Skip to main content

Air Pollution

Air Pollution

[caption id="attachment_1282" align="alignnone" width="540"]Air Pollution Air Pollution[/caption]

The earth is the only object known in the entire universe capable of supporting life. This supporting of life is mainly due to the presence of its unique atmosphere. Today there is overwhelming evidence that various pollutants do and will continue to affect life on this planet adversely; In the wake of industrialization, consequent urbanization and ever-increasing population, the basic amenities of life, viz., air, water, and land are being polluted continuously. Industrial complexes have become the foci of environmental pollution.

”Air is the most essential requirement for life” and it can be. gauged by the fact that man can hardly survive for 5 minutes without air; however, he can survive for 5 days without water and for 5 weeks without food. It has become increasingly evident that air pollution is affecting the vegetation and non-living things like metals, marbles, woods, paint, papers, etc., to the same extent as it is affecting human and animal lives.

Air pollution causes

The imbalance in quality fo air so as to cause adverse effects on the living organisms existing on earth.

Air pollution can also be described as

”Substances introduced into the air by the activity of mankind in such concentrations sufficient to cause serious effects on his health, vegetables, property or interference with the enjoyment of his property.”

Commonly air constitutes 80% of man’ 5 daily intakes by weight. We breath 22,000 times a day inhaling 16 kg of air. It is, therefore, essential that we know enough about the air around us and the means to keep it clean.

India’ main problem of air pollution arises from the fact that 80% of its industrial production is concentrated in some large industrial centers. This has created severe environmental pollution problems in isolated pockets.

Read More

Popular posts from this blog

Limitations of Terzaghi Theory

Limitations of Terzaghi Theory The value of the coefficient of consolidation has been assumed to be constant.  The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated.  There is sometimes difficulty 1n locating the drainage face, sometimes thin previous seams that can act as good drainage face are missed in the boring operations. The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation. The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation. In actual practice, the pressure distribution may be far from linear or uniform. Read More Muller-Breslau principle

Price Guard Wire Method

Price Guard Wire Method Some form of  Price Guard Wire Method  is generally used to eliminate the errors caused by leakage currents over insulation. Fig. 3.14 illustrates the operation of This Method. In fig 3.14(a), a high resistance mounted on a piece of insulating material is measured by the ammeter voltmeter method. The micro-ammeter measures the sum of the current through the resistor (IR) and the current through the leakage path around the resistor. The measured value of resistance computed from the readings indicated on the voltmeter and the microammeter, will not be a true value but will be in error.   Figure 3.14 Application of  guard  circuit for measurement of high resistance In fig, 3.14 (b), the  guard  terminal has been added to the resistance terminal block. The  guard  terminal surrounds the resistance terminal entirely and is connected to the battery side of the micro-ammeter. The leakage current IL now

Negative Booster

Negative booster A negative booster is employed to conform to the regulation that the potential difference between any two points of the rail return shall not exceed 7 V. Two boosters, positive and negative, are used which are mechanically coupled together and driven by a DC motor. The positive booster is connected to the trolley wire (near the generating station) and the negative booster (separately excited) is connected to the track rail.  The 'positive booster' adds voltage to the line while the 'negative booster lowers the potential of the point it is connected to. As we go along the trolley wire away from the generating station/sub-station, the potential drop increases, and the voltage of the trolley wire falls. Since the current returns via the track rail points away from the generating station acquire high potentials. This potential is brought down by the negative boost provided by the negative booster. When the load is sufficiently far aw