Efficiency of rhizobacteria of Scirpus californicus and Typha dominguensis in the reduction of wastewater COD under laboratory conditions

Masias-Flores S.M.; Granada-Cruz G.O.; Vera-Marmanillo V.I. · Revista Internacional de Contaminacion Ambiental (2025) · DOI: 10.20937/rica.55026

Resumen

Wastewater constitutes one of the main environmental problems in Cusco, Peru, considerably altering the quality of water resources, primarily due to organic matter being the primary contaminant. Due to the inability of companies providing sanitation services to reach the entire population, the insufficient treatment of these effluents highlights the need to adopt clean and efficient technologies that use bioagents, known for their highly effective capacity to degrade pollutants. This study evaluates the reduction of chemical oxygen demand (COD) through the action of rhizobacteria from Scirpus californicus and Typha dominguensis in urban wastewater. These bacteria were extracted from the rhizosphere of both reed species from the Lucre-Huacarpay wetland and were grown separately in wastewater from the San Jerónimo-Cusco Wastewater Treatment Plant (WWTP), obtained after the screening. The study evaluated three variables: dose (1% v/v and 2% v/v), incubation time (3 and 5 days) and temperature (20 ºC and 30 ºC). The results revealed a COD reduction between 15% and 51% with Typha dominguensis rhizobacteria and 18% and 49.58% with Scirpus californicus. The most significant COD reduction values were observed with a dose of 1% (v/v) during five days of incubation at 20 ºC. In conclusion, the isolated rhizobacteria demonstrated considerable COD removal, and their integration into a wastewater treatment system is recommended as a key component.

Instituciones: Universidad Nacional de San Antonio Abad del Cusco; Universidad Andina del Cusco