The reduction of COD in wash wastewater from regeneration of sand filters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39913242" target="_blank" >RIV/00216275:25310/18:39913242 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60460709:41310/18:76666

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The reduction of COD in wash wastewater from regeneration of sand filters

Popis výsledku v původním jazyce

The paper describes the reduction of COD and TOC in wastewater from the production of viscous fibers produced by the washing of sand filters on a laboratory scale. In addition to a significant concentration of zinc (8 – 30 mg), these waters also exhibited high values of COD (7 – 10 g/l) and TOC (2.5 – 3.1 g/l) respectively. A lot of organic substances, especially hemicellulose, residues of viscose fibers and non-ionic surfactants, are to be blamed for this. The organic matrix consisted of both solid and dissolved components, and therefore filtration was used for pre-treatment. The filtration itself has reduced the organic pollution by about 40 – 50 % depending on the porosity of the filter used. Pretreated wastewater was further oxidized by Fenton oxidation using 30% hydrogen peroxide and electrochemically generated Fe2+ ion in a 1:10 and 1: 100 molar ratios. Fenton oxidation has proven to be a highly effective tool for both COD and TOC reduction during 5 – 7 hours of oxidation, with a COD decrease by up to 95 % and a TOC decrease by 83 – 91 %. It is obvious that there is a considerable degree of mineralization of the dissolved organic matter in this case. The subsequent neutralization of the oxidized water to pH = 7.25 – 7.5 led to the simultaneous precipitation of iron ions and Zn2+ions. After their filtration, the zinc concentration dropped below 1 mg/l. Ozonation is an appealing way of purifying wastewater, as it allows water to be oxidized without pretreatment. However, the output of the available OZONSTAR 100 ozonizer with the hourly production of 1g of O3 was too low. Estimated required ozonizer output for a given type of wastewater is at least 0.1 – 0.2 kg O3/h per 1 m3. Nevertheless, both key group parameters of COD and TOC decreased in this case.

Název v anglickém jazyce

The reduction of COD in wash wastewater from regeneration of sand filters

Popis výsledku anglicky

The paper describes the reduction of COD and TOC in wastewater from the production of viscous fibers produced by the washing of sand filters on a laboratory scale. In addition to a significant concentration of zinc (8 – 30 mg), these waters also exhibited high values of COD (7 – 10 g/l) and TOC (2.5 – 3.1 g/l) respectively. A lot of organic substances, especially hemicellulose, residues of viscose fibers and non-ionic surfactants, are to be blamed for this. The organic matrix consisted of both solid and dissolved components, and therefore filtration was used for pre-treatment. The filtration itself has reduced the organic pollution by about 40 – 50 % depending on the porosity of the filter used. Pretreated wastewater was further oxidized by Fenton oxidation using 30% hydrogen peroxide and electrochemically generated Fe2+ ion in a 1:10 and 1: 100 molar ratios. Fenton oxidation has proven to be a highly effective tool for both COD and TOC reduction during 5 – 7 hours of oxidation, with a COD decrease by up to 95 % and a TOC decrease by 83 – 91 %. It is obvious that there is a considerable degree of mineralization of the dissolved organic matter in this case. The subsequent neutralization of the oxidized water to pH = 7.25 – 7.5 led to the simultaneous precipitation of iron ions and Zn2+ions. After their filtration, the zinc concentration dropped below 1 mg/l. Ozonation is an appealing way of purifying wastewater, as it allows water to be oxidized without pretreatment. However, the output of the available OZONSTAR 100 ozonizer with the hourly production of 1g of O3 was too low. Estimated required ozonizer output for a given type of wastewater is at least 0.1 – 0.2 kg O3/h per 1 m3. Nevertheless, both key group parameters of COD and TOC decreased in this case.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Waste Forum

ISSN

1804-0195

e-ISSN

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Svazek periodika

2018

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

10

Strana od-do

98-107

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85048975794