A comparative study on the enhanced operation of a BFB and SFCW coupling process for domestic wastewater treatment

[摘要] In this study, a new coupling process system of BFB (biological filter bed) and SFCW (subsurface-flow constructed wetland) based on the auto-ventilation network was proposed, and the comparative pollutant removal efficiency of the pilot test coupling system with different substrates configurations were investigated. The study found that: the influent concentration of the system fluctuated greatly and effluent concentration of the comparison system (b) was 20.22 ± 13.37 mg/L, 2.70 ± 2.49 mg/L, 4.40 ± 3.05 mg/L and 1.09 ± 0.62 mg/L, respectively. The comparison system (b) had better removal rates than that of the original system (a), which was 81.30 %, 90.28 %, 88.57 % and 75.36 % for CODcr, NH4 +-N, TN and TP, respectively. The removal of the above main water indexes of the comparison system (b) promoted to 4.20 %, 9.20 %, 7.66 % and 13.61 % respectively when compared to the original system (a), which showed that the optimized configuration of various kinds of substrates was significant and was more beneficial to the degradation and removal of pollutants. The adsorption and interception function of substrates in the constructed wetland was the main way of phosphorus removal. The function of auto-ventilation ensured the amount of DO in the coupling system, making the phosphorus removal was less affected comparing to structure of traditional wetland.

[发布机构] Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou; 310007, China^1;Zhejiang Hoken Architecture Design Institute Co. Ltd., Hangzhou; 310011, China^2;School of Geography and Environmental Science, Zhejiang Normal University, Jinhua Zhejiang; 321000, China^3

[效力级别] 经济学

[关键词] Constructed wetlands;Different substrates;Domestic waste water treatment;Effluent concentrations;Influent concentrations;Optimized configuration;Pollutant removal efficiency;Subsurface flow constructed wetlands