Industrial Wastewater Treatment

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Questions: Industrial WWT

Question One

1) Name the treatment units/processes shown on following flow diagram for a treatment plant used to
treat textile waste water:

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2) Advanced oxidation is chemical oxidation typically involves the use of chemical oxidants to
generate hydroxyl radicals (•OH), which chemical reaction may produce these radicals? List of
chemical unit processes using chemical oxidation as a treatment technique.

a. Ultraviolet radiation/hydrogen peroxide,
b. Ozone/hydrogen peroxide,
c. Ultraviolet radiation/ozone,
d. Fenton’s reagent (ferrous iron and hydrogen peroxide),
e. Titanium dioxide/ultraviolet radiation.

Unit processes included in AOP

 Ozonification
 UV with FeCl3
 UV with H2O2
 Solar radiation
 Gasification
 Wet air oxidation

3) Write down Oxidation/ Reduction reactions used to treat wastes


Substance Reaction

Oxidation of organics  { CH2O} + 2 {O}  CO2 + H2O
 Organics  CH3CHO + {O}  CH3COOH
 Aldehyde
Oxidation of Inorganics

- - -
Cyanide  2CN +5OCl +H2O  N2 +2HCO3 + 5Cl
 Iron (II) -2 +
 4Fe + O2 + 10H2O  4Fe (OH)3 + 8H
 Sulfur dioxide
 2SO2 + O2 +H2O  Cr2(SO4)2 + 2 H2O

Reduction of Inorganics -2 +
 Chromate  2CrO4 +3SO2 +4H  Cr2 (SO4)3 + 2H2O
- +
 Permanganate  MnO4 + 3Fe+2 + 7H2O  MnO2 +3Fe(OH)3 + 5H