What is the Tertiary Treatment of Domestic sewage systems?
Advanced sewage treatment typically consists of three major stages, referred to as primary, secondary, and tertiary treatment, but may also include intermediate and final polishing processes. Tertiary treatment (also known as advanced treatment) is intended to provide a final treatment stage to further improve effluent quality before it is discharged to the receiving water body or reused. At any given treatment plant, more than one tertiary treatment process may be used. If disinfection is used, it is always the last step. It is also known as effluent polishing.
Tertiary treatment may include biological nutrient removal (also known as secondary treatment), disinfection, and removal of micropollutants such as environmental persistent pharmaceutical pollutants.
Tertiary treatment is sometimes defined as any treatment that goes beyond primary and secondary treatment to allow discharge into a highly sensitive or fragile ecosystem, such as estuaries, low-flow Rivers, or coral reefs. Treated water is sometimes chemically or physically disinfected (for example, through lagoons and microfiltration) before being discharged into a stream, river, bay, lagoon, or wetland, or it can be used to irrigate a golf course, greenway, or park. It can also be used for groundwater recharge or agricultural purposes if it is sufficiently clean.
Sand filtration removes a large portion of the residual suspended matter. Toxins are removed by filtering over activated carbon, also known as carbon adsorption. Micro filtration and synthetic membranes are also used, for example, in membrane bioreactors to remove pathogens.
Storage in large man-made ponds or lagoons can aid in the settlement and biological improvement of treated sewage. These lagoons are highly aerobic, and native macrophytes, particularly reeds, are frequently encouraged to colonize.
Following are among the most popular tertiary treatment systems on the market today
1: Sand Filters
For tertiary treatment, sand filters are extremely effective. They are layers of certified silica sands and gravels installed in accordance with EPA specifications. Sand filters have limitations in that they can be large, expensive to install, and require a certain level of skill on the part of the installer.
2:Filters made from coconut
There are some new tertiary treatment products in the market that treat wastewater with waste organic material such as peanut shells and coconut shell fragments. These systems are preinstalled in a tank. The advantage over a sand filter is that they are tank-based systems, making them easy to install. One disadvantage is that they are costly in terms of both cost and maintenance.
3: Units of Filter pod
The systems are preinstalled in a small tank and are ready to use. The filter pod can also be used in place of a percolation area. The filter media is synthetic, which means it is far less expensive to replace than organic waste. Sand filters are far less expensive and much easier to install.
Solutions that can be provided
It is a treated sewage that can be attempted to kill pathogens (disease-causing microorganisms) before disposal, and it becomes more effective as more elements of the preceding treatment sequence are completed.
The goal of disinfection in sewage treatment is to significantly reduce the number of pathogens in the water that is discharged back into the environment or reused. The effectiveness of disinfection is determined by the quality of the treated water (turbidity, pH, etc.), the type of disinfection used, the disinfectant dosage (concentration and time), and other environmental variables. Water with a high turbidity will be treated less successfully because solid matter can shield organisms from ultraviolet light or if contact times are short.
What can Netsol Water offer?
Netsol Water offers a comprehensive range of water treatment technologies (Reverse Osmosis and much more) and services to meet the demands of a variety of industries, and our skilled staff can make suggestions on the best solution. This might be as simple as optimizing current equipment and methods to achieve the desired performance or including a new phase into the treatment process.