多级土壤渗滤系统处理低有机污染水的脱氮效果与机理解析
发布时间：2019-01-24 18:26
【摘要】：采用"微曝气+缺氧"的两段式多级土壤渗滤系统(multi-soil-layering system,MSL)工艺,建立了在缺氧段模块中添加不同碳源的MSL系统并进行脱氮效率对比.其中,MSL1系统添加了传统碳源木屑,MSL2系统添加了一种基于PHBV(聚羟基丁酸戊酸酯)的共混固相碳源(GC-4).通过10个月的连续运行,深入探讨碳源、水温、表面水力负荷等条件对该工艺脱氮性能的影响.整个运行过程期间不同条件影响下,添加新型固相碳源的MSL2比MSL1表现出更好的强化脱氮性能.在相同表面水力负荷(1.0 m3·m-2·d-1)条件下,水温的降低会直接降低系统的脱氮效率.当水温从平均19℃下降到15℃时,MSL1系统对NH+4-N、TN的平均去除率分别由91%、62%下降为81%、45%,MSL2系统对NH+4-N、TN的平均去除率分别由88%、72%下降为80%、55%,但MSL2系统仍然优于MSL1系统.水力负荷的降低会提高2个系统TN去除率大约20%,证明了低水力负荷利于系统的脱氮效果.在各个运行阶段,MSL系统添加固相碳源均没有出现碳源过度释放现象,表现出较好的COD去除效果.分子生物学研究揭示了两段式MSL系统中微生物、硝化菌、反硝化菌的功能分区及其丰度,在生物量和反硝化基因数量上MSL2均大于MSL1,硝化菌(amo A基因)集中分布在微曝气段,反硝化菌(nir S、nir K)集中分布在土壤模块层,比较好的解释了不同碳源类型条件下MSL系统的脱氮效果的差异性.
[Abstract]:A two-stage multistage soil leachate system (multi-soil-layering system,MSL) with "microaeration and hypoxia" was used to establish a MSL system with different carbon sources in the anoxic module and to compare the denitrification efficiency. Among them, the MSL1 system added the traditional carbon source wood chips, the MSL2 system added a kind of PHBV (polyhydroxybutyrate valerate) based blend solid phase carbon source (GC-4). The effects of carbon source, water temperature and surface hydraulic load on the denitrification performance of the process were discussed through 10 months of continuous operation. Under the influence of different conditions during the whole operation process, MSL2 with new solid carbon source showed better denitrification performance than MSL1. Under the same surface hydraulic load (1.0 m ~ 3 m ~ (-2) 路d ~ (-1), the decrease of water temperature will directly reduce the denitrification efficiency of the system. When the water temperature decreased from 19 鈩，
本文编号：2414708
[Abstract]:A two-stage multistage soil leachate system (multi-soil-layering system,MSL) with "microaeration and hypoxia" was used to establish a MSL system with different carbon sources in the anoxic module and to compare the denitrification efficiency. Among them, the MSL1 system added the traditional carbon source wood chips, the MSL2 system added a kind of PHBV (polyhydroxybutyrate valerate) based blend solid phase carbon source (GC-4). The effects of carbon source, water temperature and surface hydraulic load on the denitrification performance of the process were discussed through 10 months of continuous operation. Under the influence of different conditions during the whole operation process, MSL2 with new solid carbon source showed better denitrification performance than MSL1. Under the same surface hydraulic load (1.0 m ~ 3 m ~ (-2) 路d ~ (-1), the decrease of water temperature will directly reduce the denitrification efficiency of the system. When the water temperature decreased from 19 鈩，
本文编号：2414708
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