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Sulfide elimination by intermittent nitrate dosing in sewer sediments
Yanchen Liu1, Chen Wu1, Xiaohong Zhou1
1School of Environment, Tsinghua University, Beijing 100084, China.
Journal of Environmental Sciences (China)
|January 20, 2015
Summary
Intermittent nitrate dosing effectively controls hydrogen sulfide accumulation in sewer sediments, preventing pipe corrosion and health risks. Optimal conditions involve a specific nitrate-to-sulfide ratio for efficient sulfide elimination.
Area of Science:
- Environmental Engineering
- Microbiology
- Wastewater Treatment
Background:
- Hydrogen sulfide (H2S) formation in sewer systems causes significant pipe corrosion and health hazards.
- Current H2S prevention programs are often expensive and require substantial resources.
Purpose of the Study:
- To propose a novel control strategy for sulfide elimination in sewer sediments using intermittent nitrate dosing.
- To determine the optimal conditions for this intermittent nitrate dosing strategy.
Main Methods:
- Lab-scale experiments were conducted using real sewer sediments.
- Batch tests were performed to investigate intermittent nitrate dosing modes and optimal control parameters.
Main Results:
- Intermittent nitrate dosing proved advantageous for controlling sulfide accumulation in sewer sediments.
- Oxidation-reduction potential was identified as a sensitive indicator of control effectiveness.
- A minimum nitrate/sulfide (N/S) ratio with slight nitrate excess is necessary for efficient sulfide control and reduced carbon source loss.
Conclusions:
- The proposed intermittent nitrate dosing strategy is a feasible and effective method for sulfide elimination in sewer systems.
- Optimizing the N/S ratio and monitoring oxidation-reduction potential are key to successful implementation.
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