Analysis of Greenhouse Gas Emissions in Centralized and Decentralized Water Reclamation with Resource Recovery Strategies in Leh Town, Ladakh, India, and Potential for Their Reduction in Context of the Water–Energy–Food Nexus
Abstract
:1. Introduction
1.1. Water Reclamation with Resource Recovery as Key Nexus Potential
1.2. GHG Emissions in India
- Study the current and planned wastewater management;
- Investigate and analyze different scenarios of possible water reclamation with resource recovery;
- Propose opportunities of improvement that can lead to energy, water, and GHG emission saving potential in the water and wastewater sector.
1.3. State-of-the-Art on GHG Emissions Estimation in the Wastewater Sector
1.3.1. Sources of CH4 Emissions
- Dissolved CH4 that is produced and transported from the collection system and that is then stripped a the WWTP headworks or in the aerobic reactors;
- Dissolved CH4 that is produced from anaerobic digestion and is left in the reject water that is recycled to the aerobic tanks, where a fraction of the dissolved CH4 is ultimately stripped;
- CH4 gas produced in anaerobic digestion that escapes via gas piping leaks;
- CH4 gas produced in anaerobic digestion that is not fully combusted in cogeneration [30] or thermally destructed by flaring;
- CH4 gas escaping from digested sludge storage facilities [29]; and
- Anaerobic lagoon treatment systems.
1.3.2. Sources of N2O Emissions
1.3.3. Other CO2, CH4, and N2O Emissions
1.4. Water Reclamation with Resource Recovery
1.4.1. Water
1.4.2. Energy
1.4.3. Nutrients
1.5. Decentralized Water Reclamation with Resource Recovery
1.5.1. Constructed Wetlands
- Several VSSF beds to remove organics and suspended solids and ensure nitrification; and
- Two or three HSSF beds to ensure denitrification and the further removal of organic and suspended solids. The pre-treatment step is necessary before the CW to avoid clogging, which is an obstruction of the free pore spaces due to the accumulation of solids. Conventional treatment settling time requires a retention time extended up to 4 h [61].
1.5.2. Fecal Sludge Management
2. Case Study Area Leh Town, Ladakh, and Basis for GHG Emission
- Lift the irrigation water from Indus river tributaries;
- Distribute drinking water to remote areas;
- Ensure heating and hot water for buildings.
2.1. Wastewater Management Situation in Leh
- Treated and disposed in situ;
- Stored temporarily and then emptied and transported to treatment off-site; or
- Transported through a sewer with wastewater and then treated off-site.
2.2. Scope of This Paper
2.3. GHG Emissions Assessment
2.3.1. GHG Emissions from Operation of the Water Reclamation with Resource Recovery Scenarios
2.3.2. GHG Emissions from Construction Works
- Assess the origin of their GHG emissions and their relative weight;
- Identify potential areas for improvement, regarding energy savings; and
- Forecast the reduction impact of future measures and monitor the results after their implementation.
2.4. GHG Reduction Potential
3. Results and Analysis
3.1. Water Supply Sector Emissions
3.2. Wastewater Sector Emissions
- Fully centralized scheme
- Combined decentralized and centralized scheme
- Combined household level and centralized scheme
3.2.1. Sludge Disposal
3.2.2. Biogas Potential and Usage
- between 1000 L/d and 2000 L/d in 11 pockets
- between 1000 L/d and 24,000 L/d in 7 pockets
- higher than 24,000 L/d in 4 pockets
3.2.3. Biogas Potential and Usage
3.2.4. GHG Emissions from Plant Construction
4. Discussion
4.1. Overcoming the Biogas Challenge
4.2. Limitations of the Study
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Lahmouri, M.; Drewes, J.E.; Gondhalekar, D. Analysis of Greenhouse Gas Emissions in Centralized and Decentralized Water Reclamation with Resource Recovery Strategies in Leh Town, Ladakh, India, and Potential for Their Reduction in Context of the Water–Energy–Food Nexus. Water 2019, 11, 906. https://doi.org/10.3390/w11050906
Lahmouri M, Drewes JE, Gondhalekar D. Analysis of Greenhouse Gas Emissions in Centralized and Decentralized Water Reclamation with Resource Recovery Strategies in Leh Town, Ladakh, India, and Potential for Their Reduction in Context of the Water–Energy–Food Nexus. Water. 2019; 11(5):906. https://doi.org/10.3390/w11050906
Chicago/Turabian StyleLahmouri, Mounia, Jörg E. Drewes, and Daphne Gondhalekar. 2019. "Analysis of Greenhouse Gas Emissions in Centralized and Decentralized Water Reclamation with Resource Recovery Strategies in Leh Town, Ladakh, India, and Potential for Their Reduction in Context of the Water–Energy–Food Nexus" Water 11, no. 5: 906. https://doi.org/10.3390/w11050906