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Wastewater Treatment Using Catalytic Oxidation-Water System with Natural Mineral Catalyst

 

JAPAN

POSTECH

- Mecha-Cera Catalyst

- The Catalytic Oxidation-Water System has been

used in living effluent, odor, VOC and others wastewater treatment.

- Development Catalyst (P1, P2,P3)

- Lab scale test

- Pilot Plant Test

- Current Work

Development of New Type Catalyst to make more cheap and active calyst

--> Natural Mineral Catalyst
 

 

>>> Catalytic Oxidant water enhance xidation potential of NaOCl solution

< Catalytic Oxidation-Water System>

 

 

Zimpro process schematic
< Catalytic Wet Oxidation System>



Advantage of COW system

 - Energy saving because of operating in room temperature and 1atm

 - Preventing poisoning catalyst and no need to separate catalyst because of separating catalyst with reactant

 - Easy to make hybrid system because of small size of catalytic bed

 
 


 


Natural mineral

species (wt%)

Titanium magnetite

TiO2 (20.7), Fe2O3 (49.2), SiO2(11.4),
Al2O3(4.69), MgO(4.78), Na2O(2.19),
CaO(0.73), K2O(0.18),

Magnetite

Fe2O3(90), SiO2(3.0), Al2O3(1.87), CaO(0.02),
MgO(0.06), Mn(0.14), S(0.025), P(0.064),

Rutile

TiO2(95.31), ZrO2(0.75), SiO2(0.70),
Fe2O3(0.35), Al2O3(0.35)

Kaolin

SiO2(47%), Al2O3(38%), Fe2O3(2.8),
CaO(1.0), K2O(1.0)


 

<Batch System>

 

<Continuous System>

 

 
  - # 1  :Titanium magnetite
  - # 2  : Magnetite
  - # 3  : Rutile
  - # 4  : Magnetite + Kaolin
  - # 5  : Rutile + Kaolin
  - # 6  : Titanium magnetite + Magnetite + Kaolin
  - # 8  : Magnetite + Rutile + Kaolin
  - # 9  : Titanium magnetite + Magnetite + Rutile + Kaolin
  - #10  : Kaolin

<ORP of NaOCl solution = 660mV>


 


  Experimental condition (Batch System)

   - Orange 2 = 1g/L solution ( CODcr = 1500ppm)
   - NaOCl solution concentration = 200ppm
   - Volume of Orange 2 solution = 100ml
   - Volume of NaOCl solution = 10ml
   - No aeration
   - Vigorous stirring
   - Reaction time = 6 hours
   - Amount of catalyst = 1g

>>> Catalytic Oxidant water enhance Removal of CODcr about 20%


 


 


Continuous System

  - 2000 mg/L phenol in H2O
  - 200ppm sodium hypochlorite(NaOCl) solution
  - Phenol solution feeding rate = 2.02 mL / min
  - NaOCl solution feeding rate= 0.18 mL / min
  - Reaction volume = 500mL
  - Stirring rate = 300 rpm
  - O2 feeding rate = 20 mL / min
  - Reaction Volume of Catalytic Oxidation Tower = 60 mL
  - Catalyst volume(P1 : P2 : P3 = 1EA : 6EA : 3EA) = 18 mL


 

Item

 

Poilot plnat capacity

20m3

Catalyst amount

14 kg (P1 + P2 + P3)

NaOCl concentration

400 ppm

Operating time

10 days

Poliot plant location

Daegu dye industry

 

Results
 

  COD removal efficiency

    - Water Treated by catalyst : 22.0 %

    - Final effluent water : 82.3 %

  Color removal efficiency

   - Water Treated by catalyst : 14.6 %

   - Final effluent water : 43.8 %


 

 

Al

Co

Fe

K

Mg

Si

Ti

# 1

0.0585

0.00208

0.00432

0.2622

0.09166

0.3044

0.00892

# 2

0

0.0022

0.01532

0.2796

0.13036

0.2806

0.01092

# 3

0

0.00348

0.00108

0.3704

0.00512

0.213

0.04992

# 4

0

0.0032

0.00156

0.295

0.00446

0.2616

0.00862

# 5

0

0.0038

0.0014

0.3458

0.02248

0.3404

0.00832

# 6

0

0.00448

0.00232

0.3186

0.01074

0.3692

0.004076

# 7

0

0.00344

0.00288

0.1296

0.00408

0.4014

0.01186

# 8

0

0.00348

0.00204

0.3038

0.00872

0.3094

0.01222

# 9

0

0.00368

0.00316

0.336

0.01424

0.3722

0.01394

# 10

0

0.00384

0.00196

0.662

0.02338

0.3554

0.00754

NaOCl

 

0.00332

0.00092

0.1587

0.00454

0.5436

0.00136
 
>>> Leaching out test
      The catalyst didn’t leach out NaOCl solution