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Indian Institute of Science BANGALORE (2021)

Integrated Wastewater Management for Tank Restoration in Urban Fringe Areas

Sukhani, Seema

Titre : Integrated Wastewater Management for Tank Restoration in Urban Fringe Areas

Auteur : Sukhani, Seema

Université de soutenance : Indian Institute of Science BANGALORE

Grade : Doctor of Philosophy (PhD) 2021

Urban fringe water bodies are often seriously affected by urban wastewater including partially treated sewage entering it and degrading it. Sustainability requirements necessitate that such wastewaters are treated and recycled locally while also the affected waterbodies are restored bringing back not only water quality but also a higher level of aquatic and aqua-faunal diversity. In semi-arid regions of peninsular India, man-made surface water bodies, also called as Kere or tanks are severely affected by the above phenomenon. There are over a 100,000 such water bodies and many are likely to face this danger. Therefore, new understanding, sustainable water treatment processes and eco-restoration options need to be evolved and this study attempts this need. As many cities in Southern India increasingly urbanize, small villages, towns and cities grow to engulf nearby villages, the Village Tanks lose their importance as water sources accompanied by urban fringe wastewater flowing into them and resultant neglect, drying up or eutrophication. In the past most restoration efforts employed predominantly earth working to scoop out the silt /sludge. This situation prevails for decades until a complete sewerage and run-off networks are created. In this interregnum there is thus a need to restore waterbodies, which does not have any assured water source and thus needs treat locally flowing urban-fringe wastewater (UFWW) for which novel wastewater conditioning systems are to be developed. The proposed treatment /conditioning process needs to be preferably a passive one with little or no maintenance requirements. Therefore, to ensure adequate aquatic and lake-shore biodiversity, there is a need to tweak the UFW treatment systems to function passively, unattended for long periods and introduce adequate nutrition and primary components of the aquatic food chain and enable the food chain to establish in the water body. Towards this broader goal, a novel three-stage grid-independent...

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Page publiée le 24 janvier 2023