摘要
在连续流气提内循环反应器中接种絮体硝化污泥,研究硝化颗粒污泥快速培养及其亚硝化功能快速实现过程.结果表明,通过逐步缩短HRT(由5 h降至2.5 h),3周内基本实现污泥微颗粒化;污泥微颗粒化过程中污泥颜色先由黄褐色转为米白色最后变成浅黄色;污泥沉降性能经历了由好变差再转好的变化过程,试验末期污泥SV30=SV5为4%~5%且SVI30=SVI5为12~13 mL·g-1;所得硝化微颗粒污泥平均粒径在134μm(第27 d时)其中近70%的微颗粒污泥粒径在59~163μm狭窄范围,即微颗粒污泥粒径分布均匀性高.随后,逐步提升反应器进水氨氮浓度(由50升至200 mg·L-1),微颗粒污泥在1周内实现亚硝化率达90%以上且亚硝化负荷达1.34 kg·(m3·d)-1;分析认为出水中较高的剩余氨氮浓度(27~50mg·L-1)或较低的DO/NH4+-N(0.03~0.09)是该微颗粒污泥反应器快速实现亚硝化的主要原因.
The rapid achievement of nitrifying micro-granular sludge and its nitritation function was studied in a continuously operated internal-loop airlift reactor seeding with floccular sludge.Results showed that the sludge micro-granulation was almost realized within three weeks by gradually reducing the hydraulic retention time from 5 h to 2.5 h.The color of the sludge first changed from yellowishbrown to creamy white,and then changed to pale yellow during the micro-granulation process.The settleability of the sludge first changed from good to bad,and then recovered to good.The value of the sludge settling velocity(SV) at SV5 and SV30 were both equal to 4%-5%,while SVI30 and SVI5 were both around 12-13 mL·g-1.The average size of the obtained nitrifying micro-granular sludge was 134 μm on day 27.Nearly 70% of the nitrifying micro-granular sludge was maintained in a relatively narrow range of 59463 μm,thus indicating the largely homogeneous diameter distribution of these micro granules.After sludge micro granulation,the nitritation function was achieved within one week by progressively increasing the influent NH4 concentrations from 50 mg·L-1 to 200 mg·L-1.The NO2-accumulation ratio and the nitritation loading rate reached up to 90% and 1.34 kg·(m3·d)-1,respectively.The high level of residual NH4 concentration in the effluent,or the low ratio of dissolved oxygen(DO) to NH4+-N concentrations(0.03-0.09),should be the primary cause of the rapid achievement of nitritation in the micro granular sludge reactor.
作者
刘文如
宋家俊
王建芳
沈耀良
LIU Wen-ru;SONG Jia-jun;WANG Jian-fang;SHEN Yao-liang(National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology,Suzhou 215009,China;School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou 215009,China;Institute of Water Pollution Control and Resource Recovery,Suzhou University of Science and Technology,Suzhou 215009,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第1期353-359,共7页
Environmental Science
基金
国家自然科学基金项目(51808367,51578353)
江苏省高等学校自然科学研究项目(18KJD610003)
城市生活污水资源化利用技术国家地方联合工程实验室开放课题项目(2018KF05)
苏州市科技计划项目(SS201834)
关键词
气提内循环反应器
颗粒污泥
亚硝化
快速启动
连续流
internal-loop airlift reactor
granular sludge
nitritation
rapid start-up
continuous flow
