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Water Treatment

Despite court ban, manual cleaning of drains still on

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The New Indian express                02.05.2013

Despite court ban, manual cleaning of drains still on

As the world celebrates May Day seeking more rights for the working class, corporation workers in the city were spending the day in manholes, forced to manually remove blocks caused by plastic bags and garbage.

Despite stringent rules that no solid waste should be pushed down the drains, poor official implementation and the careless attitude of the public has led to a situation where even jet rodding machines are unable to clean the sewage blocks.

The State government has banned manual cleaning of drainages, following a Supreme Court direction. Subsequently, the city corporation purchased four jet rodders to stop manual cleaning of Under Ground Drainages (UGD). Though officials claim that these jet rodders alone are put to use in clearing blocks in drainages, manual cleaning has become the order of the day, due to the poor solid waste management sense of residents.

On an average, the sewage network in the city pumps about 56 million litres discharge to treatment plants at Panchapur. However, due to clogging in sewage lines, most of the days, the city roads especially, commercial hubs like the Central Bus Stand area and the Chathiram bus stand, sewage flows on the road posing health hazards for residents.

The City Corporation instructed all the hotels, commercial complexes and apartments in the city to have diaphragm chambers to filter silt, sanitary napkins, left over food items and other solid wastes, which cause frequent blocks in the underground drainage lines. However, only a few commercial establishments have complied to the order.

On Wednesday, the sanitary workers were seen engaged in manual cleaning of sewage lines and  a manhole at the Madurai road. The workers took out clothes, fibre, plastic and other solid materials that choked the free flow of sewage through the drainage line.

Since jet rodders cannot remove these kind of solid materials, the sanitary workers are forced to manually undertake the cleaning.

When asked whether they knew it was banned, they replied that the officials asked them to execute the work and hence, they were on duty.

However, the officials from the City Corporation maintained that only jet rodder machines were being used to clear blocks in drains. Corporation Commissioner PV Thandapani, said he would look into the issue. He said about 70 percent hotels and commercial establishments constructed diaphragm chambers, and the remaining 30 per cent would complete the work shortly.

“We are monitoring those yet to construct the diaphragm chambers in the City”, the Commissioner assured.


State’s first tertiary treatment plant for sewage at Koyambedu soon

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The Hindu                25.04.2013

State’s first tertiary treatment plant for sewage at Koyambedu soon

Currently, nearly 94 million litres of water a day are treated at the secondary treatment plant in Koyambedu —Photo: S.S. Kumar
Currently, nearly 94 million litres of water a day are treated at the secondary treatment plant in Koyambedu —Photo: S.S. Kumar

Chennai Metrowater will soon own the first-of-its-kind tertiary treatment plant in the State. The agency is in the process of finalising the design and treatment process of the facility that will reduce the amount of treated sewage let into waterways and also improve supply to industries.

The six-acre facility will be added to the existing sewage treatment plant in Koyambedu to treat the sewage another time to make it fit for industrial use.

The consultant, Engineers India Limited, is collecting data on the process to treat the sewage and also finalising the route to take the treated water from the plant to the industrial belt in Irungattukottai, Sriperumbudur and Oragadam.

Metrowater sources said the plant would reduce biochemical oxygen demand (BOD) and chemical oxygen demand in sewage to almost nil, a requisite for it to be used in industries. In the secondary treatment plants in Koyambedu, the BOD is reduced to 20 mg per litre from the nearly 350 mg/l found in the raw sewage.

The consultant is preparing a detailed project report for the plant a capacity to treat 45 million litres of sewage a day. “The design will be such that 60 mld of sewage can be treated in the future,” said an official.

The Koyambedu sewage treatment complex has two units that treat 94 mld. At present, the water agency supplies 37 mld to industrial units in Manali belt. Nearly Rs. 20 crore is generated through this. In order to meet the growing industrial demand, it was decided to recycle the water and provide it to the industries. The treated sewage will be conveyed through a 60 km pipeline to the industrial parks.

The consultant must also come up with project cost estimate and plans for funding pattern. The production cost of the treated water is estimated to be Rs.60 per kilo litre. The detailed project report and preparation of bids are expected to be completed in five months. Work on the tertiary treatment plant may start early next year.


Dumping yard for decade, pond gets lease of life

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The Hindu                25.04.2013

Dumping yard for decade, pond gets lease of life

Waterbody near West Tambaram set to be revived with desilting and other works. —Photo: M. Srinath
Waterbody near West Tambaram set to be revived with desilting and other works. —Photo: M. Srinath

A dense outgrowth of vegetation in a water body, while an eyesore, is a delight for miscreants.

With residents dumping refuse in it, the process of its gradual death is only speeded up. Not so in the case of the pond at Arputham Nagar along Tiruneermalai High Road, in Tambaram.

What was once an eyesore will soon become a bright, neat and a much sought-after landmark in Tambaram.

After a sum of Rs. 46 lakh was sanctioned in 2012, work on desilting the pond, strengthening its embankments, removing the dense vegetation around it, creating a pathway and installing safety railings had started towards the year-end, said S. Sivasubramanian, municipal commissioner.

All the rubble and garbage around the pond too were removed.

Like most small water bodies in the city’s immediate suburbs, the pond remained neglected for around a decade as a collection site for refuse of all forms, from homes, shops and construction sites.

“I have been a resident for more than two decades. Living closest to the pond, it was really pathetic to see it. The outgrowth of thorny bushes was the perfect cover for men to take refuge inside it after sunset,” said V. Perumal, a resident of Arputham Nagar.

Residents, including Mr. Perumal, had appealed to the municipality earlier to revive the water body, which, say residents, “was too precious” to them.

In 2012, the Tiruneermalai High Road, which for several years remained in a pathetic condition, was given a strong bitumen-topped surface. Soon after, Metropolitan Transport Corporation services were introduced between Tambaram and Poonamallee, via Tiruneermalai and Kunrathur.

“The sprucing of the pond has given the much needed facelift to the entire locality,” Mr. Perumal said. Care had been taken to prevent sewage from draining into the pond — both from houses as well as from the contaminated Ranganathapuram (Kadaperi) lake, Mr. Sivasubramanian said. Obstructions and filters too were in place to ensure only rain water enters the pond during monsoon.

Proposals were in place to spruce up a few more similar small water bodies in the rest of the municipality, including Adhi Nagar in East Tambaram, Mr. Sivasubramanian said.


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