Determinacion De Microorganismos Patogenos En Aguas Residuales Domesticas, Merida, Mexico

Determination of pathogen microorganisms in domestic wastewater treatment plants in Mérida, México A background

Supervisor: Dr. Carlos Quintal Franco Dr. Carmen Ponce Caballero

INTRODUCTION
•The microbiological quality of water is affected by:
Contamination of natural aquifer due to domestic wastewater discharges (DWD), therefore:
(-) - 884 millions of people withouth access to cleanwater. - 1.5 million of children died each year as consecuence of waterborne diseases (ONU 22/03/2010). Ecosistem impact (-)

Health impact

BIOLOGICAL QUALITY OF WATER

CONTAMINATION DUE TODOMESTIC WASTEWATER (DWW)

ANALISIS DE PATHOGENS

BIOINDICATORS

Alternative Bioindicators

Regulations

Emergent Diseases

México:

Volumen of municipal wastewater (m3/s) GeneratedCaptured in sewage system treated
Source: PNH 2007-2012

242 206 74.4 (36.1%)

Yucatán:

GENERAL OBJETIVE
• Evaluate the presence of pathogen microorganisms pre and pos-treatment in domesticwastewater plants

Plants Plant 1 Plant 2 Plant 3

(Lps) 2 10 8

Annual Volume treated (m3) 62,208 311,040 185,624

Step 1 Screening Screening Screening

Treatment System Step 2 Paso 3 Anaerobicdigestor activate sludge /extend aereation activate sludge /conventional aereation Percolate filter Sedimentator Sedimentator

Paso 4 Clorination Clorination Clorination

DWTP 1

DWTP 2

DWTP3

DWTP: Domestic Wastewater Treatment Plant

Results and Discussions
1. Identifyed microorganisms in DWW • Bacteria
BACTERIA Fecal Coliforms Total Coliforms Salmonella spp. Staphylococusaureus Enterococcus spp. Escherichia Coli Total Aerobic Count Yeast and Mold COCE (CF) (CT) (SLL) (STA) (ENT) (EC) (TAC) (YAM)

• Parásits
HELMINTS EGGS Áscaris Hymenolepis Ancylostoma Uncinaria TaeniaTrichuris Trichura Paramecium spp. Strongyloides spp. CODE (ASC) (HYM) (ANC) (UNC) (TAE) (TRT) (BAL) (STR)

2. Microbiological characterisation of inffluents

Influents Total Average

CT...