Nigeen lake gets maiden STP

Based on state-of-the-art SBR technology

ARIF SHAFI WANI

Srinagar, Mar 19: In a bid to prevent influx of sewage into the Nigeen lake, the state Government has constructed a state-of-the-art maiden Sewage Treatment Plant (STP) at Nallah Amir Khan in the City.
 The STP with a capacity to treat 5.4 million litres of sewage per day has been constructed by the Lakes and Waterways Development Authority (LAWDA) through Thermax India (Ltd) —considered an authority in sewage management solutions.
 Officials said the STP is based on the latest technology Sequential Batch Reactor (SBR), which has proven efficiency to treat sewage even in sub-zero temperature is best suited for hostile climatic conditions in winter here.
 “Construction of the STP has been completed and we have started its pre-commissioning testing,” Tariq Ahmad Assistant Executive Engineer Lake Division II LAWDA told Greater Kashmir.
 Constructed at a cost of over Rs 12 crore, the STP would cater to a population of 34,400 in various areas in Nigeen lake including Lal Bazar, Baghwanpora, Mughal Mohalla and Leper Hospital.
 In absence of STP, sewage of various areas around Nigeen lake emptied into the waterbody. Experts maintain that due to heavy inflow of sewage, Nigeen lake turned euthrophic over decades ago and some of its parts have high concentration of organic matter—which is fatal for some species of fish particularly Crossocheilus Diplochilus and Gambusia Assinis.
 Last year these fish species died in thousands in Nigeen lake. While experts blamed change in the physico-chemical parameters of Nigeen waters propelled by high pollution levels, the LAWDA scientists ascribed it to ‘fish kill’ phenomena caused to depletion of oxygen due to cloud cover.
 “We have diverted majority of the drains of these areas with the STP. We will also connect 63 houseboats on western fringe of the lake with the STP. It will take for culture (bacteria) development in the STP,” Tariq said. “This STP will help to restore Nigeen lake to its pristine glory,” he added.
 Construction of another STP based on SBR Technology is in full swing at Brari Nambal, a part of Dal Lake. Officials said to ensure construction of the news STPs according to the prescribed parameters, scientists from the Indian Institute of Technology New Delhi and are monitoring it as third party evaluators.
 “The Nallah Amir Khan STP has a retention time of nearly 19 hours, which facilitates through treatment of the sewage. Every part of the STP has a standby. This would facilitate maintenance of the STP even while operating it. The STP is fully automated and is wholly controlled by a Programme Logic Control,” said Waseem Sheikh, Residential Construction Manager, Thermax India (Ltd).
 He said the company will operate and maintain the STP for two years. “Simultaneously, we’ll train the LAWDA people to operate it,” he added.
 The STP has been constructed on the recommendations of the Alternate Hydro Energy Centre Roorke which has prepared the Dal-Nigeen Conservation Project. Three STPs based on the Fluidized Aerobic Bio-reactor (FAB) technology have already been constructed at Hazratbal, Nishat and Habak. However, officials said the FAB can’t wholly treat nitrogen and phosphorous which facilitate growth of obnoxious weeds in Dal Lake.
 The LAWDA plans to upgrade its STPs with nitrification units based on SBR technology.
 Pertinently, acting on directions of the Jammu and Kashmir High Court, a team of scientists from the prestigious National Environmental Engineering Research Institute (NEERI) recently evaluated three STPs around the Dal lake and it will soon give its recommendations for their effective functioning.

Lastupdate on : Tue, 19 Mar 2013 21:30:00 Makkah time
Lastupdate on : Tue, 19 Mar 2013 18:30:00 GMT
Lastupdate on : Wed, 20 Mar 2013 00:00:00 IST




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