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

Result code in 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>

Alternative codes found

RIV/60460709:41310/18:76666

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

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

Name of the periodical

Waste Forum

ISSN

1804-0195

e-ISSN

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Volume of the periodical

2018

Issue of the periodical within the volume

2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

10

Pages from-to

98-107

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85048975794