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Effect of exogenous CaO addition on H
Hang Li1, Hongjie Wang2, Xianglong Yang1
1Hebei Key Laboratory of close-to-Nature restoration technology of wetlands, School of Eco-Environment, Hebei university, Baoding 071002, China; Institute of Xiong'an New Area, Hebei university, Baoding 071002, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Adding calcium oxide (CaO) to waste activated sludge (WAS) significantly reduces hydrogen sulfide (H2S) production during anaerobic fermentation. This method offers a promising solution for odor control in wastewater treatment.
Area of Science:
- Environmental Science
- Biotechnology
Background:
- Odor emission from waste activated sludge (WAS) during anaerobic fermentation is primarily caused by hydrogen sulfide (H2S) production.
- Calcium oxide (CaO) is known to enhance resource recovery from WAS, but its impact on H2S generation is not well understood.
Purpose of the Study:
- To investigate the effect of CaO addition on H2S production in anaerobic fermentation of WAS.
- To elucidate the underlying mechanisms responsible for any observed changes in H2S production.
Main Methods:
- Addition of 60 mg/g VSS CaO to WAS undergoing anaerobic fermentation.
- Analysis of H2S yield, sludge structure, organic matter release, and microbial community composition.
- Investigation of sulfur-containing organic matter transformation and sulfate reduction pathways.
Main Results:
- CaO addition significantly inhibited H2S production by up to 60.1%.
- CaO disrupted sludge structure, releasing intracellular organic matter, and promoted H+ and S2- consumption.
- Microbial analysis revealed a reduction in hydrolytic microorganisms, sulfate-reducing bacteria (SRBs), and key genes involved in sulfur metabolism.
Conclusions:
- CaO effectively suppresses H2S production in WAS anaerobic fermentation by altering sludge properties and microbial communities.
- The findings provide valuable insights for practical applications of CaO in mitigating odor issues in wastewater treatment.
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