Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-05-04
2000-07-25
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210616, 210621, 210631, 210903, C02F 330, C02F 158
Patent
active
060933216
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process which makes it possible simultaneously to ensure the removal of nitrogenous compounds, in particular nitrates, and the biological remineralization of water with a low mineral content before coagulation, flocculation and clarification treatments.
BACKGROUND OF THE INVENTION
It is known that the surface waters of solid masses of granite generally have a low mineral content. In addition, agriculture contributes towards increasing the nitrogenous pollution of surface waters. The result of this is that water treatment specialists are confronted with a twofold problem: system, and for water intended for human consumption.
Each of these problems can be solved separately using standard treatments: chemically, for example by adding lime and CO.sub.2 ; biological processes can be used.
The physicochemical processes do not remove the nitrates, they only move them: they are found in the regeneration eluates which also contain high concentrations of chlorides, or other regeneration salts; in addition, these processes are sensitive to the presence of organic materials in the water to be treated.
The biological processes are well suited to the removal of nitrogenous compounds; however, they do not allow colloidal substances to be removed. Moreover, these processes are dependent upon the temperature of the water to be treated and they have hitherto been used industrially only for the treatment of drilling waters having a constant temperature above 10.degree. C.
BRIEF DESCRIPTION OF THE INVENTION
Starting from this state of the art, the present invention intends to effect, under particularly economical conditions, a removal of nitrogenous compounds and at least partial remineralization of surface waters with a low mineral content before carrying out the standard coagulation, flocculation and clarification treatments.
The subject of the present invention is thus a process for removing nitrogenous compounds, in particular nitrates, and for remineralizing waters with a low mineral content, characterized in that the removal of the nitrogenous compounds and at least partial remineralization of the untreated water are carried out simultaneously by biological treatment, in the same reactor, the denitrified and remineralized water then being subjected to coagulation, flocculation and clarification treatments.
Still other objects and advantages of the present invention will become readily apparent by those skilled in the art from the following detailed description, wherein it is shown and described only the preferred embodiments of the invention, simply by way of illustration of the best mode contemplated of carrying out the invention. As will be realized, the invention is capable of other and different embodiments, and its several details are capable of modifications in various obvious respects, without departing from the invention. Accordingly, the drawing and description are to be regarded as illustrative in nature and not as restrictive.
BRIEF DESCRIPTION OF THE FIGURE
The FIGURE is a flowchart of the present method.
DETAILED DESCRIPTION OF THE INVENTION
According to the invention, the water to be treated, with a low mineral content, is placed in contact with a heterotrophic bacterial flora for the removal of the nitrogenous compounds, the heterotrophic biological denitrification reaction releasing carbon dioxide which is used directly and immediately to ensure at least partial biological remineralization of the water before the clarification is carried out.
An exemplary embodiment of the process which forms the subject of the invention will now be described with reference to the attached drawing. The single FIGURE in the drawing is a flowchart illustrating the various steps of this process.
The untreated water with a low mineral content, which is to be subjected to the simultaneous biological treatments for removal of the nitrogenous compounds and for remineralization, is supplemented with the necessary reagents for the growth and activity of the ba
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Patent Abstracts of Japan, vol. 011, No. 381 (C-464) Dec. 12, 1987, Patent: A 62152597.
Patent Abstracts of Japan, vol. 011, No. 381 (C-464) Dec. 12, 1987, Patent: A 62152593.
Bonnelye Veronique
Daniel Loic
Moles Jacques
Degremont
Wyse Thomas G.
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