Nitrogen removal in domestic wastewater. Effect of nitrate recycling and COD/N ratio

被引:70
|
作者
Pelaz, L. [1 ]
Gomez, A. [2 ]
Letona, A. [2 ]
Garralon, G.
Fdz-Polanco, M. [1 ]
机构
[1] Univ Valladolid, Escuela Ingn Ind, Dept Chem Engn & Environm Technol, C Dr Mergelina S-N, E-47011 Valladolid, Spain
[2] CADAGUA SA, Gran Via 45-7, Bilbao 48011, Spain
关键词
Biological nutrient removal (BNR); C/N ratio; Denitrification; Nitrification; Organic matter; WASTE-WATER TREATMENT; SEQUENCING BATCH REACTOR; MEMBRANE BIOREACTOR; NUTRIENT REMOVAL; DENITRIFICATION; NITRIFICATION; PERFORMANCE; PHOSPHORUS; BIOFILTERS; EFFLUENT;
D O I
10.1016/j.chemosphere.2018.08.052
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A denitrification/nitrification pilot plant was designed, built and put into operation, treating the effluent of an anaerobic reactor. The operation of the plant examined the effect of the nitrate recycling and the COD/N ratio on the nitrogen and the remaining organic matter removal at 18 degrees C. The system consisted of a two-stage treatment process: anoxic and aerobic. The hydraulic retention time (HRT) of the system was 1 h for the anoxic bioreactor and 2 h for the aerobic one. The increase in the nitrate recycling ratio did not cause a significant improvement in the nitrogen removal due to the insufficient carbon source. The wastewater to be treated had a C/N ratio of 1.1 showing a lack of organic carbon. The addition of methanol was a key point in the denitrification process used as a model for the traditional wastewater by-pass in the WWTP. The maximum nitrogen and organic matter removal (87.1% and 96%, respectively) was achieved with a nitrate recycling ratio of 600% and a C/N of 8.25, adjusted by methanol addition. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:8 / 14
页数:7
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