ISO 9001:2008 ISO 9001:2015


Role of Sewage Treatment Plants In Controlling Water Pollution

The quality of water resources defines the quality of life but on the contrary water crisis has been the major environmental concern for the past decade. Water resources are getting contaminated by various factors which include both domestic and industrial pollutants. The sewage water has both biological and chemical wastes and hence risks are high when they are directly released into the living ecosystem. Sewage treatment of wastewater is highly recommended as they help in purifying the major impurities. Sewage treatment plants perform the function of treating the sewage water collected from industrial and domestic sources. The industrial and domestic sewage water contains heavy solid impurities, organic wastes, toxic chemicals and so the sewage treatment process should be efficient in treating and removing the toxic wastes before the disposal of wastewater in living systems hence making it safe.

Stages of Treatment

The constructional design of sewage treatment plants is simple and the working involves a series of treatment process. The primary stage of the sewage treatment involves the sedimentation process. The sewage water which is collected in huge tanks is allowed some time which results in the sedimentation of heavy solid impurities to the bottom of the tank while the liquid impurities floats over the top surface. Later the liquid impurities including oil floats, grease are removed using clarifiers which are mostly circular in shape and this process is termed as clarification.

The secondary stage of working in the sewage treatment plant is the aeration process. Aeration is basically the sludge activation process which is carried out using large sized fans called aerators. As the organic impurities requires high BOD (Biological oxygen demand), the aerators supplies oxygen to the bacteria and they results in the formation of sludge which is removed at the later part of the secondary stage. The efficiency of the aeration process depends on the design of aerator fins and the tanks design dimensions.

The treated water from the secondary stage has chemical or physical infect ants. Tertiary stage involves the disinfection process of the toxic impurities thus making it safe for the disposal of treated water. Sewage treatment plants helps in reducing the hazardous contaminations getting released into natural water bodies thus controlling water pollution.

Sewage treatment plant helps in putting the brakes over water pollution thus giving a stable hold to maintain the balance in the ecosystem. Though the process of sewage treatment is simple it is not followed extensive. Awareness on sewage treatment must be shared through various platforms of the media. The major reason for poor growth of population in underdeveloped countries is due to water crisis and water contamination kills the health of good and hygiene life. Though the world has three fourth of its content to be water, just a couple percent is available for human usage. So the reuse of water in agricultural sectors and industries should be encouraged. Reuse is not possible without proper treatment of the sewage water and hence the sewage treatment plants are as important as hydro power plants.

Innovations In Waste Water Recycling system

70 percent of the world is seen blue from moon is what people say which means we have abundant water but what part in it can be used by the humans. Statistics says only 2.5% of the total available water is fresh and rest is either saline or ocean based. Water scarcity and Water pollution are threats making life’s sustainability tough and so an alternative has to be formulated to counter tackle the crisis. Wastewater recycling and purification through equipments like Clarifiers, Reverse Osmosis systems and Oil separators simplifies the process of treating million gallons of water every day.

Wastewater effluents that needs to be removed in wastewater recycling system

The metal impurities present in wastewater are the major effluents from industrial wastes. Most commonly found metal impurities in wastewater include chromium, lead, nickel, tin, cadmium. The dissolved solid impurities comprises of inorganic solids including bicarbonates, chlorides and sulphates of sodium, potassium and magnesium.

Compact Disk Wastewater recycling system

Din Ping Tsai, a physicist at National Taiwan University, along with colleagues has made a water recycling system which utilizes the flat and smooth surface of a Compact disk. Based on study it is evident that CD’s are ideal in supporting zinc oxide nanorods which along with Ultraviolet light can act as a photocatalyst helping in separating impurities. When water is turned on it a thin water film is formed and reacts with the nanorods. This leads in creating a thin water film which effectively relates to the photocatalytic layer of the reactive nanorods made from zinc oxide. The zinc oxide helps in breaking down the organic pollutants in the wastewater.

Since compact disks are outdated, they get accumulated to the e-waste and this water recycling system will surely help to minimize the dumping of disks.

The CD wastewater recycling system consists of layers of zinc oxide coated CD, a Ultraviolet light source and a system that works to recirculate the wastewater to further break down the contamination. The research team conducted water recycling system test using an organic solution for one hour and found that about 95% of the contaminants had been broken down after 1 hour.


The spinning compact disk water recycling system being small consumes very limited amount of power and has more efficiency rates when compared to other water treatment techniques. Since the overall recycling system is quite smaller in overall size, the system can be incorporated by small scale industries. Also the team is working upgrade this recycling system’s work efficiency by stacking up layers of compact disks in a single system.

Wastewater recycling needs to be taken up into serious consideration primarily by industrial units as industries are major causes for water pollution and the reason firms not taking up the water recycling phase is mainly due to costing and the area required to set up the treatment is large. If this compact disk wastewater recycling system can reach to be followed, it will surely be a technological revolution counter facing pollution.