3 Major Types of Sewer Systems
Sewer systems are specifically designed to collect, treat and dispose of sewage. Listed below some types of sewer systems. Let’s be knowledgeable about these systems by getting to know their function, advantages and disadvantages. Through this, you’ll be able to know what type of system is used in your community. So, here are some types of sewer systems.
Separate System. Separate sewer system carries the storm water and the sanitary sewage separately. They are designed to gather and transport waste water and storm water run-off. This type of system could also gather wet weather flow through prohibited connections from the storm sewers or house drains, along with the errors in the manholes and pipes.
The separate system could cost much higher than the combined system since two divided networks are necessary. However, separate sewer system can contribute a high level of comfort and hygiene to the community. This is also an environment-friendly system since the sewage is moved through a closed system straight to the treatment which won’t pour out to the environment. A separate system is suitable for areas where heavy rainfall is rarely expected and urban areas that have resources enforce, perform and preserve the system.
Combined System. Combined sewer systems are commonly found in urban areas where they have the complete resources such as implementing, operating and maintaining the system. On-site pre-treatment or storage of the waste water is not necessary for this system. The storm water run-off, domestic sewage and industrial waste water are transported only through a set of sewers then to the centralised treatment facility.
Waste water treatment plant (WWTP) is where all the waste water are conveyed to be treated and released to a water body. This type of system can also supply a high level of comfort and hygiene to the users. The initial cost and the maintenance cost for this type of system are much higher compared to the decentralised systems. The maintenance for this system requires trained professional to inspect, unblock and repair the system. The knowledge of an expert or professional is highly needed for the repair and maintenance to avoid improper repair. However, the required operation and maintenance is moderate. When there is a change of alignment or gradient, manholes are then installed.
Solids-free Sewers. This type of sewer system removes solids and the waste water is pre-settled before it can enter the system. It can be built at a cheaper cost since it has a simplified design and can be repaired with the use of available materials in your local area.
To ensure the optimal performance of the pre-settling units, it should be emptied and maintained routinely. Once the sewer is well maintained and operated, there could probably be a reduced risk of the pipes to be clogged and also low operating costs. That is why regular maintenance is required in every system. This is to keep systems function longer than expected. Solids-free sewer is best suited to areas where soak pits are not appropriate because of lack of space for on-site filtration or sensitive groundwater. A constant supply of water is also necessary for this system.