Bangladesh has developed a low-cost wastewater treatment technology

It is reported that the Meng Environmental Management Project Team has recently developed a low-cost sewage treatment technology that can separate sediment and liquid from the sewage discharged from the printing and dyeing plant. Tests have proven that the technology is cost-effective and is very environmentally friendly.

 

According to the Meng Environmental Management Project Team, the technology is characterized by separating the chemical dyeing substances in the sewage for reuse. The sewage discharged from the printing and dyeing plant is first filtered through several layers, and 75% of the chemical dyeing substances can be separated. These precipitates can be fired into mud and added to the cement to form bricks.

 

According to reports, after the first filtration, the remaining sewage is introduced into a "reed bed" for re-filtration. The “reed bed” is a constructed wetland of multiple filter layers made of brick, sand and small stones. The upper layer is the soil layer and some specific vegetation is planted. The experiment found that some typical wetland vegetation in Bangladesh has a particularly strong absorption capacity for soluble pollutants contained in the “reed bed”. After filtering through the “reed bed”, it can discharge clean water.

 

This experimental project cost only 450,000 taka (about $6,900). Currently, the Bangladesh government plans to extend this new technology to all industries that involve large amounts of wastewater.

 

The Ministry of Environment and Forests Tariq? Islam said that this technology is cheap, so SMEs have the ability to use it.