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Affiliation(s)

1. Energy Department, Metropolitan Autonomous University, Azcapotzalco CDMX 02200, Mexico
2. Postgraduate Department, Occupational Health Safety and Hygiene, National School of Medicine and Homeopathy, National Polytechnic Institute, Ciudad de México, CDMX 07320, México
3. Basic Sciences Department, Metropolitan Autonomous University, Azcapotzalco CDMX 02200, Mexico
4. Construction HeBui
5. Civil Engineering Faculty, Michoacán University, UMSNH, Morelia 58030, Michoacan, Mexico

ABSTRACT

This paper, reports the performance of a wastewater treatment scale-pilot plant to treat 2 GPM (Gallons per Minute) discharges with 5,205 mg/L of pollutants expressed in COD (Chemical Oxygen Demand), from “Lomas de la Maestransa” a small community in Morelia City, Michoacan, Mexico. The scale-pilot plant is a train with (1) pretreatment with a triturated pump for floating solid, (2) primary treatment with “in line” coagulation, and rapid filtration to retain suspended colloids and dissolved solids higher of 5 µm diameter, (3) double advanced oxidation as secondary treatment with ozone and heterogeneous photo catalysis to oxidize volatile solids, and (4) tertiary treatment with activated carbon to retain refractory compounds. Plant performance was analyzed by a certified laboratory that belongs to Potable Water, Sewage and Sanitation Department from Morelia City Government. Results show that treated water effluent complied with the Mexican Official Standard NOM-001-SEMARNAT-1996 for discharges into national waters, with exception of fecal coliforms, since the raw water contains an average of 64,228,351 MNP/100 mL of fecal coliforms, and in spite that we obtained a 99.998% efficiency, the maximum level allowable 2,000 MPN/100 mL standard, was exceeded by 400 MPN/100 mL. After this experience, the wastewater treatment plant is equipped with a residual chlorine tank to keep a 1.5 ppm chlorine residual concentration to keep the treated water clean. This project was possible because we had the support of the Morelia Sanitation Department.

KEYWORDS

Secondary treatment, advanced oxidation, heterogeneous photo catalysis, “in line” coagulation, nitrogen compound reduction.

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