引用本文:林兴,方文烨,金润,郭超然,李祥,黄勇,等.低基质CANON中短程硝化稳定性控制研究[J].环境科学研究,2018,31(8):1423-1430.
LIN Xing,FANG Wenye,JIN Run,GUO Chaoran,LI Xiang,HUANG Yong,et al.Stable Operational Strategy of Paritial Nitritation in CANON with Low Strength Wastewater[J].Reserrch of Environmental Science,2018,31(8):1423-1430.]
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低基质CANON中短程硝化稳定性控制研究
林兴1,2,3, 方文烨1,2,3, 金润1,2,3, 郭超然1,2,3, 李祥1,2,3, 黄勇1,2,3
1. 苏州科技大学环境科学与工程学院, 江苏 苏州 215009;
2. 苏州科技大学, 城市生活污水资源化利用技术国家地方联合工程实验室, 江苏 苏州 215009;
3. 苏州科技大学环境生物技术研究所, 江苏 苏州 215009
摘要:
为研究主流PN/A(短程硝化/厌氧氨氧化)工艺中短程硝化稳定运行控制策略,采用连续流CANON反应器,以人工模拟低氨氮[ρ(NH4+-N)为50 mg/L]无机废水为进水,考察了FA(free ammonia,游离氨)、DO等控制参数对低氨氮下连续流CANON反应器短程硝化的影响.结果表明,启动前期提高进水NLR(nitrogen volume loading,氮容积负荷)有利于维持CANON的稳定运行,控制NLR在1.01 kg/(m3·d),运行至32 d,ΔNO3--N/ΔNH4+-N(指NO3--N产生量与NH4+-N消耗量的比值)始终维持在(0.11±0.02).然而随着运行时间的延长,ρ(NO3--N)逐渐增长,ΔNO3--N/ΔNH4+-N从理论值升至0.49,短程硝化受到严重破坏.过程中控制ρ(FA)在2 mg/L以上,NOB(亚硝酸盐氧化菌)受到明显抑制,但抑制周期短暂,并且随着ρ(FA)的降低,ρ(NO3--N)快速升高,FA抑制失效.限制氧供给,控制ρ(DO)< 0.3 mg/L,ΔNO3--N/ΔNH4+-N降至0.16,但NOB并未被完全抑制,ρ(NO3--N)仍呈上升趋势.微生物活性测定结果表明,运行中功能菌活性均得到增强,并且发现VAOB > VAnAOB > VNOB,在限氧条件下[ρ(DO)< 0.3 mg/L]运行,NOB虽受抑制但仍维持较高活性.研究显示,在低氨氮条件下,采用FA以及限氧的方式对NOB抑制作用有限,对NOB控制条件的选择需结合反应器内微生物种群结构、生长特性进行进一步研究.
关键词:  CANON  短程硝化  FA  DO  微生物活性
DOI:10.13198/j.issn.1001-6929.2018.05.21
分类号:X703
基金项目:国家研发计划项目(No.2016YFC0401103)
Stable Operational Strategy of Paritial Nitritation in CANON with Low Strength Wastewater
LIN Xing1,2,3, FANG Wenye1,2,3, JIN Run1,2,3, GUO Chaoran1,2,3, LI Xiang1,2,3, HUANG Yong1,2,3
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China;
3. Institute of Environmental Biotechnology, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract:
In order to investigate the stable operational strategy of partial nitrification in PN/ANAMMOX process, a continuous flow reactor was used to treat the low strength (50 mg/L) wastewater. The effects of control parameters such as free ammonia (FA) and dissolved oxygen (DO) on partial nitrification in a continuous flow CANON reactor under low ammonia nitrogen were investigated. The results show that increasing nitrogen volume loading (NLR) in the early stage of start-up is beneficial to maintaining the stable operation of CANON reactor, running at 32 d with NLR and ΔNO3--N/ΔNH4+-N maintained at 1.01 kg/(m3·d), and (0.11±0.02) respectively. However, with a prolonged of operation period, the concentration of NO3--N was gradually increased from its theoretical value to 0.49 which subjected partial nitrification to serious damaged. Subsequently, FA and DO were controlled to inhibit NOB. The inhibition in NOB was observed when ρ(FA) was as up to 2 mg/L, though the inhibition period was relatively short. With the decrease of ρ(FA), ρ(NO3--N) increased rapidly. Also, by limiting oxygen supply and maintaining ρ(DO) < 0.3 mg/L,ΔNO3--N/ΔNH4+-N decreased to 0.16. However NOB was not completely inhibited and ρ(NO3--N) was still rising. The results of microbial activity determination showed that the activity of functional bacteria was enhanced with the results VAOB > VAnAOB > VNOB. Under the condition of oxygen limited (ρ(DO) < 0.3 mg/L), the activity of NOB was maintained at a high level. The study showed that NOB was hardly inhabited by using FA and oxygen limited condition under low concentration of ammonia nitrogen. The selection of NOB control conditions should be further studied in combination with the microbial population structure and the growth characteristic in the reactor.
Key words:  CANON  partial nitrification  FA  DO  microbial activity