Long-term performance and biofilms of the novel nano manganese dioxide coupling carbon source pre-loaded biological activated carbon filters for drinking water
Long-term performance and biofilms of the novel nano manganese dioxide coupling carbon source pre-loaded biological activated carbon filters for drinking water
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DOI：
10.1016/j.envres.2023.117436
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发表时间：
2023-10-23
影响因子：
8.3
通讯作者：
Ma，Jun
中科院分区：
文献类型：
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作者：
Qin，Wen;Zheng，Chengyuan;Ma，Jun
为了加快生物活性炭（BAC）滤池的启动，提高其对氨氮（NH 4 +-N）的去除效果，设置了3种预负载基质（蔗糖和/或纳米二氧化锰（nMnO 2））的BAC滤池，考察了197 d的长期运行对污染物的去除效果和微生物特性。蔗糖与负载nMnO 2的生物活性炭滤池耦合处理的平均NH 4 +-N去除率最高（71.18%），是对照滤池（18.58%）的3.83倍。根据碱度消耗量（6.12 mmol/L）计算，蔗糖与nMnO 2负载生物活性炭耦合处理后，NH 4 +-N通过传统硝化反硝化或同步硝化反硝化（SND）途径去除29%。负载BAC的底物没有碳源和锰的泄漏，也没有亚硝酸盐的积累。蔗糖-nMnO 2-BAC复合体系中的优势菌群为脱氯单胞菌（Dechloromona）和酸性蛋白酶（Acidaminobacterium），分别占菌体总数的8.02%和15.16%，具有硝化或反硝化作用。过氧乙酸（PAA）预氧化与基质负载生物活性炭（BAC）组合工艺由于可同化有机碳（AOC）的产生，对NH 4 +-N和微污染物的去除效果显著PAA（100 μM）/Fe 2+预氧化的生物量为5.98 ± 1.93 μg-C/mL，（4.57 ± 3.07）× 107cells/g DW BAC。因此，nMnO 2耦合碳源预负荷策略不仅可以提高初始定殖率，而且可以促进污染物的长期去除。
In order to accelerate the start-up of biological activated carbon (BAC) filters and enhance ammonium (NH4+-N) removal performance, three substrates (sucrose and/or nano manganese dioxide (nMnO2)) pre-loaded BAC filters were set up to investigate the pollutants removals and microbiological characteristics for a long-term operation of 197 days. The average NH4+-N removal performance treated by the sucrose coupled with nMnO2loaded BAC filter was the highest (71.18 %), which was 3.83 times of that by the control filter (18.58 %). 29 % of NH4+-N treated by the sucrose coupled with nMnO2loaded BAC removed through the traditional nitrification and denitrification, or simultaneous nitrification and denitrification (SND) pathways according to the calculation of the alkalinity consumption (6.12 mmol/L). There was no leakage of carbon source and Mn, and no accumulation of nitrite from the substrates loaded BAC. The dominant bacteria in the sucrose coupled with nMnO2loaded BAC wereDechloromona(accounting for 8.02% of the total bacterial) andAcidaminobacter(accounting for 15.16% of total bacterial) on the Day 180, which had the capacity of nitrification or denitrification. NH4+-N and micropollutants removals treated by the combined process of peracetic acid (PAA) pre-oxidation and substrates loaded BAC were significant due to the generation of assimilable organic carbon (AOC) (5.98 ± 1.93 μg-C/mL) by PAA (100 μM)/Fe2+pre-oxidation and the higher biomass ((4.57 ± 3.07) × 107cells/g DW BAC) in the sucrose coupled with nMnO2loaded BAC filter. Therefore, nMnO2coupling carbon source pre-loading strategy could not only enhance initial colonization, but also promote pollutants removals for long-term operation.