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Enhanced biological S0 accumulation by using signal molecules during simultaneous desulfurization and denitrification.
Imran, Muhammad A; Li, Xiumin; Yang, Zhengli; Xu, Jinlan; Han, Lixin.
Affiliation
  • Imran MA; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
  • Li X; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, People's Republic of China.
  • Yang Z; Key Laboratory of Environmental Engineering, People's Republic of China.
  • Xu J; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
  • Han L; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, People's Republic of China.
Environ Technol ; 44(6): 841-852, 2023 Feb.
Article in En | MEDLINE | ID: mdl-34559602
A high rate of elemental sulfur (S0) accumulation from sulfide-containing wastewater has great significance in terms of resource recovery and pollution control. This experimental study used Thiobacillus denitrificans and denitrifying bacteria incorporated with signal molecules (C6 and OHHL) for simultaneous sulfide (S2-) and nitrate (NO3-) removal in synthetic wastewater. Also, the effects on S0 accumulation due to changes in organic matter composition and bacteria proportion through signal molecules were analyzed. The 99.0% of S2- removal and 99.3% of NO3- was achieved with 66% of S0 accumulation under the active S2- removal group. The S0 accumulation, S2- and NO3- removal mainly occurred in 0-48 h. The S0 accumulation in the active S2- removal group was 2.0-6.3 times higher than the inactive S2- removal groups. In addition, S0/SO42- ratio exhibited that S0 conversion almost linearly increased with reaction time under the active S2- removal group. The proportion of Thiobacillus denitrificans and H+ consumption showed a positive correlation with S0 accumulation. However, a very high or low ratio of H+/S0 is not suitable for S0 accumulation. The signal molecules greatly increased the concentration of protein-I and protein-II, which resulted in the high proportion of Thiobacillus denitrificans. Therefore, high S0 accumulation was achieved as Thiobacillus denitrificans regulated the H+ consumption and electron transfer rate and provided suppressed oxygen environment. This technology is cost-effective and commercially applicable for recovering S0 from wastewater.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Thiobacillus / Wastewater Language: En Journal: Environ Technol Journal subject: SAUDE AMBIENTAL / TOXICOLOGIA Year: 2023 Document type: Article Country of publication:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Thiobacillus / Wastewater Language: En Journal: Environ Technol Journal subject: SAUDE AMBIENTAL / TOXICOLOGIA Year: 2023 Document type: Article Country of publication: