生物预处理中的微型动物分布与控制

微污染源水的生物预处理已有应用实例,弄清生物膜上的微型动物状况对于工程设计和运行十分必要。研究表明,生物预处理工艺中的微型动物种类和数量均沿水流方向逐渐减少,与污水生物处理中的微型动物分布差异较大。根据处理池内微型动物种类和数量的沿程变化规律来判断运行效果是较好的方式。苔藓虫是微污染源水生物预处理工艺中特有的微型动物种类,当它在生物膜上正常生长时有助于提高生物净化效果;当其暴发性生长并对运行影响较大时,可利用强制水力冲洗的办法将其清除。采用悬浮填料代替固定式捆绑填料,可以避免苔藓虫或椎实螺的大量生长。

Distribution and Control of Microzoons in Bio-pretreatment Process

Biological pretreatment of micropolluted source water has been applied in practice, and it is necessary to make clear the activity of microzoons growing on biofilm for the design and operation of the bio-pretreatment project. The study shows that the categories and numbers of microzoons are reduced gradually downwards the bio-pretreatment pond, and are different from that in biological wastewater treatment. The varying tendencies of the categories and numbers can be used as one of the indicators for evaluating the running effect. Bryozoan appears specifically in polluted raw water bio-pretreatment process, and it is helpful to improving bio-purification effect when growing normally. Pressed water rinsing can rid it from packing, when it is out-breaking growing and threats the running effect. Suspended carrier is a good alternative to replace fixed elastic packing to avoid its abnormal growing.