Currently, agriculture in many countries including the Czech Republic is increasingly facing the problem of drought. The lack of precipitation results in a reduced harvest, which implies added irrigation and freshwater requirements. One of the ways to overcome the scarcity of fresh water is to search for alternative sources of irrigation water. The paper deals with a water source, which has not been preferred yet, but theoretically provides a wide application - treated municipal wastewater. Under a pilot plant, several selected soils were tested, placed in 2.0 m high filtration columns. Our observation was focused on ammonia nitrogen and its gradual decline during the flow through the soil profile. Samples from the filtration columns (inflow = irrigation; outflow = drainage water) were periodically taken, while the collected data were used for calibration of the numerical model. The model was calibrated in two successive separate steps, both were compiled in HYDRUS-2D. In the first step the model was calibrated according to the measured soil water content of materials. Subsequently, a second calibration was performed using the measured seepage concentrations of ammonia. Despite certain simplifications caused by the focus only on ammonia nitrogen, the model shows very favourable results. The hydraulic model’s goodness of fit (between observed vs. measured values of water content) is R2 = 0.88 for sand, 0.76 for loam, 0.72 for sandy-loam with vegetation on surface and 0.74 for sandy-loam without vegetation. The calibrated hydraulic model for solute transport (between observed vs. measured values of NH4+-N concentration) showed the value of R2 = 0.89 for sand, 0.95 for loam, 0.95 for sandy-loam with vegetation on surface and 0.92 for sandy-loam without vegetation. The model provides significant information on the dependence of decrease of ammonia pollution by the depth. Inflow concentration of ammonia on surface 17 ± 1 mg/l is reduced to the value of 2.0 mg/l at a depth of 110 cm. It is crucial for real application to maintain the hydraulic criteria - the field capacity should not be exceeded in praxis. The value of field capacity was deliberately slightly exceeded because of understanding of the situation: how the pollution proceeds below if this rule is not followed. As a result, if wastewater is applied, the groundwater level should not be at a depth of less than 1.5 m.
Alcalde Sanz L., Gawlik B. (2014): Water Reuse in Europe – Relevant Guidelines, Needs for and Barriers to Innovation. EUR – Scientific and Technical Research Series. Available at http://publications.jrc.ec.europa.eu/repository/handle/JRC92582
Blumenthal U.J., Peasey A. (2002): Critical Review of Epidemiological Evidence of the Health Effects of Wastewater and Excreta Use in Agriculture. London School of Hygiene and Tropical Medicine, London. Available at http://www.who.int/water_sanitation_health/wastewater/whocriticalrev.pdf
Dudley Lynn M., Ben-Gal Alon, Lazarovitch Naftali (2008): Drainage Water Reuse: Biological, Physical, and Technological Considerations for System Management. Journal of Environment Quality, 37, S-25- https://doi.org/10.2134/jeq2007.0314
EEA (2012): Towards Efficient Use of Water Resources in Europe. EEA Report No. 1/2012. Copenhagen, European Environment Agency.
Levy Guy J., Fine Pinchas, Goldstein Dina, Azenkot Asher, Zilberman Avraham, Chazan Amram, Grinhut Tzfrir (2014): Long term irrigation with treated wastewater (TWW) and soil sodification. Biosystems Engineering, 128, 4-10 https://doi.org/10.1016/j.biosystemseng.2014.05.004
Li Yong, Šimůnek Jirka, Zhang Zhentin, Jing Longfei, Ni Lixiao (2015): Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D. Agricultural Water Management, 148, 213-222 https://doi.org/10.1016/j.agwat.2014.10.010
Marković M., Filipović V., Legović T., Josipović M., Tadić V. (2016): Evaluation of different soil water potential by field capacity threshold in combination with a triggered irrigation module. Soil and Water Research, 10, 164-171 https://doi.org/10.17221/189/2014-SWR
Nakasone Hideo, Abbas Muhammad Akhtar, Kuroda Hisao (2004): Nitrogen transport and transformation in packed soil columns from paddy fields. Paddy and Water Environment, 2, 115-124 https://doi.org/10.1007/s10333-004-0050-7
Navarro I., Chavez A., Barrios J.A., Maya C., Becerril E., Lucario S., Jimenez B. (2015): Wastewater reuse for irrigation — practices, safe reuse and perspectives. In: Javaid M.S. (ed.): Irrigation and Drainage – Sustainable Strategies and Systems. InTech. Available at http://www.intechopen.com/books/irrigation-and-drainage-sustainable-strategies-and-systems/wastewater-reuse-for-irrigation-practices-safe-reuse-and-perspectives
Šimůnek Jirí, van Genuchten Martinus Th., Šejna Miroslav (2008): Development and Applications of the HYDRUS and STANMOD Software Packages and Related Codes. Vadose Zone Journal, 7, 587- https://doi.org/10.2136/vzj2007.0077
Šimůnek J., van Genuchten M.Th., Šejna M. (2012): The HYDRUS Software Package for Simulating Two- and Three-dimensional Movement of Water, Heat, and Multiple Solutes in Variably-saturated Porous Media. Technical Manual, Version 2.0. Prague, PC Progress.
Šimůnek Jiří, van Genuchten Martinus Th., Šejna Miroslav (2016): Recent Developments and Applications of the HYDRUS Computer Software Packages. Vadose Zone Journal, 15, 0- https://doi.org/10.2136/vzj2016.04.0033
WHO (2006): Guidelines for the Safe Use of Wastewater, Excreta and Greywater. Geneva, World Health Organization. Available at http://www.who.int/water_sanitation_health/publications/gsuweg2/en/
WMO (2017): WMO Statement on the State of the Global Climate in 2016. Geneva, World Meteorological Organization. Available at https://library.wmo.int/opac/doc_num.php?explnum_id=3414
Amha Yamrot M., Kumaraswamy Rajkumari, Ahmad Farrukh (2015): A probabilistic QMRA of Salmonella
in direct agricultural reuse of treated municipal wastewater. Water Science & Technology, 71, 1203- https://doi.org/10.2166/wst.2015.093
Zavadil J. (2009): The effect of municipal wastewater irrigation on the yield and quality of vegetables and crops. Soil and Water Research, 4, 91-103 https://doi.org/10.17221/40/2008-SWR