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Reduction of odors from a facultative pond using two different operating practices.
A Truppel1, J L M Camargos, R H R da Costa
1Fundação Nacional de Saúde de Santa Catarina, FUNASA-SC Rua Marinheiro Max Schramm, 2179 Estreito, Florianópolis, SC, CEP: 88095-001, Brazil. atruppel@terra.com.br
Summary
This study effectively reduced sewage odors using effluent recirculation and low-power aeration. This intervention significantly decreased hydrogen sulfide and ammonia emissions, improving environmental perception near the treatment works.
Area of Science:
- Environmental Engineering
- Wastewater Treatment
- Odor Control
Background:
- Sewage treatment works (STW) located near populated areas often emit unpleasant odors due to anaerobic conditions in facultative ponds.
- Odors from STW, primarily hydrogen sulfide (H2S) and ammonia (NH3), negatively impact surrounding communities.
- Effective odor management strategies are crucial for public health and environmental quality.
Purpose of the Study:
- To evaluate the effectiveness of two deodorization methods for a facultative pond STW.
- To assess the reduction in specific odor-causing gases (H2S and NH3) and overall odor perception.
- To investigate the impact of the intervention on the pond's planktonic community.
Main Methods:
- Implementation of effluent recirculation (1/6 flow) combined with low-power aeration.
- Chemical analysis of H2S and NH3 emissions.
- Olfactometric analysis and public environmental perception surveys.
- Investigation of the planktonic community structure.
Main Results:
- A significant reduction in odors was achieved through the combined intervention.
- H2S emissions decreased from 0.1345 mg/m3 to 0.0083 mg/m3.
- NH3 emissions decreased from 0.021 mg/m3 to 0.0073 mg/m3.
- Distinct differences in planktonic species were observed between odor-present and odor-absent conditions.
Conclusions:
- The combination of effluent recirculation and reduced-power aeration is an effective strategy for odor control at STW.
- The intervention leads to substantial reductions in key odorant gases, improving local environmental quality.
- Changes in the planktonic community suggest a correlation between water quality, odor levels, and microbial ecosystems.