Dimethyl sulfide (DMS) can be effectively removed through a sophisticated combined treatment approach that integrates advanced oxidation processes with biological degradation. This method primarily utilizes non-thermal plasma (NTP) for initial breakdown, followed by enhanced biological degradation.
Combined Non-Thermal Plasma (NTP) and Biological Treatment
This innovative system leverages the strengths of both physical-chemical oxidation and microbial activity to thoroughly break down DMS, ensuring high removal efficiency.
1. Initial Oxidation with Non-Thermal Plasma (NTP)
The first step in this integrated process involves the application of non-thermal plasma. NTP acts as a powerful oxidant, initiating the degradation of DMS.
- Direct Oxidation: The plasma directly oxidizes dimethyl sulfide into simpler organic compounds. These initial products often include substances such as methanol and carbonyl sulfide. This step effectively breaks the more complex DMS molecule into smaller, more manageable forms.
- Ozone Generation: A crucial benefit of NTP application is the generation of ozone. This ozone is not just a byproduct; it plays a vital role in enhancing the subsequent biological treatment stage.
2. Enhanced Biological Degradation in a Biological Trickling Filter (BTF)
Following the NTP treatment, the partially oxidized compounds and any remaining DMS are channeled into a biological trickling filter (BTF). This stage relies on the activity of microorganisms to complete the degradation process.
- Microbial Community Activation: The ozone produced by the non-thermal plasma significantly influences the microbial community within the BTF. It makes the community more complicated and active, boosting its efficiency in breaking down pollutants.
- Complete Conversion: The enhanced microbial activity ensures that the intermediate organic products (like methanol and carbonyl sulfide) generated by the NTP, along with any unreacted DMS, are further oxidized. This biological degradation transforms them into stable and less harmful end products, primarily sulfate, carbon dioxide, and water vapor.
Advantages of This Integrated System
This combined approach offers several benefits for DMS removal:
- High Efficiency: It synergistically combines rapid chemical breakdown (NTP) with sustained biological purification, leading to high removal rates.
- Comprehensive Treatment: Ensures the complete transformation of not just DMS but also its intermediate byproducts, preventing the release of other harmful compounds.
- Enhanced Bioactivity: The pre-treatment with NTP, particularly its ozone generation, primes and activates the biological component, making it more robust and effective.
