Your search found 6 records
1 Eguchi, S. 2011. Nitrogen accumulation in soil and ground water systems in Japan. Taipei, Taiwan: Food and Fertilizer Technology Center (FFTC). 12p. (FFTC Technical Bulletin 189)
Nitrogen ; Surface water ; Groundwater pollution ; Water quality ; Soil quality ; Monitoring ; Denitrification ; Fertilizers ; Arable land ; Soils ; Environmental effects / Japan
(Location: IWMI HQ Call no: P 8153 Record No: H046702)
http://www.agnet.org/library.php?func=view&id=20131122101037
https://vlibrary.iwmi.org/pdf/H046702.pdf
https://vlibrary.iwmi.org/pdf/H046702.pdf
(1.17 MB)
2 Gunawardena, J.; Muthuwatta, Lal; Fernando, M. J. J.; Rathnayake, S.; Rodrigo, T. M. A. S. K.; Gunawardena, A. (Eds.) 2015. Proceedings of the First International Symposium on Environment Management and Planning, Battaramulla, Sri Lanka, 23-24 February 2015. Colombo, Sri Lanka: Central Environmental Authority (CEA). 55p.
Environmental management ; Forest plantations ; Drug plants ; Tea ; Rubber industry ; Agroforestry ; Biodiversity ; Wildlife ; Freshwater ; Water quality ; Groundwater pollution ; Water deficit ; Land use ; Paddy fields ; Constructed wetlands ; Carbon ; Meteorology ; Models ; Satellite surveys ; GIS ; Remote sensing ; Maps ; Soil salinity ; Erosion ; Sand ; Solar radiation ; Watersheds ; Aquifers ; River basins ; Tanks ; Energy generation ; Bioremediation ; Waste management ; Performance evaluation ; Toxic substances ; Pollutant load ; Noise pollution ; Denitrification ; Leachates ; Biofertilizers ; Aquatic insects ; Food production ; Fishing ; Farmers ; Vegetable growing ; Vermicomposting ; Health hazards ; Malaria ; Case studies ; Arid zones ; Coastal area ; Coral reefs / Sri Lanka / India / Tangalle / Vavuniya / Jaffna / Killinochchi / Mullaitivu / Mannar / Kalpitiya / Colombo / Kalutara / Matara / Weligama / Badulla / Upper Mahaweli Catchment / Paraviwella Reef / Vairavapuliyankulam Tank / Kelani River / Himalayan Region
(Location: IWMI HQ Call no: IWMI Record No: H046899)
(1.32 MB)
3 Arceivala, S. J.; Asolekar, S. R. 2007. Wastewater treatment for pollution control and reuse. 3rd ed. New Delhi, India: McGraw-Hill Education. 518p.
Wastewater Management ; Waste water treatment plants ; Pollution control ; Ecosystem approaches ; Waste disposal ; Environmental impact assessment ; Urban wastes ; Solid wastes ; Slums ; Sewerage ; Sanitation ; Mechanical methods ; Aerobic treatment ; Bioreactors ; Biological treatment of pollutants ; Sludge treatment ; Anaerobic treatment ; Physicochemical treatment ; Membrane processes ; Aerated lagoons ; Stabilization ponds ; Fish ponds ; Hyacinthus ; Duckweed ; Constructed wetlands ; Vermiculture ; Algal growth ; Oxygen requirement ; Phosphorus removal ; Nitrification ; Denitrification ; Wastewater irrigation ; Irrigation systems ; Soil properties ; Agriculture ; Water reuse ; Industrial uses ; Water conservation ; Groundwater recharge ; Water supply ; Public distribution system ; Resource recovery ; Sustainability ; Planning ; Guidelines / India
(Location: IWMI HQ Call no: 628.3 G000 ARC Record No: H047990)
(0.67 MB)
4 McGill, B. M.; Altchenko, Yvan; Hamilton, S. K.; Kenabatho, P. K.; Sylvester, S. R.; Villholth, Karen G. 2019. Complex interactions between climate change, sanitation, and groundwater quality: a case study from Ramotswa, Botswana. Hydrogeology Journal, 27(3):997-1015. [doi: https://doi.org/10.1007/s10040-018-1901-4]
Climate change ; Sanitation ; Groundwater management ; Water quality ; Water supply ; Water security ; Drinking water ; Monitoring ; Wastewater treatment ; Water pollution ; Ecological factors ; Environmental factors ; Environmental protection ; Nitrates ; Denitrification ; Contamination ; Aquifers ; Rainfall ; Drought ; Pit latrines ; Faecal coliforms ; Caffeine ; Human wastes ; Case studies / Africa South of Sahara / Botswana / Ramotswa
(Location: IWMI HQ Call no: e-copy only Record No: H049051)
https://link.springer.com/content/pdf/10.1007%2Fs10040-018-1901-4.pdf
https://vlibrary.iwmi.org/pdf/H049051.pdf
https://vlibrary.iwmi.org/pdf/H049051.pdf
(1.98 MB)
Groundwater quantity and quality may be affected by climate change through intricate direct and indirect mechanisms. At the same time, population growth and rapid urbanization have made groundwater an increasingly important source of water for multiple uses around the world, including southern Africa. The present study investigates the coupled human and natural system (CHANS) linking climate, sanitation, and groundwater quality in Ramotswa, a rapidly growing peri-urban area in the semi-arid southeastern Botswana, which relies on the transboundary Ramotswa aquifer for water supply. Analysis of long-term rainfall records indicated that droughts like the one in 2013–2016 are increasing in likelihood in the area due to climate change. Key informant interviews showed that due to the drought, people increasingly used pit latrines rather than flush toilets. Nitrate, fecal coliforms, and caffeine analyses of Ramotswa groundwater revealed that human waste leaching from pit latrines is the likely source of nitrate pollution. The results in conjunction indicate critical indirect linkages between climate change, sanitation, groundwater quality, and water security in the area. Improved sanitation, groundwater protection and remediation, and local water treatment would enhance reliable access to water, de-couple the community from reliance on surface water and associated water shortage risks, and help prevent transboundary tension over the shared aquifer.
