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Updated: Oct 8, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
Response difference of simultaneous sulfide and nitrite removal process to different cooling modes
Kaiquan Wang1, Mahmood Qaisar2, Bilong Chen1
1College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, PR China.
Step cooling enhances simultaneous sulfide and nitrite removal, promoting elemental sulfur formation. Sudden cooling shows higher sulfide oxidation and nitrite reduction rates, but step cooling better supports microbial community transformation.
Area of Science:
- Environmental microbiology
- Wastewater treatment technologies
Background:
- Simultaneous sulfide and nitrite removal is crucial for wastewater treatment.
- Optimizing temperature conditions is key to enhancing microbial processes in wastewater treatment.
Purpose of the Study:
- To investigate the impact of different cooling modes on simultaneous sulfide and nitrite removal.
- To evaluate the efficiency of sudden versus step cooling on microbial performance and sulfur transformation.
Main Methods:
- Comparative analysis of sudden cooling (25℃→10℃) and step cooling (25℃→20℃→15℃→10℃).
- Monitoring of sulfide and nitrite removal percentages and rates.
- Analysis of sulfur transformation products and microbial community diversity.
Main Results:
- Both cooling modes achieved 100% sulfide removal.
- Step cooling demonstrated higher sensitivity for nitrite removal (k = 0.06707) compared to sudden cooling (k = 0.02760).
- Step cooling increased elemental sulfur proportion to 79.90% and reduced microbial diversity, with Sulfurovum remaining dominant.
Conclusions:
- Cooling mode significantly influences nitrite removal efficiency and sulfur transformation pathways.
- Step cooling is more effective for promoting elemental sulfur production and altering microbial community structure in simultaneous sulfide and nitrite removal processes.
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