Shifts in Microbial Community and Its Correlation with Degradative Efficiency in a Wastewater Treatment Plant

Abstract

A wastewater treatment plant controls the level of pollution reaching the environment. Yet, despite being the most common aerobic route for treatment of wastewater, the activated sludge process is not utilized to its full potential. This is mainly due to the lack of knowledge base correlating the microbial community in the activated sludge to its degradative performance. In this study, the activated biomass at the treatment site was monitored for five consecutive months. Even though operational parameters were kept constant, the microbial community was observed to change after 3 months. This shift was seen to correlate with 25 % loss of degradative efficiency. Target oxygenases were monitored at two time points, and results indicated that the dominating pathway operating in the common effluent treatment plant (CETP) is the degradation of chlorinated aromatics. This study demonstrates the change in degradative efficiency in a CETP with the change in microbial community and analyzes the parameters influencing the microbial community of activated sludge.

Detection of Androgenic-Mutagenic Compounds and Potential Autochthonous Bacterial Communities during In Situ Bioremediation of Post-methanated Distillery Sludge

“…Rapid community fingerprinting by the polymerase chain reaction (PCR)-based denaturing gradient electrophoresis (DGGE) of 16S rDNA also indicated highly structured bacterial communities growing in treatment plants and different classes of bacteria were detected (γ -Proteobacteria, Firmicutes , etc. ; Kapley et al, 2015). Some gene probes have also been used as a tool to detect the degradation of phenolic compounds in wastewater treatment systems (Purohit et al, 2003).…”

A eficiência no tratamento de efluente em indústria de balas com a modificação do lodo em reator anaeróbio

“…A carga poluidora gerada nos processos industriais tem-se mostrado como um dos maiores poluidores ambientais. Sendo assim, para Imamura, Toni e Dorta (2012), Kapley et al (2015), a caracterização dos efluentes industriais é necessária para determinar as características biodegradáveis deste efluente antes da sua disposição final no ambiente, com o intuito de preservação ambiental, com a diminuição do impacto negativo.…”

“…Esses processos industriais, conforme Imamura, Toni e Dorta (2012) e Kapley et al (2015), geram diferentes tipos de resíduos que geralmente são descartados de forma irregular, ocasionando a poluição das águas, a contaminação do solo e de toda a fauna e a flora, o que desrespeita, por sua vez, as leis de proteção ao meio ambiente.…”