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The operating principle of the conventional catch basin system

Vietnam’s tropical climate is ideal for the development of many insects, including mosquitoes that carry diseases such as malaria, dengue fever, yellow fever, Japanese encephalitis, Zika.
The commonly used catch basins use the principle of preventing odors with water from the sewer system, so it always leaves a residual amount of stagnant water. Over time, this design has revealed many inadequacies. These issues have been raised by residents in all urban areas, and many studies all over the world have highlighted the drawbacks of conventional catch basin systems. However, there had not been any solution that can completely solve these problems until recently.

Odor pollution

Stagnant water turns into sludge and combines with many decomposed organic substances causing foul odors. In the dry season, this amount of water evaporates and loses its ability to prevent odors. Independent environmental assessments have demonstrated that the amount of air pollutants are 55 times higher than the permissible standards specified in QCVN 06.2009/BTNMT – National technical regulation on some hazardous substances in ambient air.
The foul odor from catch basins has a significantly negative impact on nearby households and businesses. Customers at the nearby restaurants and eateries usually have to sit far away from the catch basins to avoid the unpleasant odor. Therefore, people have used many materials such as tarpaulin and bricks to cover the catch basins to prevent foul odor. However, this practice inadvertently contributes to waterlogging issues during rainfall.

Slow water drainage

The complex design with suboptimal flow patterns hinders efficient water drainage, causing slow runoff during heavy rainfall and leading to flooding. The fact that people cover the catch basins to prevent odors contributes to aggravating the problem.
The picture beside shows Le Hong Phong Street in Vung Tau city, it had been constantly flooded BEFORE SiGen’s Mosquito-free Odorless Catch Basins were installed:

Ideal environment for mosquitoes

The conventional catch basin systems have been proven in many countries to be breeding environment for dengue-causing mosquitoes. In Vietnam, Pasteur Institute in Ho Chi Minh City concluded:“Catch basins are breeding grounds for larvae and mosquitoes, including the ones that transmit dengue fever.”.
The common solutions currently used worldwide involve the application of chemicals, seawater, or salt into catch basins to eradicate mosquitoes. However, these approaches share common characteristics of being costly, short-term effective, unsustainable, and not suitable for long-term implementation on a large scale.


SiGen’s Mosquito-free Odorless Catch Basin

SiGen’s Mosquito-free Odorless Catch Basin has been developed to comprehensively address all of the aforementioned issues. The solution has been implemented on many streets across the country and has demonstrated its superior effectiveness.

People’s complaints about the conventional catch basin systems

Experts’ opinions on the conventional catch basins