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Category: ENV

Relation Between B.O.D (Biochemical Oxygen Demand) And Time

Posted on 8th March 201922nd February 2022 By Malay Sautya

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…

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ENV, WasteWater

3 Difference Between Biochemical (B.O.D) and Chemical (C.O.D) Oxygen Demand

Posted on 7th March 201922nd February 2022 By Malay Sautya

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…

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ENV, WasteWater

What do You Mean Natural Resource

Posted on 27th February 201922nd February 2022 By Malay Sautya
What do You Mean Natural Resource

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…

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ENV

Primary and Secondary Air Pollutants- And Their Examples

Posted on 26th April 201823rd June 2022 By Malay Sautya
Primary and Secondary Air Pollutants- And Their Examples

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…

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ENV

What is Smog

Posted on 11th February 201821st June 2022 By Malay Sautya

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,…

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ENV

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