The Chandigarh Pollution Control Committee (CPCC) on Thursday analysed the samples of treated tertiary water which will be used to fill Sukhna Lake, and found suspended solids (TSS) and potassium hydrogen (PH) within permissible limits. However, the level of oxygen was found nil. A private firm has been hired to treat the tertiary water for a period of one month on a trial basis. The firm has installed its equipment at the Sector 28-based tertiary water distribution centre.
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UT director (environment) Santosh Kumar said that all the parameters except level of oxygen are within permissible limits, which is a healthy sign. He, however, said that there is a need to increase the level of oxygen in the water before being used to fill the lake. Kumar said that there cannot be much variation in the quality of water in the lake and quality of treated tertiary water.
CPCC will continuously analyse the water samples and if all the parameters — biological oxygen demand (BOD), total suspended solids (TSS), potassium hydrogen (PH) and chemical oxygen demand (COD) — are found to be within permissible limits, then the water will be used to fill the lake. A pipeline will be laid for supplying water to the lake.
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Over the years, the water level of the lake has been declining due to heavy silting and deficient rainfall in the past six years has added to the problem.
The high court had taken suo motu notice of the depletion in water level in Sukhna Lake in 2009 and since then had been monitoring the case. On the directions of the HC, the administration has also sought suggestions from Tricity residents for saving Sukhna. The proposal has also been submitted to amicus curiae in the case, advocate Tanu Bedi.
The Microbiology Department of Panjab University has also carried out a research project with UT department of environment.
Dr Naveen Gupta, principal investigator, research project, has devised a technology to render the treated tertiary water safe from eutrophication so that it can be added to Sukhna Lake.
In a comparative study made, the treated tertiary water was found to be as good as Sukhna Lake water itself with respect to chemicals, biological oxygen demand, chemical oxygen demand, density and total suspended materials.