How the Inglewood Wastewater Treatment Plant Works
Wastewater from the community flows into the sanitary sewer and into the Wastewater Treatment Plant. The first stage of treatment is the comminutor and screens. This process removes most of the inorganic material such as cotton swabs, rags, large pieces of paper, feminine hygiene products and other large objects. The screen captures this material and it is collected in an external trash bin to be taken to the landfill.
In the second stage, the wastewater is exposed to biological treatment. There are three different tanks that carry out the biological treatment.
- The first tank is an Anaerobic Chamber. Most of the heavier solids are collected on the bottom of the tank along with the waste activated sludge from the third tank in the biological treatment. The anaerobic (work without oxygen) bacteria start to work on digesting the sludge and perform some nutrient removal such as nitrogen and phosphorus. The wastewater then flows into the second tank.
- The second tank is known as the SAM tank (Surge Anoxic Mix). The SAM tank receives its food from the overflow of the anaerobic chamber, and the special bacteria in this tank breaks down the organic portion of the incoming wastewater further before it goes to the final tank.
- The third and final stage of treatment is the SBR tank (Sequence Batch Reactor). Oxygen is needed in this stage to help the specialized aerobic bacteria complete nitrification. Nitrifying bacteria are one of the most important bacteria in this biological process. The Regionís legal binding document with the Ministry of the Environment, has very strict limits on the amount of ammonia that can be discharged into the river. Nitrifying bacteria are needed to meet these limits.
Once the biological treatment is complete the final tank settles out its biological mass (activated sludge) and the clear, fully treated wastewater is siphoned into the Final Effluent tank. The wastewater is now known as final effluent. The final effluent is then pumped into two sand filters for final polishing. The final effluent flows through the sand. It is then put through an Ultra Violet unit to complete the disinfection process before it is discharged into the Credit River.
The Inglewood Wastewater Treatment Plant currently processes 4 batches of wastewater per day. The full capacity of the Plant is 10 batches per day.
This picture shows the tops of the tanks that are underground. The pipes that are candy cane shaped are breather pipes that bring air to the tanks. Those closest to the building are the anaerobic tank, the next one is the SAM tank and the third is the SBR tank. The latch closest to you in the photo is the Final Effluent tank.