Air blower aeration was adopted in Shaoxing Wastewater Treatment Plant, where exist some disadvantages, such as the falling-off of blind lid from aerated pipe and malfunction of drainagesystem.
绍兴污水处理厂采用鼓风曝气，在运行过程中存在曝气管盲盖脱落现象，排水系统也存在缺陷。
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The drainagesystem in Qingxi Hydropower Plant originally adopted conventional relay control for its pump control system, which had many hidden troubles and resulted in multiple failures.
Closure cover system is one of important parts of landfill site construction, it includes landfill gas discharge guiding layer, geotechnical film, drainage layer and plant cover surface soil layer.