人工湿地外加碳源碳溶出及反硝化效果研究

Research on the dissolution of extra carbon source and denitrification effect in the constructed wetlands

关键词:  人工湿地  反硝化脱氮  外加碳源  碳溶出

Key words:  constructed wetlands  denitrification remove nitrogen  external carbon source  carbon dissolution

摘要:

为了解人工湿地中固体外加碳源的碳溶出规律及添加量对反硝化效果的影响，本研究选择竹子、木块和木本泥炭作为外加C源材料，在厌氧下测定3种材料的碳溶出量，同时应用于人工湿地中试试验，为人工湿地外加碳源的应用提供依据。结果表明：单位质量的试验材料C的溶出量是竹子＞木块＞木本泥炭，竹子、木块和木本泥炭的C溶出量均值分别达577、266 和59 mg/（kg·d）；材料C溶出量随时间变化的回归曲线拟合度较高，溶出稳定。人工湿地中试试验中，添加62 kg木块为外加碳源时的湿地系统对总氮和铵氮的去除率明显高于添加31 kg木块的湿地系统。溶出试验中木块作为人工湿地反硝化脱氮的外加碳源材料促进了人工湿地对氮的去除。

Abstract:

The aim of this study was to investigate the carbon (C) dissolution regularities of solid C source and the effects of additional C on denitrification in constructed wetland (CW) Bamboo,wood chips,and woody peat were selected as additional C sources to test C dissolution under anaerobic condition and be used in CW for primary testing to provide application basis.The results showed that: the amount of unit mass materials C dissolution was: bamboo>wood chips>woody peat;The average C dissolution was 577,266 and 59 mg/(kg·d),respectively;The regression equation of C dissolution rate with time showed the fitting of higher degree,while the C dissolution was stabilized.The testing system with additional 62 kg wood chips displayed the higher total nitrogen and ammonium removal rate than the system with additional 31 kg C.In conclusion,it is found that the application of wood chips as CW denitrification extra C materials promoted nitrogen removal.