Decreasing the non- biodegradable component of Pulp & Paper effluent, combining AGAR® technology and Advanced Oxidation Processes (AOP) Maital Helman Presented.

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

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 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

Proprietary and confidential

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

Proprietary and confidential

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

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

Results

Proprietary and confidential

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

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

[email protected]

Maital HelmanR&D Engineer

Websitewww.aqwise.com

Telephone+972-9-9591901