نتایج جستجو برای: oxidation ponds

تعداد نتایج: 123246  

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2007
L H Sipaúba-Tavares C S T Guariglia F M S Braga

An investigation was carried out during the rainy period in six semi-intensive production fish ponds in which water flowed from one pond to another without undergoing any treatment. Eight sampling sites were assigned at pond outlets during the rainy period (December-February). Lowest and highest physical and chemical parameters of water occurred in pond P1 (a site near the springs) and in pond ...

Journal: :Water 2022

Passive mine drainage treatment plants are the scene of many chemical and biological reactions. Here, establishment iron (Fe), arsenic (As), manganese (Mn) removal was monitored immediately after commissioning Lopérec (Brittany, France) passive water plant, composed aeration cascades settling ponds followed by pozzolana biofilters. Iron As were almost completely removed commissioning, while Mn ...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2011
R K X Bastos E N Rios P D Bevilacqua R C Andrade

This paper presents the results of five years monitoring of an experimental wastewater treatment plant in southeast Brazil, comprised of a UASB reactor followed by a submerged aerated biofilter (BF) (field scale) and shallow polishing ponds (pilot scale). Three ponds in series achieved high quality effluent standards in terms of ammonia and E.coli, but a fourth pond did not result in further ef...

A. A. Motallebi M. R. Khani, V. Razavilar

The study was undertaken to determine bacterial contamination of warm-water fish ponds and silver carps harvested from those ponds in Guilan province, Iran. In this respect, water samples were taken from 7 ponds and investigated by testing total bacteria, coliforms, and Escherichia coli. In addition, skin swab samples of silver carps caught from each pond were studied for enumeration of the sam...

Journal: :Environmental science & technology 2012
Peter S K Knappett Larry D McKay Alice Layton Daniel E Williams Md J Alam Md R Huq Jacob Mey John E Feighery Patricia J Culligan Brian J Mailloux Jie Zhuang Veronica Escamilla Michael Emch Edmund Perfect Gary S Sayler Kazi M Ahmed Alexander van Geen

Ponds receiving latrine effluents may serve as sources of fecal contamination to shallow aquifers tapped by millions of tube-wells in Bangladesh. To test this hypothesis, transects of monitoring wells radiating away from four ponds were installed in a shallow sandy aquifer underlying a densely populated village and monitored for 14 months. Two of the ponds extended to medium sand. Another pond ...

2017
Matthew J. Ballinger Andrew S. Medeiros Jie Qin Derek J. Taylor

Little is known of the evolution of RNA viruses in aquatic systems. Here, we assess the genetic connectivity of two bunyaviruses (Kigluaik phantom orthophasmavirus or KIGV and Nome phantom orthophasmavirus or NOMV) with zooplanktonic hosts from subarctic ponds. We expected weak genetic structure among populations as the hosts (phantom midges) have a terrestrial winged dispersal stage. To test w...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2008
Michelle D Boone Raymond D Semlitsch Cory Mosby

Managing areas designed for human recreation so that they are compatible with natural amphibian populations can reduce the negative impacts of habitat destruction. We examined the potential for amphibians to complete larval development in golf course ponds in the presence or absence of overwintered bullfrog tadpoles (Rana catesbeiana), which are frequently found in permanent, human-made ponds. ...

2007
Radosław JUSZCZAK Andrzej KĘDZIORA Jacek LEŚNY Janusz OLEJNIK

The article presents the results of analyses of changes in the number of ponds in the Wyskoć catchment basin carried out in the years 1980–2003 and the characteristics of ponds excavated in that period. Only water reservoirs of an area less than 2 ha were considered. Analyses were based on topographic maps in the scale of 1:10 000 and aerial photographs taken in 1996. The results indicated that...

Journal: :Transactions of the Royal Society of Tropical Medicine and Hygiene 2007
Jeroen H J Ensink Muhammad Mukhtar Wim van der Hoek Flemming Konradsen

Waste stabilisation ponds (WSP) are the preferred method for treatment of urban wastewater in low-income countries but, especially in arid regions, the pond systems can be important breeding sites for mosquitoes of medical importance. In a WSP system in Faisalabad, Pakistan, we assessed the impact of simple environmental interventions on mosquito occurrence and abundance. Reducing the amount of...

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