The budget for this project can be estimated based on the scope of work and the materials required. The cost of the UV disinfection system, including the lamps, ballasts, and control modules, can range from $50,000 to $200,000. The cost of the sand filtration system, including the filter vessel, piping, and valves, can range from $100,000 to $500,000. The cost of labor, including installation, testing, and commissioning, can range from $200,000 to $1,000,000. Therefore, the total budget for this project can be estimated to be around $500,000 to $2,000,000.