Kolkata, May 10, 2017: The West Bengal Pollution Control Board has ordered a complete ban on sale and use of firecrackers generating noise of more than 90 decibels, an official said on Wednesday.
“The maximum permissible noise level of the firecrackers at the time of bursting within the state must not exceed 90-decibel impulse noise at five metre from the source,” board chairman Kalyan Rudra said.
The fresh orders are in conformity with the directive issued by the National Green Tribunal.
As per the order, “there shall be complete ban on sale and use of firecrackers generating noise more than 90 decibel impulse at a distance of five metre in Bengal.”
The directive also calls for barring bursting sound emitting firecrackers between 10 p.m. to 6 a.m.
“There shall be complete ban on bursting of any kind of firecrackers in silence zones,” the order said. (IANS)
Scientists in Britain and the United States say they have engineered a plastic-eating enzyme that could help in the fight against pollution.
The enzyme is able to digest polyethylene terephthalate, or PET — a form of plastic patented in the 1940s and now used in millions of tons of plastic bottles. PET plastics can persist for hundreds of years in the environment and currently pollute large areas of land and sea worldwide.
Researchers from Britain’s University of Portsmouth and the U.S. Department of Energy’s National Renewable Energy Laboratory made the discovery while examining the structure of a natural enzyme thought to have evolved in a waste-recycling center in Japan.
Finding that this enzyme was helping a bacteria to break down, or digest, PET plastic, the researchers decided to “tweak” its structure by adding some amino acids, said John McGeehan, a professor at Portsmouth who co-led the work.
This led to a serendipitous change in the enzyme’s actions — allowing its plastic-eating abilities to work faster.
“We’ve made an improved version of the enzyme better than the natural one already,” McGeehan told Reuters in an interview.
“That’s really exciting because that means that there’s potential to optimize the enzyme even further.”
The team, whose finding was published Monday in the Proceedings of the National Academy of Sciences journal, is now working on improving the enzyme further to see if it could be capable of breaking down PET plastics on an industrial scale.
“It’s well within the possibility that in the coming years we will see an industrially viable process to turn PET, and potentially other [plastics], back into their original building blocks so that they can be sustainably recycled,” McGeehan said.
Independent scientists not directly involved with the research said it was exciting, but cautioned that the enzyme’s development as a potential solution for pollution was still at an early stage.
“Enzymes are non-toxic, biodegradable and can be produced in large amounts by microorganisms,” said Oliver Jones, a Melbourne University chemistry expert. “There is strong potential to use enzyme technology to help with society’s growing waste problem by breaking down some of the most commonly used plastics.”
Douglas Kell, a professor of bioanalytical science at Manchester University, said further rounds of work “should be expected to improve the enzyme yet further.”