Stages In Waste Water Purification System

With the daily ever growing urbanization, you will agree with me that the impact on the environment is very adverse due to sewage disposal. Sewage can be from the households or the industries in towns. You will not be comfortable to observe dirty water released into you area of locality if it has not been properly treated or purified. Those that contains pollutants needs to be treated so that its quality can be improved. This means that its negative impact on the environment is so much reduced. By so doing we will be promoting biodiversity and 

preventing healthhazards. 

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In the procedure of purifying the already polluted water, various steps are employed. They utilize chemical agents, living organisms and physical agents to remove the harmful agents already present in water.

The initial stage is the pretreatment stage. This involves removal of any pollutant that can possibly be removed. Usually they are the large objects which can be collected through sieving. This can be comfortably be achieved by use of mesh or screens that act as barriers along pathway of flowing polluted water. The removed large objects are then taken to the incinerator for complete destruction. In case they are not removed, they will get into the pipes and cause blockage. Not only is sand, broken glass or stones collected at this point but also fat and grease. Besides, the flow is equalized so that it does not collapse the whole system.

Secondly, is the primary treatment stage. It takes place in the sedimentation tanks and the clarifiers all that are of primary nature. Settling down of solids occurs especially with heavy objects. The light objects float and are cleared off. These include oil which is a raw material for the process of saponification.

Thirdly, we get to discuss secondary treatment. This step removes the biological pollutants. They could be in suspension form or even dissolved. A habitat for small living organisms, waterborne, is established then these organisms feed on the biological matter. Thereafter the organisms are removed before advancing to the next stage of treatment. This is advantageous in that it consumes very little space.

Tertiary stage of treatment aims at improving the quality of the outcome. The liquid is made to be clean. This is through microfiltration depending on the system type. Before the effluent is let into the locality, harmful gases are removed. Toxins are not left to remain in water at this stage.

In the final part of this step, this liquid is taken into ponds and dams. Here, the biological agents assist in removing the remaining pollutant matter. Then this water can be used for irrigation purposes. Recharging the ground water sources can be another use.

To end with is stage of fourth treatment. It has already been employed into a number of systems after detailed research on it. It removes those chemicals that rot at slow pace. In this stage also, the odor coming from the purification process needs to be effectively controlled.