Determining water quality requirements of coal seam gas produced water for sustainable irrigation
| Autor: | Jirka Šimůnek, Saeed Torkzaban, Dirk Mallants |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Soil management
Soil salinity Soil Science 010501 environmental sciences Coupled processes Other Agricultural and Veterinary Sciences 01 natural sciences Civil Engineering Water balance Salinity risk Water content 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology Environmental engineering Agronomy & Agriculture Agriculture 04 agricultural and veterinary sciences Produced water Leaching model Soil water Land and Farm Management 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Zero Hunger Major ion chemistry Water quality HYDRUS Agronomy and Crop Science Soil salinity control |
| Zdroj: | AGRICULTURAL WATER MANAGEMENT, vol 189, iss C Agricultural Water Management, vol 189, iss C Mallants, D; Simunek, J; & Torkzaban, S. (2017). Determining water quality requirements of coal seam gas produced water for sustainable irrigation. AGRICULTURAL WATER MANAGEMENT, 189, 52-69. doi: 10.1016/j.agwat.2017.04.011. UC Riverside: Retrieved from: http://www.escholarship.org/uc/item/7r1472pq |
| DOI: | 10.1016/j.agwat.2017.04.011. |
| Popis: | Coal seam gas production in Australia generates large volumes of produced water that is generally high in total dissolved solids and has a high sodium absorption ratio (SAR) which may affect soil structure, hydraulic conductivity, and crop production if used untreated for irrigation. By coupling major ion soil chemistry and unsaturated flow and plant water uptake, this study incorporates effects of salt concentrations on soil hydraulic properties and on root water uptake for soils irrigated with produced water featuring different water qualities. Simulations provided detailed results regarding chemical indicators of soil and plant health, i.e. SAR, EC and sodium concentrations. Results from a base scenario indicated that the use of untreated produced water for irrigation would cause SAR and EC values to significantly exceed the soil quality guide values in Australia and New Zealand (ANZECC). The simulations provided further useful insights in the type of coupled processes that might occur, and what the potential impacts could be on soil hydrology and crop growth. Calculations showed that the use of untreated produced water resulted in a decrease in soil hydraulic conductivity due to clay swelling causing water stagnation, additional plant-water stress and a reduction in plant transpiration. In case the produced water was mixed with surface water in a 1:3 ratio prior to irrigation, the calculated soil SAR values were much lower and generally acceptable for sandy to sandy-loam soil. The use of reverse osmosis treated produced water yielded an acceptable salinity profile not exceeding guide values for SAR and EC; the plant water stress was limited as there was no additional salinity stress associated with the low level of salts. Results further illustrated that accounting for coupled geochemical, hydrological and plant water uptake processes resulted in more accurate water balance calculations compared to an approach where such interactions were not implemented. Coupling unsaturated flow modelling with major ion chemistry solute transport using HYDRUS provides quantitative evidence to determine suitable water quality requirements for sustainable irrigation using coal seam gas produced water. |
| Databáze: | OpenAIRE |
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