Integration of continuous biological and chemical (ozone) treatment of domestic wastewater: 1. Biodegradation and post‐ozonation
Identifieur interne : 000718 ( Main/Exploration ); précédent : 000717; suivant : 000719Integration of continuous biological and chemical (ozone) treatment of domestic wastewater: 1. Biodegradation and post‐ozonation
Auteurs : Fernando J. Beltrán [Espagne] ; Juan F. García Raya [Espagne] ; Pedro M. Álvarez [Espagne]Source :
- Journal of Chemical Technology & Biotechnology [ 0268-2575 ] ; 1999-09.
English descriptors
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Abstract
The continuous treatment of domestic wastewater by an activated sludge process and by an integrated biological–chemical (ozone) oxidation process were studied in this work. Chemical oxygen demand (COD), biochemical oxygen demand (BOD), absorbance at 254 nm (UV254) and nitrogenous compound content were the parameters followed in order to evaluate the performance of the two processes. Experimental data showed that both UV254 and COD reductions are improved in the combined biological–chemical oxidation procedure. Thus, reductions of 59.1% and 37.2% corresponding to COD and UV254, respectively were observed after the biological process (hydraulic retention time = 5 h; mixed liquor volatile suspended solids concentration = 3142 g m−3) compared with 71.0% and 78.4% obtained when a post‐ozonation step (D O3 = 41.7 g m−3) was included. During conventional activated sludge treatment, appropriate nitrification levels are only achieved with high hydraulic retention time and/or biomass concentration. Ozonation after the secondary treatment, however, allows improved nitrogen content reduction with total nitrite elimination. Post‐ozonation also leads to a higher biodegradability of the treated wastewater. Thus, the ultimate BOD/COD ratio goes from 0.16 after biological oxidation to 0.34 after post‐ozonation with 41.7 g O3 m−3. © 1999 Society of Chemical Industry
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DOI: 10.1002/(SICI)1097-4660(199909)74:9<877::AID-JCTB117>3.0.CO;2-2
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Biotechnol.</title><idno type="ISSN">0268-2575</idno><idno type="eISSN">1097-4660</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="1999-09">1999-09</date><biblScope unit="volume">74</biblScope><biblScope unit="issue">9</biblScope><biblScope unit="page" from="877">877</biblScope><biblScope unit="page" to="883">883</biblScope></imprint><idno type="ISSN">0268-2575</idno></series><idno type="istex">7E967ECC4C647C1205E3C7A7B0571E09321AD5A3</idno><idno type="DOI">10.1002/(SICI)1097-4660(199909)74:9<877::AID-JCTB117>3.0.CO;2-2</idno><idno type="ArticleID">JCTB117</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0268-2575</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>activated sludge</term><term>domestic sewage</term><term>ozone</term><term>wastewater treatment</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The continuous treatment of domestic wastewater by an activated sludge process and by an integrated biological–chemical (ozone) oxidation process were studied in this work. Chemical oxygen demand (COD), biochemical oxygen demand (BOD), absorbance at 254 nm (UV254) and nitrogenous compound content were the parameters followed in order to evaluate the performance of the two processes. Experimental data showed that both UV254 and COD reductions are improved in the combined biological–chemical oxidation procedure. Thus, reductions of 59.1% and 37.2% corresponding to COD and UV254, respectively were observed after the biological process (hydraulic retention time = 5 h; mixed liquor volatile suspended solids concentration = 3142 g m−3) compared with 71.0% and 78.4% obtained when a post‐ozonation step (D O3 = 41.7 g m−3) was included. During conventional activated sludge treatment, appropriate nitrification levels are only achieved with high hydraulic retention time and/or biomass concentration. Ozonation after the secondary treatment, however, allows improved nitrogen content reduction with total nitrite elimination. Post‐ozonation also leads to a higher biodegradability of the treated wastewater. Thus, the ultimate BOD/COD ratio goes from 0.16 after biological oxidation to 0.34 after post‐ozonation with 41.7 g O3 m−3. © 1999 Society of Chemical Industry</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Estrémadure</li></region><orgName><li>Université d'Estrémadure</li></orgName></list><tree><country name="Espagne"><region name="Estrémadure"><name sortKey="Beltran, Fernando J" sort="Beltran, Fernando J" uniqKey="Beltran F" first="Fernando J" last="Beltrán">Fernando J. Beltrán</name></region><name sortKey="Alvarez, Pedro M" sort="Alvarez, Pedro M" uniqKey="Alvarez P" first="Pedro M" last="Álvarez">Pedro M. Álvarez</name><name sortKey="Garcia Raya, Juan F" sort="Garcia Raya, Juan F" uniqKey="Garcia Raya J" first="Juan F" last="García Raya">Juan F. García Raya</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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