June 27, 2013
Jisha Surya
Thiruvananthapuram: The much awaited Sewage Treatment Plant (STP) at Muttathara began functioning on Wednesday. After a week-long trial run using water, sewage was pumped to the intake chamber of the STP for the first time by around 1 pm. The plant, spreads over 36 acres, treats the sewage water using activate sludge process.
According to the officials, though the plant has begun operations in full swing, the first three months will be considered as trial period. Though the original capacity of the plant is 107 million litres per day, only 42 mld sewage reach the STP from the core areas of the city. Sewage pipes will be connected to other areas within two years, officials said. So far Rs 89 crore has been spent on the plant. The total cost of the plant is estimated to be Rs 333 crore.
According to technical officer of STP A Mudhusoodhanan, sewage water is treated using activated sludge process, a biological method where oxygen is introduced into the water to activate growth of microorganisms like bacteria to decompose waste. The 36-acres built-up space of the plant has various chambers to process the waste water. According to officials, the large suspended particles in the sewage will be removed from the pump house before it reaches the intake chamber of the plant. From the intake chamber, it moves to the screening chamber where small suspended particles of size 0.5 mm will be removed. It then moves to the grits chamber, where long rotating blades will sweep grits which settle down in the bottom of the chamber.
The waste water then moves to the aeration tank where the water is allowed to fall in a rotating motor. The water gets splashed so that it gets contact with oxygen. Oxygen helps in growth of bacteria responsible for discomposing the waste. The aerobic treated water will move to clarifier where the waste will settle in the middle due to rotation of water. The waste will be collected and remaining effluent will be treated before releasing it into Parvathy Puthanar. The effluent will be treated in a process called super chlorination. The remaining sludge will be thickened and dried using a filter bed during summer and centrifuge during rainy season. There are two screen chambers, two grit chambers, four aeration tanks and eight motors in the plant.
When asked about the efficiency of the plant, the officials said that it could be assessed after the formation of sludge. “It would take more time to grow bacteria in the sewage water so that it could decompose the waste. The sludge will be formed by around 30 days,” he said.
Officials from the funding agency, Kerala Sustainable Urban Development Project, and Kerala water authority’s Jawaharlal Nehru National Urban Renewal Mission reviewed the work. Construction of STP began in 2009 by Noida-based UEM Group. The firm will be responsible for the maintenance of the plant for the next five years.
Jisha Surya
Thiruvananthapuram: The much awaited Sewage Treatment Plant (STP) at Muttathara began functioning on Wednesday. After a week-long trial run using water, sewage was pumped to the intake chamber of the STP for the first time by around 1 pm. The plant, spreads over 36 acres, treats the sewage water using activate sludge process.
According to the officials, though the plant has begun operations in full swing, the first three months will be considered as trial period. Though the original capacity of the plant is 107 million litres per day, only 42 mld sewage reach the STP from the core areas of the city. Sewage pipes will be connected to other areas within two years, officials said. So far Rs 89 crore has been spent on the plant. The total cost of the plant is estimated to be Rs 333 crore.
According to technical officer of STP A Mudhusoodhanan, sewage water is treated using activated sludge process, a biological method where oxygen is introduced into the water to activate growth of microorganisms like bacteria to decompose waste. The 36-acres built-up space of the plant has various chambers to process the waste water. According to officials, the large suspended particles in the sewage will be removed from the pump house before it reaches the intake chamber of the plant. From the intake chamber, it moves to the screening chamber where small suspended particles of size 0.5 mm will be removed. It then moves to the grits chamber, where long rotating blades will sweep grits which settle down in the bottom of the chamber.
The waste water then moves to the aeration tank where the water is allowed to fall in a rotating motor. The water gets splashed so that it gets contact with oxygen. Oxygen helps in growth of bacteria responsible for discomposing the waste. The aerobic treated water will move to clarifier where the waste will settle in the middle due to rotation of water. The waste will be collected and remaining effluent will be treated before releasing it into Parvathy Puthanar. The effluent will be treated in a process called super chlorination. The remaining sludge will be thickened and dried using a filter bed during summer and centrifuge during rainy season. There are two screen chambers, two grit chambers, four aeration tanks and eight motors in the plant.
When asked about the efficiency of the plant, the officials said that it could be assessed after the formation of sludge. “It would take more time to grow bacteria in the sewage water so that it could decompose the waste. The sludge will be formed by around 30 days,” he said.
Officials from the funding agency, Kerala Sustainable Urban Development Project, and Kerala water authority’s Jawaharlal Nehru National Urban Renewal Mission reviewed the work. Construction of STP began in 2009 by Noida-based UEM Group. The firm will be responsible for the maintenance of the plant for the next five years.
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