摘要
一般而言，生物脱氮是采用常规的硝化反硝化工艺去除的，但此工艺对大多数高氨氮废水而言，并不适用，这是因为高氨氮废水往往会面临碳源不足的瓶颈，还存在曝气量过大的弊端：1gNH4＋N完成硝化反应，就需要消耗4．57gO2[3]，而曝气量是污水厂耗能的主要组成。
The effect of aeration rate on the efficiency of CANON （completely autotrophic nitrogenremoval over nitrite） process was studied to improve total nitrogen removal of ammonium-rich wastewater. With simulated wastewater as influent, two kinds of CANON reactors, which used sponge and modified polyethylene as carriers respectively, were studied in tests. The results showed that total nitrogen removal efficiency and removal load were closely related to aeration rate, the increase of aeration rate would improve total nitrogen removal of CANON reactor when aeration rate was less than the limiting aeration rate. For the CANON reactor which used sponge as carrier, when aeration rate was 35.8 m3 · m^-3 · h^-1 , the total nitrogen removal efficiency reached the maximum value of 79.48%, and total nitrogen removal load was 2.32 kg · m^-3 · d^-1. When aeration rate was more than the limiting aeration rate, the effect on total nitrogen removal remained stable, because the structure of sponge protected the Anammox bacteria from inhibition by dissolved oxygen. With sponge as carrier, more biomass could be retained in the CANON reactor, especially for Anammox bacteria, which guaranteed the stable operation of the CANON reactor. For the CANON reactor which used modified polyethylene as carrier, when aeration rate was 6.3 m3 · m^-3 · h^-1 , the total nitrogen removal efficiency reached the maximum value of 77. 6%, and totalnitrogen removal load was 1.01 kg · m^-3 · d^-1. When aeration rate was more than the limiting aeration rae, the effect on total nitrogen remsyal deteriorated because anammox bacteria were inhibited by dissolved oxygen. Less biomass could be retained, so the reactor was less stable.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第2期496-503,共8页
CIESC Journal
基金
国家自然科学基金项目(50878003)
北京市自然科学基金项目(8092006)
城市水资源与水环境国家重点实验室开放基金项目(08UWQA08)
国家重大科技专项水专项项目(2008ZX07208-003-003
2008ZX07420-004-BJUT001
2008ZX07208-005-003)~~
作者简介
联系人及第一作者：付昆明（1981-），男，博士研究生。
