Advantages and Disadvantages of Sewerage System

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At the point when the system of sewers is laid separately to convey residential and mechanical sewage in one lot of sewers and the tempest water in another arrangement of sewers, it is called a separate system. 

At the point when one lot of sewers given to convey local and mechanical sewage is likewise permitted to convey a bit of tempest water is conveyed in a separate arrangement of sewers, this system is called a partially separate system. 

It is supposed to be a combined system of sewerage when just one lot of sewers is laid to convey both the household and modern sewage and the tempest water. The combined system is utilized in zones that have a little precipitation and that too dispersed equally consistently. In such places, self-cleaning speed will be accessible nearly in all the areas. This system is likewise utilized in towns where the amount of sewage is little. 

In the regions where there is overwhelming precipitation during the stormy season, it is fitting to give the separate system because oneself cleaning speed will not be accessible for the majority of the time of the year. 

Sewerage is the system by which sewage is conveyed. It might be characterized into the accompanying three sorts: 

Here are the advantages and disadvantages of different types of sewerage system:

1. Separate System 

Merits and Demerits of the separate system are as per the following: 

Advantages of Separate System

  • As two separate sewers are given to convey sewage and tempest water, the amount of sewage to be treated at treatment plants is little because of which structure of treatment works can be made conservative. 
  • The separate system is commonly less expensive because of the way that solitary clean sewage is required to be taken in the shut sewer. The tempest water can be taken in open channels which are built with considerably less expense. 
  • There is no dread of stream contamination in the separate system. 
  • On the off chance that solitary the sewage is to be siphoned during removal, this system is less expensive. 

Disadvantages of Separate Sewerage System

  • As the separate arrangement of sewers is laid for sewage and tempest water, along these lines its upkeep cost is more. 
  • Because of the little amount of sewage in the sewer, it is hard to make itself clean. Subsequently, flushing of sewer is required for its cleaning. 
  • There is consistently a chance of tempest water to get blended in with sewage sewer which may cause flooding of sewer and making an overwhelming burden on the treatment plant. 
  • The two sewers laid in a path may make an incredible burden to general society at the hour of its upkeep. 

2. Partially Separate System 

Merits and Demerits of the partially separate system: 


  • It is an improved tempest of separate systems. The size of the sewer can be planned according to necessities and monetarily. 
  • Crafted by house plumbing is decreased because downpour water from rooftops, sullage from restrooms and kitchen is permitted to blend in with sewage in a similar sewer which conveys the release from water closes however the water from every other spot can be taken in separate sewer or channel. 
  • Like the little bit of tempest, water is taken in a similar sewer which conveys sewage because of which self-cleaning speed is obtained, and subsequently, no flushing of the sewer is required. 


  • As the segment of tempest water is taken with the sewage, accordingly the expense of siphoning is expanded to a separate system. 
  • In dry climates, there is a likelihood that self-cleaning speed may not be created in the sewer. 
  • The chance of flood is likewise not precluded in a partially separate system. 

3. Combined System 

Merits and Demerits of the combined system: 


  • In the combined system self-cleaning speed is effectively accessible at all spots in the sewer. So there is no need to flushing the sewer. 
  • The sewer is weakened by downpour water because of which very well may be dealt with effectively and financially. 
  • House plumbing can be effortlessly done because just one voice is required to be laid. 
  • In blocked zones, it is anything but difficult to lay one huge sewer than two separate sewers. 


  • The combined system has a high introductory expense. 
  • As the amount of sewage is expanded for this situation, subsequently siphoning of it isn’t practical. 
  • In the regions which have precipitation for the littler time of the year, the combined system isn’t reasonable at such places since it will not be conceivable to create self-cleaning speed during dry climate as the stream will be little which will bring about silting of the sewer and subsequently flushing of the sewer will be essential. 
  • During the time of substantial downpours, the flooding of sewers may jeopardize the general wellbeing.

Vacuum Sanitation System

The vacuum sewage sanitation system is used in difficult areas because it is a cheaper procedure than others and has proven its high reliability over time.

The water evacuation system is based on maintaining, within the pipes, a permanent pressure that is maintained between –0.5 and –0.6 atmospheres. This is achieved by the effect of special vacuum pumps and valves.

The difference between permanent pressure and atmospheric pressure causes the valves to open, absorbing the wastewater found in the wells. Subsequently, the vacuum in the pipes generates flows, first towards the vacuum station and then towards the sanitation network itself.

Germany and the Netherlands, in Europe, and the United States, are the three countries in which more wastewater sanitation interventions have been carried out with the vacuum technique.

In general, those places with a terrain typology that presents a high water table and plain will benefit from this technique. Vacuum sanitation is also especially suitable for coastal areas. Estimates are that thanks to this procedure, the evacuation of wastewater can have an average of about 6,000 cubic meters per day, although the amount can be highly variable.

Advantages of the Vacuum Sanitation System

  1. Less excavation depth for pipe installation, which reduces the risks that operators must face during the installation of the system.
  2. The flexibility of the pipe helps prevent breaks, leaks, and leaks, something that can happen in the case of pipes made of other materials.
  3. The pipes used have smaller diameters than in other systems, something that is compensated by the high speeds that the water reaches on its way through the pipes.
  4. The tubes usually have a diameter of up to 250 millimeters, but there are also cases of installation of 315 mm pipes.
  5. Lower energy consumption. Unlike traditional methods, vacuum sanitation is more efficient and requires much less energy expenditure.
  6. Investment cost in civil works reduced the use of other methods. Excavations are faster, which also reduces the impact in urban areas, even more so if they have road traffic. Furthermore, the maintenance cost is also lower than in other cases.
  7. Elimination of bad odors in the sewer network, something much more difficult to avoid in the case of traditional sanitation systems.
  8. Reliability. With this system, it can be ensured that there are no risks of contamination of the subsoil. There is constant aeration of the wastewater, which prevents the water, with polluting components, from damaging the environment at any time. In addition to all this, there is total control of the final discharge.

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