7 Significant Steps to a Successful Sewage Treatment Procedure
After flushing your wastes in your toilet or draining them in your kitchen drains, where do you think will they go? Are they gone for good? Most of us do not know is the destinations of our wastewater and where they are usually taken. These sewages are to be transported to a sewage treatment plant where they will be treated before discharging them into a body of water or using them as fertilisers. Let me tell you about the processes undergone by sewages after they leave our homes.
1. Taking the waste water out
Upon flushing your toilet or draining your kitchen sink, the wastewater would travel down your sewer laterals until it reaches the residential sewer pipe commonly located underneath the roads or pavements. They would be conveyed from one sewer unto the other until it reaches the main sewer line and into the sewage treatment plant. They will then be pumped by your treatment plants and they would have to undergo varied cleaning procedures before discharging them.
The initial step towards the wastewater cleaning procedure is the screening where the wastewater is sifted to get rid of large particles or items before entering the treatment plant as this debris can cause obstructions and troubles to your mechanism. Some of the items to be removed during screening are face wipes, toiletries, cotton buds, cigarette butts, napkins and sanitary items. Bottles, bricks and rags might be present in the wastewater as well so they would have to be removed.
Shingle, gravel, stones and pebbles may be present as well. And when they do, you don’t have to worry on how to remove them because there is a mechanism that could sort them out from the wastewater before entering the treatment plant.
3. Primary treatment
After screening the wastewater, wastewater couldn’t be removed making them stay in the wastewater. This treatment now would remove the human waste and separate them from the water. This is done by placing them together in a huge settlement container where the human waste and some solid particles not removed during screening are allowed to settle at the bottom. This time, they are already called sludge. The scrapers will then rotate to the shove the sludge into the centre and pump them out for some other treatments. The water that is now free from sludge will pass through the top portion of the container and would undergo its own cleaning process.
4. Secondary treatment
This treatment is performed to ensure that even the smallest particles or debris are sorted out from the water. The water will be placed into a rectangular-shaped container which contains good bacteria in it. The good bacteria will then eat the bugs and the wastewater will then be pumped.
5. Final treatment
Final treatment is to make sure that no sludge remains in the water. This is for the wastewater return sensitive rivers. The wastewater will be placed in its final settlement tank with good bacteria at the bottom. The sludge will either be returned to the second stage or be allowed to flow to the sludge treatment tank.
6. Sludge treatment
Most sludge are recycled and treated because they make good fertilisers for farms or vegetation. Aside from that, they can also be used to produce energy.
There are three ways to treat sludge. They are the combined heat and power, thermal destruction and gas to grid.
7. Treated water discharge
After all the treatment stage, the sludge will then be used as fertilisers while the water will be brought back to rivers and local streams. Some agencies will check the treated to know if they are safe and suitable to be discharged to the river and streams.