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Wastewater biofilters used for advanced treatment of papermill effluent

机译：用于造纸厂废水深度处理的废水生物滤池

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The application of tertiary biofilters - submersed aerated upflow filmreactors - can be classified as follows: 1. treatment of biologically treated wastewater with BOD below 25 mg/l; 2. treatment of biologically treated wastewater with BOD between 20 and 50 mg/l; 3. treatment of biologically treated wastewater with BOD below 30 mg/l followed by partial oxidation with ozone, resulting in BOD of up to 80 mg/l. These three types have to be discussed seperately. Conditions in these plants are quite different from the well-known secondary biofilters following chemical-mechanical pretreatment. The differences have to be regarded in design and operation of the plants. Several questions still have to be evaluated. Based on operational experience about details of microbiota, biofilm growth and attachment, treatment efficiency and stability of elimination, virtual independence of COD elimination from BOD elimination, retention of suspended solids, criteria for design and operation of these plants are discussed. Biofilters following the ozonation plants after biological treatment are quite different to operate. Special points of view to be taken into account at this are: no entry of microorganisms, possible ozone influences, inert solids produced in ozonation (mainly oxalate). These items are discussed based on experimental results.
机译：三级生物滤池的应用-潜水曝气上流膜反应器-可以分类如下：1.生物需氧量低于25 mg / l的生物处理废水的处理; 2. BOD在20至50 mg / l之间的生物处理废水的处理; 3.用低于30 mg / l的BOD处理经过生物处理的废水，然后用臭氧进行部分氧化，从而使BOD高达80 mg / l。这三种类型必须分别讨论。这些工厂中的条件与化学机械预处理后的众所周知的二级生物滤池完全不同。在工厂的设计和运行中必须考虑差异。仍然有几个问题需要评估。基于有关微生物群，生物膜生长和附着，处理效率和清除稳定性，从BOD清除中消除COD的虚拟独立性，悬浮固体的保留，这些植物的设计和操作标准等方面的操作经验，进行了讨论。经过生物处理的臭氧化工厂之后的生物滤池在操作上有很大不同。在此要考虑的特殊观点是：禁止微生物进入，可能的臭氧影响，臭氧化过程中产生的惰性固体（主要是草酸盐）。这些项目是根据实验结果进行讨论的。

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