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Keywords = xylit

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17 pages, 3684 KiB  
Article
A Preliminary Study on the Use of Xylit as Filter Material for Domestic Wastewater Treatment
by Marcin Spychała, Tadeusz Nawrot and Radosław Matz
Appl. Sci. 2021, 11(11), 5281; https://doi.org/10.3390/app11115281 - 7 Jun 2021
Cited by 4 | Viewed by 2333
Abstract
The aim of the study was to verify two morphological forms (“angel hair” and “scraps”) of xylit as a trickling filter material. The study was carried out on two types of polluted media: septic tank effluent (STE) and seminatural greywater (GW). The basic [...] Read more.
The aim of the study was to verify two morphological forms (“angel hair” and “scraps”) of xylit as a trickling filter material. The study was carried out on two types of polluted media: septic tank effluent (STE) and seminatural greywater (GW). The basic wastewater quality indicators, namely, chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total suspended solids (TSS), ammonium nitrogen (NNH4), and total phosphorus (Ptot) were used as the indicators of treatment efficiency. Filtering columns filled with the investigated material acted as conventional trickling filters at a hydraulic load of 376–472 cm3/d during the preliminary stage, 198–245 cm3/d during stage I, and 184–223 cm3/d during stage II. The removal efficiency of the two morphological forms of xylit did not differ significantly. The average efficiencies of treatment were as follows: for COD, over 70, 80, and 85% for preliminary stage, stage I and stage II, respectively; for BOD5, 77–79% (preliminary stage); for TSS, 42% and 70% during the preliminary stage, and 88, 91, and 65% during stage I; for NNH4, 97–99% for stage I and 36–49% for stage II; for Ptot, 51–54% for stage I and 52–56% for stage II. The study demonstrated that xylit was a material highly effective in wastewater quality indicators removal, even during the initial period of its use. Full article
(This article belongs to the Special Issue Wastewater Treatment and Waste Remediation: Recent Advances)
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16 pages, 9030 KiB  
Article
Thermokinetics of Brown Coal during a Fluidized Drying Process
by Zbigniew Plutecki, Paweł Sattler, Krystian Ryszczyk, Anna Duczkowska and Stanisław Anweiler
Energies 2020, 13(3), 684; https://doi.org/10.3390/en13030684 - 5 Feb 2020
Cited by 2 | Viewed by 2902
Abstract
This paper presents the results of research describing the thermokinetics of brown coal’s (lignite) drying process in a fountain-bubble fluidized bed dryer. The drying medium was atmospheric air of a variable temperature in subsequent tests, which ranged from 27 to 70 °C. This [...] Read more.
This paper presents the results of research describing the thermokinetics of brown coal’s (lignite) drying process in a fountain-bubble fluidized bed dryer. The drying medium was atmospheric air of a variable temperature in subsequent tests, which ranged from 27 to 70 °C. This paper presents the results of many experimental studies for two different types of brown coal: xylite, from the Bełchatów mine, and earth, from the Turów mine. The two types of brown coal are used to assess different sized coal particles and different air drying temperatures. The functions parameterizing the moisture content of dried coal at different air drying temperatures at any given time are also presented. Full article
(This article belongs to the Section L: Energy Sources)
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