Wastewater Treatment Plants

The Noble Concept of Wastewater Treatment Plants (WWTPs)

It’s been estimated around 2.8 billion People around the world have water scarcity of at the minimum of 1 month a Year, and out of which around 1.2 Billion lack the facility of clean Drinking Water. With the growing Water scarcity and lack of resource availability, concepts such as WWTP are the way forward for many countries across the globe.

The process of converting waste water from Sewage or Industry to reusable one is the basic concept of WWTP technology. The process is a slow and intrigue one, which requires experts to do the steps to precision with the help of water treatment plant.

Waste Waters

Sewage Water

Is the water used in domestic residence (i.e. originating from toilet, sinks, and showers).

Industry Water

Is the water used emitted from production, industrial or commercial activates, and the components from them vary from one origin to another.

Procedures involved in Water Treatment

Pretreatment Phase

The foremost process of WWTP is to pull Water from sewer system to the treatment plant using gravity. Then this water flows through gravel chamber, which would settle out the grit form water. Afterwards, gravel is disposed at the dump. Then the water reaches the bar screen, which is used to remove large objects. Layers of screen are used to remove smaller objects such as cigarette butts or undigested foods.

After the removal of large objects, grit is to be removed from the wastewater. Similar to the gravel chamber, grit chamber allows the settlement of grit. Then the grit are removed and disposed. Both grit and gravel are non-reusable due to contamination levels.

Primary Treatment

The water is then moved to primary settling tanks, where the water is driven to hopper in the base of the tank. Hopper arms are used to settle the sedimentation at the bottom of the tank. Around 60% purification process is done once this process completes. 

Secondary Treatment

The process of biological treatment is followed at the secondary treatment. WWTP uses bacteria which observes contaminants such as biodegradable organics, carbon and phosphorus. This residue is converted into sludge. The excess sludge is transported to digestion tank.  In the digestion tanks, sludge pumped out of the settling tanks is heated and mixed. The biogas is produced during the digestion process from the sludge which can be reused, for electrical and thermal energy production.

When the sludge reaches optimal level, the second digestion stage takes place in storage tanks. The semi-solid sludge is transported back for further treatment. Sludge is finally disposed of at the dump. After a month, sludge is adequately dried out and ripe. This can be used for fertilization of industrial crops. The final step of wastewater treatment is the deep inspection of service water.

The whole process Waste Water Treatment Plant is certainly a difficult one, which requires knowledge in depth. With the global shortage of Water, the future looks a lot better with the availability of options like this.

Image Source: dutchwatersector.com

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