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首页> 外文期刊>Journal of water reuse and desalination >Development of aerobic granules in sequencing batch reactor with p-nitrophenol as sole carbon source
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Development of aerobic granules in sequencing batch reactor with p-nitrophenol as sole carbon source

机译：以对硝基苯酚为唯一碳源的间歇反应器好氧颗粒的研制

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The present study was aimed at the development of aerobic granules in sequencing batch reactor (SBR) for the biodegradation of p-nitrophenol (PNP). The reactor was started with 50 mg L?1 of PNP. Aerobic granules first appeared within 1 month of the start up of the reactor. The granules were large and strong and had a compact structure. The diameter of stable granules on day 200 was in the range of 2–3 mm. The integrity coefficient and granule density was found to be 98% and 1,031 kg m?3 respectively. The settling velocity of granules was found to be in the range of 3 × 10?2 to 4 × 10?2m s?1. The aerobic granules were able to degrade PNP up to 700 mg L?1 at a removal efficiency of 87%. Gas chromatography–mass spectrometry studies confirmed that the biodegradation of PNP occurred by an initial oxygenase attack that resulted in the release of nitrite and the accumulation of hydroquinone. The specific PNP degradation rate in aerobic granules followed the Haldane model for substrate inhibition. A high specific PNP degradation rate up to 0.872 g PNP g?1 VSS?1 d?1 was sustained up to PNP concentration of 200 mg L?1. Higher removal efficiency, good settling characteristics of aerobic granules, makes a SBR suitable for enhancing the microorganism potential for biodegradation of inhibitory compounds.
机译：本研究的目的是开发用于顺序降解反应器（SBR）的好氧颗粒，用于对硝基苯酚（PNP）的生物降解。用50mg L-1的PNP开始反应器。好氧颗粒首先在反应器启动后的1个月内出现。颗粒大而结实，并具有致密的结构。在第200天，稳定颗粒的直径在2-3 mm范围内。发现完整性系数和颗粒密度分别为98％和1,031 kg m？3。发现颗粒的沉降速度在3×10 -2至4×10 -2 m s·1的范围内。好氧颗粒能够将PNP降解至700 mg L？1，去除效率为87％。气相色谱-质谱研究证实，PNP的生物降解是由最初的加氧酶攻击引起的，该攻击导致亚硝酸盐的释放和对苯二酚的积累。好氧颗粒中特定的PNP降解速率遵循Haldane模型进行底物抑制。 PNP浓度达到200 mg L？1时，PNP的高特定降解率高达0.872 g PNP g？1 VSS？1 d？1。较高的去除效率，好氧颗粒的良好沉降特性使SBR适合于增强抑制化合物生物降解的微生物潜力。

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