Pollution levels down by 30 per cent
However, following the Covid-19 lockdown there are signs the holy river is being rejuvenated with increased signs of biodiversity.
Professor BD Tripathi, chairman of the Mahamana Malaviya Research Centre for Ganga, River Development and Water Resource Management recently tested the biochemical oxygen demand (BOD) and dissolved oxygen (DO) level in the Ganga.
He said water pollution has decreased by as much as 25-30 per cent during the lockdown.
He told the Hindustan Times: “We found that the concentration of dissolved oxygen increased by 20 per cent to 30 per cent in Ganga water and the concentration of biochemical oxygen decreased from 35 per cent to 40 per cent.”
以及恒河，有清洁和更清洁的天空的迹象wildlife flourishing in the Venice canalsfollowing lockdowns across the world.
Sustaining the improvements
Himanshu Thakkar coordinator at South Asia Network on Dams, Rivers & People (SANDRP) said the state of Ganga has significantly improved in the lockdown period at most locations along the main stem and several tributaries.
他告诉Aquatech在线:“很多因素responsible, the major ones being stopping industrial effluents, a huge reduction in socio-cultural load and some increased flow due to above average pre-monsoon rains.”
“To sustain this improvement, the government needs to ensure that no untreated or even semi treated industrial effluents enter the river.”
“The changes needed are in terms of improving transparency, participatory management and accountability of these bodies as also of the urban municipal bodies. In addition, a lot of work is required to reduce the demand for water so that there are greater freshwater flows in the rivers."
基金会ARK2030等外部机构已拨出东南亚 - 特别是恒河 - 作为需要救援的五个关键全球景观之一。
In an interview with Aquatech Online, Stephen Fern, chairman of Ark2030, asked: “Has anyone looked at the Ganges from its multiple points to when it enters the ocean and what can be done to clean it up?”
他说：“从来没有一个战略计划。我们相信，如果我们可以从恒河学习课程 - 这是10个顶级河流占海洋中污染物的95％的课程之一 - 我们可以解决根源的问题。首先将塑料停止进入海洋，这意味着我们可以停止在收集浪费的海洋周围拖网。“
蕨类植物解释说,该基金会打算invest in a one-year programme that involves “identifying strategically” the core elements of the materials that end up in the Ganga’s water at the mouth of the estuary.
“Once those things are identified, you look holistically at what can be done; whether it’s legislation or government action on enforcement with legislation. Look at how the Thames has been cleaned up in the UK. You need water authorities and legislation to bring water to life again.”
With its river basin measuring more than one million square kilometres in size, and home to over 650 million people, the pollution in Mother Ganges has a devastating effect on those who rely on the river to supply them with water.
In early February 2019, Banaras Hindu University (BHU) carried out a study on dissolved oxygen in the Ganges.
It found that high amounts of organic carbon and oxygen-demanding chemicals such as ammonia, iron and manganese are flushed into the river from different sources.
Jitendra Pandey, a member of the research team at BHU, reportedly said at the time: “Our results suggest that for rejuvenation of Ganga, authorities should also focus on the reduction of chemical oxygen demand along with the biological oxygen demand to enhance the ecological assimilation capacity of the river.”
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