Application ID: APWRD23RA1051

 


Brief Details:

Dr. Rajhans Negi is a postdoctoral fellow in the Department of Environmental and Earth Sciences, Tel Aviv University, Israel. His research focuses on operation and sustainability assessment of water and wastewater utilities. Rajhans completed his bachelor degree in civil engineering from G.B Pant engineering college, Master degree with environmental engineering specialization from IIT Guwahati and PhD in environmental science and engineering from IIT Bombay. In his PhD thesis Rajhans performed environmental and economic assessment of wastewater recycling alternatives in urban water systems. His postdoctoral research at Tel Aviv University focuses on assessment and implementation of novel water treatment technology for micropollutants and emerging contaminants. Rajhans has authored multiple research papers on aerobic sludge biomass and assessment of wastewater treatment, including the estimation of baseline sustainability status of a typical Indian urban water system. He received multiple awards which includes merit scholarships during under graduation, best presentation awards in national and international conferences and Harry Bloomfield postdoctoral matching scholarship at Tel Aviv University. He is the associate member of the Institution of Engineers India and serves as reviewer in the journals of good repute.

Title of Talk:

Wastewater recycling is a prominent strategy to reduce water stress. It can conserve freshwater and limit the possible environmental interventions from disposal of treated/untread wastewater. However, enhancing the quality of wastewater to make it fit for reuse is resource intensive leading to energy consumption and greenhouse gas (GHG) emissions. My presentation will discuss my PhD work on determining the trade-offs between water saving potential, total embodied energy and GHG emissions from different wastewater recycling alternatives in a typical Indian urban water system. I will discuss the baseline sustainability status of the urban water system by estimating the total embodied energy (kWh/m3) and total GHG emissions (kgCO2eq/m3) using life cycle approach. Further, comparative assessment of the baseline with different wastewater recycling alternatives which includes, indirect potable reuse, direct potable reuse, non-potable reuse (centralized and decentralized) and hybrid reuse scenarios will be demonstrated. In addition to that, my brief research journey and future research and teaching plans will also be covered.

Teaching:

Raw water from rivers and reservoirs has inorganic matter like clay, silt and other organic impurities. It is vital to improve the quality of raw water and make it fit for potable purposes. Water treatment plants include various processes and amongst them, coagulation and flocculation are responsible for the removal of suspended and colloidal particles. The coagulation and flocculation are vital for efficient operation of water treatment plant as the suspended impurities may hinder filtration and disinfection processes resulting in inefficient water treatment. The teaching presentation will be aimed to introduce coagulation and flocculation process, its mechanisms, chemistry and factors influencing the efficiency of the process.

Google Scholar Link: 

https://scholar.google.com/citations?user=s4GPT0IAAAAJ&hl=en

 

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