CIESC Journal ›› 2014, Vol. 65 ›› Issue (12): 4985-4996.DOI: 10.3969/j.issn.0438-1157.2014.12.046

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Shortcut nitrification and denitrifying phosphorus removal in improved A2/O technique with long SRT

LUO Yahong1,2, LI Dong1, BAO Linlin1, XU Da2, CAI Yan'an2, ZHANG Jie2,3   

  1. 1. School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, Henan, China;
    2. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
    3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
  • Received:2014-05-16 Revised:2014-07-03 Online:2014-12-05 Published:2014-12-05
  • Supported by:

    supported by the National Water Pollution Control and Management Technology Major Projects (2012ZX07202-005).

长泥龄改良A2/O工艺的短程硝化反硝化除磷

罗亚红1,2, 李冬1, 鲍林林1, 许达2, 蔡言安2, 张杰2,3   

  1. 1. 河南师范大学环境学院黄淮水环境与污染防治省部共建教育部重点实验室、河南省环境污染控制重点实验室, 河南 新乡 453007;
    2. 北京工业大学水质科学与水环境恢复工程北京市重点实验室, 北京 100124;
    3. 哈尔滨工业大学城市水资源与水环境国家重点实验室, 黑龙江 哈尔滨 150090
  • 通讯作者: 李冬
  • 基金资助:

    国家科技重大专项水专项(2012ZX07202-005).

Abstract: Aiming at solving the contradiction of sludge retention time (SRT) between nitrification and dephosphorization, and enhancing the simultaneous nitrogen (N) and phosphorus (P) removal efficiency of the low C/N (P) ratio domestic sewage in the traditional A2/O process, an improved A2/O technique with long SRT was developed. The novel process could select and strengthen the activated sludge, and enrich the denitrifying phosphorus accumulating organisms (DPAO) with long SRT effectively. After washing out nitrite oxidizing bacteria (NOB), the reactor ran under the condition of SRT=19.6 d, and sludge concentration (MLSS)=5.5 g·L-1, hydraulic retention time (HRT)=8.2 h, sludge return ratio (R)=90%, nitrated liquid reflux ratio (r)=250%, dissolved oxygen (DO)=1.5—0.3 mg·L-1 for the A2/O zone. HRT=4 h, aeration cycle was 1 h, aeration time was 1 min (DO=0.3—0.5 mg·L-1) and settling time was 59 min for the intermittent aeration zone. Average removal rate of COD, NH4+-N, TP and TN reached 88.71%, 99.2%, 93.77% and 89.52% respectively, nitrosation rate (NO2--N/NOx--N) was up to 97.2%, and DPAO/PAO ratio in sludge was 95.5%, and the final effluent met the first class level A of the GB 18918—2002 standard. It was found that about 72.96% of COD in sewage was utilized by DPAO for PHA production to accumulate P, 15.75% of COD was consumed by heterotrophic denitrifying bacteria, and about 41.96% and 31.31% of N were wiped off through phosphorus removal and heterotrophic denitrifying. The discharged sludge was mainly composed of the biomass of DPAO and denitrifying bacteria, accounting for 82.74% and 17.24% respectively. The technique could reduce 58.76% of carbon source consumption and 44.6% of sludge discharge comparing to the traditional nitrogen phosphorus removal pathway.

Key words: A2/O, anaerobic, aerobic, waste water, low C/N ratio, denitrifying phosphorus removal, partial nitrification

摘要: 为解决传统A2/O工艺硝化与除磷泥龄(SRT)之间的矛盾,进一步提高低C/N(P)比生活污水同步脱氮除磷效率,采用一种改良A2/O工艺在长SRT条件下处理生活污水.试验结果表明,该工艺可有效筛选和强化反应器内活性污泥,并大量富集长SRT的反硝化除磷菌(DPAO).通过亚硝酸盐氧化菌(NOB)淘洗阶段后,反应器在SRT=19.6d、A2O段污泥浓度(MLSS)=5.5 g·L-1、水力停留时间(HRT)=8.2 h、污泥回流比(R)=90%、硝化液回流比(r)=250%、溶解氧(DO)=1.5~0.3 mg·L-1,间歇曝气段HRT=4 h、曝气周期1 h曝气1 min(DO=0.3~0.5 mg·L-1)、沉淀59 min条件下长期运行,COD、NH4+-N、TP和TN的平均去除率分别为88.71%、99.2%、93.77%和89.52%,出水亚硝化率(NO2--N/NOx--N)可达97.2%,DPAO占聚磷菌(PAO)比为95.5%.污水中约72.96%的COD被DPAO合成PHA除磷,15.75%的COD由异养反硝化消耗,约41.96%和31.31%的N分别通过反硝化除磷和异养反硝化去除.剩余污泥主要由DPAO和反硝化菌增殖产生,分别占82.74%和17.24%,较传统脱氮除磷途径减少了58.76%的碳源消耗和44.6%的污泥排放.

关键词: A2/O, 厌氧, 需氧, 废水, 低C/N比, 反硝化除磷, 短程硝化

CLC Number: