Different Types of Sewerage Systems and Their Pros and Cons

Man fixing the pipe

Sewage can pollute drinking water sources, groundwater, natural water bodies and other waters for recreational purposes. Left untreated, it can also give off a bad odor and serve as a breeding ground for flies and microbes, spreading disease.

In addition to the public health effects, improperly disposed sewage can also affect the environment. Therefore, it is crucial for any New Orleans civil engineering company that boasts of efficiency, to cater to the efficient collection, adequate conveyance, treatment and proper disposal of sewage.

A collection system encompasses all the processes involved in moving the wastewater from individual houses to when the sewage is safely disposed of. The following are three types of systems:

The Separate System

This system uses separate conduits to carry sewage and water run-off. The wastewater goes to the plant for treatment, and the rainwater is discharged into a river or natural stream without undergoing any treatment.

The separate system is economical regarding running and capital costs since there is no pumping required to run the sewage treatment works.

The Combined System

In the combined system, one set of sewers carries domestic and industrial sewage together with rainwater. Since the system relies only on one set of drains, it is easy to maintain and clean because the sewers are large.

Additionally, rainwater dilutes the sewage, making it easier to treat. However, it is costly to construct a combined sewage system. Treatment units will also need to be heavily loaded to handle more substantial amounts of sewage.

Partially Separate Systems

Here, the industrial, domestic waste and water run-off are carried in the same sewer sets, but rainwater from house fronts and roads is moved in open drains. This system enjoys the advantages of both the combined and the separate system.

However, during the dry weather, the velocity of sewage flow decreases in a way that self-cleansing becomes difficult.

Since all the systems have potential pitfalls and benefits, a few more factors should govern the final choice. For example, consider the interests of the community as well as the planning and design of homes in the area. In the end, the sewage system should serve the community.