Advanced Oxidation Processes (AOP)

Elimination of chelates in industrial wastewater

Advanced oxidation process for wastewater treatment of chelates

We destroy organic complexing agents in wastewater by means of UV process technology so that previously complexed metals can be treated after our advanced oxidation process without any problems in the existing wastewater treatment plant. This allows the customer to use new processes without the need for expensive investments in the expansion of the wastewater treatment plant.The COD of the respective waste water is degraded by a treatment with an AOP (Advanced Oxidation Process) to a defined point in order to be able to comply with specific limit values.In the course of this, the complexing agents contained in the waste water are oxidized, so that the UV plant technology is used in many cases as a pre-treatment stage before further treatment (for example precipitation).
In the case of "electroless nickel", in addition to the complexing agents, the reduced phosphorus oxides, such as hypo-phosphite and ortho-phosphite, can be converted into precipitable phosphate by means of UV oxidation. Tailor-made processes for applications with complex wastewater are developed by enviolet GmbH itself and have been successfully implemented for many years.
The UV systems used for this purpose can be designed both as UV batches and as UV flow-through systems. The overall economic concept comes first for the process choice of the UV process technology.


Degradation of organic chelates on the small and big scale

State of the art treatment of industrial wastewater by advanced oxidation processes (UV-Oxidation)

Typical applications:
  - Surface technology (treatment of rinsing waters and concentrates)
  - Chemical industry
  - Electronic industry
  - Semiconductor industry

Typical wastewater:
  - Electroless copper, baths and waste water (EDTA, tartaric acid, ...)
  - Electroless nickel, baths and waste water (citric acid, tartaric acid, lactic acid, ...)
  - TSAA wastewater and baths (tartaric acid)
  - Zinc-nickel wastewater and carbonate freezings (Polyaminocaboxylates, EDA, EDTA, PEDA, ...)
  - Phosphonate-containing wastewater (Polyphosphonates, ...)
  - Cyanide-containing wastewater (more information can be found here: Cyanomat®)
  - TriChrom (hard chelates can only be degraded by strongly oxidizing processes)

Theoretical fundamentals for the treatment of complexing agent-containing wastewater by means of UV oxidation can be found on our homepage on the basis of the cyanide oxidation.
 - Chemistry of the reaction
 - Advantages over a treatment with sodium hypochlorite
 - Application examples
 - References

Publications, case studies and further references can be found in the section "Treatment of Chelate Wastewater in Plating and PCB-Industry" in our publication list.

In order to optimally advise you on such applications based on a well-founded basis of interpretation, we offer individualized feasibility studies.