5 Hester, E. T.; Eastes, L. A.; Widdowson, M. A. 2019. Effect of surface water stage fluctuation on mixing-dependent hyporheic denitrification in riverbed dunes. Water Resources Research, 55(6):4668-4687. [doi: https://doi.org/10.1029/2018WR024198]
Rivers ; Dunes ; Surface water ; Hydraulics ; Denitrification ; Groundwater flow ; Stream flow ; Sediment ; Nitrates ; Oxygen ; Models ; Environmental effects
(Location: IWMI HQ Call no: e-copy only Record No: H049256)
(3.49 MB)
The hyporheic zone, where surface water (SW) and groundwater (GW) interact in shallow sediments beneath rivers, is uniquely reactive and attenuates pollutants. Mixing of reactants from SW and GW enables mixing-dependent (MD) reactions, which may be the last opportunity for GW contaminants to react before entering SW. Yet little is known about hyporheic MD reactions, particularly how they respond to daily or seasonal SW fluctuations or sediment heterogeneity. We used MODFLOW and SEAM3D to simulate non-mixing-dependent (NMD) aerobic respiration and MD denitrification in a riverbed dune with nitrate from SW and dissolved organic carbon from GW. We varied SW heads and heterogeneity of sediment hydraulic conductivity. For longer-term fluctuations (i.e., seasons), increasing SW depth from 0.1 to 1.0 m increased NMD aerobic respiration by 270% and MD denitrification by 78% in homogeneous sediment. MD reactions thus were controlled by mixing zone length or size and would be stronger when SW stage is elevated, for example, during wintertime. Adding sediment heterogeneity to the long-term scenarios, particularly by increasing hydraulic conductivity correlation length, increased flow focusing and consequently increased MD denitrification by 20–30%. By contrast, the net effect of daily SW fluctuations on MD denitrification in homogeneous sediment was minor. In sum, SW fluctuations are an important control on hyporheic MD reactions, primarily by controlling mixing zone length. The hyporheic zone may attenuate nitrate in upwelling GW plumes, but temporal fluctuations may be considerable as quantified above.
6 Nilsson, J. E.; Weisner, S. E. B.; Liess, A. 2023. Wetland nitrogen removal from agricultural runoff in a changing climate. Science of The Total Environment, 892:164336. (Online first) [doi: https://doi.org/10.1016/j.scitotenv.2023.164336]
Agricultural runoff ; Nitrogen retention ; Constructed wetlands ; Changing climate ; Eutrophication ; Denitrification ; Drought ; Vegetation ; Organic matter ; Precipitation / Sweden
(Location: IWMI HQ Call no: e-copy only Record No: H051993)
https://www.sciencedirect.com/science/article/pii/S0048969723029571/pdfft?md5=8b605451b679bf02fb88be90f871c782&pid=1-s2.0-S0048969723029571-main.pdf
https://vlibrary.iwmi.org/pdf/H051993.pdf
https://vlibrary.iwmi.org/pdf/H051993.pdf
(1.99 MB) (1.99 MB)
Wetlands in agricultural areas mitigate eutrophication by intercepting nutrient transports from land to sea. The role of wetlands for nutrient removal may become even more important in the future because of the expected increase in agricultural runoff due to climate change. Because denitrification is temperature dependent, wetland nitrogen (N) removal usually peaks during the warm summer. However, climate change scenarios for the northern temperate zone predict decreased summer and increased winter flows. Future wetlands may therefore shift towards lower hydraulic loading rate and N load during summer. We hypothesised that low summer N loads would decrease annual wetland N removal and tested this by examining 1.5–3 years of continuous N removal data from created agricultural wetlands in two regions in southern Sweden (East and West) during different periods. West wetlands showed relatively stable hydraulic loads throughout the year, whereas East wetlands had pronounced no-flow periods during summer. We compared East and West wetlands and tested the effects of several variables (e.g., N concentration, N load, hydraulic load, depth, vegetation cover, hydraulic shape) on annual absolute and relative N removal. We found no difference in annual N removal between East and West wetlands, even though summer N loads were lower in East than in West wetlands. A possible explanation is that stagnant water conditions in East wetlands suppressed decomposition of organic matter during summer, making more organic matter available for denitrification during winter. Absolute N removal in all wetlands was best explained by N load and hydraulic shape, whereas relative N removal was best explained by emergent vegetation cover and hydraulic shape. This study highlights the importance of design and location of agricultural wetlands for high N removal, and we conclude that wetlands in a future climate may remove N from agricultural runoff as efficiently as today.
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