摘要
在上流式反应器中添加尼龙填料,并以小颗粒单质硫和NaHCO_3作为底物构建自养高效脱氮系统。在(35±1)℃下,经过70 d运行,在HRT为2.4 h、进水NO_3^--N浓度为150 mg/L时,达到1.3 kg/(m^3·d)的最大稳定脱氮能力。启动初期,应该缓慢提高进水NO_3^--N负荷来驯化反应器。S/N(摩尔)批次试验发现,在最佳摩尔比为10时,NO_3^--N的转化率为90%;而摩尔比低于10时,NO_3^--N转化速率随着单质硫粉浓度增大而增大,且摩尔比为1.1时,会出现NO_2^--N积累。由于传质效率低和单质硫流失问题,连续流反应器中S/N(摩尔)比宜在5.5以上,防止出现NO_2^--N积累。当进水NO_3^--N浓度为150 mg/L、HRT为2.4 h时,控制温度从(35±1)℃缓慢降至(20±0.5)℃,反应器脱氮能力稳定在1.4~1.5 kg/(m^3·d),说明本反应器对温度下降适应性较强,具备常温下高效运行的能力。
A high efficient autotrophic nitrogen-removing system is developed by adding nylon filler in an upflow reactor and using fine elemental sulfur particles and NaHCO3 as substrates. The maximum stable nitrogen removal capacity 1.3 kg/(m3·d） is achieved after 70 days＇ operation with an influent NO3--N concentration of 150 mg·L-1 and a HRT of 2. 4 h at 35 ± 1℃. At the beginning of the startup, the volumetric loading rate of NO3-N in influent shall be increased slowly in order to acclimate the reactor.It is found from the S/N （mol） batch experiments that the conversion rate of NO3--N can reach 90% under the optimum S/N molar ratio of 10.When the molar ratio of S/N is lower than 10, the conversion rate of NO3-N increases with the increase of the concentration of elemental sulfur. The NO2-N accumulation occurs when the molar ratio of S/N is 1.1. Due to the problems of low mass transfer efficiency and elemental sulfur loss, it is necessary to ensure S/N molar ratio above 5.5 in the continuous reactor to prevent the occurrence of NO2--N accumulation.The nitrogen removal rate of the reactor can remain stable at 1.4-1.5 kg/(m3·d） when the NO3-N concentration in influent is 150 mg·L-1 , HRT is 2.4 h, the temperature decreases slowly from 35± 1℃ to 20±0. 5℃ .It reveals that the reactor has strong adaptability to temperature drop and has the ability to run efficiently at normal temperature.
作者
姚鹏程
袁怡
龙震宇
谈家彬
YAO Peng-cheng;YUAN yi;LONG Zhen-yu;TAN Jia-bin(School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;Institute of Environmental Biotechnology, Suzhou University of Science and Technology, Suzhou 215009, China;Jiangsu Qingyi Environmental Protection Equipment Co., Ltd., Yangzhou 225200, China)
出处
《现代化工》
CAS
CSCD
北大核心
2018年第5期181-186,共6页
Modern Chemical Industry
基金
扬州市科技局"绿杨金凤计划"项目(yzlyjfjh2016yb059)
国家研发计划项目(2016YFC0401103)
江苏省特色优势学科二期项目
江苏省水处理技术与材料协同创新中心项目
苏州市分离净化材料与技术重点实验室项目(SZS201512)
关键词
单质硫
自养反硝化
生物膜反应器
S/N(摩尔)比
温度影响
elemental sulfur
autotrophic denitrification
biofilm reactor
S/N（tool） ratio
influence of temperature
