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Water Treatment

Corpn. to go ahead with STP project in Ondipudur

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The Hindu              22.05.2013

Corpn. to go ahead with STP project in Ondipudur

Staff Reporter

In an attempt to quell speculations, Mayor S.M. Velusamy told journalists on Tuesday that the function scheduled on Monday last to mark the start of the sewage treatment plant (STP) construction was postponed because the Commissioner and he were not in town.

The postponement of the function had nothing to do with the residents’ protest, he clarified.

A group of residents from Sindhu Nagar, Bharathi Nagar, Noyyal Nagar and a few other areas staged a protest on Monday morning complaining that if the Corporation were to construct an STP, the area would get polluted and that they would be deprived of good ground water.

Mr. Velusamy said that the Monday’s protests were staged with an ulterior motive and that those who spearheaded the protests wanted to gain political mileage. The Corporation was determined to go ahead and construct the STP at the site in Ondipudur and also complete the same within the deadline.

The civic body would take strong exception to those trying to disrupt the construction and deal with them legally. It would also not hesitate to approach the police for legal action.


Ooty model of bio-remediation to save urban waterbodies

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The Hindu                  06.05.2013

Ooty model of bio-remediation to save urban waterbodies

There is a ray of hope for hundreds of urban waterbodies, victims of urbanisation and industrial pollution. A combination of bio-ozolyte treatment process and bio-remediation adopted by the State government to save the Ooty Lake, can be used to recover these polluted water bodies.

According to officials, phosphorus and nitrogen are responsible for the rapid growth of water hyacinth, that has invaded many water bodies. The bio-processes will increase the dissolved oxygen (DO), by bringing down the biochemical oxygen demand (BOD) and chemical oxygen demand (COD). DO improves quality of water and replenishes life in water bodies.

On Thursday, Chief Minister Jayalalithaa announced a Rs. 50 crore package for cleaning lakes in the State. But experts point out that the project could achieve success only by preventing people from dumping solid waste and debris into the water bodies.

While bio-remediation comes in handy for treating polluted lake water, bio-ozolyte process is used to treat waste water before being let into the water bodies.

“Since Tamil Nadu has utilized more than 96 per cent of surface water, there is no scope for new reservoirs of over one TMC [thousand million cubic feet] capacity to be built. For storing 1 TMC of rain water, the present cost is Rs. 200 crore,” said R. Elanogvan, Executive Engineer of the Public Works Department.

If urban waste water was treated, around 100 TMC water could be harvested. The total cost of treatment would be between Rs. 9,000 crore and 10,000 crore, which would be half the cost of a new reservoir construction, given the same capacity.

Mr. Elangovan, who was involved in cleaning the Ooty Lake through bio-remediation and bio-ozolyte method, said, “The advantage with the bio-ozolyte process is that it does not require standard design pattern and is flexible to club with any other technology.” This could be accommodated according to the site condition with power or without power, he noted.

One of the biological methods is using microbes (diatoms) available in powder, liquid and Eco Bio Blocks (EBB) infused with special natural micro organisms. EBB blocks are made of volcanic rock zeolite and cement infused with bacteria.

“We may need 250 to 500 blocks per 1 MLD [million litres a day] depending on the condition of the water,” he said.

An Indian technology of using microbes to inoculate the waste water treatment plant is also used. Microbes in the form of powder - 200 gram per 1 MLD - is added in the collection tank for stabilization process. Indian made powder (Bio clean or Nulagi) will be used for starting the process. This will reduce the sludge by degrading the organic matter.

Mr. Elangovan said the diatom would increase the plankton and zooplankton population, a stable diet for fishes. This process would also substantially increase the dissolved oxygen in water. Though water hyacinth was a ravaging weed, its presence ensured that water did not reek. But it would not allow penetration of sun light.

“This plant can be removed and used for generating bio-gas. We can harvest it in every three months,” he said.


Desilting work begins in Ukkadam

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The Times of India                 03.05.2013

Desilting work begins in Ukkadam

COIMBATORE: In an attempt to enhance the water storage capacity of Singanallur lake and Ukkadam Periakulam, two NGOs are carrying out desilting work at these lakes. The permission for the work was obtained from the district administration and city corporation and it is to be completed within the next 30 days. Siruthuli and Residents Awareness Association of Coimbatore (RAAC) are carrying out the desilting which officially began here on Thursday morning. "The work is being carried out as part of rejuvenation activities of city lakes," said R Raveendran, Secretary, Residents Awareness Association Coimbatore.

The permission was granted on the basis of a proposal to enhance the total storage capacity of both Ukkadam Periyakulam and the Singanallur lake and also strengthen its bunds. The corporation entrusted with the responsibility of maintaining the eight water bodies had earlier issued a No Objection Certificate to the organisation back on August 24, 2012. Following this, the proposal was forwarded to the State level Environmental Impact Assessment Authority for further approval. tnnHowever, special conditions have been issued from the state level committee citing that the silt recovered from the lakes should be deposited along the banks to be utilised for formation and strengthening of bunds. The recovered silt is also not to be utilised for any commercial purposes.

"We will launch the program on Wednesday at 10am along the Ukkadam lake," Raveendran added.

Last Updated on Friday, 03 May 2013 12:07

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