Physico-chemical Treatment Technology — Summer 2021

Enlist the components of wastewater flows

Name the statistical parameters used for the analysis of wastewater management data

Calculate the head loss for a water at 20 ºC having density (kg/m3) and viscosity (kg/m.s) 998 and 1.002*10-3 passing thro’ a bed of sand having grain diameter of 0.4 mm and shape factor of 0.85. Take porosity of bed as 0.45. The sp. gr. of sand is 2.7. The depth of the bed is 0.65 m. Take filtering velocity as 5 m/hr.

Discuss in brief purpose of grit chamber

Show classification of screens

Point out the important characteristics of filter medium

Explain Jar test for optimum coagulant dosage

Write a short note: Ionic layer compression

Summarize the important characteristics of ideal disinfectant

Show settling column analysis for type-1 suspension

Write a short note: Interparticle bridging

Summarize the principal mechanisms/phenomena that contributes to the removal of material by the granular media depth filter

Show settling column analysis for flocculating particles

Explain elutriation of sludge in brief.

Write a short note: Aerobic sludge digestion

Derive the equation for stokes law

Explain chemical conditioning in brief.

Write a short note: Anaerobic sludge digestion

Discuss in details the various disinfection mechanisms

With the help of a neat sketch, show sludge drying bed

Categorize the sludge conditioning methods

Describe the factors influencing the action of disinfectants

List various sources of sludge from effluent treatment plant

Draw only a schematic diagram of rotary vacuum drum filter

Write a short note: Disinfection methods and means1