好氧微生物颗粒对次氮基三乙酸（NTA）和铁-NTA络合物的生物降解作用
Biodegradation of nitrilotriacetic acid (NTA) and ferric-NTA complex by aerobic microbial granules.
作者信息
Nancharaiah Y V, Schwarzenbeck N, Mohan T V K, Narasimhan S V, Wilderer P A, Venugopalan V P
机构信息
Water and Steam Chemistry Laboratory, BARC Facilities, Kalpakkam, Tamil Nadu 603102, India.
出版信息
Water Res. 2006 May;40(8):1539-46. doi: 10.1016/j.watres.2006.02.006. Epub 2006 Apr 4.
Development of mixed-culture microbial granules under aerobic conditions in a sequencing batch reactor (SBR), capable of completely degrading a recalcitrant metal chelating agent is reported. In laboratory-scale reactor studies, the microbial granules degraded 2mM of free nitrilotriacetic acid (NTA) and Fe(III)-NTA completely in 14 and 40 h, respectively. Free NTA was degraded at a specific rate of 0.7 mM (gMLSS)(-1)h(-1), while Fe(III)-NTA was degraded at a specific rate of 0.37 mM (gMLSS)(-1)h(-1). Achievement of significant degradation rates of NTA and ferric-NTA in double-distilled water suggests that the microbial metabolism is not constrained by lack of essential elements. Efficient degradation of recalcitrant synthetic chelating agents by aerobic microbial granules suggests their potential application in a variety of situations where heavy metals or radionuclides are to be co-disposed with metal chelating agents.
据报道，在序批式反应器（SBR）中，在有氧条件下能够完全降解难降解金属螯合剂的混合培养微生物颗粒得以发展。在实验室规模的反应器研究中，微生物颗粒分别在14小时和40小时内完全降解了2mM的游离氮川三乙酸（NTA）和铁（III）-NTA。游离NTA的降解比速率为0.7 mM（gMLSS）⁻¹h⁻¹，而铁（III）-NTA的降解比速率为0.37 mM（gMLSS）⁻¹h⁻¹。在双蒸水中NTA和铁- NTA实现显著降解速率表明微生物代谢不受必需元素缺乏的限制。需氧微生物颗粒对难降解合成螯合剂的高效降解表明它们在重金属或放射性核素与金属螯合剂共同处置的各种情况下具有潜在应用价值。
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