CATADOX Process | Esco International

New generation of Commercial Advanced Oxidation Processes for Water & Gas Treatment

Advanced oxidation processes (AOPs), uniting ozone and properly designed ultraviolet systems, in conjunction with hydrogen peroxide , may offer a powerful water treatment solutions for the reduction of undesirable organic compounds, COD and TOC.

AOP processes are successfully used to decompose many hazardous chemical compounds to acceptable levels, without producing additional hazardous by-products or sludge which require further handling. Advanced oxidation processes are the most reliable means of meeting the new industry standards, reduce wastes and offer substantial cost savings.

The development of AOPs is an attempt to produce the non-selective and rapid hydroxyl radical OH° to oxidize pollutants. The most widely applied conventional AOP systems has been the H2O2/UV, O3/UV, H2O2/O3 and H2O2/O3/UV processes.
Hydrogen peroxide and Ozone are added to the contaminated water and is activated by the UV light to form oxidizing species called hydroxyl radicals, via: O3/H2O2 + UV = (•OH)
The hydroxyl radical reacts with the dissolved contaminants, initiating a rapid cascade of oxidation reactions that ultimately fully oxidize (mineralizes) the contaminants.

New Commercial Advanced Oxidation Process

ESCO International has introduced a new commercial advanced oxidation process for the treatment of process water for semiconductor industries, pharmaceutical and biotechnology industries as well as many other manufacturing industries. This proprietary advanced oxidation process, referred to as the CATADOX process , can efficiently reduce TOC as well as many refractory organic contaminants in feed water or process water and will consistently reduce TOC to below 1 ppm for 100% water reuse or reclaim purposes, resulting is significant cost savings.

Process information

The CATADOX process was developed, designed and tested by ESCO International. The process combines treatment by ozone, UV, hydrogen peroxide and proprietary catalyst, resulting in a powerful advanced oxidation treatment system.

This innovative advanced oxidation process includes new improvements and system design optimisation.The new AOP system creates a more effective oxidative TOC reduction process compared to known conventional AOP processes.

The CATADOX, performs excellently in challenging applications such as non-biodegradable COD removal, TOC reduction, VOCs abatement, toxicity reduction, colour & odour removal, removes refractory organic compounds such as DMSO, TMAH, NMP, IPA (iso-propanol), THMs (Trihalomethanes) and Urea found in treated water and process water used in semiconductor applications.

The CATADOX system involves three main components for the effective generation & optimum use of hydroxyl free radicals for the enhanced oxidation of pollutants, COD and TOC:

1- ozone & hydrogen peroxide
2- H2O2/UV
3- oxidant(s) + proprietary catalyst

The CATADOX process provides unique benefits:

Significant cut down in ozone demand, hence smaller ozone generator
Important reduction in oxygen and dry air requirements, hence lower power consumption
Major reduction in cooling water capacity
Reduction in plant size
Higher flexibility in oxidants dosing vs incoming TOC or COD
Better process performance and reliability
Much lower overall power consumption
no oxidant residual problems
optimal combination of ozone, H2O2, UV available depending on water quality and requirements before discharge or reuse
lower ozone, H2O2 and UV power requirements when compared to conventional H2O2/UV, O3/UV and O3/H2O2 AOP processes.

AOP – CATADOX Pilot Plant

Technical specifications:

Wastewater feed flow rate range:   1-2 m3/h
Ozone generation capacity:   0-240 g/h
Ozone concentration range:   0 -120 ppm
Hydrogen peroxide concentration range: 0-100 ppm
UV oxidation power range:   0-1500 W
Oxidation contact chamber:   5.0 – 30.0 min

Utilities requirement:

Mains power 400V, 50-60HZ, 3Phase
Cooling water
Clean & Dry Air

Key benefits:

- On-site destruction treatment technology
- No phase transfer required, thereby eliminating secondary handling
- Efficient for a wide range of contaminants types and concentrations including IPA, TMAH, NMP, DMSO, Glycols, VOCs, PAHs, PCBs, Alcohols, Ethers, TOC & COD and others..
- Low maintenance and operating requirements
- Quiet and unobtrusive equipment
- Safe and environmentally friendly

Features:

- combination of advanced oxidation process (AOP) including ozone / UV / H2O2/Catalyst
- designed to mimic full scale plant operation
- mobile & self-contained plant
- high ozone dissolution and mass transfer performance
- pH correction of influent
- ozone generator
- integrated oxygen generating system
- vent ozone destruction
- dissolved ozone monitoring device

Advantages:

- allows experimentation with different loadings
- demonstrates effluent treatability
- enable you to conduct trials on your own site with the actual effluent to be treated
- establishes precise design parameters
- accurately predicts capital & operating costs

Recommendations:

If you are thinking of installing an on-site advanced oxidation plant for wastewater reclaim, it is sometimes necessary to carry out pilot studies to ensure that the correct design criteria are used for the full scale plant.
ESCO recommends that the pilot plant evaluation work is carried out for at least a week.

Applications ?

Advanced Oxidation Processes have a wide range of applications, mainly for the oxidative degradation of refractory organic compounds, TOC and COD reduction in:

. water reclaim / reuse / recycling
. drinking water supplies
. industrial & municipal wastewaters
. process water, ultra-pure water
. electronic & pharmaceutical industries
. mineral water and beverage industries
. public and private swimming pools,
. medicinal baths, sanatoriums, hospitals
. cooling water systems
. bottling & rinsing plants
. fish hatcheries and farm
. Gas effluent treatment

Want to know more ?

Tel: +44 (0)1492 584140
Fax: +44 (0)1492 580059
Email: info@escouk.com
Website: www.escouk.com