Plant protection products (PPPs) are measured in concentrations exceeding the water quality norms in surface waters of greenhouse areas. Governmental intention is to decrease these exceedings by obligation of the application of purification technology.
In this report, the results of experiments with new technologies and treatment configurations are described, as well as tests with known technologies at higher PPP concentrations.Application of H2O2 (inline and batch) showed fluctuating results (20-90%, averaged over the twelve PPPs of Standardised Water) and therefore does not seem ready for use in practice. A combination of H2O2, ozone and UV (inline) showed a removal efficacy of 98%, as well as batchwise treatment with ozone and UV. Multiple treatment of water with H2O2 and LDUV showed an efficacy of 87% after three UV treatments and 98% after eight.
Robustness tests with an increased concentration of PPPs showed an efficacy of 85% (factor 10) and 78% (factor 100) for inline treatment with H2O2 with low pressure UV, 82% and 65% for inline treatment of H2O2 and middle pressure UV, and 99% and 99% for short term inline treatment with ozone and activated carbon. The systems seem to be quite robust to changes in PPP-concentration.