WANGZe-chun,FENGJing-wei,ZHANGLiu,et al.Enhanced Denitrification of Constructed Wetland for Treatment of Sewage Treatment Plant Effluent by Sludge Fermentation Liquid[J].China Water & Wastewater,2023,39(15):23-33.
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Enhanced Denitrification of Constructed Wetland for Treatment of Sewage Treatment Plant Effluent by Sludge Fermentation Liquid

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第15期 Page: 23-33 Column: Date of publication: 2023-08-01
Author(s):
WANG　Ze-chun1;  FENG　Jing-wei1;  ZHANG　Liu2;  FAN　Chun-li1;  LIU　Le2;  SHI　Zhi-kong2
（1. Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources， School of Civil and Hydraulic Engineering， Hefei University of Technology， Hefei 230009， China； 2. Anhui Academy of Environmental Science and Research， Hefei 230071， China）
Keywords:
sewage treatment plant effluent;  enhanced denitrification;  constructed wetland;  sludge fermentation liquid;  enzymatic activity;  microbial community
Abstract:
The sludge fermentation liquid was used as additional carbon source of constructed wetland to enhance denitrification of sewage treatment plant effluent. The effects of sludge fermentation liquid dosage and flooding height on the pollutants removal in the constructed wetland were studied. The nitrogen transformation rate, the activities of various functional enzymes and the microbial community structure in the constructed wetland were measured. The results showed that the removal rate of TN in constructed wetland was only 34%-36% without adding sludge fermentation liquid. After adding sludge fermentation liquid, the removal rate of TN could reach 64%-78%. The removal rates of TP and COD in the experimental group with sludge fermentation liquid increased significantly compared with the wetland without sludge fermentation liquid (blank group). There was no significant difference in NO3--N concentration between the blank group and the experimental group. The accumulation of NO2--N in the sludge fermentation liquid group decreased significantly. The denitrification rate, nitrification rate, ammonia monooxygenase, nitrate reductase and nitrite reductase activities significantly increased by adding sludge fermentation liquid of 0.25%,0.5% and 0.75% (p<0.05). After adding 0.25%,0.5% and 0.75% sludge fermentation liquid, the relative abundance of Thauera with denitrifying function increased by 2.6%, 3.8% and 7.9% respectively. NO3--N and DO in constructed wetland significantly affected the microbial community.
Last Update: 2023-08-01