After the sewage leaves the settling tank in the primary stage, it is pumped into an aeration tank, where it is mixed with air and sludge loaded with bacteria and allowed to remain for several hours. During this time, the bacteria break down the organic matter into harmless by-products.
How Does Sewage Treatment Work?
Sewage treatment is a process used to remove contaminants from wastewater and household sewage, making it safe for reuse or discharge back into the environment. This process is essential for protecting public health and the environment from the potentially harmful contaminants that are found in sewage. The treatment process is usually divided into three stages: primary, secondary, and tertiary treatment.
Primary treatment is the first stage of sewage treatment, during which wastewater is separated from solid materials. This is done by passing the wastewater through a series of physical screens and settling tanks, where heavy materials such as sand, gravel, and other debris are removed. The remaining wastewater is then passed through a series of screens and other physical processes to remove any remaining solids.
Secondary treatment is the next stage of sewage treatment, during which the wastewater is treated with chemical and biological processes to remove organic contaminants. This includes the addition of bacteria, which breaks down organic matter into simpler compounds. The process also removes any remaining suspended solids, such as particles of grease, oil, and other materials.
Tertiary treatment is the final stage of sewage treatment, during which the wastewater is treated with advanced physical and chemical processes to remove any remaining contaminants. This includes the addition of chemicals such as chlorine and
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