title: Mixed sulfur-iron particles packed reactor for simultaneous advanced removal of nitrogen and phosphorus from secondary effluent.
abstract: A mixed sulfur-iron particles packed reactor (SFe reactor) was developed to simultaneously remove total nitrogen (TN) and total phosphorus (TP) of the secondary effluent from municipal wastewater treatment plants. Low effluent TN (<1.5 mg/L) and TP (<0.3 mg/L) concentrations were simultaneously obtained, and high TN removal rate [1.03 g N/(L·d)] and TP removal rate [0.29 g P/(L·d)] were achieved at the hydraulic retention time (HRT) of 0.13 h. Kinetic models describing denitrification were experimentally obtained, which predicted a higher denitrification rate [1.98 g N/(L·d)] of SFe reactor than that [1.58 g N/(L·d)] of sulfur alone packed reactor due to the mutual enhancement between sulfur-based autotrophic denitrification and iron-based chemical denitrification. A high TP removal obtained in SFe reactor was attributed to chemical precipitation of iron particles. Microbial community analysis based on 16S rRNA revealed that autotrophic denitrifying bacteria Thiobacillus and Sulfuricella were the dominant genus, indicating that autotrophic denitrification played important role in nitrate removal. These results indicate that sulfur and iron particles can be packed together in a single reactor to effectively remove nitrate and phosphorus.
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, People's Republic of China.
authors: Shenghui
authors: S
authors: Wang
authors: Peng
authors: P
authors: Liang
authors: Zhongqin
authors: Z
authors: Wu
authors: Fengfeng
authors: F
authors: Su
authors: Lulu
authors: L
authors: Yuan
authors: Yanmei
authors: Y
authors: Sun
authors: Qing
authors: Q
authors: Wu
authors: Xia
authors: X
authors: Huang
mesh_terms: D020562:Betaproteobacteria / Q000235:genetics; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D058085:Iron Compounds / Q000737:chemistry*; D058889:Molecular Typing; D009566:Nitrates / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013457:Sulfur Compounds / Q000737:chemistry*; D013855:Thiobacillus / Q000235:genetics; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D058085:Iron Compounds; D009566:Nitrates; D010758:Phosphorus; D012336:RNA, Ribosomal, 16S; D013457:Sulfur Compounds; D062065:Wastewater