water pollution and treatment lec: sep 6 ,...

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CVL100:Environmental Science(2-0-0)Dr. Arun Kumar

(Wednesday and Friday) (Minor 1 –Minor 2)

Water Pollution and Treatment

Lec: Sep 6th, 2019

See Website: http://web.iitd.ac.in/~arunku/ (teaching activitiy section � CVL100)

Check IITD course email daily for information

Re-cap

• Introduction of water quality constituents; parameters

• Development of schematic of water treatment plants

Oxygen Demanding Wastes

Example 1: Treatment schematic

(GW� Potable drinking water)

• Raw Ground water � aeration chamber �

Softening unit � Filtration with chlorination

�Disinfection � Storage

• Guidelines for drinking water?

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Parameters;

individual

compounds

also

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Courtesy:

Prof. B.J.Alappat,

IIT Delhi

Example 2 (read the paper from course web area)

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To remove large materials and solids

Stackelberg et al. 2004

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To remove solids; coagulants addition

Stackelberg et al. 2004

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To remove pathogens; oxidize reduced substances also

Stackelberg et al. 2004

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Stackelberg et al. 2004

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Calculate: (a)% removal; (b)partitioning of initialcompounds in finished water and in solids

For AHTN%removal =100(1-{Cfinished/Craw})

Partitioning in Finished conc. = {Cfinished/Craw}

Partitioning in solids={Csettled/Craw}

Exercise 1: Yamuna River Water �Drinking water

• Think for 5 minutes for two steps.

• Step 1: water quality characteristics determination

• Step 2: selection of units, their order

• Can you compile Yamuna watercharacteristics as per parametersmentioned earlier?

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Example 3 (read the paper from course web area)

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Calculate: (a)% removal; (b)comment onremoval between different stages

Ternes et al.2002

Exercise 1: Yamuna River Water �Drinking water

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Say I am considering volunteering for a one-way

trip to Mars [I can send weekly updates, though!],

which requires my commitment on

optimizing/reducing my daily water consumption.

One option is to use treated wastewater for my non-

drinking activities. Which two parameters do you

suggest me to monitor before I accept the condition

and why?

Exercise 2

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Suppose IIT Delhi water has suspended solids,

organic matter, microorganisms, hardness, and

dissolved CO2, which are problematic constituents.

Other dissolved constituents are below problem

levels. Draw a schematic diagram of a treatment

plant that will render this water potable. Identify

each unit and show points of chemical addition with

their names.

Exercise 3

Example 3 (read the paper from course web area)

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Calculate: (a)% removal; (b)comment onremoval between different stages

Ternes et al.2002