Superabsorbents (SAP) are loosely crosslinked hydrophilic polymers can absorb a large amounth of water. In a soil it works as moistre bufor limiting plant water stres. It has been observed mixing SAP with soil decrease its strength parameters. To prevent that phenomena a kind of geocomposite absorbing water was introduced. It is a flat tube made from geotextile, filled with superabsorbent. Application of the geocomposite limits a problem of water avability for plant, which increase slopes erosion resistance. ...
Factors determining water erosion of slopes and standard anti erosion methods were presented. The analyze of erosion control methods applied in North America induced authors to present methods of soil intercepting in favorable sites on the slope. Methods of erosion limiting in a small watershed based on temporary and permanent barriers, sedimentation basins, ponds and small reservoirs were described. Construction of temporary barriers, basins with permeable divisions, ponds and reservoirs with tower and emergency outlet were presented. ...
This study presents the analysis of basic properties of selected superabsor-bents. The main objective was to determine the real absorption level, which is cru-cial for the accurate selection of such dosage of superabsorbent that would result in expected increase in crops and would be cost efficient at the same time. The in-fluence of grain size distribution, type of superabsorbent, temperature and the presence of ions in the water on the volume of absorption and the course of the absorption processwere determined,. in order to supplement the information pro-vided by manufacturers and authors of scientific publications. Due to the wide range of applications of superabsorbents there are no accurate data on their properties for specific applications. For the analyzed Aquasorb superabsorbents (3005 KS, KM and KL) the best absorption results were achieved for medium grain sizes, not for small grain sizes as stated by the manufacturer, due to the formation of clumps that prevented small particles to heave quickly - some of the particles trapped inside such clumps could participate in the absorption process only to a limited extent. The tests conducted in demineralized water with superabsorbents of a similar grain size distribution but different chemical composition - Aquaterra and Aquasorb ...
The study presents the results of tests on the bottom sediments of the Do-bromierz Reservoir. The reservoir was put into operation in 1986; it is used as flood reservoir and drinkable water reservoir. It is located in the northern part of the catchment of Strzegomka river.In the bottom sediment samples the following substances were determined: nitrates, nitrites, ammonium nitrogen, organic nitrogen, phosphates, and phos-phorus. The authors also conducted microbiological analyses of the collected se-diments. Cultures of nitrifying and denitrifying bacteria were started. The sediments were analyzed with use of electron microscope. A series of photographs documenting the composition of the sediments were taken. The test results enable us to claim that the grain size distribution of the se-diments is equivalent to that of silty loam and silty clay loam. The mineralogical composition is dominated by silicates and aluminosilicates - bottom sediments of the Dobromierz reservoir can be classified to the silicate category. The process of denitrification takes place in the sediments. Significantly higher content of phos-phates was found in the bottom sediment than in the benthic waters. The difference in the content in benthic waters and in the sediments causes internal phosphorus loading. During the analyzed period, this process did ...
Analysis of tests on soils with randomly distributed fibre reinforcement an possibilities of its application in geotechnical and environmental engineering were presented in the paper. Using this type of reinforcement make it is possible to form flexible earth structures with green surfaces and relatively high resistance on different settlement substituting heavy, rigid and strange in the landscape concrete structures. By mixing synthetic fibers, both specially produced as reinforcement or other ones eg. recovered from waste carpets or foils, with soil and sometimes very small amount of cement, shear strength resistance and its residual value increase is achieved. Reinforcement dose not disturb growth of plants or water infiltration, so the fiber-soil composite is an environmental friendly solution. Higher strength is positively influencing other soil parameters like piping resistance or resistance against erosion, but in this field of application there is much less investigation data. ...
