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固定化微藻流化床反应器去除低碳污水中氨氮的潜力
引用本文:杨美娟,刘祥,王凯军,马金元. 固定化微藻流化床反应器去除低碳污水中氨氮的潜力[J]. 中国环境科学, 2020, 40(5): 2040-2046
作者姓名:杨美娟  刘祥  王凯军  马金元
作者单位:清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07103-001);国家水体污染控制与治理科技重大专项(2017ZX07102-003)
摘    要:以固定化微藻颗粒为原料,通过搭建流化床反应器强化微藻对氨氮(NH4+-N)的去除,设计了藻种、污水上升流速、光周期和光照强度四组单一变量实验,系统地研究了不同条件下微藻去除NH4+-N的能力.结果表明,当以固定化斜生栅藻为原料、污水上升流速为6.8m/h、光周期为8:16h和光照强度为4800Lux时,NH4+-N去除效果最优(96.7%).在最优操作条件下,探究了COD为200mg/L时微藻去除NH4+-N的潜力,结果表明,当NH4+-N初始浓度不高于50mg/L时,NH4+-N去除率高于95%.本实验建立了一套半连续微藻流化床实验方法,该方法显著减弱了微藻在生物同化过程中对有机碳源的依赖性,为低COD条件下微藻生物脱氮工艺的设计提供了技术参考和理论基础.

关 键 词:固定化  斜生栅藻  流化床  氨氮  低碳污水  
收稿时间:2019-09-24

The potential of immobilized microalgae fluidized bed reactor for removing ammonium from low carbon wastewater
YANG Mei-juan,LIU Xiang,WANG Kai-jun,MA Jin-yuan. The potential of immobilized microalgae fluidized bed reactor for removing ammonium from low carbon wastewater[J]. China Environmental Science, 2020, 40(5): 2040-2046
Authors:YANG Mei-juan  LIU Xiang  WANG Kai-jun  MA Jin-yuan
Affiliation:State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
Abstract:A fluidized bed reactor was designed to enhance the removal efficiency of ammonium (NH4+-N) by immobilized microalgae. Influences of different operating conditions of this system on NH4+-N removal efficiency were investigated systematically, including microalgae species, sewage up-flow velocity, photo period and light intensity. Results indicated that a highest NH4+-N removal (96.7%) efficiency was achieved by employing immobilized Scenedesmus obliquus at 6.8m/h influence velocity, 8:16h L/D photoperiod and 4800Lux light intensity. Based on these optimum operation conditions, ammonium removal potential of microalgae was studied at 200mg/L COD. Results showed that NH4+-N removal rate is higher than 95% when the initial NH4+-N concentration is no higher than 50mg/L. A semi-continuous methodology for microalgae fluidized bed reactor was established, which significantly reduced the dependence of microalgae on organic carbon source in the process of biological assimilation. The study provides a theoretical guidance for the design of microalgae fluidized bed technology, which could be used to improve the NH4+-N removal potential from low carbon wastewater.
Keywords:immobilization  Scenedesmus obliquus  fluidized bed  ammonium  low carbon wastewater  
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