Effect of turbulence, dispersion, and stratification on Escherichia coli disinfection in a subtropical maturation pond

Dahl, N. W.; Woodfield, Peter; Simpson, B A F; Stratton, Helen; Lemckert, Charles James

doi:10.1016/j.jenvman.2021.112470

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…Winter radiation is less intense and results in cooler temperatures with less evapotranspiration. Other variables that affect the process are humidity and precipitation [61,62], in addition to other parameters such as pH, dissolved oxygen (DO), depth or stratification [63][64][65][66][67].…”

Section: Constructed Wetlands and Lagoonsmentioning

confidence: 99%

Climate Change Mitigation Tool Implemented through an Integrated and Resilient System to Measure and Monitor Operating Variables, Applied to Natural Wastewater Treatment Systems (NTSW) in Livestock Farms

Rodríguez-Pérez

Mendieta-Pino

Brito-Espino

et al. 2022

Water

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In this study, the main elements that can make up a Natural Treatment System for Wastewater (NTSW), its most important parameters and properties of operation and design, have been analyzed, as well as the environmental problems derived from the generation of large amounts of slurry. The objective of this paper is to propose a methodology to improve the operation of these systems, associated with small and medium-sized livestock farms, in insular and isolated systems such as the Canary Islands. An Integrated and Resilient System (IRS) for monitoring and measuring operational variables quasi-continuous and in situ is proposed. Low-cost technology and open source hardware are employed, as well as application of the IoT (Internet of Things) strategies to share and analyze the information collected in the cloud. In view of the high degree of resilience and the simplicity of this type of technology, as well as its low cost, it is concluded that it is feasible to create a measurement system with these characteristics that can be used for NTSW parameterization, and other purposes. Satisfactory results were obtained for several parameters (ambient temperature, relative humidity, UV radiation, atmospheric pressure). It is presented as a novel proposal based mainly on low-cost technology and free software with which to improve the NTSW operation process.

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Section: Constructed Wetlands and Lagoonsmentioning

confidence: 99%

Climate Change Mitigation Tool Implemented through an Integrated and Resilient System to Measure and Monitor Operating Variables, Applied to Natural Wastewater Treatment Systems (NTSW) in Livestock Farms

Rodríguez-Pérez

Mendieta-Pino

Brito-Espino

et al. 2022

Water

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“…The installation of baffles-solid partitions to confine or direct flow-is a solution to improve pond hydraulics, with laboratory experiments, computer modelling, and operational-scale studies all having shown the advantage of baffles in WSPs for improving hydraulic and treatment performance [7][8][9]. However, the majority of the research to date has either simply explored the impact of baffles on pond hydraulic performance or assumed that only suspended biomass is responsible for nutrient removal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Attached Growth on Treatment Performance in Waste Stabilization Ponds

Lian

Coggins

Hay

et al. 2022

Water

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Waste stabilization ponds (WSPs) rely upon natural biochemical reactions for treatment and are used widely across the world. However, WSPs often fail to meet treatment performance expectations due to insufficient hydraulic performance. Installation of baffles can improve hydraulic performance of WSPs by increasing the mean residence time, reducing dead zones, and short circuiting, thus improving pond treatment performance. Theoretically, baffles with the ability to sustain attached growth will increase the possible attachment area of microorganisms and further contribute to nutrient removal. However, to date there have been no full-scale studies exploring attached growth baffles in WSPs. The main objective of this study was to investigate and quantify the effect of attached growth baffles on WSP treatment performance, specifically in terms of improvements in treatment performance provided by attached biofilm compared with hydraulic improvement. A first-order kinetic model was used to predict biological oxygen demand (BOD) removal efficiency, including suspended and biofilm biomass reactions, to determine whether attached growth or hydraulics had the most influence on performance improvement. At the operational WSP scale, we found that although the presence of attached growth on baffles results in a modest (~0.6%) improvement in treatment performance, the most influential factor for improving treatment was improved hydraulics (~5.3%). In model generalization, the change in biofilm thickness and biofilm area had less effect on treatment in WSPs in higher organic loading scenarios; however, a considerable improvement (~12%) in treatment efficiency could be achieved by doubling the total biofilm area. Overall, this study shows that baffles can not only improve WSP hydraulics but can also be used as a medium for increasing biofilm area to improve WSP biological treatment efficiency.

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Wastewater Pollution in Urban Canals of Vietnam: Restoration Using Nature-Based Solutions

Dang

Trang

Thao

et al. 2022

Applied Environmental Science and Engineering for a Sustainable Future

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Effect of turbulence, dispersion, and stratification on Escherichia coli disinfection in a subtropical maturation pond

Cited by 6 publications

References 22 publications

Climate Change Mitigation Tool Implemented through an Integrated and Resilient System to Measure and Monitor Operating Variables, Applied to Natural Wastewater Treatment Systems (NTSW) in Livestock Farms

Climate Change Mitigation Tool Implemented through an Integrated and Resilient System to Measure and Monitor Operating Variables, Applied to Natural Wastewater Treatment Systems (NTSW) in Livestock Farms

Effect of Attached Growth on Treatment Performance in Waste Stabilization Ponds

Wastewater Pollution in Urban Canals of Vietnam: Restoration Using Nature-Based Solutions

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