LIUChong,XUWei-yi,LIYu-guang,et al.Deep Denitrification of Cremation Flue Gas Absorption Wastewater Based on Sulfur Autotrophic Denitrification[J].China Water & Wastewater,2022,38(11):7-12.
Deep Denitrification of Cremation Flue Gas Absorption Wastewater Based on Sulfur Autotrophic Denitrification
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第11期
Page:
7-12
Column:
Date of publication:
2022-06-01
- Keywords:
- cremation flue gas; deep denitrification; autotrophic denitrification; sulfate; microbial community structure
- Abstract:
- Based on the sulfur autotrophic denitrification process, the deep denitrification process and control technology of cremation flue gas absorption wastewater were studied. It was found that nitrate removal could be increased to 89.0% within 30 days by gradually increasing the nitrate loading. Limestone could effectively substitute NaHCO3 to provide alkalinity, and thus the autotrophic denitrifying bacteria could perform stable nitrogen removal capacity. Compared with sulfate, nitrite showed obvious toxic inhibition effect on the autotrophic denitrifying bacteria. However, the removal efficiency of nitrate was higher than 93.2% when the functional flora adapted to the influent quality. Regular backwashing could prevent the occurrence of sulfur packing hardening, therefore, the system could maintain good nitrate removal performance. Thiobacillus sp. and Sulfrimonas sp. were the dominant species, and the relative abundance accounted for more than 70.5%, but the relative abundance of Sulfuricurvum sp. was significantly lower, mainly because Sulfuricurvum sp. could not reduce the nitrite.
Last Update:
2022-06-01