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本文研究碳氮(C/N)比变化对移动床生物膜反应器(MBBR)处理海水养殖废水性能的影响。结果表明,当C/N比从7∶1降至3∶1,出水COD浓度无明显变化,平均去除率保持在90%以上。C/N比的变化对脱氮过程有较大影响,当C/N比从7∶1降低至3∶1,NH+_4-N去除率由89.51%±1.24%增至92.70%±1.08%,NO~-2-N浓度由(4.84±0.50) mg/L降至0 mg/L,NO~-3-N浓度由(0.47±0.29) mg/L升至(8.12±0.25) mg/L。C/N比的降低提高了比氨氧化速率、比亚硝酸盐氧化速率和与硝化相关的微生物酶活性,但降低了比耗氧速率、比硝酸盐还原速率、比亚硝酸盐还原速率、脱氢酶活性和与反硝化相关的微生物酶活性。松散型胞外聚合物和紧密型胞外聚合物的多糖含量随C/N比的降低而降低,说明在低COD条件下,多糖能够被微生物利用。微生物群落的丰富度和多样性随C/N比的降低而降低,硝化菌属(Nitrosomonas和Nitrospira)和反硝化菌属(Azoarcus、Comamonas、Hyphomicrobium、Paracoccus、Thauera、Devosia、Pseudomonas和Rhodanobacter)的相对丰度发生改变,从而影响MBBR脱氮性能。
Abstract：The effect of a Moving Bed Biofilm Reactor(MBBR) on the treatment of mariculture wastewater were evaluated at different C/N ratios. The results showed that the effluent COD concentration had no significant variation with the decrease of C/N ratio from 7∶1 to 3∶1, and the average removal efficiency remained above 90%. The removal efficiency of NH+_4-N increased from 89.51%±1.24% to 92.70%±1.08% with the C/N ratio decreased from 7∶1 to 3∶1. The effluent NO~-2-N concentration decreased from(4.84±0.50)mg/L to 0 mg/L, and the effluent NO~-3-N concentration increased from(0.47±0.29)mg/L to(8.12±0.25)mg/L. With the decrease of C/N ratio, the specific oxygen-utilizing rate, specific nitrate-reducing rate, specific nitrite-reducing rate and microbial enzymatic activity related to denitrification declined, and the specific ammonia-oxidizing rate, specific nitrite-oxidizing rate and microbial enzymatic activity related to nitrification increased. The polysaccharide(PS) of loosely-bound extracellular polymeric substances(LB-EPS) and tightly-bound extracellular polymeric substabces(TB-EPS) decreased with the decrease of C/N ratio, indicating that PS could be utilized by microorganisms under low COD concentration. High throughput sequencing indicated that the richness and diversity of microbial community reduced. The relative abundance of nitrifying genera(Nitrosomonas and Nitrospira) and denitrifying genera(Azoarcus,Comamonas,Hyphomicrobium,Paracoccus,Thauera,Devosia,Pseudomonas and Rhodanobacter) changed, which could further affect the nitrogen removal performance of MBBR.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20200212
中图分类号:X714
引用信息:
[1]吴淑妍,潘云浩,鲁帅领,等.碳氮比对移动床生物膜反应器处理海水养殖废水性能的影响[J],2021,51(06):99-108.DOI:10.16441/j.cnki.hdxb.20200212.
基金信息:
中央高校基本科研业务费专项(201964003)资助~~