摘要
针对低氨氮废水单级自养脱氮系统副产物硝氮残留,有机物耐受能力差,以及缺乏除磷功能等问题,提出反硝化除磷(Denitrifying Phosphorus Removal,DPR)-单级自养脱氮(Simultaneous Partial Nitrification,Anaerobic Ammonium Oxidation and Denitrification,SNAD)组合处理技术,重点考察氨氮负荷对单级自养脱氮工艺(Single-stage Nitrogen Removal Using Anammox And Partial Nitritation,SNAP)系统、泥龄对DPR系统构建的影响,以及低氨氮废水DPR-SNAD组合处理系统的脱氮除磷效能与微生物种群。研究结果显示:采用氨氮质量浓度梯度递减方式,氨氮负荷为0.20 kg N/(m^(3)·d)的低氨氮质量浓度的SNAP系统构建时间为63 d,较负荷为0.05 kg N/(m^(3)·d)的系统缩短了37 d。泥龄对构建的DPR系统效能影响显著,泥龄为35 d的系统除磷脱氮效能较高,PO_(4)^(3-)-P、NO_(3)^(-)-N、COD去除率分别为86.25%、98.00%、92.00%,系统释磷、吸磷、反硝化脱氮速率分别达4.60 mg/(L·h)、4.13 mg/(L·h)、5.53 mg/(L·h)。DPR-SNAD组合处理系统的氨氮(NH_(4)^(+)-N)、总氮(Total Nitrogen,TN)、总磷(Total Phosphorus,TP)、化学需氧量(Chemical Oxygen Demand,COD)去除率分别为100%、98.64%、86.00%、93.30%。TN、TP去除率较对照组SNAP分别提高了19.20百分点和86.00百分点。16S rRNA高通量测序结果显示,组合系统脱氮除磷功能菌属主要有Rhodobacter、Candidatus_Brocadia、Nitrosomonas、Gemmobacter,SNAD系统中厌氧氨氧化菌(Anaerobic Ammonia Oxidation,AnAOB)相对丰度显著高于对照组SNAP系统,DPR促进SNAD提高了系统脱氮效能。
Aiming at the shortcomings of the single-stage autotrophic denitrification system treating low ammonia wastewater,such as massive residual nitrate,poor tolerance to organic matter,and lack of phosphorus removal function,single-stage Simultaneous Partial nitrification,Anaerobic Ammonium Oxidation and Denitrification(SNAD)and Denitrifying phosphorus removal(DPR)were combined.The effects of ammonia nitrogen load and sludge age on the performance of nitrogen and phosphorus removal were investigated in the SNAP(Single-stage nitrogen removal using anammox and partial nitritation)system and DPR system,respectively.At the same time,the distribution of the microbial population was deeply explored in the DPR SNAD system.The results show that the construction time of the SNAP system with an ammonia nitrogen load of 0.20 kg N/(m^(3)·d)was 63 days by decreasing the ammonia nitrogen concentration step by step,which is 37 days shorter than that of the system with ammonia nitrogen load of 0.05 kg N/(m^(3)·d).The sludge age had a significant effect on the efficiency of the DPR system.The system with a sludge age of 35 days exhibited high nitrogen and phosphorus removal efficiencies and the removal efficiencies of PO_(4)^(3-)-P,NO_(3)^(-)N and COD were 86.25%,98%and 92%,respectively.The rates of phosphorus release,phosphorus uptake and denitrification were 4.6 mg/(L·h),4.13 mg/(L·h)and 5.53 mg/(L·h),respectively.The NH_(4)^(+)N,TN,TP and COD removal rates of DPR SNAD system reached 100%,98.64%,86.00%and 93.30%,respectively.The removal rates of TN and TP of DPR SNAD were 19.20 percentage point and 86.00 percentage point higher than those of the control group(SNAP),respectively.According to the results of 16S rRNA high-throughput sequencing,Rhodobacter,Candidatus Brocadia,Nitrosomonas and Gemmobacter were the main functional bacteria related to nitrogen and phosphorus removal in the combined system.The relative abundance of AnAOB in the SNAD system was significantly higher than that in the SNAP system,and DPR promoted the efficiency of nitrogen removal in the SNAD system.
作者
周健
宋晔珂
刘轶
曹猛
和雪杰
周炯
温馨
ZHOU Jian;SONG Yeke;LIU Yi;CAO Meng;HE Xuejie;ZHOU Jiong;WEN Xin(Key Laboratory of Ecological Environment in the Three Gorges Reservoir Area of the Ministry of Education,Chongqing University,Chongqing 400044,China;Chongqing Water Group Co.,Ltd.,Chongqing 400010,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第2期713-721,共9页
Journal of Safety and Environment
基金
重庆水务环境控股集团有限公司科技创新项目(2022-07)。
关键词
环境工程学
低氨氮废水
单级自养脱氮
反硝化除磷
厌氧氨氧化
environmental engineering
low ammonia-nitrogen wastewater
single-stage autotrophic nitrogen removal
denitrifying phosphorus removal
anammox
