TY - JOUR

T1 - Electrooxidation Combined with Ozonation in Hospital Laundry Effluents Treatment

AU - Lutterbeck, C.A.

AU - de Oliveira Schwaickhardt, Rômulo

AU - Straatmann, Alexandre

AU - Kist, Lourdes Teresinha

AU - Lobo, Eduardo Alcayaga

AU - Machado, Ênio Leandro

PY - 2014/5

Y1 - 2014/5

N2 - In the present study, treatment tests were performed on effluents generated from a hospital laundry using electrooxidation (EO) processes. Global parameter analyses and toxicological analyses were conducted before and after each trial. The analytical characterization of the effluent fractions from the hospital laundry revealed variable toxicities ranging from slightly toxic for the composite sample and extremely toxic for the Wash stage. Another parameter related to refractoriness at different currents involved measuring the chemical oxygen demand/biochemical oxygen demand (COD/BOD 5) ratio, and a maximum ratio of 34.72 was observed in effluents from the wash stage. Ozonation, EO processes with iron electrodes alone, and combined with ozonation (EO/O 3 and EO+O 3) were used for the treatment tests. The tests involving the EO process for 60min with induced conductivity through the addition of NaCl exhibited the best performance. Considering the best performance in previous assays, only the electrochemical methods were evaluated with the toxicological analyses. The application of the three-electrochemical methods provided detoxification levels that improved to moderately or slightly toxic. In one of the conditions, the effluent generated in the initial rinse of the linens improved from the condition of extremely toxic (12.58%) to moderately toxic (61.59%), while the COD decreased by 9%. With respect to the effluent coming from the wash step, the COD showed a 41% reduction, while the toxicity was reduced considerably from the condition of extremely toxic (6.89%) to slightly toxic (76.65%).

AB - In the present study, treatment tests were performed on effluents generated from a hospital laundry using electrooxidation (EO) processes. Global parameter analyses and toxicological analyses were conducted before and after each trial. The analytical characterization of the effluent fractions from the hospital laundry revealed variable toxicities ranging from slightly toxic for the composite sample and extremely toxic for the Wash stage. Another parameter related to refractoriness at different currents involved measuring the chemical oxygen demand/biochemical oxygen demand (COD/BOD 5) ratio, and a maximum ratio of 34.72 was observed in effluents from the wash stage. Ozonation, EO processes with iron electrodes alone, and combined with ozonation (EO/O 3 and EO+O 3) were used for the treatment tests. The tests involving the EO process for 60min with induced conductivity through the addition of NaCl exhibited the best performance. Considering the best performance in previous assays, only the electrochemical methods were evaluated with the toxicological analyses. The application of the three-electrochemical methods provided detoxification levels that improved to moderately or slightly toxic. In one of the conditions, the effluent generated in the initial rinse of the linens improved from the condition of extremely toxic (12.58%) to moderately toxic (61.59%), while the COD decreased by 9%. With respect to the effluent coming from the wash step, the COD showed a 41% reduction, while the toxicity was reduced considerably from the condition of extremely toxic (6.89%) to slightly toxic (76.65%).

KW - Chemistry

KW - Effluent treatment

KW - Electrooxidation

KW - Hospital laundry effluents

UR - http://www.scopus.com/inward/record.url?scp=84899481419&partnerID=8YFLogxK

U2 - 10.1002/clen.201200580

DO - 10.1002/clen.201200580

M3 - Journal articles

VL - 42

SP - 601

EP - 608

JO - Clean - Soil, Air, Water

JF - Clean - Soil, Air, Water

SN - 1863-0650

IS - 5

ER -