نتایج جستجو برای: high turbidity

تعداد نتایج: 2063698  

2017
Åsa N. Austin Joakim P. Hansen Serena Donadi Johan S. Eklöf

Field surveys often show that high water turbidity limits cover of aquatic vegetation, while many small-scale experiments show that vegetation can reduce turbidity by decreasing water flow, stabilizing sediments, and competing with phytoplankton for nutrients. Here we bridged these two views by exploring the direction and strength of causal relationships between aquatic vegetation and turbidity...

2004
S. Katayon M. J. Megat Mohd Noor M. Asma A. M. Thamer A. G. Liew Abdullah A. Idris A. M. Suleyman M. B. Aminuddin B. C. Khor

This study presents the effects of storage duration and temperature of Moringa oleifera stock solution on its coagulation efficiency. Moringa oleifera stock solutions, which were kept at room temperature (28°C), were able to remove turbidity from medium, high and very high turbidity water samples and no coagulation activity was observed for low turbidity water and surface water tested. The high...

Journal: :applied biotechnology reports 0
ali daryabeigi zand university of tehran hassan hoveidi

colloids are small suspended particles in water which can not be settled or removed naturally due to their light weight and stability. these particles pose some degree of stability and cause water turbidity. there are some concerns regarding colloid removal efficiency in water treatment plants of iran. in this study, the effectiveness of aluminium sulfate and poly-aluminum chloride was evaluate...

Journal: :Progress in Earth and Planetary Science 2017

Journal: :Environmental monitoring and assessment 2010
Christian F Lenhart Kenneth N Brooks Daniel Heneley Joseph A Magner

The Minnesota River Basin (MRB), situated in the prairie pothole region of the Upper Midwest, contributes excessive sediment and nutrient loads to the Upper Mississippi River. Over 330 stream channels in the MRB are listed as impaired by the Minnesota Pollution Control Agency, with turbidity levels exceeding water quality standards in much of the basin. Addressing turbidity impairment requires ...

2002
G. Shanmugam

During the past 50 years, the turbidite paradigm has promoted many myths related to deep-water turbidite deposition. John E. Sanders (1926–1999), a pioneering process sedimentologist, first uncovered many of these turbidite myths. This paper provides a reality check by undoing 10 of these turbidite myths. Myth No. 1: turbidity currents are non-turbulent flows with multiple sediment-support mech...

2016
Matthias Hasenbein Nann A. Fangue Juergen Geist Lisa M. Komoroske Jennifer Truong Rina McPherson Richard E. Connon

Turbidity can influence trophic levels by altering species composition and can potentially affect fish feeding strategies and predator-prey interactions. The estuarine turbidity maximum, described as an area of increased suspended particles, phytoplankton and zooplankton, generally represents a zone with higher turbidity and enhanced food sources important for successful feeding and growth in m...

2006
Hui-Peng Lin Guy Charmantier Pierre Thuet Jean-Paul Trilles

Penaeus japonicus juveniles were exposed for 3 wk to different turbidities of suspended sediments: control [2 + 2 nephelometric turbidity units (NTU)], medium turbidity (35 f 15 NTU) and high turbidity (65 f 15 NTU). The mortality rate increased after exposure to high turbidity Exposed late luveniles became less tolerant to changes in ambient salinity and showed hlgher mortalities at low salini...

2010
Akbar Baghvand Abdolreza Karbassi

Problem statement: Turbid waters, containing colloidal particles, are normally treated by coagulation-flocculation followed by clarification. Ferric chloride and alum, which are the most common types of coagulants in water treatment plants of Iran as well as many other countries, were investigated with the aim of determining their capabilities to reduce turbidity of drinking water. Turbidity wa...

Journal: :Journal of fish biology 2010
C G Wellington C M Mayer J M Bossenbroek N A Stroh

Laboratory experiments were conducted to determine how larval and juvenile yellow perch Perca flavescens respond to changes in prey density when exposed to different levels and types of turbidity (phytoplanktonic or sedimentary). Across prey densities, consumption by P. flavescens tended to be less in phytoplanktonic turbidity compared with sedimentary turbidity. For larvae, this effect was dep...

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