3.义乌市水处理有限责任公司,义乌 322001
1.Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.Yiwu Water Treatment Co. Ltd., Yiwu 322001, China
-N、低碳氮比的特点,难以实现低成本、高效率处理。以沸石为基质,设计了一种间歇性曝气垂直-潮汐流人工湿地用于处理养猪沼液,以期在高污染物负荷下实现短程硝化,为厌氧氨氧化提供合适底物。结果表明,系统在20 d左右启动短程硝化,出水
-N的吸附、系统结构及运行方式有助于实现高效的短程硝化。qPCR研究结果表明,系统中amoA丰度远高于nxrA丰度,证实亚硝酸盐氧化菌被抑制。以上研究结果可为人工湿地优化及其在养猪沼液处理中的应用提供参考。
The anaerobically-digested swine wastewater (ADSW) is characterized by the high concentration of
-N and low carbon/nitrogen ratio, making it a challenge to remove nitrogen with low-cost and high-efficiency. An intermittent aeration vertical-tidal flow constructed wetland (V-TFCW) employing zeolite as a substrate was designed to treat ADSW in order to achieve partial nitrification (PN) under high pollutant loading rate and provide suitable substrates for anammox. During the start-up stage, PN was successfully achieved within about 20 days, the
. During the stable operating stage, the
, and the nitrite accumulation rate was always higher than 90%, demonstrating the excellent PN performance of the V-TFCW. Furthermore, the effluent
-N ratio could meet the demand of anammox. PN was significantly inhibited due to the low temperature, while it improved obviously with the rise of temperature. Analysis of the PN mechanism showed that free ammonia inhibition and the strong pH buffer capacity of ADSW were vital to achieving PN in V-TFCW. Moreover, adsorption of
-N by zeolite, system structure, and operation mode contributed to the efficient PN. The qPCR data demonstrated that the abundances of amoA were much higher than those of nxrA in V-TFCW, confirming the inhibition of nitrite-oxidizing bacteria. This study provides references for the optimization of constructed wetland and its applications in the treatment of ADSW.
.
Schematic diagram of the experimental devices
-N removal efficiency in V-TFCW at different stages
V-TFCW在不同阶段ARR、NPR和NAR变化情况
Variations of ARR, NPR, and NAR in V-TFCW nitrification system at different stages
V-TFCW在不同阶段FA、FNA、pH和温度变化情况
Variations of FA, FNA, pH and temperature in V-TFCW at different stages
-N in V-TFCW effluent
Nitrogen functional gene abundance in different layers of V-TFCW
Influent and effluent quality of the coagulation pretreatment unit and V-TFCW at different stages
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