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Sulfur-based autotrophic denitrification from the micro-polluted water
Weili Zhou1, Xu Liu1, Xiaojing Dong1
1School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China.
Journal of Environmental Sciences (China)
|June 9, 2016
Summary
Autotrophic denitrification using thiosulfate as an electron donor effectively removes nitrogen from low C/N water bodies. This method, utilizing ceramsite carriers, proved feasible for treating micro-polluted lake water in pilot-scale experiments.
Area of Science:
- Environmental Science
- Water Treatment Engineering
- Microbiology
Background:
- Eutrophication, driven by excess nutrients, severely impacts lakes and reservoirs.
- Nitrogen removal from low C/N water bodies is critical for ecosystem health.
- Autotrophic denitrification presents a potential solution for nitrogen contamination.
Purpose of the Study:
- To investigate autotrophic denitrification using sulfur compounds as electron donors in biofilter reactors.
- To identify optimal sulfur compounds and carriers for efficient nitrogen removal.
- To evaluate the feasibility of this process for treating real micro-polluted lake water.
Main Methods:
- Laboratory-scale experiments were conducted using various sulfur compounds and carriers in biofilter reactors.
- Thiosulfate was identified as the optimal electron donor, and ceramsite as the preferred carrier.
- Optimum operating parameters were determined, followed by a pilot-scale experiment using West Lake water.
Main Results:
- Different sulfur compounds and carriers significantly impacted denitrification performance.
- Thiosulfate and ceramsite demonstrated superior denitrification efficiency, cost-effectiveness, and hydraulic load resistance.
- Pilot-scale tests confirmed the process's applicability to real micro-polluted lake water.
Conclusions:
- Autotrophic denitrification with thiosulfate is an effective method for nitrogen removal from low C/N water.
- Ceramsite is a suitable carrier material for this denitrification process.
- The investigated method is feasible and applicable for treating micro-polluted lake water, such as that from West Lake, China.
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