摘要
采用SBR工艺处理稀土矿区低碳氨氮废水,对活性污泥进行驯化培养并考察了曝气量、曝气时间及碳氮比对短程硝化系统的影响。试验结果表明:温度为(28±1)℃、曝气量为65 L/h,pH值为8的条件下,经过69 d的驯化培养后,系统对氨氮的去除率达92%,亚硝态氮积累率稳定在90%以上,对短程硝化过程启动前后样品进行高通量测序,结果表明:污泥中微生物种类减少,多样性降低,亚硝化单胞菌属成为优势种群,占比达11.5%。提高曝气量至120 L/h并在此条件下运行7 d后,亚硝态氮积累率下降至82%;维持C/N在3.5~7.6之间,系统中NH4^+-N的去除率均能稳定在95%左右,NO2^--N积累率也均可达93%以上;过度曝气会破坏短程硝化系统,过度曝气至第8天,亚硝态氮的积累率降至48.89%。
SBR process was used to treat low-carbon ammonia-nitrogen wastewater from rare earth mining area.Acclimation and cultivation of activated sludge,the effect of aeration volume,aeration time and C/N ratio on short-cut nitrification system were investigated.The experimental results showed that the system had an ammonia nitrogen removal rate of nearly 92%,and annitrite nitrogen accumulation rate of more than 90%at the temperature range of 28±1℃,with an aeration volume of 65 L/h and a pH of 8,after the sludge was domesticated and cultivated for 69 days.The sludge was detected by high-throughput sequencing before and after it was treated by short-cut nitrification.The analysis results showed that the microbial species in the sludge decreased after the start-up of short-cut nitrification.Nitrosomonas was the dominant species in the sludge,accounting for 11.5%of the total species.When aeration volume was increased to 120 L/h and this condition was kept for 7 days,the nitrite nitrogen accumulation rate decreased to 82%.When C/N ratio was kept between 3.5 and 7.6,the removal rate of NH4+-N in the system could stay about 95%and the accumulation rate of NO2-N was above 93%.Excessive aeration would destroy the short-range nitrification system,and the nitrite nitrogen accumulation rate would drop to 48.89%if excessive aeration last for 8 days.
作者
刘佛财
罗玲
李丹
钟常明
LIU Focai;LUO Ling;LI Dan;ZHONG Changming(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control,Ganzhou 341000,China)
出处
《有色金属科学与工程》
CAS
2020年第2期112-118,共7页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(21866014)。
