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