decreasing the non- biodegradable component of pulp & paper effluent, combining agar®...
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Decreasing the non- biodegradable component of Pulp & Paper effluent, combining AGAR® technology and Advanced Oxidation Processes (AOP)
Maital Helman Presented by: Ramiro Garza September 2014
IPN-ISRAEL WATER WEEK
Proprietary and confidential
Problem definition In certain industrial wastewater, the remaining non-biodegradables concentration
out of biological treatment exceed required effluents regulations
In thus cases the present practice would be either tertiary treatment or separate
discharge of specific streams
Israel India China Europe
COD < 100ppm
ZLD
COD < 700ppm COD < 160ppm Discharge to river
COD800-2000ppm - COD < 500ppm
Discharge to WWTP
COD < 150ppm - -Irrigation for agriculture
Examples of COD industrial effluents standards
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Pulp & Paper Industry The 3rd largest polluter in the US
The WW are contaminated with large quantities of
organic materials, which results with only 85-90%
of bd. COD
Due to the parallel efforts for reducing water usage in the process, the non-
biodegradable (NBD) fraction is increasing hence, compliance with effluent COD
standards becomes much more complicated
Increasing WW biodegradability might allow almost complete remove of COD
compounds and possible reuse of more WW
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Suggested Solution
The oxidation treatment is proposed for effluent biodegradability increase that
will than be reintroduce back to a biological treatment
Appropriate AOP technology will be adopted based on effluent characteristicsInlet
Air
Carriers
Outlet
FentonNiO
Recirculation
MBBR AOPRecirculation back to biological treatment
Inlet
Air
CarriersFenton
NiO
Air
Carriers
Outlet
MBBR AOP MBBRDischarged to second biological reactor
Combining AOP technologies with MBBR
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Advanced Oxidation Process (AOP)
1. Formation of strong oxidation agents (e.g. hydroxyl radicals)
2. Reaction between oxidants and organic compounds may result with
biodegradable intermediates
3. Optional - Reaction of biodegradable intermediates with oxidants referred to as
mineralization
The AOP involves several steps
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Fenton
Fenton is an oxidation reaction, developed
over a century ago, using hydrogen peroxide
and Iron sulfate at low pH of 2.5-3.5
The process is tested in a batch mode
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Nickel Oxide
Nickel oxide is a Catalyst for oxidation
processes for WW treatment
The Colonna contains granular catalyst, while
an Hydrogen peroxide is fed at different
concentrations to form the radicals
The pH inside the Colonna should be kept
>8.5
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Objectives Define optimal condition - applying Fenton reaction to reach higher
BOD/COD ratio
Define optimal condition - applying Nickel Oxide catalyst to reach
higher BOD/COD ratio
Performing Partial oxidation (15% removal of COD) to increase
biodegradability to 0.3
Results
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Fenton Increase in BOD/COD ratio obtained at different Fe+2 to H2O2 ratio, oxidizing 50
ppm COD, at different Fe+2-H2O2 ratios
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Fenton To evaluate the influence of pH correction, experiments were performed at pH
4 (after correction) and pH 8 (w/o correction) at Fe-H2O2 molar ratio of 1:10 and
oxidation of 50ppm COD at 35 ˚C
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Fenton Different COD level were oxidized
The influence of the COD con. that was to be oxidized, on biodegradability, was
evaluated
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Nickel oxide Influence of H2O2 concentration on the increase in BOD/COD ratio between time
zero and at the end of the experiment
Summary & Conclusions
Proprietary and confidential
Conclusions Increase in BOD/COD ratio was exhibited in all tested system,
for both NiO and Fenton reactions
Fenton’s reagent was succeeding to maintain high removal percentage at different Peroxide concentration
Using Nickel oxide catalyst, optimal operation conditions are with 0.05% oxidizer concentration and 60°C
Average COD Removal Rate in Nickel oxide & Fenton experiments were 26% and 15%, respectively.
Q A
Contact InformationContact us for further information about Aqwise solutions
Maital HelmanR&D Engineer
Websitewww.aqwise.com
Telephone+972-9-9591901