ipn-israel water week

Report
IPN-ISRAEL WATER WEEK
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
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
Examples of COD industrial effluents standards
Europe
China
Discharge to
river
COD < 160ppm
COD < 700ppm
Discharge to
WWTP
COD < 500ppm
-
Irrigation for
agriculture
-
-
India
Israel
COD < 100ppm
ZLD
COD
800-2000ppm
COD < 150ppm
Proprietary and confidential
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 nonbiodegradable (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
Proprietary and confidential
Suggested Solution
Combining AOP technologies with MBBR
 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 characteristics
Inlet
Inlet
Outlet
Fenton
NiO
Carriers
Fenton
NiO
Carriers
Outlet
Carriers
Air
Air
Air
Recirculation
MBBR
AOP
Recirculation back to biological treatment
MBBR
AOP
MBBR
Discharged to second biological reactor
Proprietary and confidential
Advanced Oxidation Process (AOP)
The AOP involves several steps
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
Proprietary and confidential
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
Proprietary and confidential
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
Proprietary and confidential
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
Proprietary and confidential
Results
Fenton
 Increase in BOD/COD ratio obtained at different Fe+2 to H2O2 ratio, oxidizing 50
ppm COD, at different Fe+2-H2O2 ratios
Proprietary and confidential
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
Proprietary and confidential
Fenton
 Different COD level were oxidized
 The influence of the COD con. that was to be oxidized, on biodegradability, was
evaluated
Proprietary and confidential
Nickel oxide
 Influence of H2O2 concentration on the increase in BOD/COD ratio between time
zero and at the end of the experiment
Proprietary and confidential
Summary & Conclusions
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.
Proprietary and confidential
Q A
Contact Information
Contact us for further information about Aqwise solutions
Maital Helman
R&D Engineer
Email
Telephone
Website
[email protected]
+972-9-9591901
www.aqwise.com

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