Constructed wetlands (CWs) offer several advantages for treating waters; however, the successful application of these systems remains a challenge. Practical solutions to pollution through CWs remain incipient because wetlands are still studied as "black boxes"; further studies are required regarding the involvement of rhizosphere bacteria in the removal of pollutants. This research focused on increasing the performance of CWs treatment systems for the removal of inorganic and organic pollutants from domestic wastewater, by the application of native bioremediating rhizobacteria. A bacterial consortium (CAD/1S) was designed with four rhizobacteria strains isolated from Typha domingensis plants of natural wetlands. Each individual strain was identified by 16S ribosomal RNA (rRNA) gene sequencing. This consortium removed organic matter, ammonium, and phosphate with percentages over 70% from model wastewater. The evaluation of abiotic and biotic factors' influence on pollutant removal indicated the best conditions to remove pollutants: a neutral pH, a 72-h contact time, and an inoculum from single growth of each strain. The subsequent bioaugmentation with the consortium of CWs at laboratory scale allowed 100%, greater than 70 and 55% removal of organic matter, ammonium, and phosphate, respectively. The set of results allowed the proposal of a new strategy for the improvement of CWs technology for the treatment of domestic wastewater pollutants.
Artículo enviado el 17 de abril de 2017. Aceptado, tras revisión, el 28 de abril de 2017. Publicado el 1 de septiembre de 2017.
ResumenLa antracnosis es considerada la principal enfermedad fúngica que afecta al mango. Causa considerables daños en las hojas, las flores y los frutos. Los hongos filamentosos del género Colletotrichum y su teleomorfo Glomerella son considerados los patógenos de plantas más ampliamente distribuidos a nivel mundial, causantes de esta enfermedad. En esta investigación se obtuvieron 22 aislados del género Colletotrichum de diferentes localidades de la región occidental país, en seis variedades de mango. La caracterización cultural fue diversa en el crecimiento de colonias en PDA, con presencia y ausencia de exudaciones a diferentes temperaturas, siendo los 24 grados la óptima para el crecimiento. La fase sexual observada en algunos aislados muestra pocos peritecios. La concentración de conidios varió entre 107 y 105 medidos Cámara de Neubauer mientras los apresorios y conidios están dentro de los rangos para la especie Colletotrichum gloeosporiodes. La variabilidad en la patogenicidad mostró que todas las especies de mangos investigadas son susceptibles al microorganismo. El análisis estadístico arroja el agrupamiento de los aislados por localidad con características patogénicas similares.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.