why back washing is performed in DM water plant?

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I would like to know how to size a partial combustion reactor processing methane and oxygen, as a function of the flowrate and of the pressure.

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Why reflux is necessary in distillation column?

1 Answers   Deepak Fertilisers,

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What is the main difference between deflection and null type instruments?

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What are some typical applications for glass-lined reactors?

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The process conditions of the fuel gas are as follows: Temperature = 25 deg C Pressure = 4 bar g Calculate the line size for the fuel gas supply line to the superheater

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ENVIRONMENTAL ENGINEERING - QUESTION 22.2 : Biochemical Oxygen Demand (BOD) could be calculated using the formula BOD = (DOi - DOf) (Vb / Vs) where Vb = Volume of bottle in ml, Vs = Volume of sample in ml, DOi = Initial dissolved oxygen in mg / L, DOf = Final dissolved oxygen in mg / L. (a) By using a bottle of Vb = 300 ml with sample Vs = 30 ml, find the BOD if DOi = 8.8 mg / L and DOf = 5.9 mg / L. (b) By using a bottle Vb = 600 mL with sample Vs = 100 mL, find the BOD if DOi = 8.8 mg / L and DOf = 4.2 mg / L. (c) Find the average BOD = [ Answer of (a) + Answer of (b) ] / 2. (d) If the BOD-5 test for (a) - (c) is run on a secondary effluent using a nitrification inhibitor, find the nitrogenous BOD (NBOD) = TBOD - CBOD. Let TBOD = 45 mg / L and CBOD = Answer of (c).

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A shiny brown colored element ‘x’ on heating in air becomes black in cooler name the element ‘x’and black colored compound formed?

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Explain what types of valves are recommended for slurry services?

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What is a common source of error in determining the percent spent caustic in refinery applications?

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Explain global warming from a common man's and an engineer's perspective?

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PLEASE ANY ONE READ THIS MESSAGE ANSWER ME AT MY EMAIL ID surendrasaroj18@gmail.com sir i am prepairing for section engineer exam taken by railway my branch is chemical engineering i want previous paper of chemical engineering of section engineer exam taken by railway. please answer me as soon as possible thankyou

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