Previous Articles     Next Articles

Effect of pH on nitrification function of seawater biofilter during start-up stage

  

  1. （1 Key Laboratory of Experimental Marine Biology ,Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,Shandong, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033, Shandong, China;
    4 College of Ocean Technique and Environment, Dalian Ocean University,Dalian116023, Liaoning, China)
  • Online:2019-05-13 Published:2019-02-20

pH对海水生物滤器启动阶段构建硝化功能的影响

  

  1. (1中国科学院海洋研究所，中科院实验海洋生物学重点实验室，山东 青岛 266071；
    2中国科学院大学，北京 100049；
    3 青岛理工大学环境与市政工程学院，山东 青岛 266033；
    4大连海洋大学海洋科技与环境学院，辽宁 大连116023)
  • 通讯作者: 刘鹰(1969—)，男，教授，博士，研究方向：水产工程及生态学。E-mail: yingliu@dlou.edu.cn
  • 作者简介:徐建平(1989—)，男，博士研究生，研究方向：循环水养殖及水污染控制。E-mail: 18354203286@163.com
  • 基金资助:
     国家重点研发计划资助（2017YFD0701703）；国家自然科学基金（31472312，31672673）；青岛市海洋经济创新发展示范城市重点项目“工业循环水高效智能养殖装备产业链协同创新与构建”；江苏省现代农业研究开发示范类项目（BE2015325）。

PDF (PC)

Abstract: Biofilters running steadily and efficiently are a crucial part in recirculating aquaculture system, but the operational process of biofilter may be affected by many environmental factors. In this paper, the influence of influent pH on nitrification performance of fluidized bed biofilter is studied in two parts: (1) the fluidized bed biofilter in the start-up stage of biofilm formation is studied, mainly focusing on the influence of influent pH (7.0, 7.5, 8.0, 8.5) on the starting of fluidized bed biofilter under the condition of natural biofilm formation. The results show that when pH is 7.5, the biofilter has the shortest starting time, and can run steadily after about 50 days and remove the most TAN and NO2—N. (2) After the biofilm is mature, specific to biofilter running steadily, the influence of pH (7.0, 7.5, 7.7, 8.0, 8.5) on nitrification performance of biofilter is studied. The results show that when pH is 7.7, the rate to remove TAN is the highest, reaching 0.58±0.020 mg/(L·h). In addition, when pH is 7.5, the effect to treat NO2—N is the best. It is also found in the test that there are different degrees of NO2—N accumulation in all treatment groups, which is intensified with increase of pH. Suitable influent pH can shorten the biofilm formation cycle and improve the nitrification performance of biofilter. The results can provide theoretical guidance for biofilm formation starting and stable running of seawater biofilter.

Key words: Seawater biofilter, pH, biofilm formation starting, nitrification capacity

摘要： 稳定高效运行的生物滤器是循环水系统养殖过程中至关重要的部分，然而生物滤器在运行过程中会受到诸多环境因子的影响。该文分两部分对进水pH对流化床生物滤器硝化性能的影响进行研究：（1）针对流化床生物滤器挂膜启动阶段进行研究，研究在自然挂膜情况下，不同进水pH（7.0、7.5、8.0、8.5）对流化床生物滤器启动的影响。结果表明，生物滤器在pH7.5时启动时间最短，50 d左右便能够稳定运行，而且在此pH条件下生物滤器对TAN、NO2--N的去除效率最高。（2）生物膜成熟后，针对稳定运行的生物滤器进行试验，研究不同pH（7.0、7.5、7.7、8.0、8.5）对生物滤器硝化性能的影响。结果表明，生物滤器在pH7.7时，对TAN的去除速率最高，达到0.58±0.020 mg/(L·h)。另外，生物滤器在pH7.5时对NO2--N的处理效果最好。试验还发现各处理组皆存在不同程度的NO2--N积累现象，该现象随着pH的升高不断加剧。适宜的进水pH能够缩短生物滤器的挂膜周期并提高其硝化性能。研究结果可以为海水生物滤器的挂膜启动和稳定运行提供理论指导。

关键词: 海水生物滤器, pH, 挂膜启动, 硝化能力