摘要
采用模拟废水研究了1.5%盐度对厌氧反硝化上流式厌氧污泥反应器(DN-UASB)脱氮效能及工艺稳定性的影响。实验结果表明,当进水NO_(3)^(-)-N浓度为1000 mg/L,C/N为4.5时,1.5%盐度下DN-UASB反应器最高氮去除速率(NRR)可达35.52 kg/(m^(3)·d),最高COD去除速率(CRR)可达127.8 kg/(m^(3)·d),高于无盐下DN-UASB反应器最高NRR与CRR(分别为28.61和94.5 kg/(m^(3)·d))。1.5%盐度可提高DN-UASB脱氮效能,且无明显NO_(2)^(-)-N积累。1.5%盐度、无盐条件下DN-UASB反应器C/N均随氮容积负荷(NLR)提升而降低,高负荷工况下1.5%盐度环境下C/N降幅达21.4%,高于无盐环境下的C/N降幅(4.7%)。1.5%盐度、无盐环境下,高负荷工况出水TN、COD浓度均较常负荷工况呈现明显波动。1.5%盐度可减缓出水水质波动,使出水水质更稳定,出水TN的变异系数比和极差系数比较无盐条件分别降低40.1%与32.8%,出水COD的变异系数比和极差系数比较无盐条件分别降低58.7%与44.3%,更有利于反应器稳定运行。
The effect on nitrogen removal performance and process stability of anaerobic denitrification-upflow anaerobic sludge reactor(DN-UASB)under 1.5%salinity was investigated.The results revealed that the maximum nitrate removal rate(NRR)and COD removal rate(CRR)of DN-UASB under 1.5%salinity can reach 35.52 and 127.8 kg/(m^(3)·d),respectively,and the maximum NRR and CRR of DN-UASB under 0%salinity also can reach 28.61 and 94.5 kg/(m^(3)·d),respectively.Under 1.5%salinity condition,the nitrate removal performance of DN-UASB can be improved and no obvious NO_(2)^(-)-N accumulation appeared.The value of C/N ratio under 1.5%salinity or salt-free conditions both decreased as the NLR increased,but C/N value decreased by 21.4%under 1.5%salinity,whereas C/N value only depressed by 4.7%under salt-free condition.Effluent TN and COD concentration of DN-UASB under 1.5%salinity and salt-free environment during high NLR process shows obvious fluctuations compared with normal NLR.The fluctuation of effluent water quality can be significantly slowed down under 1.5%salinity,and the relative variation and relative range of effluent TN can be reduced by 40.1%and 32.8%compared with that of salt-free conditions,and the fore-mentioned coefficients of effluent COD are also reduced by 58.7%and 44.3%under 1.5%salinity compared with the salt-free condition,which indicated a stable operation of DN-UASB under 1.5%salinity.
作者
于冰洁
朱晓桐
栾亚萍
林久淑
姚晨
季军远
Yu Bingjie;Zhu Xiaotong;Luan Yaping;Lin Jiushu;Yao Chen;Ji Junyuan(The Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;Shandong Key Laboratory of Marine Environmental Geology Engineering, Ocean University of China, Qingdao 266100, China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第12期97-106,共10页
Periodical of Ocean University of China
基金
国家自然科学基金项目(51408570,51978636)
中央高校基本科研业务项目(201964005)资助。
