Stability is an important characteristic of anaerobic wastewater treatment systems, environmental and wastewater composition variations are usual causes of instability.

稳定性是废水厌氧生物处理系统的重要特性，环境和水质条件变化是常见的失稳致因。

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There is many kinds of medical wastewater with complicated organic composition such as Heterocyclic aromatic which is difficult to be degraded.

高盐医药废水种类很多，并且成分复杂，某些废水含有许多难以降解的杂环芳烃等有机物。

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The CODcr degradation is more difficult because acidizing wastewater contains many kinds of additives in which the composition of most organic matters is complicated.

油田酸化废水由于所含添加剂种类繁多，且有机成分复杂，使COD值的降解难度增大。

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