New technology to treat sewage

Anaerobic method of treating sewage has been introduced in Mysore.

Anaerobic method of treating sewage has been introduced in Mysore.   | Photo Credit: — PHOTO: M.A. SRIRAM

Shankar Bennur

It has been introduced on an experimental basis at two STPs in Mysore

MYSORE: A new technology has been introduced at the sewage treatment plants (STPs) at Sewage Farm in Vidyaranyapuram and Kesare off Bangalore-Mysore highway here on an experimental basis to recycle domestic wastewater to save electricity consumption by up to 90 per cent and reduce sludge production.

If the technology was found to be feasible, the treatment plants will incorporate it for treating sewage and discontinue use of aerators, which are being used at present to recycle wastewater.

Fermentative Anaerobic Baffle Reactor (FABR) technology has been introduced for the first time in Mysore after the establishment of STPs.

Once the technology is operational, common complaints of foul smell emanating from the plants could be overcome, according to the officials of Vani Vilas Water Works (VVWW).

“The technology is nothing but using beneficial microbes to treat waste instead of depending on electricity,” VVWW Executive Engineer Raju said.

He said VVWW paid up to Rs. 8 lakh for electricity consumed by each STP for inducing oxygen for removing organic matter from wastewater. But if the Organic Solutions’ Effective Micro-organisms (OS1), a liquid concentrate of specially cultured micro-organisms living and working synergistically together in a unique environment, were released into wastewater, they recycled wastewater without running aerators, thereby reducing organic matter, he said.

Two private agencies, which have expertise of implementing the technology, have begun preliminary work on introducing the technology at the 67.5 MLD-capacity Sewage Farm and 30 MLD-capacity treatment plant at Kesare.

According to a literature provided by VVWW with the title, “Organic solutions, revolutionising wastewater and solid waste treatment”, the technology was first introduced to the world as Effective Micro-organisms (EM) method. It is now being used in the country for wastewater treatment, solid waste treatment, etc., under the name of “OS1”.

The foul smell emanating from the plants is nothing but H2S and NH3. The addition of OS1 in STPs reduces the release of gases – OS1 breaks down H2S and NH3 in elemental form releasing sulphur and nitrogen from other elements and OS1 dominates over pathogens (which cause foul smell) reducing their numbers, and thus, reducing foul smell.

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