Septic tank
Storyboard
A septic tank is an on-site wastewater treatment system used in areas without centralized sewer systems. It consists of a buried container made of concrete, fiberglass, or plastic, designed to receive, treat, and partially treat household wastewater. The tank operates as a two-chamber system, separating solids and scum from the wastewater. In the first chamber, larger solids settle to the bottom, forming sludge, while lighter materials float to the top as scum. The first chamber functions as an anaerobic zone, breaking down organic matter. The partially treated effluent then flows to the second chamber for further settling and biological treatment. This process helps remove more solids and pathogens, improving the quality of the effluent before it leaves the septic tank.
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Working Principle of Septic Tank
Description
A septic tank is a common on-site wastewater treatment system used in areas without access to a centralized sewer system. It is a buried, watertight container made of concrete, fiberglass, or plastic, designed to receive, treat, and partially treat household wastewater. The septic tank is an essential component of the septic system, which also includes pipes, drain fields, and the surrounding soil.
The septic tank operates as a two-chamber system, allowing for the separation of solids and scum from the wastewater. In the first chamber, the wastewater undergoes primary treatment. Larger solids settle to the bottom, forming a layer of sludge, while lighter materials like grease and oils float to the top, creating a scum layer. This separation process reduces the organic load in the effluent, making it easier for the next chamber to further treat the wastewater.
To prevent the scum and settled sludge from directly moving into the second chamber, a dividing wall (baffle) is in place. This ensures that the partially treated effluent from the first chamber flows into the second chamber for further treatment.
The first chamber acts as an anaerobic zone where the solids decompose in the absence of oxygen. The anaerobic digestion process breaks down organic matter into simpler compounds, reducing the overall pollutant load in the wastewater.
In the second chamber, further settling and biological treatment occur. The settled effluent from the first chamber flows through the baffle into the second chamber, where additional microbial action takes place. This secondary treatment stage helps remove more suspended solids and pathogens, thus improving the quality of the effluent before it eventually leaves the septic tank.
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2500-liter septic tank
Description
For this project, a 2500-liter septic tank will be installed, using the KITFSH2500 model from BioPlastic:
BioPlastic KITFSH2500 septic tank
The tank features the following specified dimensions:
Septic tank dimensions
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Septic tank transport
Description
The septic tank was purchased and transported via barge:
Septic tank being transported by barge from Niebla
It was then placed near the house, where it will remain until installation scheduled for the following week:
Septic tank in Palos Verdes, ready for installation
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Septic tank installation
Description
The septic tank is placed at the base of the house, allowing blackwater to flow by gravity:
Septic tank location
A hole is excavated to the depth of the tank, ensuring the pipe reaches the inlet point with a slope angle of 2% to 4%:
Excavation for installation
The tank is buried, leaving only the access hatch visible:
Buried tank with access hatch
Next, it is connected to the pipe from the inspection chamber, which collects both blackwater and greywater:
Connection to the inspection chamber
The tank is then connected to the pipe leading to the drainage area:
Connection to the drainage area
Finally, efforts are made to cover the tank as much as possible, incorporating it into the garden's structure:
Final covering of the septic tank
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