Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation
The objective of this work was to study chemical precipitation as an alternative to eliminate the COD of the final effluent, to comply with the regulations. The work involved liquids entering the primary treatment of a neutral sulfite semichemical pulp (NSSC) mill. After performing the overall chara...
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| Language: | Spanish |
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Facultad de Ciencias Exactas, Químicas y Naturales
2010
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| Online Access: | https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/520 |
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ojs-article-5202020-03-06T10:52:51Z Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation Reducción de la DQO recalcitrante de efluentes de pulpados semiquímicos mediante precipitación química Felissia, Fernando E. Barboza, Olga M. Bengoechea, Dora I. Area, María C. Liquid effluent Semichemical processes COD Chemical precipitation Aluminiun sulphate Efluentes Líquidos Procesos semiquímicos DQO Precipitación química Sulfato de aluminio The objective of this work was to study chemical precipitation as an alternative to eliminate the COD of the final effluent, to comply with the regulations. The work involved liquids entering the primary treatment of a neutral sulfite semichemical pulp (NSSC) mill. After performing the overall characterization of the liquids, the flocculation with coagulants and flocculants was tested. The influence of pH, the incorporation of calcium hydroxide and sodium hydroxide, and the coagulant dosages were studied. Chemical Oxygen Demand (COD), lignosulphonate (NaLS) concentration, colour, turbidity, solids, and ash were determined in teh supernatants obtained from the different treatments. The greatest reductions with aluminum salts were 50% in COD and 63% of NaLS using 1000mg/L Al2(SO4)3, and 58% of the COD, 53% of NaLS and 96% of color, using 6000mg/L of Poly-aluminum Chloride (PAC), on diluted (0.33% solids, COD of 2280mg/L) and concentrate (1.60% solids and COD of 13 280) liquids respectively. Reductions of NaLS and COD were achieved in the diluted liquid spent with 100 mg/L of a cationic polyacrylamide. El objetivo del trabajo es estudiar la precipitación química como alternativa de reducción de la DQO del efluente, a fin de encuadrar este parámetro en las legislaciones vigentes. Se trabajó con líquidos residuales de ingreso al clarificador primario de una fábrica semiquímica al sulfito neutro (NSSC), los que fueron caracterizado, realizando luego ensayos de floculación con coagulantes y floculantes. Se estudió la influencia del pH, la incorporación de Ca(OH)2 e NaOH y la dosificación de coagulantes. En los sobrenadantes de los distintos tratamientos se determinaron: demanda química de oxígeno (DQO), concentración de lignosulfonatos (NaLS), color, turbidez, sólidos y cenizas. Las mayores reducciones con sales de aluminio fueron 50% en DQO 63% dse NaLS con 1000mg/L de Al2(SO4)3 y de 58% de la DQO, 53% de NaLS y 96% del color, utilizando 6000mg/L de policloruro de aluminio (PAC) sobre líquidos residuales diluido (0,33% de sólidos, DQO de 2280mg/L) y concentrado (1,60% de sólidos y DQO de 13280) respectivamente. Con 100 mg/L de una poliacrilamida catiónica se logró una reducción de la DQO y de NaLS del 34% en el líquido residual diluido. Facultad de Ciencias Exactas, Químicas y Naturales 2010-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/520 Argentine Journal of Science and Technology; Vol. 13 No. 1 (2010); 36-42 Revista de Ciencia y Tecnología; Vol. 13 Núm. 1 (2010); 36-42 1851-7587 0329-8922 spa https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/520/433 Derechos de autor 2010 Revista de Ciencia y Tecnología |
| institution |
Facultad de Ciencias Exactas Quimicas y Naturales |
| collection |
Revista de Ciencia y Tecnologia RECyT |
| language |
Spanish |
| topic |
Liquid effluent Semichemical processes COD Chemical precipitation Aluminiun sulphate Efluentes Líquidos Procesos semiquímicos DQO Precipitación química Sulfato de aluminio |
| spellingShingle |
Liquid effluent Semichemical processes COD Chemical precipitation Aluminiun sulphate Efluentes Líquidos Procesos semiquímicos DQO Precipitación química Sulfato de aluminio Felissia, Fernando E. Barboza, Olga M. Bengoechea, Dora I. Area, María C. Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| topic_facet |
Liquid effluent Semichemical processes COD Chemical precipitation Aluminiun sulphate Efluentes Líquidos Procesos semiquímicos DQO Precipitación química Sulfato de aluminio |
| format |
Online |
| author |
Felissia, Fernando E. Barboza, Olga M. Bengoechea, Dora I. Area, María C. |
| author_facet |
Felissia, Fernando E. Barboza, Olga M. Bengoechea, Dora I. Area, María C. |
| author_sort |
Felissia, Fernando E. |
| title |
Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| title_short |
Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| title_full |
Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| title_fullStr |
Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| title_full_unstemmed |
Reduction of the recalcitrant COD of semi-chemical pulp effluents by chemical precipitation |
| title_sort |
reduction of the recalcitrant cod of semi-chemical pulp effluents by chemical precipitation |
| title_alt |
Reducción de la DQO recalcitrante de efluentes de pulpados semiquímicos mediante precipitación química |
| description |
The objective of this work was to study chemical precipitation as an alternative to eliminate the COD of the final effluent, to comply with the regulations. The work involved liquids entering the primary treatment of a neutral sulfite semichemical pulp (NSSC) mill. After performing the overall characterization of the liquids, the flocculation with coagulants and flocculants was tested. The influence of pH, the incorporation of calcium hydroxide and sodium hydroxide, and the coagulant dosages were studied. Chemical Oxygen Demand (COD), lignosulphonate (NaLS) concentration, colour, turbidity, solids, and ash were determined in teh supernatants obtained from the different treatments. The greatest reductions with aluminum salts were 50% in COD and 63% of NaLS using 1000mg/L Al2(SO4)3, and 58% of the COD, 53% of NaLS and 96% of color, using 6000mg/L of Poly-aluminum Chloride (PAC), on diluted (0.33% solids, COD of 2280mg/L) and concentrate (1.60% solids and COD of 13 280) liquids respectively. Reductions of NaLS and COD were achieved in the diluted liquid spent with 100 mg/L of a cationic polyacrylamide. |
| publisher |
Facultad de Ciencias Exactas, Químicas y Naturales |
| publishDate |
2010 |
| url |
https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/520 |
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