Reduction of Coliforms presents in domestic residual waters by Air-Ozone Micro-Nanobubbles In Carhuaz city, Peru

Abstract

Peru generates approximately 2 217 946 m3 per day of wastewater discharged to the sewage system and only 32% receive treatment. The rest of the waters are discharged to the rivers, which have presence of fecal coliforms. Preliminary analyzes of the domestic wastewater of the Carhuaz district were carried out, with total coliforms (at 35ºC) of 240,000 CFU / 100 mL and thermotolerant coliforms (at 44.5ºC) of 130,000 CFU / 100mL at pH 7 , 17 exceeding the environmental standard values. The treatments were carried out with the air-ozone micro-nanobubbles generator with a water flow rate of 4.67 L/min and a pressure of the air-ozone mixture of 90 PSI, achieving a reduction of total coliforms up to 100 CFU/100 mL (99.96%) and fecal coliforms up to 100 CFU/100mL (99.92%)