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

Knisz, Judit; Shetty, Prateek; Wirth, Roland; Maróti, Gergely; Karches, Tamás; Dalkó, I.; Bálint, Miklós; Vadkerti, Edit; Bíró, Tibor

doi:10.1016/j.scitotenv.2020.144425

Cited by 9 publications

(3 citation statements)

References 57 publications

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“…Developed countries mainly use the centralised wastewater treatment system along with onsite wastewater treatment. While around 75% of the population in the European Union is connected to the centralised public sewage system, 10% population in Canada, 12% in Australia and 15% in Germany use onsite wastewater treatment systems [35]. Developing countries either use the decentralised wastewater treatment system or do not treat wastewater at all [33].…”

Section: Wastewater Treatment: Developed Vs Developing Countriesmentioning

confidence: 99%

Natural Treatment Systems and Importance of Social Cost Benefit Analysis in Developing Countries: A Critical Review

Hasan

Iqbal

2022

Sustainability

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This review article attempts to analyse the social issues that impact the performance of natural treatment systems (NTSs). An NTS is a decentralised wastewater treatment system found to be appropriate in developing countries due to its affordability and lower technicity. However, if socio-economic and institutional issues of community are ignored then NTSs may turn out to be unsuitable for developing countries. The article also takes a critical view on the extant literature which ignores the social cost of NTSs. The social cost of NTSs may be high as a decentralised system requires the engagement of various governmental agencies, research institutes and the community. The cost of engagement may make NTSs a socio-economically unattractive proposition. The article discusses the variables to be considered for the social cost-benefit analysis. It also discusses the implications of social cost-benefit analysis for appreciating the incentives and net benefits for collective actions at the community level. Social cost-benefit analysis can help overcome the initial difficulty of high financial cost and usher sustainability.

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Section: Wastewater Treatment: Developed Vs Developing Countriesmentioning

confidence: 99%

Natural Treatment Systems and Importance of Social Cost Benefit Analysis in Developing Countries: A Critical Review

Hasan

Iqbal

2022

Sustainability

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“…17 After treatment with activated sludge and storage in sealed tanks for one week, the concentration levels of polycyclic aromatic hydrocarbons (tens of ng L −1 ) and diethyltoluamide (3.5 μg L −1 ) hardly changed. 18 In contrast, MPs underwent photolysis during storage under sunlit conditions. Photodegradation, as an abiotic process, may have an important effect on the persistence of MPs.…”

Section: Introductionmentioning

confidence: 99%

Essential role of sunlight irradiation in aqueous micropollutant transformations: influence of the water matrix and changes in toxicities

Huang

Liang

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…Depth has also been considered as a contributor to the microbial community structure (Truu et al, 2009). Effluent storage has shown to cause reductions in microbial diversity as high nutrient contents are gradually degraded (Knisz et al, 2021) with comparisons of the effluent from multiple on-site systems showing the effect of treatment technologies and seasonality on the structure of nitrifying and denitrifying communities (Ross et al, 2020). Crucially, studies have reported that, in contrast to centralized wastewater treatment plants (WWTPs), OWTSs appear to be highly influenced by the inoculation of soil organisms during installation and maintenance (Wigginton et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Spatial Variation of the Microbial Community Structure of On-Site Soil Treatment Units in a Temperate Climate, and the Role of Pre-treatment of Domestic Effluent in the Development of the Biomat Community

et al. 2022

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The growth of microbial mats or “biomats” has been identified as an essential component in the attenuation of pollutants within the soil treatment unit (STU) of conventional on-site wastewater treatment systems (OWTSs). This study aimed to characterize the microbial community which colonizes these niches and to determine the influence of the pre-treatment of raw-domestic wastewater on these communities. This was achieved through a detailed sampling campaign of two OWTSs. At each site, the STU areas were split whereby half received effluent directly from septic tanks, and half received more highly treated effluents from packaged aerobic treatment systems [a coconut husk media filter on one site, and a rotating biodisc contactor (RBC) on the other site]. Effluents from the RBC had a higher level of pre-treatment [~90% Total Organic Carbon (TOC) removal], compared to the media filter (~60% TOC removal). A total of 92 samples were obtained from both STU locations and characterized by 16S rRNA gene sequencing analysis. The fully treated effluent from the RBC resulted in greater microbial community richness and diversity within the STUs compared to the STUs receiving partially treated effluents. The microbial community structure found within the STU receiving fully treated effluents was significantly different from its septic tank, primary effluent counterpart. Moreover, the distance along each STU appears to have a greater impact on the community structure than the depth in each STU. Our findings highlight the spatial variability of diversity, Phylum- and Genus-level taxa, and functional groups within the STUs, which supports the assumption that specialized biomes develop around the application of effluents under different degrees of treatment and distance from the source. This research indicates that the application of pre-treated effluents infers significant changes in the microbial community structure, which in turn has important implications for the functionality of the STU, and consequently the potential risks to public health and the environment.

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

Cited by 9 publications

References 57 publications

Natural Treatment Systems and Importance of Social Cost Benefit Analysis in Developing Countries: A Critical Review

Natural Treatment Systems and Importance of Social Cost Benefit Analysis in Developing Countries: A Critical Review

Essential role of sunlight irradiation in aqueous micropollutant transformations: influence of the water matrix and changes in toxicities

Spatial Variation of the Microbial Community Structure of On-Site Soil Treatment Units in a Temperate Climate, and the Role of Pre-treatment of Domestic Effluent in the Development of the Biomat Community

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