نتایج جستجو برای: the second option involves sand tank automatic disc filter
تعداد نتایج: 16148345 فیلتر نتایج به سال:
Biological rapid sand filters are often used to remove ammonium from groundwater for drinking water supply. They often operate under dynamic substrate and hydraulic loading conditions, which can lead to increased levels of ammonium and nitrite in the effluent. To determine the maximum nitrification rates and safe operating windows of rapid sand filters, a pilot scale rapid sand filter was used ...
We examine two corollaries of MOND pertaining to properties of the equivalent darkmatter halo. MOND predicts for pure exponential discs a tight relation involving the halo and disc scale lengths and the mean acceleration in the disc, which we find to test favorably against the Verheijen sample of Ursa Major galaxies. A correlation between halo and disc length scales is also apparent when the “m...
Abstract Introduction: Nowadays, the greatest of process type used in treatment of beverage water is conventional treatment. That it cannot remove organic matter effectively. Filtration is one of the most important treatment processes used in water treatment plant.The one of approaches, modification of conventional rapid sand filters into dual or multimedia filters. Methods: This study wa...
A series of pilot-scale tests were conducted with a continuous system composed of a stirring tank reactor, settling tank, and sand filter. In order to treat acidic drainage from a Pb-Zn mine containing high levels of heavy metals, the potential use of coal-mine drainage sludge (CMDS) was examined. The pilot-scale tests showed that CMDS could effectively neutralize the acidic drainage due to its...
an investigation into oral interaction in language classes: a conversation analytic point of view the aim of this thesis is to analyze the interaction between language teachers and students in english language institutes. this work is done in the context of yasuj city. learning another language, which is in most cases english, involves many variables. one of these variables is the linguistic...
Hydrocyclones are used as pre-filter to reduce suspended particles in irrigation water on the subsequent filters. The aim of study was determine separation efficiency (SE) hydrocyclones, called H1, H2 and H3 according inlet/outlet diameters, at velocities 1.0 (V10), 1.5 (V15) 2.0 (V20) ms-1, sands diameter 0.5 (D05), (D10), (D15), (D20) 2.5 (D25) mm. Therefore, a hydrocyclone laboratory test sy...
This study describes the new design and function of a modified version of a traditional slow sand filter. The Submerged Pond Sand Filter is built inside a pond and has a vertical as well as a horizontal flow of water through a sloped filter opening. The filter provides treated drinking water to a rural Indian village. The filter has functioned with minimal maintenance for five years without bei...
this experimental study has been conducted to test the effect of oral presentation on the development of l2 learners grammar. but this oral presentation is not merely a deductive instruction of grammatical points, in this presentation two hypotheses of krashen (input and low filter hypotheses), stevicks viewpoints on grammar explanation and correction and widdowsons opinion on limited use of l1...
Escherichia Coli is the ubiquitous microorganism contaminating the drinking water. This study is using granular bed filtration as a vigorous, simple and economical method to prevent the penetration of bacterial contamination, by discovering an alternative filter media from local source namely the burnt oil palm shell (BOPS). The result indicated that dual media BOPS/sand were higher reduction a...
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