Abstract

MUNOZ-NAVA, Hipólito  and  BAUMANN, Jürgen. Coliform bacteria removal through a system of activated sludge and constructed Wetland. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.11, pp.287-297. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n11.913.

Municipal wastewater contains huge amounts of coliforms that represent a risk to public health and can pollute the environment. The goal of this study was to evaluate the removal of total coliforms (TC), Escherichia coli (EC), and chemical oxygen demand (COD) from wastewater by using a pilot system with sequencing batch reactor (SBR) activated sludge and vertical flow constructed wetland (VFCW). Average concentration of TC, EC and COD in the influent were 8.03X106, 4.13X106 NMP (100 mL)-1, and 528 mg L-1, respectively; the average removal percent (RP) were 99.84 % (4.52 log units), 99.92 % (4.92 log units), and 92.78 % for TC, EC, and COD, respectively. This removal, obtained with 11 h of time residence, meets with Mexican requirements for water reuse. Correlation analysis showed that the COD was not correlated with TC and EC. Measures flux effluent, and TC and EC concentrations from the outflow of VFCW show that these variables are related. Plots of TC and EC concentrations from VFCW versus time were skewed to the left; this result is similar as observed in porous medium. Therefore, communities can use this system to reuse treated wastewater in agriculture irrigation.

Keywords : Chemical oxygen demand; Escherichia coli; effluent flux; wetland.

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