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Japanese technology to be used for sewage treatment

Special Correspondent

Project that helps eradicate mosquitoes launched in Alandur

Photo: A. Muralitharan

NEW TOOL: Eco Bio Blocks being used in the treatment of sewage water as part of a project launched in Alandur Municipality. —

TAMBARAM: A pilot project on ‘using Eco Bio Block for treatment of sewage water and eradication of mosquitoes’ was launched in Alandur Municipality on Monday.

The use of a bio-remediation technology for treating sewage is reportedly the first of its kind, said senior officials of the Department of Municipal Administration and Water Supply.

During a presentation on Monday, representatives from Ariake Bio-techsolutions Pvt Ltd, told councillors that the Eco Bio Blocks (EBB) from Japan were manufactured from volcanic ash found abundantly there. They were mixed with cement and “useful bacteria” (Bacillus) and once placed inside open sewers or pits, the blocks would start reacting.

They said the blocks worked on the principle of “natural way of cleaning water” by absorbing pollutants and removing bad odour. They said the concept of EBB method of cleaning sewage was popular in Japan and many South East Asian countries and was slowly emerging as a viable alternative in the Indian sub-continent too.

The Central Pollution Control Board had issued its report for a pilot project using EBB that was conducted on an open drain in Mayur Vihar, New Delhi, in July last year. The report said there was a drastic reduction in the content of total suspended solids and chemical oxygen demand.

The company’s representatives said that though Alandur Municipality had a full-fledged underground drainage network, sewage from commercial establishments and houses found their way into open spaces. Treatment of sewage using EBB could prevent pollution, they said, adding this one-time investment would cut off huge power bills and maintenance costs compared to treatment plants.

Municipal Chairman R. S. Bharathi launched the pilot project in the presence of officials and councillors of the local body. The project has been launched at two locations. The first one, at a sewage pit near the railway station, where 22 blocks — each weighing around 700 grams — have been placed inside it.

The other location is Madhava Perumal Temple Street, where 60 blocks have been placed in an open drain for a distance of 250 metres.

Samples have been collected and their results would be seen after a couple of weeks.

Results would be analysed and the possibility of implementing it could be made only after an approval from the municipal council and the State government, municipal engineer N. Mahesan said.

The private company’s representatives said EBB’s immediate result was the killing of larval mosquitoes, while it would take some days to reduce the rate of total suspended solids, nitrates, phosphates and to remove colour and foul smell.

This was possible due to the presence of Bacillus bacteria that could survive in water with low PH values.

The blocks could be used in houses too, they added.

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