DHAKA, Sept. 5 (Xinhuanet) -- The Bangladesh Environmental Management Project (BEMP)
has invented a sustainable technology to treat industrial wastes discharge
particularly by the textile and dyeing industries creating a great scope of
The method, operated by minimum machinery to separate dyeing sediments and
liquid wastes of the fabrics-dyeing mills, is also proved to be
environment-friendly apart from being a cheaper-than-hi-tech technology of waste
treatment, local daily New Age reported on Monday.
Sye M Iqbal Ali, Director of BEMP, narrated the process of developing the
The salient features of the technology are demonstration of good house
keeping practices, waste minimization through reuse of dyes and chemicals, and
process modification, pre-treatment of effluent and settling, treatment of
pre-treated effluent through areed-bed and management of sludge in
environmentally sound manner,Ali was quoted as saying by the daily.
In this process, liquid textile waste is filtered through several layers
that separate a large portion of dyeing chemicals. BEMP sources said that 75
percent of the fresh dye solution used in dyeing could be recovered for
Then the flow of the wastes is pressed to enter into a reed-bed,a
constructed wetland of several layers consisting of brick chips,sand, tiny
stones and soil atop where selected vegetation is cultivated.
According to the daily, the experiment found that some typical wetland
vegetation in Bangladesh like nalkhagra, keya, bamboo, murta are highly suitable
for absorbing the soluble contaminants from the reed-bed with at least three
feet deep cluster roots.
Later, the reed-bed drains clean water through the way oppositeto the
entering side of polluted water. Beside, the sediment that was filtered first is
burnt carefully to make sludge, which can beused in making bricks after mixing
with mud or cement.
Iqbal Ali said that the experimental project costs 450,000 taka(about 6,900
US dollars) only.
Now the government plans to introduce the technology in all of the
industries that produce a lot of liquid wastes.
Environment and Forest Minister Tariqul Islam said, "This local technology is affordable by the small and medium-scale entrepreneurs. These plants are capable of serving almost all hi-tech treatment plants." Enditem