Abstract
Drip irrigation systems are prone to changes in flow rate (FR) and increasing coefficients of variation (CV) when fed with treated wastewater, due to fouling inside the drippers. A model system was designed to measure the FR and fouling accumulation in laterals and drippers under different treatment conditions. A novel approach was taken to compare the different maintenance treatments. A comparison of chlorination and acidification strategies showed that daily chlorination and periodic acidification may prolong proper functioning of the drippers by maintaining a normal FR [(up to ±7 %) of nominal FR] and CV (<7 %) index in correlation with low fouling accumulation in the pipeline (<0.01 mg deposit/cm 2pipe ). Current recommendations for the frequency of conventional treatments were found to be insufficient. Chemical analyses of the fouling inside the dripper and accumulated on the pipe wall showed that biofilm can survive inside the dripper under harsh environmental conditions, even when the pipeline stays clean. These results shed light on biofilm growth and survival mechanisms inside the dripper and may pave the way to developing new treatments or improving dripper design.
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Acknowledgments
The authors gratefully acknowledge the financial support of the BMBF-Germany and the MOST-Israel: “On-line detection, treatment, and reduction of biofilm and chemical scaling in irrigation systems utilizing treated wastewater (TWW)” project and also wish to thank the Chief Scientist of the Israeli Ministry of Agriculture and Rural Development for the financial support of the project.
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Communicated by J. Li.
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Katz, S., Dosoretz, C., Chen, Y. et al. Fouling formation and chemical control in drip irrigation systems using treated wastewater. Irrig Sci 32, 459–469 (2014). https://doi.org/10.1007/s00271-014-0442-4
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DOI: https://doi.org/10.1007/s00271-014-0442-4