Advanced nitrate removal in sulfur autotrophic denitrification biofilter under dissolved oxygen shock and low temperature enhanced by boron oxide and magnesium oxide: Hydrogen sulfide accumulation and regulation

被引：0

作者：

Jia, Qingliang ^{[1
]}

Li, Shiwen ^{[2
]}

Meng, Fangang ^{[3
]}

Zhang, Jian ^{[1
]}

Wang, Shengyuan ^{[2
]}

Su, Mengran ^{[1
]}

Jiang, Hao ^{[1
]}

机构：

[1] Shandong Univ Sci & Technol, Inst Yellow River Delta Earth Surface Proc & Ecol, Coll Safety & Environm Engn, Qingdao, Peoples R China

[2] Qingdao West Coast Publ Util Grp Water Co Ltd, Qingdao, Peoples R China

[3] Sun Yat Sen Univ, Guangdong Prov Key Lab Environm Pollut Control & R, Guangzhou, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2024年 / 371卷

关键词：

Sulfur autotrophic denitrification; Boron and magnesium; Seasonal temperature; H2S management; Air-water backwash;

D O I：

10.1016/j.jenvman.2024.123268

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Strengthening nitrate removal stability of sulfur autotrophic denitrification (SAD) under environmental stress is of great urgency. This study established a biofilter filled with S0-based filter material modified by boron oxide and magnesium oxide (FMSBMg). Hydrogen sulfide (H2S) accumulation reached 18.89 +/- 4.51 mg/L and 7.28 +/- 2.03 mg/L in summer and winter. Air and water backwash flow rates of 3 m3/h and 150 L/h could reduce H2S accumulation to below 0.16 mg/L under dissolved oxygen (DO) of 4.4 +/- 0.1 mg/L 0.4 +/- 0.1 mg/L B 3+ and 15.9 +/- 0.3 mg/L Mg2+ released from FM SBMg enhanced nitrate removal stability under DO shock and temperature drop. NO3--N eff reached 5.2 +/- 2.2 mg/L at 12.1 +/- 0.8 degrees C. Coexistence of NH4+-N and NO2--N provided substrates for in situ enrichment of Anammox bacteria. Thiobacillus, Lysobacter and Brocadia abundances accounted for 53.9%, 2.5% and 1.8% in biofilter, respectively. This study could provide theoretical basis for SAD biofilter application and H2S regulation.

引用

页数：12