【摘要】：采用"微曝氣+缺氧"的兩段式多級土壤滲濾系統(tǒng)(multi-soil-layering system,MSL)工藝,建立了在缺氧段模塊中添加不同碳源的MSL系統(tǒng)并進行脫氮效率對比.其中,MSL1系統(tǒng)添加了傳統(tǒng)碳源木屑,MSL2系統(tǒng)添加了一種基于PHBV(聚羥基丁酸戊酸酯)的共混固相碳源(GC-4).通過10個月的連續(xù)運行,深入探討碳源、水溫、表面水力負荷等條件對該工藝脫氮性能的影響.整個運行過程期間不同條件影響下,添加新型固相碳源的MSL2比MSL1表現出更好的強化脫氮性能.在相同表面水力負荷(1.0 m3·m-2·d-1)條件下,水溫的降低會直接降低系統(tǒng)的脫氮效率.當水溫從平均19℃下降到15℃時,MSL1系統(tǒng)對NH+4-N、TN的平均去除率分別由91%、62%下降為81%、45%,MSL2系統(tǒng)對NH+4-N、TN的平均去除率分別由88%、72%下降為80%、55%,但MSL2系統(tǒng)仍然優(yōu)于MSL1系統(tǒng).水力負荷的降低會提高2個系統(tǒng)TN去除率大約20%,證明了低水力負荷利于系統(tǒng)的脫氮效果.在各個運行階段,MSL系統(tǒng)添加固相碳源均沒有出現碳源過度釋放現象,表現出較好的COD去除效果.分子生物學研究揭示了兩段式MSL系統(tǒng)中微生物、硝化菌、反硝化菌的功能分區(qū)及其豐度,在生物量和反硝化基因數量上MSL2均大于MSL1,硝化菌(amo A基因)集中分布在微曝氣段,反硝化菌(nir S、nir K)集中分布在土壤模塊層,比較好的解釋了不同碳源類型條件下MSL系統(tǒng)的脫氮效果的差異性.
[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，

本文編號：2414708