Introduction:
A manhole is an opening in a street or sidewalk that provides access to an underground utility or infrastructure, typically a sewer, storm drain, or utility vault. It is usually covered with a heavy metal lid that can be removed to allow entry for maintenance or inspection purposes. Manholes are designed to provide a safe and convenient way for workers to access underground systems for repairs, cleaning, or installation of new infrastructure. The term “manhole” is derived from the fact that historically, the openings were large enough for a person to enter. Still, nowadays, many manholes are smaller and may only allow equipment or specialized personnel to enter.
As the world increasingly prioritizes sustainability and environmental protection, Korea is also focusing on eco-friendly solutions within its industrial framework. The adoption of gate valves made from sustainable materials, as well as those designed to minimize leakages and emissions, is becoming more prevalent in response to stringent environmental regulations.
In urban environments, garbage smell has far-reaching implications for public health and well-being. Exposure to strong odors can cause headaches, nausea, and overall discomfort, especially for sensitive individuals. Furthermore, the presence of garbage can attract pests and vermin, leading to additional health risks and an increased burden on local sanitation services. The unpleasant experience of encountering garbage smell can also impact the quality of life for residents, making public spaces less enjoyable and deterring outdoor activities.