Iskanje po katalogu digitalne knjižnice

Opis: The purpose of this bachelor thesis is to optimize pretreatment of a wastewater from cosmetic industry. The current cleaning process in industry consists of two steps, namely i) AOP (Advanced Oxidation Process), and ii) flocculation/flotation (FF). However, as the HEM (n-Hexane Extractable Materials) decreases the efficiency of the AOP process by heavily blocking the light to penetrate in the wastewater to be cleaned, a first FF in acid environment is introduced in the process as pretreatment. The parameters that were varied to carry out the optimization were i) Fe2(SO4)3 content added in first FF and, ii) H2O2 content. To precise, JAR tests werecarried out to make the FF and the sample was put in a 1.8 L reactor and subjected to UV light in the AOP treatment. For the better distribution of the H2O2 and Fe2(SO4)3 addition to the cleaning process the design of experiment was used. The HEM measured wascarried out according to standard method “United States Environmental Protection Agency (EPA), Method 1664, Revision B: n-Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel Treated n-Hexane Extractable Material (SGT-HEM; Non-polar Material) by Extraction and Gravimetry”. We found that the percentage of removal is very high, it goes from 96.3% till more that 99.9%. In average, with this new first FF, the percentage of removal is 98.61% which represents a very high enough removal rate of HEM to achieve the WW disposal limits in most cases. Only 3 out of 9 experiments exceeded the emission limit of 100 mg/L of HEM due to the type of surfactant, which we can conclude it has a strong influence in the removal of HEM.
Ključne besede: AOP, n-hexane extractable material, wastewater pretreatment, flocculation/flotation
Objavljeno v DKUM: 22.10.2021; Ogledov: 852; Prenosov: 34
Celotno besedilo (1,67 MB)

Opis: Decolorization of Reactive Red 238, Reactive Orange 16, Reactive Black 5 and Reactive Blue 4 was studied in the UV/$H_2O_2$ process with $H_2O_2$ being produced electrochemically. The experimental results show that decolorization increased considerably when switching on the electrochemical production of $H_2O_2$. Complete decolorization (>99%) was achieved for all dyes under the applied experimental conditions, partial mineralization (49-85%) was obtained, which depends on the type of dye. Reactive Red 238 was used to investigate operational parameters and it was found that decolorization was influenced by the applied electrical current of the electrochemical cell and flow rate. Decolorization and mineralization of Reactive Red 238 can be described by pseudo-first order kinetics. It was found that the initial concentration of Reactive Red 238 has a negative influence on the pseudo-firstorder reaction constant.
Ključne besede: decolorization, hydrogen peroxide, reactive dyes, in-situ $H_2O_2$, AOP, Reactive Red 238
Objavljeno v DKUM: 10.07.2015; Ogledov: 1564; Prenosov: 81
Celotno besedilo (195,10 KB)
Gradivo ima več datotek! Več...

Ključne besede: Microsoft Office, CD-ROM, kompaktne plošče, računalništvo, računalniški programi, orodja, dokumenti, obdelava podatkov, baze podatkov, AOP, pisarniško poslovanje, podatki, tabele, preglednice, uporaba računalnika, PC, WordPerfect, urejevalniki besedil, Access, operacijski sistemi, komuniciranje
Objavljeno v DKUM: 10.07.2015; Ogledov: 1161; Prenosov: 46
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Ključne besede: CD-ROM, računalniške diskete, kompaktne plošče, računalništvo, programska oprema, software, računalniško programiranje, baze podatkov, obdelava podatkov, AOP, računalniške mreže, mreže, Internet, Basic, aplikacija, WWW, World Wide Web, UNIX, operacijski sistemi, COBOL, Windows, struktura
Objavljeno v DKUM: 10.07.2015; Ogledov: 1161; Prenosov: 39
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Ključne besede: banke, bančništvo, bančno poslovanje, potrošnik, management, vodenje, kupci, odjemalec, zadovoljstvo, informacije, projekti, programi, AOP, obdelava podatkov, baze podatkov, uporaba računalnika, pretok informacij, podatkovne strukture, medorganizacijsko trženje, upravljanje, poslovno okolje, Slovenija, storitve, spremembe, organizacija, izboljšave
Objavljeno v DKUM: 02.06.2012; Ogledov: 1781; Prenosov: 83
Celotno besedilo (673,78 KB)