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Quantitative microbial risk assessment is applied to four irrigation schemes using tertiary-treated effluent on leaf and root crops. Annual infection risk stays below the tolerable threshold for drip and subsurface application at every site, and exceeds it only for sprinkler application on leaf crops — which makes the irrigation method, rather than the treatment grade, the decisive control.
Ten years of piezometric and water-quality monitoring at a managed aquifer recharge scheme fed by tertiary-treated municipal effluent are reported. The water table recovered by 6.4 metres, nitrate concentrations in the receiving formation stayed below the drinking-water limit throughout, and residual pharmaceutical compounds attenuated within the first 120 metres of subsurface travel.
Twelve brackish-water reverse-osmosis units drawing on the same aquifer are compared over four years of operation. Silica scaling, rather than biofouling, governs the cleaning interval once recovery is pushed beyond 78 per cent, and an antiscalant dose schedule indexed to the measured saturation index extends run length by nineteen days on average.