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From the moment insecticide reaches the aquifer from the drain field, calculate the advective travel time to the neighbour's water well. Septic systems are one of the most common sources of groundwater contamination in rural areas. They are designed to treat sewage effluent from homes and then release the treated water to underlying aquifers. When working correctly, they promote biodegradation of organic wastes and kill harmful pathogens, but the treated water is not pristine. When working correctly, septic systems are significant sources of NO3, Cl- and PO4³- to the groundwater system (and anything else that home owners put down the drain). well groundwater table house sewer pipe Septic Tank access risers discharge to absorption trench or filter bed scum inlet baffle compartment 1 compartment 2 heavy_ solids final distribution pre- treatment treatment zone percolation saturated soil vel 3.17 x 10-6 m/s bedrock deep aquifer https://www.ontario.ca/files/2022-10/omafra-septic-smart-understanding-home-wastewater-system-en-2022-10-14.pdf effluent filter fine particles 1. Sewage from the house is pre-treated anaerobically in the septic tank. 2. The effluent flows to a drain field with perforated pipes, allowing it to drain downward. Micro-organisms utilize O2 in the vadose zone to provide additional aerobic treatment. The scenario represented by the Figure above, with a water well and septic system, is common to all homes in rural Canada that are not connected to a municipal sewer system. When installing these systems, one of the primary concerns is that groundwater should flow from the drain field and away from the well. It is best if the well is screened in a deeper confined aquifer that is not impacted from septic drainage, but this is not always possible. So, it is common that septic-tank effluent drains into the same unconfined aquifer that provides drinking water via the well. Let's assume that water impacted by the drain field flows away from the well, as shown in the figure, but people have neighbours, so here we will assume there is a neighbour, with a water well, 100 m downgradient. Not understanding the connection between the house drains and the aquifer, the homeowner flushes some old garden insecticide down the toilet, which moves conservatively through the septic tank and enters the aquifer from the drain field. It then travels along the 100 m flow path to the neighbour's well. Also assume: - - homogeneous and isotropic distribution of K one-dimensional flow path

From the moment insecticide reaches the aquifer from the drain field, calculate the advective travel time to the neighbour's water well. Septic systems are one of the most common sources of groundwater contamination in rural areas. They are designed to treat sewage effluent from homes and then release the treated water to underlying aquifers. When working correctly, they promote biodegradation of organic wastes and kill harmful pathogens, but the treated water is not pristine. When working correctly, septic systems are significant sources of NO3, Cl- and PO4³- to the groundwater system (and anything else that home owners put down the drain). well groundwater table house sewer pipe Septic Tank access risers discharge to absorption trench or filter bed scum inlet baffle compartment 1 compartment 2 heavy_ solids final distribution pre- treatment treatment zone percolation saturated soil vel 3.17 x 10-6 m/s bedrock deep aquifer https://www.ontario.ca/files/2022-10/omafra-septic-smart-understanding-home-wastewater-system-en-2022-10-14.pdf effluent filter fine particles 1. Sewage from the house is pre-treated anaerobically in the septic tank. 2. The effluent flows to a drain field with perforated pipes, allowing it to drain downward. Micro-organisms utilize O2 in the vadose zone to provide additional aerobic treatment. The scenario represented by the Figure above, with a water well and septic system, is common to all homes in rural Canada that are not connected to a municipal sewer system. When installing these systems, one of the primary concerns is that groundwater should flow from the drain field and away from the well. It is best if the well is screened in a deeper confined aquifer that is not impacted from septic drainage, but this is not always possible. So, it is common that septic-tank effluent drains into the same unconfined aquifer that provides drinking water via the well. Let's assume that water impacted by the drain field flows away from the well, as shown in the figure, but people have neighbours, so here we will assume there is a neighbour, with a water well, 100 m downgradient. Not understanding the connection between the house drains and the aquifer, the homeowner flushes some old garden insecticide down the toilet, which moves conservatively through the septic tank and enters the aquifer from the drain field. It then travels along the 100 m flow path to the neighbour's well. Also assume: - - homogeneous and isotropic distribution of K one-dimensional flow path

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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From the moment insecticide reaches the aquifer from the drain field, calculate the advective travel time to the neighbour's water well.
