Stability is an important characteristic of anaerobic wastewater treatment systems, environmental and wastewatercomposition 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。
2
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。
3
The CODcr degradation is more difficult because acidizing wastewater contains many kinds of additives in which the composition of most organic matters is complicated.