Effect of step-feeding on the performance of lab-scale columns simulating vertical flow-horizontal flow constructed wetlands

被引：30
作者：
Torrijos, Veronica [1 ]
Ruiz, Isabel [1 ]
Soto, Manuel [1 ]
机构：
[1] Univ A Coruna, Dept Chem, Rua Fraga 10, La Coruna 15008, Galiza, Spain
来源：
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2017年 / 24卷 / 28期
关键词：
Hybrid constructed wetlands; Vertical flow; Horizontal flow; Step-feeding; Nitrogen removal; WASTE-WATER TREATMENT; BIOLOGICAL NITROGEN REMOVAL; ANAEROBIC DIGESTERS; OXYGEN-TRANSFER; ORGANIC-MATTER; ALUM SLUDGE; EMISSION; RECIRCULATION; AERATION; METHANE;
D O I：
10.1007/s11356-017-9925-1
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effect of step-feeding (untreated wastewater by-pass) on the performance of lab-scale columns simulating a hybrid vertical flow (VF)-horizontal flow (HF) constructed wetland (CW) system was studied. Step-feeding strategies have been adopted in several kinds of CW, but this is the first report about the use of step-feeding in VF + HF hybrid systems treating domestic wastewater. Applied loading rates were 7-11 g BOD5/m(2) day and 2.1-3.4 g TN/m(2) day (overall system). Removal efficiency reached 98% TSS and COD and 99% BOD5 on average, whilst a 50% by-pass improved TN removal from 31 to 50%. Maximum surface nitrification rate (5.5 g N/m(2) day) was obtained in VF unit, whilst maximum denitrification rate (1.8 g N/m(2) day) was observed in HF unit. Referred to the overall system, maximum surface nitrification and denitrification rates were 2.2 and 1.6 g N/m(2) day, respectively. However, potential nitrifying and denitrifying activities (batch assays) were 15.0 and 58.9 g N/m(2) day, respectively. Even at 50% by-pass, operational conditions in HF unit (dissolved oxygen, redox, COD/TN ratio) were not suitable enough for denitrification. However, methane emissions were not observed and nitrous oxide emissions were relatively low.
引用
收藏
页码：22649 / 22662
页数：14
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