1. Historical review of wastewater treatment

2. Working principle of a wastewater treatment plant

3. Treatment steps of wastewater treatment plant

4. Secondary treatment

5. Tertiary treatment

6. Collaborate with professionals


Municipal wastewater treatment plants extract wastewater from sewers and private septic tank systems and ensure that it is clean and free of pollutants. Once the EPA standards are met, wastewater will be discharged into water bodies or returned to the public drinking water supply system. Have you ever wondered what led to the creation of a well-designed wastewater treatment plant? Due to technological progress and scientific breakthroughs, the treatment steps of wastewater treatment plants has made considerable progress from the beginning.

Historical review of wastewater treatment

Go back to ancient Rome. It has one of the earliest wastewater treatment systems. Rainwater will flow from the streets and roofs to several drainage paths, resulting in a larger cloaca runoff directly to the Tiber. Although this is a good way to prevent the streets from being flooded, there are still problems. At first, people threw the garbage from the windows of their homes on the street so that they could be washed away with water. When toilets and bathrooms became commonplace, pipes entered waste water pits, and over time, the waste water seeped underground or flowed into gardens and cellars. In cities and big cities, septic tanks are impossible due to lack of space. Instead, the pipes from the wastewater pond are connected to the sewer and sewer, and the waste eventually flows into the river. This has caused water pollution and increased cases of bacterial diseases such as cholera. It was not until the late 1800s and early 1900s that cities in the United States and Britain considered how to prevent water pollution caused by wastewater. The first change is the creation of a well-designed wastewater treatment plant system. The working principle of a wastewater treatment plant is to use chemicals and biological treatment schemes to treat water before it is discharged into lakes, streams and rivers.

wastewater treatment plant

Working principle of a wastewater treatment plant

The working principle of a wastewater treatment plant is that wastewater enters, foreign matter and solids are removed, the remaining water is aerated and clarified, microorganisms digest any tiny waste particles, and chemical additives kill any remaining things. Ultraviolet rays are the last step and help remove the added chemicals. You have a combined system that mixes wastewater with rainwater and takes it into a well-designed wastewater treatment plant system for treatment. A separate system is more common. All new wastewater treatment systems are separated from rainwater. Rainwater will return to streams or rivers, and waste water will enter the treatment plant for treatment.

Treatment steps of wastewater treatment plant

When wastewater reaches the wastewater treatment plant from the sewer, it may need to be pumped from a lower altitude to a higher altitude for primary treatment. You can use an open pump or a closed screw pump to transport the wastewater to the sedimentation tank. The wastewater will first pass through the screen and enter the grit tank to remove contaminants such as plastic applicators, plastic wrappers or coffee grounds and other grit. Removal of sand particles is important to maintain the service life of the equipment. Over time, sand and gravel will wear out parts. If the grit is removed, the service life of the pump and valve can be prolonged. You can also prevent clogging. As the treatment steps of wastewater treatment plants continue, this facilitates aeration and digestion. When wastewater is pumped to the next area of a well-designed wastewater treatment plant system, the pump needs to be able to handle different flow rates. In the morning when people are preparing to go to school and work, the flow rate of the sewer seems to be higher, and in the evening when people go home to prepare for the day, the flow rate of the sewer seems to be higher. When people sleep, the flow rate will slow down.

Secondary treatment

In the working principle of a wastewater treatment plant, the primary clarifier is to settle the sludge to the bottom. The liquid (primary effluent) flows to the aeration tank so that the liquid is stirred and oxygenated. The sludge is pumped out to the place where it will be treated and disposed of. It does not remove all the tiny sludge particles. In the aeration tank, the water is mixed to produce oxygen that the microorganisms depend on. Microorganisms maintain their vitality under the action of oxygen and feed on the remaining organic matter. Before moving to the secondary clarifier, some treatment steps of wastewater treatment plants also use filters to help remove impurities. Activated sludge treatment is another option before secondary clarification. Once again, the sludge settles, some are pumped out, and some are returned to the aeration tank for the second round, and the clean water continues to undergo tertiary treatment.

 wastewater treatment plant

Tertiary treatment

The tertiary treatment may include a biological treatment solution. The working principle of a wastewater treatment plant involves adding disinfectants to the water to help kill any remaining contaminants. Just as they used chlorine in the past, many plants still use it to ensure that they kill bacteria. The remaining water is then exposed to ultraviolet light to help remove the chlorine that is normally used to help disinfect water. Test the water to ensure that the clean water meets EPA standards. In order to best manage the biological treatment system, many wastewater treatment plants use supervisory control and data acquisition systems in their treatment steps. This helps to control and monitor all the different equipment in the wastewater treatment plant. It will notify the operator of potential problems and allow remote monitoring. In addition, please consider adding Sharp Bio-Nutrient Remover to a well-designed wastewater treatment plant system. This is a process control system that ensures that you reach your treatment goals while minimizing energy consumption.

Collaborate with professionals

Any municipal wastewater treatment zone must strive to ensure that the water meets the guidelines while making it affordable for the members of the water district. If taxpayers cannot afford this fee, this may become a problem. You also don’t want to have a wastewater treatment plant that cannot meet the growing demand as more houses and businesses are built in the area. With a well-designed wastewater treatment plant that takes into account growth, energy efficiency,  you will do well.

It takes a lot of work to purify urban wastewater. You want to work with wastewater treatment equipment and design experts. When you work with us, we will assign engineers and other experts to help you design a wastewater treatment plant from the ground up or assist you in making improvements to help you increase efficiency and cost-effectiveness. Call us to discuss your project.

Tags: working principle of a wastewater treatment plant, Treatment steps of wastewater treatment plant, well-designed wastewater treatment plant

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