Abstract

VIZCAINO MENDOZA, Lissette  and  FUENTES MOLINA, Natalia. EFECTOS DE Eisenia foetida y Eichhornia crassipes EN LA REMOCIÓN DE MATERIA ORGÁNICA, NUTRIENTES Y COLIFORMES EN EFLUENTES DOMÉSTICOSEFFECTS OF Eisenia foetida AND Eichhornia crassipes IN THE REMOVAL OF ORGANIC MATTER, NUTRIENTS AND COLIFORMS IN DOMESTIC WASTEWATER. rev.udcaactual.divulg.cient. [online]. 2016, vol.19, n.1, pp.189-198. ISSN 0123-4226.

In order to determine the purifying capacity of a potentially applicable biological system as an alternative for reducing the pollution load of domestic sewage effluent in the municipality of San Juan del Cesar, under laboratory scale the effect of treatment with Eisenia foetida and Eichhornia crassipes in the removal of organic matter, nutrients and pathogens was evaluated. During one month, three treatments were applied; T1: E. foetida (dynamic aerobic biofilter vertical flow), T2: E. crassipes (horizontal flow system with floating plants) and T3: E. foetida + E. crassipes (series system); using hydraulic retention times of 24h and flow of 0,125L/min (E. foetida) and 0,020L/min (E. crassipes). Concentration of total solids, total suspended solids (TSS), turbidity, biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total nitrogen, phosphate, total coliforms and Escherichia coli in 30 analyzed samples (10 for each system) were determined. T1 was more efficient in the removal of COD 69.2 %; T2 eliminated 100% of TSS, while T3 reported the best removal efficiencies for the other variables analyzed. There are significant differences p<0.05 in the removal of organic matter, nutrients and coliforms by the treatments applied. The Pearson correlation matrix indicates that there is direct relationship between removal p≤0.01 ST and decreased concentrations of COD, total coliforms and E. coli. Finally Tukey HDS test confirmed that T3 except for BOD were the most efficient in the treatment of all the variables analyzed p<0.05.

Keywords : BOD; COD; constructed wetlands; earthwormfilters; biological treatment.

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