Relation Between B.O.D (Biochemical Oxygen Demand) And Time At certain temperature, the rate of deoxygenation is assumed to be directly proportional to the amount of organic matter present in the sewage at that time. dLt / dt = – K.Lt ………….(1) Relation Between B.O.D And Time [Note: Minus sign indicates that the with the passage of…
Read More “Relation Between B.O.D (Biochemical Oxygen Demand) And Time” »
3 Difference Between B.O.D & C.O.D Following are the 3 differences between B.O.D (Biochemical oxygen demand) and C.O.D (Chemical oxygen demand) are described below: B.O.D (Biochemical oxygen demand) C.O.D (Chemical oxygen demand) 1. The amount of oxygen required to carry out the biological decomposition of dissolved solids in sewage under aerobic conditions at standard…
Read More “3 Difference Between Biochemical (B.O.D) and Chemical (C.O.D) Oxygen Demand” »
The efficacy and stability of an ecosystem remain constant through the flow of energy and matter through it. Natural Resource We regard it as a natural resource, which is connected with the existence of this energy and material, the population and ecosystem. That is all the resources that can fulfil the physical and socio-cultural needs…
Air pollutants can also be broadly classified into two general groups- Primary air pollutants and secondary air pollutants. A. Primary Air Pollutants Primary air pollutants are those emitted directly from identifiable sources. Examples of primary air pollutants:1) Fine particles(less than 100 μ in diameter)2) Coarse particles (greater than 100 μ in diameter)3) Sulphur compounds 4) Oxides of…
Read More “Primary and Secondary Air Pollutants- And Their Examples” »
What is Smog Smog is a synchronously of two words smoke and fog, Smog can be of two types—Photochemical or coal-induced. • Photochemical Smog is caused by the interaction of some hydrocarbons and oxidants mainly (nitrogen oxides) under the influence of sunlight rise to dangerous peroxyacetyl nitrate (PAN). • Its main constituents are nitrogen oxides, PAN, hydrocarbons,…
