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Titre du document / Document title

Disinfection of wastewater by hydrogen peroxide or peracetic acid: Development of procedures for measurement of residual disinfectant and application to a physicochemically treated municipal effluent

Auteur(s) / Author(s)

WAGNER Monika (1) ; BRUMELIS Daina ; GEHR Ronald (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Civil Engineering, McGill University, CANADA
(2) McGill University, Macdonald Engineering Building, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, CANADA

Résumé / Abstract

The Montreal Urban Community Wastewater Treatment Plant (MUCWTP) located in Montreal, Quebec, Canada, uses physicochemical treatment processes prior to discharging wastewater into the St. Lawrence River via an outfall tunnel of 2 hours retention time. Although chlorination facilities exist, they are not being used, and the MUCWTP is seeking alternative methods for disinfection to achieve a 2- to 3-log fecal coliform reduction. Liquid chemical disinfectants were attractive options because of their low capital costs. This led to an investigation of the feasibility of using hydrogen peroxide or peracetic acid. A method for measuring peroxycompounds (hydrogen peroxide or peracetic acid plus hydrogen peroxide) was developed using the peroxidase-based oxidation of 2,2'-azino-bis(3-ethylbenz-thiazoline-6-sulfuric acid) diammonium salt (ABTS) with hydrogen peroxide. The validity of the method was confirmed using effluent from the MUCWTP. Recovery was higher than 90% for peracetic acid levels as low as 1.0 mg/L. Quenching of hydrogen peroxide was achieved with 50-mg/L catalase; quenching of peracetic acid was achieved with 100 mg/L of sodium thiosulfate, followed by 50 mg/L of catalase. Batch disinfection tests were conducted on MUCWTP effluent. Hydrogen peroxide and peracetic acid in wastewater over time could be modeled as a second-order decay, with the decay constant being a function of the initial concentration of peroxycompounds. This function was the same for both hydrogen peroxide and peracetic acid, possibly indicating similar decomposition pathways in wastewater matrices. Disinfection was modeled using a modified Hom equation. Required doses of hydrogen peroxide to reach the target fecal coliform levels ranged from 106 to 285 mg/L, with the higher doses occurring when ferric chloride instead of alum was used as the coagulant. Hence, hydrogen peroxide was infeasible as a disinfectant for this application. On the other hand, the peracetic acid dose needed to achieve the target fecal coliform level was only 0.6 to 1.6 mg/L. Therefore, peracetic acid seems to be a promising disinfectant for physicochemical or primary effluent, or combined sewer overflows.

Revue / Journal Title

Water environment research    ISSN  1061-4303 

Source / Source

2002, vol. 74, no1, pp. 33-50 (33 ref.)

Langue / Language

Anglais

Editeur / Publisher

Water Environment Federation, Alexandria, VA, ETATS-UNIS  (1992) (Revue)

Mots-clés anglais / English Keywords

America

;

North America

;

Canada

;

Quebec

;

Physicochemical purification

;

Measurement

;

Disinfecting agent

;

Residual impurity

;

Peracetic acid

;

Hydrogen Peroxides

;

Disinfection

;

Waste water purification

;

Urban waste water

;

Mots-clés français / French Keywords

Amérique

;

Amérique du Nord

;

Canada

;

Québec

;

Epuration physicochimique

;

Mesure

;

Désinfectant

;

Impureté résiduelle

;

Peracétique acide

;

Hydrogène Peroxyde

;

Désinfection

;

Epuration eau usée

;

Eau usée urbaine

;

Mots-clés espagnols / Spanish Keywords

America

;

America del norte

;

Canada

;

Quebec

;

Depuración fisicoquímica

;

Medida

;

Desinfectante

;

Impureza residual

;

Peracético ácido

;

Hidrógeno Peróxido

;

Desinfección

;

Depuración aguas servidas

;

Agua usada urbana

;

Localisation / Location

INIST-CNRS, Cote INIST : 3089 B, 35400010052422.0040

Nº notice refdoc (ud4) : 13599364



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