环境工程学报2018，Vol.12Issue(4)：1022-1032,11.DOI:10.12030/j.cjee.201710077
MTF-CWs工艺对剩余污泥厌氧消化液的强化脱氮效果
Performance of MTF-CWs process in enhanced nitrogen removal from excess sludge anaerobic digester liquids
摘要
Abstract
Multi-stage tidal flow constructed wetlands(MTF-CWs) was employed to treat the excess sludge anaerobic digesting liquids(ES-ADL) in a wastewater treatment plant,which was conducted under vertical tidal-flow mode to enhance nitrification,and two operating cases were set by the influent concentration of NH4+-N and TN.In operation case 1,when the influent concentration of COD,NH4+-N and TN was (293.68 ± 9.62),(845.70 ± 11.53) and (847.00 ± 11.47) mg·L-1,the effluent concentration of COD,NH4+-N and TN was (84.47 ± 8.10),(8.81 ± 1.74) and (351.50 ± 7.78) mg·L-1,and the corresponding average removal efficiency of COD,NH4+-N and TN reached 72.45％,98.93％ and 56.48％,respectively.In operational case 2,when the influent concentration of COD,NH4+-N and TN was (413.31 ± 7.47),(1 023.85 ± 8.32) and (1 025.78 ± 8.31) mg·L-1,the effluent concentration of COD,NH4+-N and TN was (51.60 ± 6.05),(9.58 ± 3.13) and (359.92 ± 7.68) mg·L-1,and the corresponding average removal efficiency of COD,NH4+-N and TN reached 87.34％,99.50％ and 64.68％.Under these two cases,MTF-CWs decreased 58.50％ and 62.19％ nitrogen accumulation caused by ES-ADL recycling,respectively.The calculation results of consumption of oxygen indicated that the removal of NH4+-N did not use up the demand dissolved oxygen of whole nitrification or shortcut nitrification.The calculation results of carbon balance indicated that 86.30％ and 82.53％ nitrogen loads,respectively,were removed by other nitrification-denitrification pathways under two operating cases.Miseq high-throughput sequencing was employed to analyze the microbial communities,large quantities of anaerobic ammonium oxidation bacteria Candidatus Kuenenia were found in the wetland unit which contributed most in denitrification,the ratio of Candidatus Kuenenia increased as the depth of sampling increased (5.08％ to 13.18％),which substantiated the existence of anaerobic ammonium oxidation pathways during treating excess sludge digester liquids with application of MTF-CWs.关键词
人工湿地/剩余污泥厌氧消化液/硝化/自养反硝化/高通量测序Key words
constructed wetlands/excess sludge digester liquids/nitrification/denitrification/high-throughput sequencing分类
资源环境引用本文复制引用
苏光曦,杨永哲,张雷,方进宾,程果..MTF-CWs工艺对剩余污泥厌氧消化液的强化脱氮效果[J].环境工程学报,2018,12(4):1022-1032,11.基金项目
陕西省重点科技创新团队计划(2017KCT-19-01) （2017KCT-19-01）
高等学校博士学科点专项科研基金(20116120110008) （20116120110008）
