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1
Content available remote Possibile recycling of spent filter backwash
100%
Valentukeviciene M.
Archives of Environmental Protection
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2008
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tom Vol. 34, no. 3
223-228
EN
Spent-filter backwash water is usually discharged into sewers or returned to the head of a water treatment plant (WTP) to be re-processed. The purpose of this study was to characterize and compare two different WTP filter backwash water contents that were obtained by using conventional and air scour backwash methods, and influence the recycling of spent-filter backwash water. For this purpose, the spent-filter backwash water was analyzed at two different Lithuanian WTPs i.e. one using a conventional backwash method and another using an air scour backwash method (Eades, 2001). The impact of recycling spent-filter backwash on the treated water's quality was evaluated by comparing the concentration of the total iron content with suspended solids in the filtered water by following legislation rules. Backwash water in this research contained a significant concentration of total iron and a large amount of suspended solids. In this study it was found that, conventional sedimentation by gravity was sufficient for the removal of suspended solids and iron from the backwash water. Further, the presence of analyzed chemical compounds accumulating into the backwash water after sedimentation had no significant impact on the filtration's effectiveness. Therefore, this research shows that air-scour backwash water can be recycled in the same way as conventional backwash water, but a different sedimentation rate needs to be evaluated.
2
Content available remote Applying backwash water in order to enhance removal of iron and ammonia from spent filters with fresh filter media
100%
Valentukeviciene M.
Environment Protection Engineering
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2009
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tom Vol. 35, nr 3
135-144
EN
In this paper, an enhanced catalytic layer formation for the removal of iron and ammonium without a start up stage - via filtration process was investigated. Tests were made to establish the influence of backwash water on the filter efficiency and the dose of this backwash water to make new filters more efficient. Also its influence on the filtration rate and feed water quality in the fresh filter media and the final water quality was shown. The most common quartz sand-filter media (0.7-2.0 mm coarse-sized sand particles) used at Lithuanian water works were tested in a pilot test-bench constructed for this research in the laboratory in the Water Management Department of Vilnius Gediminas Technical University. In the process tested, fresh backwash water added to the filter media was used as the catalyzing layer and proved to be more efficient in the removal of iron and ammonium from the ground water and in the reduction of the filter media at the start up stage than conventional filter start up procedure. When filtration was carried out at a low filtration rate (3-5 m/h) the results were better compared with those obtained at a higher rate in conventional filtration.
3
Quality improvement of potable water in the Baltic Sea coastal area
63%
Valentukeviciene M. , Rimeika M.
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nr 35
99-107
4
Content available Water Reuse Possibilities at Students Dormitories
63%
Valentukeviciene M. , Rynkun G.
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tom Tom 18, cz. 2
920--929
PL
Głównym celem niniejszego badania było oszacowanie, w jakim stopniu ponowne wykorzystanie szarej wody może przyczynić się do zaoszczędzenia wody dostarczanej do akademików. Badanie zostało przeprowadzone z udziałem studentów trzeciego roku Wileńskiego Uniwersytetu Technicznego im. Giedymina (Litwa). Ilość ponownie wykorzystanej wody mierzono w następujący sposób: dziennie (L/d) przez 24 godziny, tygodniowo L przez 7 dni i miesięcznie przez 30 dni. Ilość wody obliczono i oszacowano za pomocą charakterystyki technicznej zamontowanych kranów. Ponowne wykorzystanie wody jest jedną z kluczowych strategii systemu Zielonego Uniwersytetu na Litwie. Może ono pomóc uświadomić, że w studenckich akademikach potrzebne jest wprowadzenie energooszczędnego sprzętu, opartego na idei zrównoważonego rozwoju. Obecnie, możliwość ponowne go wykorzystania wody i energii jest określana tylko na podstawie funkcjonalności materiałowej lub analizy kosztów. Nie są brane pod uwagę środowiskowe, gospodarcze i społeczne aspekty zrównoważoności. W niniejszym badaniu, oceny możliwości ponownego wykorzystania wody i jej zaoszczędzenia dokonano za pomocą zintegrowanej metody oceny dostępnych możliwości. W celach porównawczych w badaniu odniesiono do przykładów z Unii Europejskiej.
5
Development of a fluidized batch process using natural powdered zeolite [clinoptilolite]
63%
Valentukeviciene M. , Rimeika M.
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2007
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tom 16
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nr 2
EN
The purpose of this research was to examine water treatment improvement by using natural powdered zeolite (clinoptilolite). Experiments were carried out at a laboratory and in a pilot-scaled water treatment plant. The pilot-scaled plant was fed with groundwater containing a high level of organic compounds from the existing waterworks in Lithuania’s Neringa Region. The content of organic substances in the groundwater – characterized by chemical oxygen demand (COD), varied between 5.0 – 40.0 mg O₂ l⁻¹ and the permanganate index (oxidation by potassium permanganate) 4.0 – 8.0 mg O₂ l⁻¹ was determined during this case study. There was no significant reduction using conventional water treatment. Laboratory analysis of water quality showed: total iron, ammonium, aluminium residual concentrations, pH, colour (Pt scale), turbidity, COD and permanganate index. The drinking water had an undesirable colour, taste and odour due to high concentrations of organic substances in the groundwater. A fluidized batch process and adsorption of natural powdered zeolite were used for reducing organic substances in the water with the effectiveness of total iron concentration reduction by 96%. Experimental research results are included in the article.
6
Assessment of readily biodegradable organic matter in Vilnius municipality's wastewater: a case study
51%
Dauknys R. , Matuzevicius A. , Nemanyte J. , Valentukeviciene M.
Annals of Warsaw Agricultural University. Land Reclamation
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2005
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tom 36
7
Content available Quality changes of drinking water in the water supply network [case study from Lithuania]
51%
Valentukeviciene M. , Amosenkiene A. , Dauknys R.
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
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2009
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tom 41
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nr 2
109-118
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