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首页> 外文期刊>International Biodeterioration & Biodegradation >Powdered activated carbon - membrane bioreactor operated under intermittent aeration and short sludge retention times for micro-polluted surface water treatment
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Powdered activated carbon - membrane bioreactor operated under intermittent aeration and short sludge retention times for micro-polluted surface water treatment

机译：粉末状活性炭-膜生物反应器在间歇曝气和较短的污泥保留时间下运行，用于微污染的地表水处理

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Long sludge retention time (SRT) and continuous aeration are generally adopted in powdered activated carbon - membrane bioreactor (PAC-MBR) process for micro-polluted surface water treatment. However, in this study, the performance of a pilot-scale PAC-MBR under intermittent aeration and short SRTs (2, 4, 6, and 8 d) was investigated. The settling characteristics of sludge and the decay of dissolved oxygen (DO) concentration in the mixed liquor were examined. The results showed that intermittent aeration with proper aeration intervals barely reduced the removal efficiency of pollutants, due to the low DO consumption in the bioreactor and the low settling velocity of the sludge (mostly at the range of 0.04 -0.08 m min(-1)). High concentration ammonia (similar to 3 mg L-1) could be effectively removed even at a fairly short SRT (6 d). As the SRT increased, the removal efficiencies of organic matter and ammonia increased, but the membrane fouling aggravated correspondingly. The successful adoption of intermittent aeration and short SRTs in the pilot-scale PAC-MBR implied that the results could be extrapolated to full-scale applications to reduce operating costs and alleviate membrane fouling. (C) 2015 Elsevier Ltd. All rights reserved.
机译：粉末活性炭-膜生物反应器（PAC-MBR）工艺通常采用长的污泥保留时间（SRT）和连续曝气，以处理微污染的地表水。但是，在这项研究中，研究了间歇曝气和短SRT（2、4、6和8 d）下中试规模PAC-MBR的性能。检查了污泥的沉降特性和混合液中溶解氧（DO）浓度的衰减。结果表明，由于生物反应器中的DO消耗低以及污泥的沉降速度低（主要在0.04 -0.08 m min（-1）的范围内），以适当的曝气间隔进行间歇曝气几乎不会降低污染物的去除效率。 ）。即使在相当短的SRT（6 d）下也可以有效去除高浓度的氨（类似于3 mg L-1）。随着SRT的增加，有机物和氨的去除效率增加，但膜污染也相应加剧。在中试规模的PAC-MBR中成功采用间歇曝气和短SRT，这意味着可以将结果外推到全面应用中，从而降低运行成本并减轻膜污染。 （C）2015 Elsevier Ltd.保留所有权利。

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