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Genome-level insights into the operation of an on-site biological wastewater treatment unit reveal the importance of storage time

Knisz, Judit and Shetty, Prateek and Wirth, Roland and Maróti, Gergely and Karches, Tamás and Dalkó, Ilona and Vadkerti, Edit and Bíró, Tibor (2021) Genome-level insights into the operation of an on-site biological wastewater treatment unit reveal the importance of storage time. SCIENCE OF THE TOTAL ENVIRONMENT, 766. ISSN 0048-9697

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Abstract

On-site wastewater treatment systems are gaining popularity in areas where centralized wastewater treatment is not available. In the current case study a domestic activated sludge system was investigated, where treated effluent was stored in a short-term (1 week turn-over time) and a long-term (over 2–3 months) storage tank and was then used for irrigation. This design provided a unique opportunity to assess the chemical and microbial changes of the effluent upon storage. Long-term storage greatly improved both the chemical quality and the degradation efficiency of most organic micropollutants examined, including petroleum hydrocarbons and the pesticide diethyltoluamide. Taxonomic profile of the core microbiome of the effluent was also influenced upon storage. Relative abundance values of the members of Azoarcus and Thauera genera, which are important in degrading polycyclic aromatic hydrocarbons compounds, clearly indicated the biodegrading activity of these microbes across samples. The abundance of xenobiotics degradation functions correlated with the observed organic micropollutant degradation values indicating efficient microbial decomposition of these contaminants. Functions related to infectious diseases also had the highest abundance in the short-term storage tank corresponding well with the relative abundance of indicator organisms and implying to the significance of storage time in the elimination of pathogens. Based on these results, small, on-site wastewater treatment systems could benefit from long-term storage of wastewater effluent.

Item Type: Article
Uncontrolled Keywords: Activated sludge; organic micropollutants; On-site wastewater treatment; Wastewater microbiome; Functional genomics;
Subjects: Q Science / természettudomány > QK Botany / növénytan
T Technology / alkalmazott, műszaki tudományok > TD Environmental technology. Sanitary engineering / környezetvédelem, hulladékkezelés, egészségügyi mérnöki technika (ivóvízellátási és szennyvízkezelési technika)
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 01 Sep 2021 15:56
Last Modified: 25 Apr 2023 11:17
URI: http://real.mtak.hu/id/eprint/128950

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