High Concentrated Community Wastewater of Riverbank Settlements along Phetchaburi River in Phetchaburi Province, Thailand

Mahasinpaisarn¹,

Chunkao²,

Tanchalanukit³

et al. 2015

MAS

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The research was focused on determining dilatability of traveling mass water from Phetchaburi diversion dam on high concentrated community wastewater that flowing into Phetchaburi river. The mass water quality was sampled at six-consecutive measuring stations from Phetchaburi diversion dam to the river mouth with various distances of traveling, and analyzed for 27 environmental indicators before employing ANOVA ANALYSIS which resulted with highly significant differences between indicator and station only BOD, COD, TSS, and turbidity. When the linear regression was employed to determine both the water quality indicators in relation to discharges (10, 15, 20, and 25 cms.) and the traveling distances, resulting the determination coefficients of 0.93 for BOD, 0.80 for COD, 0.83 for TSS, and 0.50 for turbidity. Only BOD value is included in the list of surface water quality standards. After employing the derived equations to calculate BOD in comparison with observed value, then it was chosen to support the decision of required BOD for 3 mg/L at Muang Municipal Bridge together with discharge of 10-15 cms from Phetchaburi diversion dam. If more or less this range in summer period, the dilatability of high contaminant concentration was decreased 2-10 folds due to less mass water flow and washing off organic and solid wastes from flooding along the riverbanks. Furthermore, the traveling mass water from diversion dam is possibly eligible to dilute the high concentrated wastewater from dense and populated community but the diluted mixture depending on the amount and concentration of wastewater inflow.

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Self-purification ability of a resurgence stream

Cited by 65 publications

References 12 publications

Statistical Assessment of Water Quality Issues in Hongze Lake, China, Related to the Operation of a Water Diversion Project

Statistical Assessment of Water Quality Issues in Hongze Lake, China, Related to the Operation of a Water Diversion Project

Determination of Mixing Zones for Wastewater With Receiver Waters

Appropriate Discharge from Diversion Dam to Dilute High Concentrated Community Wastewater of Riverbank Settlements along Phetchaburi River in Phetchaburi Province, Thailand

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