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Leaching of N-Nitrosodimethylamine (NDMA) in Turfgrass Soils during Wastewater Irrigation

^a Department of Environmental Sciences
^b Agricultural Operations, University of California, Riverside, CA 92521
^c Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720

View larger version (24K): [in a new window]   Fig. 1. Daily maximum air temperature, minimum air temperature, and mean soil temperature at the 15-cm depth at the field site during the wastewater irrigation study.

View larger version (34K): [in a new window]   Fig. 2. Daily maximum, minimum, and mean relative humidity (RH) at the field site during the wastewater irrigation study.

View larger version (17K): [in a new window]   Fig. 3. Averaged daily irrigation rates of treated wastewater in turfgrass plots during the wastewater irrigation study.

View larger version (15K): [in a new window]   Fig. 4. Concentrations of N-nitrosodimethylamine (NDMA) in wastewater effluents used for irrigation during the wastewater irrigation study. Bars are mean of three replicates, lines are standard errors, and * indicates time when the tank was filled with a new batch of wastewater effluent.

View larger version (14K): [in a new window]   Fig. 5. Concentrations of N-nitrosodimethylamine (NDMA) in leachate water collected from the turfgrass plots irrigated with NDMA-containing wastewater during daytime.

View larger version (14K): [in a new window]   Fig. 6. Concentrations of N-nitrosodimethylamine (NDMA) in leachate water collected from the turfgrass plots irrigated with NDMA-containing wastewater during nighttime.