The MLSS concentration in the aeration tank of extended aeration activated sludge process is 4000 mg//. If one litre of sample settled in 30 minutes and the measuring cylinder showed as sludge volume of 200 ml, then the sludge volume index would be nearly

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Hydrogen Energy

Energy is a quantity that cannot be defined, its existence can only be felt. In simple language, if a system possesses energy, it can do a specific kind of work. There are many forms of energy sources which people can use to obtain work. Solar energy, tidal energy, hydroelectric energy, geothermal energy, wind energy are some of the renewable energy sources which are primarily used for the production of electricity.