Primary Secondary And Tertiary Treatment Of Wastewater Pdf

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primary secondary and tertiary treatment of wastewater pdf

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17.3B: Wastewater and Sewage Treatment

Sewage treatment is the process of removing contaminants from municipal wastewater , containing mainly household sewage plus some industrial wastewater. Physical, chemical, and biological processes are used to remove contaminants and produce treated wastewater or treated effluent that is safe enough for release into the environment. A by-product of sewage treatment is a semi-solid waste or slurry, called sewage sludge. The sludge has to undergo further treatment before being suitable for disposal or application to land. Sewage treatment may also be referred to as wastewater treatment.

Treatment Steps

When wastewater arrives at the treatment plant, it contains many solids that cannot be removed by the wastewater treatment process. This can include rags, paper, wood, food particles, egg shells, plastic, and even toys and money. To remove these solids, the wastewater enters a building called the Headworks and passes through large screen filters which removed this material. The solids are then placed in a dumpster and taken to the landfill. This is the only byproduct of wastewater treatment that is not recycled! From the Headworks, the wastewater flows into two huge circular tanks called Primary Clarifiers.

Primary treatment removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation. Screens are made of long, closely spaced, narrow metal bars. They block floating debris such as wood , rags, and other bulky objects that could clog pipes or pumps. In modern plants the screens are cleaned mechanically, and the material is promptly disposed of by burial on the plant grounds. A comminutor may be used to grind and shred debris that passes through the screens.


traditional primary and secondary stage treatments with or without disinfection. Currently, the effects of tertiary wastewater treatment processes.


Primary, Secondary, & Tertiary Treatment

Tertiary treatment is the final cleaning process that improves wastewater quality before it is reused, recycled or discharged to the environment. The treatment removes remaining inorganic compounds , and substances, such as the nitrogen and phosphorus. Bacteria, viruses and parasites, which are harmful to public health, are also removed at this stage. Wastewater flows from the biological reactor and IDAL to a pumping station and meet in the flash mixer. Alum is used to help remove additional phosphorus particles and group the remaining solids together for easy removal in the filters.

Secondary Wastewater Treatment

Jun 27, Bloganica. In fact, there are three distinct steps involved in traditional wastewater treatment methods. Primary treatment of wastewater involves sedimentation of solid waste within the water. This is done after filtering out larger contaminants within the water. Wastewater is passed through several tanks and filters that separate water from contaminants.

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5 Comments

  1. Luana S. 19.05.2021 at 09:31

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  2. Laureano Q. 19.05.2021 at 14:15

    WASTE WATER TREATMENT MANUALS. PRIMARY, SECONDARY and TERTIARY TREATMENT. Published by the Environmental Protection Agency, Ireland.

  3. Porter T. 21.05.2021 at 23:41

    Wastewater treatment is an extremely important part of making sure that humans treat the earth with respect.

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  5. Benjamin W. 25.05.2021 at 11:55

    Wastewater is treated in 3 phases: primary solid removal , secondary bacterial decomposition , and tertiary extra filtration.