Transcribed Image Text:From the moment insecticide reaches the aquifer from the drain field, calculate the advective travel time to the neighbour's water well.
Septic systems are one of the most common sources of groundwater contamination in rural areas. They are designed to treat sewage effluent from homes and then release the treated water to underlying aquifers. When working correctly, they promote biodegradation of organic wastes and kill harmful pathogens, but the treated water is not pristine. When working correctly, septic systems are significant sources of NO3, Cl- and PO4³- to the groundwater system (and anything else that home owners put down the drain). well groundwater table house sewer pipe Septic Tank access risers discharge to absorption trench or filter bed scum inlet baffle compartment 1 compartment 2 heavy_ solids final distribution pre- treatment treatment zone percolation saturated soil vel 3.17 x 10-6 m/s bedrock deep aquifer https://www.ontario.ca/files/2022-10/omafra-septic-smart-understanding-home-wastewater-system-en-2022-10-14.pdf effluent filter fine particles 1. Sewage from the house is pre-treated anaerobically in the septic tank. 2. The effluent flows to a drain field with perforated pipes, allowing it to drain downward. Micro-organisms utilize O2 in the vadose zone to provide additional aerobic treatment. The scenario represented by the Figure above, with a water well and septic system, is common to all homes in rural Canada that are not connected to a municipal sewer system. When installing these systems, one of the primary concerns is that groundwater should flow from the drain field and away from the well. It is best if the well is screened in a deeper confined aquifer that is not impacted from septic drainage, but this is not always possible. So, it is common that septic-tank effluent drains into the same unconfined aquifer that provides drinking water via the well. Let's assume that water impacted by the drain field flows away from the well, as shown in the figure, but people have neighbours, so here we will assume there is a neighbour, with a water well, 100 m downgradient. Not understanding the connection between the house drains and the aquifer, the homeowner flushes some old garden insecticide down the toilet, which moves conservatively through the septic tank and enters the aquifer from the drain field. It then travels along the 100 m flow path to the neighbour's well. Also assume: - - homogeneous and isotropic distribution of K one-dimensional flow path
Transcribed Image Text:Septic systems are one of the most common sources of groundwater contamination in rural areas. They are designed to treat sewage effluent from homes and then release the treated water to underlying aquifers. When working correctly, they promote biodegradation of organic wastes and kill harmful pathogens, but the treated water is not pristine. When working correctly, septic systems are significant sources of NO3, Cl- and PO4³- to the groundwater system (and anything else that home owners put down the drain). well groundwater table house sewer pipe Septic Tank access risers discharge to absorption trench or filter bed scum inlet baffle compartment 1 compartment 2 heavy_ solids final distribution pre- treatment treatment zone percolation saturated soil vel 3.17 x 10-6 m/s bedrock deep aquifer https://www.ontario.ca/files/2022-10/omafra-septic-smart-understanding-home-wastewater-system-en-2022-10-14.pdf effluent filter fine particles 1. Sewage from the house is pre-treated anaerobically in the septic tank. 2. The effluent flows to a drain field with perforated pipes, allowing it to drain downward. Micro-organisms utilize O2 in the vadose zone to provide additional aerobic treatment. The scenario represented by the Figure above, with a water well and septic system, is common to all homes in rural Canada that are not connected to a municipal sewer system. When installing these systems, one of the primary concerns is that groundwater should flow from the drain field and away from the well. It is best if the well is screened in a deeper confined aquifer that is not impacted from septic drainage, but this is not always possible. So, it is common that septic-tank effluent drains into the same unconfined aquifer that provides drinking water via the well. Let's assume that water impacted by the drain field flows away from the well, as shown in the figure, but people have neighbours, so here we will assume there is a neighbour, with a water well, 100 m downgradient. Not understanding the connection between the house drains and the aquifer, the homeowner flushes some old garden insecticide down the toilet, which moves conservatively through the septic tank and enters the aquifer from the drain field. It then travels along the 100 m flow path to the neighbour's well. Also assume: - - homogeneous and isotropic distribution of K one-dimensional flow path
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