Surface water processing installation with safety barrier
First Claim
1. A treatment plant for treating a surface water, the water displaying a high variability in quality, for making the surface water potable, said treatment plant comprising:
- a safety barrier mounted at an exit from the treatment plant and constituted by a physical filter providing, at the exit from said physical filter, a predetermined minimum quality regardless of any quality of the surface water on entry into said physical filter, the safety barrier including at least one nanofiltration membrane; and
a pre-treatment installation located upstream from said safety barrier and means for adjusting treatment intensity of said pretreatment installation so as to obtain a predetermined optimal quality of water having an organic content within a range of optimal values without totally eliminating the organic content of the water on entry into said safety barrier, as a function of an information element on current quality of water given by measuring means located at an entrance to said safety barrier.
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Accused Products
Abstract
A plant for the treatment of surface water comprises a safety barrier mounted at the exit from the treatment plant and constituted by a physical filter providing, at the exit from the filter, a predetermined minimum quality irrespectively of the quality of the water on entry into the filter, and a pre-treatment installation located upstream from the safety barrier, the treatment intensity of the pre-treatment installation being adjusted as a function of the characteristics of the surface water to be treated through measuring devices located at the entrance to the physical barrier. The safety barrier is advantageously a nanofiltration membrane, coupled if necessary to one or more reverse osmosis membranes mounted downstream in "series-rejection" mode. The disclosed installation can be applied to the treatment of water liable to show great variability in quality, notably to the treatment of surface water or of water with equivalent characteristics.
53 Citations
25 Claims
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1. A treatment plant for treating a surface water, the water displaying a high variability in quality, for making the surface water potable, said treatment plant comprising:
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a safety barrier mounted at an exit from the treatment plant and constituted by a physical filter providing, at the exit from said physical filter, a predetermined minimum quality regardless of any quality of the surface water on entry into said physical filter, the safety barrier including at least one nanofiltration membrane; and a pre-treatment installation located upstream from said safety barrier and means for adjusting treatment intensity of said pretreatment installation so as to obtain a predetermined optimal quality of water having an organic content within a range of optimal values without totally eliminating the organic content of the water on entry into said safety barrier, as a function of an information element on current quality of water given by measuring means located at an entrance to said safety barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for treating a surface water having an organic matter content to make the surface water potable by a treatment plant comprising the steps of:
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providing the treatment plant for treating the surface water, the water displaying a high variability in quality, said treatment plant comprising; a safety barrier mounted at an exit from the treatment plant and constituted by a physical filter providing, at the exit from said physical filter, a predetermined minimum quality regardless of any quality of the surface water on entry into said physical filter, the safety barrier including at least one nanofiltration membrane; and a pre-treatment installation located upstream from said safety barrier, treatment intensity of said pre-treatment installation being adjusted so as to obtain a predetermined optimal quality of water on entry into said safety barrier, as a function of an information element on current quality of water given by measuring means located at an entrance to said safety barrier, the pre-treatment installation comprising a clarification unit formed by a flocculation/settling/sand filtration sequence; pre-treating the surface water at the upstream from the safety barrier; and adjusting the safety barrier when the organic matter content in the surface water reaches the safety barrier so as to fix the organic matter content within a range of optimum values for eliminating microcontaminants. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method for treating a surface water against radioactive micropollution by a treatment plant as a protection barrier, comprising the steps of:
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providing the treatment plant for treating the surface water, the water displaying a high variability in quality, said treatment plant comprising; a safety barrier mounted at an exit from the treatment plant and constituted by a physical filter providing, at the exit from said physical filter, a predetermined minimum quality regardless of any quality of the surface water on entry into said physical filter, the safety barrier including at least one nanofiltration membrane; and a pre-treatment installation located upstream from said safety barrier, treatment intensity of said pre-treatment installation being adjusted so as to obtain a predetermined optimal quality of water on entry into said safety barrier, as a function of an information element on current quality of water given by measuring means located at an entrance to said safety barrier; pre-treating the surface water at the upstream from the safety barrier; and adjusting treatment intensity of the pre-treatment installation so as to obtain the predetermined optimal quality of water having an organic content within a range of optimal values without totally eliminating the organic content of the water the entry into the safety barrier.
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25. A method for treating a surface water against dissolved organic carbon by a treatment plant as a protection barrier, comprising the steps of:
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providing the treatment plant for treating the surface water, the water displaying a high variability in quality, said treatment plant comprising; a safety barrier mounted at an exit from the treatment plant and constituted by a physical filter providing, at the exit from said physical filter, a predetermined minimum quality regardless of any quality of the surface water on entry into said physical filter, the safety barrier including at least one nanofiltration membrane; and a pre-treatment installation located upstream from said safety barrier, treatment intensity of said pre-treatment installation being adjusted so as to obtain a predetermined optimal quality of water on entry into said safety barrier, as a function of an information element on current quality of water given by measuring means located at an entrance to said safety barrier; pre-treating the surface water at the upstream from the safety barrier; and adjusting treatment intensity of the pre-treatment installation so as to obtain the predetermined optimal quality of water having an organic content within a range of optimal values without totally eliminating the organic content of the water on the entry into the safety barrier.
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Specification