但它们运转费用低，大大抵消了建设费。
此工艺操作方便、运转费用低，且无二次污染产生。
This processes have been low operational cost, simple operation and not to produce second pollution.
曝气设备是氧化沟处理工艺中最关键的设备，其性能的好坏直接影响到氧化沟工艺的处理效果和运转费用。
As a key equipment, the property of aeration devices is essential to the performance and expenses of oxidation ditch.
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