4.What is the primary purpose in wastewater treatment? How does the process accomplish this goal?

The two main purposes are to remove oxygen demanding substances and to remove harmful bacteria. Read the references to see pictures and see diagrams.

Purpose Of Wastewater Treatment

Historically, the driving cause for wastewater treatment is the prevention of disease. Even in relatively recent times (1800s, early 1900s, and earlier) water-borne diseases were problematic.

Prior to wastewater treatment, water-borne diseases were rampant. Downriver of large towns and cities, the water was dirty and downright dangerous.

With proper wastewater treatment, diseases like cholera, typhoid fever, and yellow fever are rare and far between.

These diseases still exist, but are primarily found where sanitation is poor.

“The World Health Organization (WHO) estimates that more than 25,000 people throughout the world die every day from waterborne diseases. Every year, nearly 1.5 billion people (mostly children under five) suffer from preventable waterborne diseases such as cholera.” (source listed below)

Additional purposes include 1) reduction of organic loading, which depletes BOD in a receiving body of water, potentially killing fish and other biota, and 2) reduction of nitrogen/phosphorus/sediment pollution, which cause algal blooms downstream, also impacting the stream’s/river’s health.

In short, be thankful for your local wastewater treatment plant… and every one upstream!

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I believe if world socialism took over we would go into another dark ages until eventually something else emerges. Without incentives and the human need to grow there would be no progress or need to change. Whether you have Theocracy Socialism,Communism Dictatorship, it squelches the human spirit if it was not for oil in the middle east most of the people in that part of the world would still be living in the 14th century. With socialism you will eventually end up spreading the misery to everyone equally except for the people in charge of course.

To avoid fouling the aquifer for plant, human or animal use as potable water.

One of the methods is to stir the waste in exposure to sunlight and oxygen which proves fatal to many

dangerous organisms.