pollution level of yamuna in last 5 years
Answers
Explanation:
No significant improvement in the water quality of the Yamuna has been seen with respect to dissolved oxygen (DO), pH, biochemical oxygen demand and faecal contamination between 2015 and 2020, reveals an analysis by Central Pollution Control Board.
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The National Green Tribunal-appointed Yamuna Monitoring Committee had asked CPCB and Delhi Pollution Control Committee to conduct a trend analysis of the water quality during this period to understand whether numerous efforts at setting up and upgrading sewage treatment plants are having any effect on it.
The committee, in its latest report to NGT, said “the analysis by both CPCB and DPCC clearly does not point to a trend towards improvement in water quality”.
As per CPCB, “Based on the data, it can be interpreted that the water quality of Yamuna in Delhi stretch continues in poor state with respect to BOD during 2015-2020. High faecal values contribute to the deteriorated water quality, indicating high faecal contamination.”
It added that DO in the river was found satisfactory only at Palla before entering Delhi. “Downstream Palla, the quality degenerates. This stretch remains non-complying... Depletion of DO level in Yamuna till Okhla was due to the demand for DO from organic matter or discharge of untreated sewage or other effluents into water. Few instances of algal bloom or eutrophication are also observed, indicating high organic load.”
In its report to the committee after analysing the water quality at five stations in 2020, CPCB stated, “Sudden drop in BOD values from 57 mg/litre in March this year to 5.6mg/litre in April at Nizamuddin are attributed to the lockdown due to Covid-19, which led to shutdown of industrial activities.”
CPCB also observed that the period of June-August was critical during which the spike was seen, while November and December recorded higher faecal contamination values. The maximum faecal contamination was observed at Nizamuddin, indicating discharge of high quantity of untreated sewage.
After checking both reports, the committee told NGT that the analysis by “CPCB and DPCC clearly does not point to a trend towards improvement in the water quality. This concern needs to be conveyed to the important stakeholders, namely, National Mission for Clean Ganga, Delhi government for their information and to critically examine the issues involved and take remedial steps”. The two-member committee comprises B S Sajwan and Shailaja Chandra.
“No improvement has been observed in the water quality due to discharge of untreated sewage and improper functioning of effluent treatment plants,” said an official.
On December 6, CPCB asked DJB to submit an action plan to ensure that STPs follow norms and no untreated sewage is discharged into drains. CPCB also directed DPCC to take action against non-complying effluent treatment plants and industrial units.
A DPCC official, however, claimed, “As no change in water quality has been observed in the Yamuna in the past five years, it means that the river pollution has not deteriorated. Joint efforts taken by several agencies have ensured that the water quality has not worsened.”
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