Treatment of hospital laundry wastewater by UV/H2O2 process

Zotesso, Jaqueline Pirão; Cossich, Eneida Sala; Janeiro, Vanderly; Tavares, Célia Regina Granhen

doi:10.1007/s11356-016-6860-5

“…In this sense, increasing the temperature in Fenton oxidation could allow the treatment of the hospital wastewater in a single step as it has been proved to lead to a significant improvement of the oxidation rate and the mineralization percentage as well as a more efficient use of H 2 O 2 [28]. The proposed approach would allow taking advantage of the heat energy contained in the laundry stream since the laundering procedures imply the use of high temperature (>70 ºC) to assure disinfection of the hospital textiles [29][30][31], being responsible for 50% of hospitals water consumption [32].…”

Section: Introductionmentioning

confidence: 99%

Application of intensified Fenton oxidation to the treatment of hospital wastewater: Kinetics, ecotoxicity and disinfection

Muñoz

¹

,

García‐Muñoz

²

,

Pliego

³

et al. 2016

Journal of Environmental Chemical Engineering

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Fenton oxidation has proved to be effective for the treatment of a real hospital wastewater. The intensification of the process viz. the improvement on the efficiency of H2O2consumption, by increasing the temperature, is necessary to operate in a single step and avoid high reaction times and the need of large H2O2 and iron concentrations. This approach would allow taking advantage of the heat energy contained in the laundry stream since the washing process is performed at high temperature to assure disinfectionof the hospital textiles. In this work, temperatures within the range of 50-90 °C have been tested, which allowed an effective oxidation of the real wastewater ([COD]0 = 365 mg L-1, [Phenols]0 = 8.4 mg L-1, [total coliforms]0 = 4.16 × 106 MPN/100 mL, 5 toxicity units) with the stoichiometric amount of H2O2 (1000 mg L-1) and a relatively low iron concentration (25 mg L-1 Fe3+). Operating at 90 °C, complete disappearance of phenolic compounds and 70% and 50% reduction of COD and TOC were achieved in 1 h reaction time. Time evolution of those global parameters were appropriately fitted to pseudo-first and second order kinetic equations, providing a useful approach for design purposes. The main by-products were short-chain organic acids (oxalic and formic), being the final effluents non-toxic. Disinfection of the hospital wastewater was also achieved at all the operating temperatures tested, as confirmed by the absence of coliformsThis research has been supported by the CM through the project S2013/MAE-2716 and by the Spanish MINECO through the project CTQ2013-41963-R. M. Munoz thanks the Spanish MINECO for a Juan de la Cierva-Incorporación postdoctoral contract (IJCI-2014-19427

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“…In environmental studies of real effluents, sample degradation is a matter of great concern when long periods of experimentation are needed to determine the best conditions for a treatment process. 7 In this sense, in addition to carrying out the experiments with a maximum of 24 hours after collection, each procedure and control parameter was repeated five times. The mean value and standard deviation of the five repetitions were calculated.…”

Section: Discussionmentioning

confidence: 99%

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

Abreu

¹

,

Montel²,

Scapin³

2020

Preprint

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Water is a fundamental substance for the existence of life on earth. However, globally there is a freshwater crisis. Hospitals generate exorbitant volumes of effluents (5 to 15 times more toxic than urban ones). Hospital laundry is known for demanding the highest volumes of water, generating a proportional amount of complex effluents with high toxicity and recalcitrance. Adequate treatment for hospital wastewater is always an essential solution. Among all treatment methods, coagulation/flocculation emerges as one of the best alternatives. However, the use of traditional compounds such as aluminium sulfate has caused secondary pollution; its residues are harmful to public and environmental health. In this sense, the present study used natural compounds that do not cause adverse effects, such as chitosan/hydroxyapatite, to clarify the laundry effluents of the largest hospital from the Tocantins. The results showed that the hydroxyapatite associated with chitosan, at pH 6 and dosage of 50 mg/L, reduced the turbidity and apparent colour of these wastewaters by up to 67 and 55%, respectively. With lower performance and higher dosage (60 mg/L), the chitosan gel used (pH 6) promoted a maximum reduction of 35% of the apparent colour and 40% of turbidity.

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“…Despite being highly polluting, inside a hospital, these effluents can be treated and reused at a non-potable level and have the potential to reduce water consumption in these institutions, as well as avoid their direct disposal in the untreated urban sewage network. 7 For this purpose, several composite samples were submitted to C/F under different conditions of pH and dosage of C-Fs. The results of the study are shown in was observed that the effluents studied by Martins 164 have different characteristics -they can contain four times more oils and greases than those from hospital laundries.…”

Section: Evaluation Of the Coagulation And Flocculation Processmentioning

confidence: 99%

“…5,6 In a context in which water scarcity combined with surface water pollution represents one of the major problems today, the multiple activities that take place in health facilities, both medical and auxiliary, generate an exorbitant volume of wastewater, [7][8][9][10][11] with varying compositions, different types, and concentrations of different pollutants may be being released into the environment [11][12][13][14][15][16][17][18][19] through disposal without treatment in public sewage. 7,18,[20][21][22][23][24][25][26][27] Wastewater generated from health facilities poses a potential threat to the environment and public health due to the discharge of toxic chemicals that affect various aquatic species. 10,[28][29][30][31][32][33][34] In this sense, hospital effluents are 5 to 15 times more toxic than urban effluents.…”

Section: Introductionmentioning

confidence: 99%

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

Abreu¹,

Montel²,

Scapin³

2020

Preprint

0

View full text Add to dashboard Cite

Water is a fundamental substance for the existence of life on earth. However, globally there is a freshwater crisis. Hospitals generate exorbitant volumes of effluents (5 to 15 times more toxic than urban ones). Hospital laundry is known for demanding the highest volumes of water, generating a proportional amount of complex effluents with high toxicity and recalcitrance. Adequate treatment for hospital wastewater is always an essential solution. Among all treatment methods, coagulation/flocculation emerges as one of the best alternatives. However, the use of traditional compounds such as aluminium sulfate has caused secondary pollution; its residues are harmful to public and environmental health. In this sense, the present study used natural compounds that do not cause adverse effects, such as chitosan/hydroxyapatite, to clarify the laundry effluents of the largest hospital from the Tocantins. The results showed that the hydroxyapatite associated with chitosan, at pH 6 and dosage of 50 mg/L, reduced the turbidity and apparent colour of these wastewaters by up to 67 and 55%, respectively. With lower performance and higher dosage (60 mg/L), the chitosan gel used (pH 6) promoted a maximum reduction of 35% of the apparent colour and 40% of turbidity.

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Treatment of hospital laundry wastewater by UV/H2O2 process

Cited by 33 publications

References 38 publications

Application of intensified Fenton oxidation to the treatment of hospital wastewater: Kinetics, ecotoxicity and disinfection

Application of intensified Fenton oxidation to the treatment of hospital wastewater: Kinetics, ecotoxicity and disinfection

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

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