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The purpose of this research is to know the efficiency of irrigation networks and water loss Swamps the Mayo that occurred during the distribution of irrigation. Research methods used in this research is a research field that is by calculating the discharge of water channels, perkolasi, evaporation and seepage. The research results obtained average discharge early in the primary channel of 0.292 m3/s, the final discharge 0.25 m3/s, the loss of water, 0,042 m3/s and the efficiency of irrigation of 85,62%. On the secondary channel 1 average early discharge 0.268 m3/s discharge, 0.153 m3/s end, water loss of 0.115 m3/s and irrigation efficiency of 57,08%. On the secondary channel II early 0.22 m3/s debit, debit end 0.118 m3/s, water loss of 0.102 m3/s and irrigation efficiency of 53,63%. Irrigation efficiency at Mayo swamp irrigation is 46.39% where the value still meets the KP-01 (2013) Irrigation planning standard.

The primary cooling water system of a nuclear reactor contains Co-60 which requires treatments to avoid adverse effects on society and the environment. Experiment of Co-60 adsorption by using silica xerogel has been done. This experiment was intended to study the isothermal adsorption equilibrium and to determine thermodynamic parameters. Silica xerogel was made from rice husk ash using sol-gel method. The prepared of silica xerogel has a specific surface area of 142.034 m2/g. The adsorption experiments were carried out in a batch wise until it reaches an equilibrium state with variation of the initial concentration and temperature. The results show that Co (II) adsorption by silica xerogel following the Langmuir isotherm than Fruendlich model. Based on the experiment at three different temperatures, the maximum adsorption capacities depend on the temperature there are 25.71; 26.25; and 26.81 mg/g successively at a temperature of 30; 35; and 40 °C. The thermodynamic parameters showed that the cobalt-60 adsorption process by silica xerogel is spontaneous and endothermic with values of ΔH 117.084 kJ / mol and ΔS 35.582 kJ/K/mol. The use of the silica xerogel on the adsorption of reactor cooling water system containing Co-60 showed a decreasing of activity of the waste until 85% from the initial activity. These results indicate that the silica xerogel can be utilized as material to treat radioactive liquid waste containing Co-60.