Effects of abrupt salinity increase on nitrification processes in a freshwater moving bed biofilter
Effects of abrupt salinity increase on nitrification processes in a freshwater moving bed biofilter
复制标题
DOI：
10.1016/j.aquaeng.2018.12.005
复制
发表时间：
2019-02-01
影响因子：
4
通讯作者：
Pedersen, Lars-Flemming
中科院分区：
文献类型：
--
作者：
Kinyage, John Peter Hewa;Pedersen, Per Bovbjerg;Pedersen, Lars-Flemming
硝化过程是一种广泛使用的生物方法，负责循环水产养殖系统（RAS）生物过滤器中氨和亚硝酸盐的去除。鉴于这一关键作用，不同水质参数对硝化效率的影响是 RAS 运行的重要信息。影响参数之一是盐度，据报道淡水 RAS 生物过滤器中的盐度波动会影响硝化细菌。本研究调查了淡水 RAS 中盐度突然增加对底物依赖性（1' 级）和底物无关性（0' 级）硝化速率的影响。当盐度突然增加到千分之 25 及以上时，总氨氮 (TAN) 的表面特异性去除 (STR) 和亚硝酸盐表面特异性去除 (SNR) 受到 100% 的抑制。在较低盐度下观察到快速周转（即 [NH4-N+] 和 [NO2-N-] 急剧下降）（
The nitrification process is a widely used biological approach responsible for ammonia and nitrite removal in recirculating aquaculture system (RAS) biofilters. Given this pivotal role, the influence of different water quality parameter on nitrification efficiency is important information for RAS operations. One influencing parameter is salinity, and salinity fluctuations in freshwater RAS biofilters are reported to affect the nitrifying bacteria. This study investigated the effects of abrupt increase in salinity in freshwater RAS on substrate-dependent (1'-order) as well as substrate independent (0'-order) nitrification rates. A 100% inhibition was found for surface specific removal (STR) of total ammonia nitrogen (TAN) and surface specific nitrite removal (SNR) when salinity was abruptly increased to 25 parts per thousand and above. A fast turnover (i.e. steep decline in [NH4-N+] and [NO2-N-]) were observed at lower salinities (