采用厌氧反应器接种厌氧氨氧化污泥,研究了脱氮效能提高过程中颗粒污泥的沉淀性能及不同策略对增强颗粒污泥沉淀性的影响。结果表明:当反应器氮去除速率达到3.2 kg m-3 d-1时,产气量的增加使得颗粒污泥出现大量流失。采用"粉碎-回...采用厌氧反应器接种厌氧氨氧化污泥,研究了脱氮效能提高过程中颗粒污泥的沉淀性能及不同策略对增强颗粒污泥沉淀性的影响。结果表明:当反应器氮去除速率达到3.2 kg m-3 d-1时,产气量的增加使得颗粒污泥出现大量流失。采用"粉碎-回流-重新形成颗粒污泥"方式不能完全有效地改善颗粒污泥的沉降性能。通过对反应器内和流失的污泥进行测定发现,相同粒径的反应器内颗粒污泥的MLVSS/MLSS值要明显低于流失的颗粒污泥。通过CaSO4颗粒投加,回流的流失污泥会以CaSO4作为颗粒污泥的核。经过48 d的培养,污泥的沉降性能得到良好的改善,反应器氮去除速率从5.23 kg m-3 d-1上升到9.2 kg m-3 d-1。同时该研究还发现当进水总氮浓度达到1320 mg L-1时,厌氧氨氧化颗粒污泥活性并未受到影响,说明厌氧氨氧化颗粒污泥对进水基质浓度具有较强的耐受性。展开更多
In this study, a lab-scale upflow anaerobic sludge blanket(UASB) reactor was applied to studying the high-rate nitrogen removal of granule-based anammox process. The nitrogen removal rate(NRR) finally improved to 15.7...In this study, a lab-scale upflow anaerobic sludge blanket(UASB) reactor was applied to studying the high-rate nitrogen removal of granule-based anammox process. The nitrogen removal rate(NRR) finally improved to 15.77 kg/m3/d by shortening hydraulic retention time(HRT) to 1.06 h. Well-shaped red anammox granules were extensively enriched inside the reactor. The results of nitrogen removal kinetics indicated that the present bioreactor has great nitrogen removal potential, because the maximum rate of substrate utilization(Umax) predicted by Stover-Kincannon model is suggested as 55.68 kg/(m3·d). Analysis of the microbial community showed that the anammox genus Candidatus Kuenenia dominated the bacterial communities. The relative abundance of Candidatus Kuenenia rose from 12.29% to 36.95% after progressively shorter HRT and higher influent substrate concentrations, illustrating the stability of nitrogen removal performance and biomass enrichment offered by the UASB in carrying out high-rate anammox process.展开更多
文摘采用厌氧反应器接种厌氧氨氧化污泥,研究了脱氮效能提高过程中颗粒污泥的沉淀性能及不同策略对增强颗粒污泥沉淀性的影响。结果表明:当反应器氮去除速率达到3.2 kg m-3 d-1时,产气量的增加使得颗粒污泥出现大量流失。采用"粉碎-回流-重新形成颗粒污泥"方式不能完全有效地改善颗粒污泥的沉降性能。通过对反应器内和流失的污泥进行测定发现,相同粒径的反应器内颗粒污泥的MLVSS/MLSS值要明显低于流失的颗粒污泥。通过CaSO4颗粒投加,回流的流失污泥会以CaSO4作为颗粒污泥的核。经过48 d的培养,污泥的沉降性能得到良好的改善,反应器氮去除速率从5.23 kg m-3 d-1上升到9.2 kg m-3 d-1。同时该研究还发现当进水总氮浓度达到1320 mg L-1时,厌氧氨氧化颗粒污泥活性并未受到影响,说明厌氧氨氧化颗粒污泥对进水基质浓度具有较强的耐受性。
基金Project(51878662)supported by the National Natural Science Foundation of ChinaProject(2017SK2420)supported by the Science and Technology of Hunan Province,ChinaProject(2019JJ20033)supported by the Distinguished Youth Natural Science Foundation of Hunan Province,China。
文摘In this study, a lab-scale upflow anaerobic sludge blanket(UASB) reactor was applied to studying the high-rate nitrogen removal of granule-based anammox process. The nitrogen removal rate(NRR) finally improved to 15.77 kg/m3/d by shortening hydraulic retention time(HRT) to 1.06 h. Well-shaped red anammox granules were extensively enriched inside the reactor. The results of nitrogen removal kinetics indicated that the present bioreactor has great nitrogen removal potential, because the maximum rate of substrate utilization(Umax) predicted by Stover-Kincannon model is suggested as 55.68 kg/(m3·d). Analysis of the microbial community showed that the anammox genus Candidatus Kuenenia dominated the bacterial communities. The relative abundance of Candidatus Kuenenia rose from 12.29% to 36.95% after progressively shorter HRT and higher influent substrate concentrations, illustrating the stability of nitrogen removal performance and biomass enrichment offered by the UASB in carrying out high-rate anammox process.
