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    Underground Utility Tunnel

    The situation in underground spaces is quite complex, as many drainage points face significant challenges in managing wastewater effectively. If traditional gravity-based systems were used, the associated civil engineering costs could become quite high. In contrast, vacuum drainage systems offer greater flexibility in installation, helping to significantly reduce these construction expenses. Moreover, underground spaces are inherently enclosed environments, making it easier for odors from kitchen waste and restroom sewage to accumulate. This not only contaminates indoor air quality but also negatively impacts the overall business atmosphere, severely affecting the operational environment down there—making vacuum drainage an important consideration for such settings. Finally, another major issue in underground commercial and dining areas is the frequent clogging of drainage systems. Restaurant wastewater often contains heavy grease, which can solidify against pipe walls when cooling or moving slowly. Over time, this buildup leads to blockages that are both difficult and costly to repair. Additionally, the trapped grease can breed bacteria, causing unpleasant odors and attracting pests like mosquitoes and flies. In contrast, vacuum drainage systems address these problems far more effectively. By utilizing a gas-liquid two-phase flow, vacuum drainage ensures high wastewater velocities—typically ranging from 4 to 7 meters per second—which provide powerful flushing action and minimize the risk of clogs. As a result, beyond just restrooms, vacuum drainage is increasingly being adopted by underground commercial and dining facilities to efficiently collect even oily wastewater.