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短程硝化在垃圾渗滤液处理工程中的应用
胡云飞1, 裴建川1, 马勤2, 王洁屏2
0
(1.浙江农林大学;2.杭州市临安区环境检测站)
摘要:
在杭州某垃圾填埋场渗滤液处理工程中,以A/O/N工艺为基础进行短程硝化反硝化启动与稳定控制。通过对溶解氧(DO)、污泥浓度(MLSS)、污泥龄(SRT)、混合液回流比、pH、碱度进行定性定量分析,通过控制好氧池低溶解氧浓度成功启动了短程硝化,控制条件为反硝化罐DO浓度小于0.5mg/L、COD氧化罐DO浓度为0.5mg/L-0.8mg/L、硝化罐DO浓度为1.5mg/L~2.2mg/L,系统MLSS为3500mg/L~4500mg/L,污泥龄为9d~13d,混合液回流比为1100%,并对硝化罐进行碱度调节使硝化罐pH稳定在7.6~8.2。系统稳定实现短程硝化反硝化对垃圾渗滤液的脱氮,亚硝酸盐氮积累率稳定在85%以上,COD、氨氮及总氮去除率分别达95%、98.6%、94.2%以上。调试后节省碳源量30%,曝气量降低20%。
关键词:  短程硝化  垃圾渗滤液  生物脱氮  条件控制  工程应用
DOI:
投稿时间:2018-09-26修订日期:2019-05-17
基金项目:农村地下水复合污染的原位修复技术研究
Application of shortcut nitrification in the treatment of landfill leachate
Huyunfei1,2, Peijianchuan1,2, Ma Qin, Wang Jieping
(1.Zhejiang A&2.F University)
Abstract:
Startup and steady operation conditions of short cut nitrification and denitrification based on A/O/N process were studied in a landfill site in Hangzhou city. The effect of dissolved oxygen (DO), mixed liquor suspended solids (MLSS), sludge?retention?time (SRT), mixture liquid reflux ratio, pH, and alkalinity on the system were researched. The results show that the short cut nitrification was achieved successfully by controlling DO at a low concentration in the aerobic tank when pH was 7.6 to 8.2, corresponding DO concentration of 0.5mg/L to 0.8mg/L in the denitrification tank, 0.5mg/Lto 0.8mg/Lin the COD oxidation and 1.5mg/L to 2.2mg/Lin the nitrification tank , MLSS concentration of 3500mg/L to 4500mg/L , sludge?retention?time 9d to 13d and mixture liquid reflux ratio 1100%. For the short cut nitrification system, nitrite accumulation rate remained above 85%, while COD removal efficency was more than 95%, NH3-N removal efficiency was more than 98.6% and TN removal efficency was more than 94.2% under steady state. Applying?short cut nitrification?can realize?carbon source use saving 30% and the?energy consumption?reduced?by?20% compared to the use of A/O/N process.
Key words:  landfill leachate  shortcut nitrification  biological nitrogen removal  condition control  engineering application