Temat: HBP - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preparation and Characterization of a Novel Hyperbranched Polyester Polymers Using A2+B3 Monomers
Autorzy:: Al-Mutairi, Nabeel Hasan
Al-Zubiedy, Ali
Al-Zuhairi, Ali J
Powiązania:: https://bibliotekanauki.pl/articles/26081324.pdf
Data publikacji:: 2023
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: hiperrozgałęziony poliester HBP
monomer A2+B3
polycondensation
1H-NMR
GPC
hyperbranched polyester HBP
A2+B3 monomer
Opis:: Compared to linear analogs, hyperbranched polymers (HBPs) have gotten much attention in the last decade because of their intrinsic globular topologies and distinctive features like low viscosity, high solubility, and a high degree of functionality. In this work, four types of hyperbranched polyester polymer HBPs have been synthesized using the A2+B3 polycondensation methodology. Firstly, the starting material B3 monomer (Pyrimidine-2,4,6-triol) has been synthesized using urea and malonic acid with the presence of sodium Na as the catalyst for the reaction. Secondly, four types of materials (tartaric acid TA, adipic acid AD, maleic acid MA, and phthalic anhydride PA) as A2 monomers were added to the starting material B3 monomer in an oil bath to prepare the four types of HBP. The chemical structure of HBPs was characterized by FTIR, and 1H-NMR. The molecular weight of the prepared HBPs was characterized by gel permeation chromatography GPC, and thermal properties were characterized by differential scanning calorimetry DSC and thermal gravimetric analysis TGA. FTIR results showed that there are new bands, such as C-O-C between A2 and B3 monomers, as indicated by 1H-NMR. In addition, GPC shows that the prepared polymers have a narrow molecular weight distribution with good thermal stability, as indicated by DSC and TGA.
Źródło:: Production Engineering Archives; 2023, 29, 1; 28--36
2353-5156
2353-7779
Pojawia się w:: Production Engineering Archives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wpływ obciążenia osadu ładunkiem zanieczyszczeń organicznych na wzrost wybranych grup bakterii podczas procesu oczyszczania odcieków ze składowiska odpadów w SBR 443
Influence of Sludge Loading with Contaminants on the Growth of Selected Groups of Bacteria During Landfill Leachate Pretreatment in SBR
Autorzy:: Szyłak-Szydłowski, M.
Grabińska-Łoniewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/1825993.pdf
Data publikacji:: 2008
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: zanieczyszczenia mikrobiologiczne
biologiczne oczyszczanie ścieków
osad czynny
bakterie
bakterie psychrofilne
HBP
bakterie sporowe
bakterie mezofilne
bakterie coli
Opis:: Celem badań bakteriologicznych było określenie wpływu obciążenia osadu czynnego ładunkiem zanieczyszczeń organicznych (Bx) na rozwój w nim wybranych grup bakterii będących wskaźnikami stopnia rozkładu związków organicznych i zanieczyszczenia pod względem sanitarnym. Założeniem tych badań było ustalenie zakresu Bx, przy którym zachodzi eliminacja tych bakterii z odcieków połączona z ich akumulacją w kłaczkach osadu oraz oszacowanie stopnia zagrożenia sanitarnego dla środowiska przy jego ewentualnym wykorzystaniu do celów rolniczych. Wskaźnikami stopnia rozkładu zanieczyszczeń organicznych występujących w odciekach, była ogólna liczba heterotroficznych bakterii psychrofilnych (HBP) i bakterii sporowych (BS), a zanieczyszczenia pod względem sanitarnym: bakterie mezofilne (BM), bakterie z rodziny Enterobacteriaceae, termotolerancyjne bakterie grupy coli (TBGC) oraz Clostridium perfringens.
Assessment of the influence of activated sludge loading with organic contaminants (Bx) on the development in it of selected groups of bacteria, which are indexes of decomposition degree of organic compounds and sanitary contamination, was the aim of conducted biological investigations. Determination of Bx range, in which elimination from leachate of those bacteria connected with their accumulation in floccules of activated sludge takes place as well as estimation of level of sanitary threat for the environment when it is used in agriculture were aims was of these investigations. Indexes of degree of organic contaminants decomposition occurring in leachates were: general number of heterotrophic psychrophilic bacteria (HBP) and sporeforming bacteria (BS), and sanitary contamination were: mesophilic bacteria (BM), bacteria from Enterobacteriaceae family, thermotolerant bacteria of cola group (TBGC) and Clostridium perfringens. Leachate used in investigations were piped off with drainage system to cumulative well located near landfill of wastes other than inert and dangerous, so-called municipal situated in the south-east part of Otwock city. Landfill functions from 1998 and the planned end of exploitation is anticipated in the year 2012. Municipal wastes in the quantity over 20 Mg per day are deposited in it. Dominating group of bacteria both in leachates and activated sludge adapted to their pretreatment constituted heterotrophic psychrophilic (HPB) and mesophilic bacteria (MB). Less numerous were sporeforming bacteria (BS) and the bacteria from the class Enterobacteriaceae. The greatly lower numbers of thermotolerant coliform bacteria (TCB) and Cl. perfringens were stated. Among the studied groups of bacteria - HPB, BM, TCB and bacteria from class Enterobacteriaceae showed the most stable growth in activated sludge. The washing out of these bacteria occurred at the maximal studied Bx = 1.64 mgCOD mg-1 d-1. Less stable growth characterized Cl. perfringens (washing out at Bx = 0.96 mgCOD mg-1 d-1). Fast washing out of SB (Bx = 0.34 mgCOD mg-1 d-1) took place. The number of these groups of bacteria in activated sludge and effluent from SBR don't constitute a sanitary impedence for environment. Conducted investigations allow to state, that both leachates outflowing from SBR as well as excessive activated sludge coming into being in the process of treatment, taking into consideration size of investigated bacteria groups does not make up sanitary threat for the environment. However full distinguishing in this issue may be made just after executing investigations on occurrence and size in those biotopes of bacteria and microscopic fungi pathogenic for warm-blooded animals and human.
Źródło:: Rocznik Ochrona Środowiska; 2008, Tom 10; 443-456
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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