EVALUATION OF THE EFFICIENCY OF A VERMIFILTER WITH THE Eisenia Foetida SPECIES FOR THE TREATMENT OF WASTEWATER FOR DOMESTIC USE

Abstract

The vermifilter with the species Eisenia Foetida to treat wastewater for domestic use had a flow rate of 217 L/d, a Hydraulic Head (CH) of 150 ml/m².min and a Hydraulic Retention Time (HRT) of 5.7 days. Wastewater samples without treatment and with treatment were analyzed on three dates, every 7 days, and the following results were obtained: Total Suspended Solids (TSS) from 1708 mg/L to 32 mg/L on the first date, 321 mg/ L to 34 mg/L on the second and 154 mg/L to 2.5 mg/L on the third date. Total Nitrogen (NT) from 13.05 mg/L to 0.32 mg/L, from 3.04 mg/L to 0.19 mg/L and 2.75 mg/L to 0.09 mg/L. Total Phosphorus (PT) from 1 mg/L to 0.568 mg/L, from 1 mg/L to 0.23 mg/L and 0.302 mg/L to 0.092 mg/L. Oils and Fats (AyG) from 72.5 mg/L to 2 mg/L, from 4.3 mg/L to 2 mg/L and 19.8 mg/L to 2 mg/L. Chemical Oxygen Demand (COD) from 3210 mg/L to 201 mg/L, from 1110 mg/L to 101 mg/L and 434 mg/L to 84 mg/L. Biochemical Oxygen Demand (BOD) from 1690 mg/L to 112 mg/L, from 572 mg/L to 48 mg/L and 230 mg/L to 40 mg/L respectively. Total Coliforms (TC) from 7.0E+07 NMP/100mL to 2.6E+06 NMP/100mL, 1.1E+08 NMP/100mL to 5.4E+05 NMP/100mL and 4.7E+07 NMP/100mL to 3.5E+04 NMP/100mL. It is concluded that the vermifilter with the Eisenia Foetida species is efficient to treat wastewater for domestic use.