Pollution load on Hussain Sagar dips

Officials say it is due to decentralisation of Ganesh idols immersion

By   |  Published: 7th Oct 2018  12:07 am

Hyderabad: Efforts by authorities to reduce pollution load on Hussain Sagar lake during Ganesh idol immersion seems to have started to yield positive results.

The Telangana State Pollution Control Board (TSPSCB) has found no significant change in the concentration of heavy metals during and after the Ganesh idol immersion period. The TSPSCB, after monitoring and analysing the data collected from Hussain Sagar during and after the immersion, said ‘due to decentralisation of Ganesh idols immersion, the impact of pollution load is reduced on the Hussain Sagar”.

The monitoring was carried out at six different locations i.e. two locations at NTR Park and one each in Lumbini Park, Necklace Road and Buddha Statue.

 

Measuring of vital parameters of lake ecosystem, including Biochemical Oxygen Demand (BOD), Dissolved Oxygen (DO), pH levels, turbidity, the presence of heavy metals such as chromium, copper, zinc and lead were carried out by the PCB during the immersion.

In general, at all the monitoring locations, the Dissolved Oxygen (DO) values were high and gradually decreased to nil during the immersion period. Dissolved Oxygen is vital for the survival of aquatic life in lakes. The DO levels, however, started to improve after the immersion was completed.

Similarly, the BOD levels too were on the higher side during the immersion period when compared to before and after immersion at all the six locations. The monitoring of Hussain Sagar also indicated higher values of fecal coliform during the immersion. At all the immersion points, the BOD levels before immersion hovered between 41 milligrams per litre (mg/l) and 52 mg/l. After immersion, the BOD levels increased to 108 mg/l before reducing to earlier levels.