Shi Xiao-hui, Liu Fang, Liu Hong, Zhu Jian-rong
School of Environment, Beijing Normal University, Beijing 100875, China.
Huan Jing Ke Xue. 2007 May;28(5):1026-32.
The key cultivation strategy for aerobic granular sludge cultivation was investigated using feed loading control as a main operational parameter in an aerobic/anaerobic SBR system. The results showed that the feed loading by influent COD 0-900 mg x L(-1) could effectively control the growth of sludge. The settling characteristic of inoculated sludge was important for aerobic granules formation, and its SVI 20-50 mg x L(-1) was favourable to granulation development process. Pure aeration without substrate feeding can greatly improve the settleability of sludge, and stimulate the granulation process. The activated sludge with good settleability could be converted to completely aerobic granular sludge through reducing operational loading in a certain condition. The granulation process occurred in COD feeding 400-500 mg x L(-1), and sludge concentration 8-10 g x L(-1). The developed granules were approximately 1.0 mm in diameter, SVI 25-35 mg x L(-1), settling velocity 60 m x h(-1). The authors proposed that granulation formation process was attributed to a unique operational mode in SBR system, i.e. the famine-feast alternation of substrate in reactor. The control strategy of organic loading by reducing substrate could enhance the variation of famine-feast in substrate, and made the driving force for granulation development.
在好氧/厌氧序批式反应器（SBR）系统中，以进水负荷控制作为主要操作参数，研究了好氧颗粒污泥培养的关键培养策略。结果表明，进水化学需氧量（COD）为0 - 900 mg·L⁻¹时的进水负荷能够有效控制污泥的生长。接种污泥的沉降特性对好氧颗粒的形成很重要，其污泥体积指数（SVI）为20 - 50 mg·L⁻¹有利于颗粒化发展进程。不投加底物仅曝气能极大地改善污泥的沉降性能，并促进颗粒化进程。在一定条件下，通过降低运行负荷，沉降性能良好的活性污泥可转化为完全好氧颗粒污泥。颗粒化过程发生在COD投加量为400 - 500 mg·L⁻¹、污泥浓度为8 - 10 g·L⁻¹时。形成的颗粒直径约为1.0 mm，SVI为25 - 35 mg·L⁻¹，沉降速度为60 m·h⁻¹。作者提出颗粒化形成过程归因于SBR系统中一种独特的运行模式，即反应器内底物的饥饿-饱食交替。通过减少底物来控制有机负荷的策略能够增强底物中饥饿-饱食的变化，并成为颗粒化发展的驱动力。
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