What are the 5 stages of wastewater treatment?

Treatment Steps

• Step 1: Screening and Pumping.
• Step 2: Grit Removal.
• Step 3: Primary Settling.
• Step 4: Aeration / Activated Sludge.
• Step 5: Secondary Settling.
• Step 6: Filtration.
• Step 7: Disinfection.
• Step 8: Oxygen Uptake.

What are the steps in wastewater treatment?

The Wastewater Treatment Process

1. Stage One — Bar Screening.
2. Stage Two — Screening.
3. Stage Three — Primary Clarifier.
4. Stage Four — Aeration.
5. Stage Five — Secondary Clarifier.
6. Stage Six — Chlorination (Disinfection)
7. Stage Seven — Water Analysis & Testing.
8. Stage Eight — Effluent Disposal.

What are the 4 stages required in the treatment of wastewater?

Four common ways to treat wastewater include physical water treatment, biological water treatment, chemical treatment, and sludge treatment. Let us learn about these processes in detail. In this stage, physical methods are used for cleaning the wastewater.

How does a wastewater treatment plant work?

The wastewater enters an aeration tank, where it is mixed with sludge. Air is then pumped into the aeration tank to facilitate the growth of bacteria and other small organisms within the sludge. The bacteria and other microorganisms break down the organic matter in the water into harmless byproducts.

What is primary wastewater treatment?

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. The shredded material is removed later by sedimentation or flotation processes.

How much does a wastewater treatment plant cost?

The bottom line. When it comes to treating your wastewater, even though the treatment option and costs can be complex, all in all, you are looking at a $500,000 to $1.5 million system at 150,000 GPD when you factor in all the needed equipment, engineering, design, installation, and startup.

Do we drink wastewater?

In fact, some southern Californians already have been drinking recycled wastewater for years, thanks to a pilot project in Orange County. Southern California depends entirely on Northern California and the increasingly strained Colorado River to hydrate its lands and 24 million inhabitants.

What is denitrification in wastewater treatment?

In the context of wastewater treatment, the United Nations Environment Programme explained: Denitrification is the process whereby nitrogen is removed from water. When employed in water quality improvement technologies, denitrification treats water to reduce its nitrate-nitrogen content to potable levels.

What happens to wastewater after treatment?

What happens to the treated water when it leaves the wastewater treatment plant? The treated wastewater is released into local waterways where it’s used again for any number of purposes, such as supplying drinking water, irrigating crops, and sustaining aquatic life.

What are the 3 types of sewage treatment?

Sewage treatment is done in three stages: primary, secondary and tertiary treatment.

How does a wastewater treatment plant get to your home?

The wastewater system relies on the force of gravity to move sewage from your home to the treatment plant. So wastewater-treatment plants are located on low ground, often near a river into which treated water can be released. If the plant is built above the ground level, the wastewater has to be pumped up to the aeration tanks (item 3).

How does primary treatment work in a sewage treatment plant?

Primary Treatment. As sewage enters a plant for treatment, it flows through a screen, which removes large floating objects such as rags and sticks that might clog pipes or damage equipment. After sewage has been screened, it passes into a grit chamber, where cinders, sand, and small stones settle to the bottom.

Where does the sludge go in a wastewater treatment plant?

Wastewater then enters the second section or sedimentation tanks. Here, the sludge (the organic portion of the sewage) settles out of the wastewater and is pumped out of the tanks. Some of the water is removed in a step called thickening and then the sludge is processed in large tanks called digesters.

How does aeration work in a wastewater treatment plant?

As organic matter decays, it uses up oxygen. Aeration replenishes the oxygen. Bubbling oxygen through the water also keeps the organic material suspended while it forces ‘grit’ (coffee grounds, sand and other small, dense particles) to settle out. Grit is pumped out of the tanks and taken to landfills. 4. Removing sludge