Sewerage system in Fish Farm

Introduction:

The entire system of sewers used for collecting and carrying of the sewage by water carriage system is known as sewerage.

The following are the two methods which are mostly used for the collection and disposal of the refuge from urban areas.

                                       (a)  Conservancy system       (b) Water carriage system

Conservancy system:

This system is mostly used in villages, small towns and underdeveloped portions and slums of large cities. In this system different types of refuge are separately collected, conveyed and disposal off.

Water carriage system:

In this system collection, conveyance and disposal of the wastes is done with the held of water. The amount of water to be mixed with solid matter is so large that the mixture behaves more or less like water.

System of sewerage: There are three system of sewerage:

     (a) Separate system of sewerage 

     (b) Combined system of sewerage

     (c) Partially combined or partially separate system

Separate system of sewerage:

In this system of sewerage, two sets of sewers are laid. One sewer is meant for carrying sewage, while the other for carrying storm water. The sewage is carried to the treatment plant and the storm water is directly discharged into the natural rivers or streams.

Advantages:

(a) The sizes of sewers are small.

(b) Sewage load on treatment units is small.

(c) River or stream waters are not polluted.

(d) When sewage has to be lifted, this system proves economical as smaller amount of sewage will have to be handled.

 Disadvantages:

(a) Sewers being small, it is difficult to clean them.

(b) As two sets of sewers are to be laid, it proves to be a costly system.

Combined system of sewerage:

When only one set of sewers is used for collecting and conveyance of both, storm water and sanitary sewage, the arrangement is called a combined system of sewerage.

Advantages:

u The size of the sewers is large, which is easy to clean. Also there are less chances of choking of large sewers.

u Only one set of sewer is to be laid and thus proves economical.

u Maintenance cost is reasonable.

Disadvantages:

u The sewers are large in size and, therefore, their handling and transportation is difficult.

u  Due to storm water, the load on treatment plants is unnecessarily increased.

u During heavy rains, the sewers may overflow and may create unhygienic conditions.

u Storm water is unnecessarily polluted.

Conclusion: 

Sewerage system is as important as water distribution system. So, every fish farmer should take a serious note about it.