MXPA98001545A - Procedure for the elimination of nitrogenated compounds and for the remineralization of weak water mineraliz - Google Patents
Procedure for the elimination of nitrogenated compounds and for the remineralization of weak water mineralizInfo
- Publication number
- MXPA98001545A MXPA98001545A MXPA/A/1998/001545A MX9801545A MXPA98001545A MX PA98001545 A MXPA98001545 A MX PA98001545A MX 9801545 A MX9801545 A MX 9801545A MX PA98001545 A MXPA98001545 A MX PA98001545A
- Authority
- MX
- Mexico
- Prior art keywords
- water
- remineralization
- biological
- elimination
- process according
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000000395 remineralization Effects 0.000 title claims abstract description 26
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 18
- 150000001875 compounds Chemical class 0.000 title claims description 3
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005352 clarification Methods 0.000 claims abstract description 9
- 238000005345 coagulation Methods 0.000 claims abstract description 8
- 230000015271 coagulation Effects 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 7
- 150000002823 nitrates Chemical class 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000003153 chemical reaction reagent Substances 0.000 claims description 9
- 230000000102 heterotrophic Effects 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 239000003643 water by type Substances 0.000 claims description 4
- 230000001580 bacterial Effects 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H Aluminium sulfate Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K Iron(III) chloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000001112 coagulant Effects 0.000 claims description 2
- 239000000701 coagulant Substances 0.000 claims description 2
- 239000000084 colloidal system Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 230000035511 metabolization Effects 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 230000002194 synthesizing Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 239000000654 additive Substances 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 239000010452 phosphate Substances 0.000 claims 1
- 150000002830 nitrogen compounds Chemical class 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 238000011109 contamination Methods 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- 238000005188 flotation Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000015450 Tilia cordata Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- -1 nitrates Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Abstract
The present invention relates to a process for removing nitrogenous compounds, in particular nitrates, and for remineralizing water with a low content of minerals, characterized in that the elimination of nitrogen compounds and at least a partial remineralization of untreated water are carried out simultaneously by biological treatment, in the same reactor. The denitrified and remineralized water is subjected to coagulation, flocculation and clarification treatments.
Description
PROCEDURE FOR THE ELIMINATION OF NITROGENATED COMPOUNDS AND FOR REMINERALIZATION OF WEAK MINERALIZED WATER
DESCRIPTION OF THE INVENTION The present invention relates to a process that allows to simultaneously ensure the elimination of nitrogen compounds, particularly nitrates, and the biological remineralization of weakly mineralized waters before the coagulation, flocculation and clarification treatments. It is known that surface waters of granite massifs are generally poorly mineralized. In addition, in an agricultural context, there is an increase in nitrogenous contamination in surface waters. This results in water treatment specialists being confronted with a double problem: - remineralizing the water before it is distributed to drinking water networks, and - eliminating nitrogenous contamination, in order to meet the quality standards of water intended for human consumption. Each one is these problems can find a solution separately, applying classical treatments: - as far as the remineralization of water is concerned, it can be carried out chemically, for example making additions of lime and C02; - as regards the elimination of nitrogenous contamination, physical-chemical or biological procedures can be applied. Physical-chemical processes do not eliminate nitrates; they do no more than displace them: they are found in regeneration eluates, which also contain high concentrations of chlorides, or other regeneration salts; In addition, these procedures are sensitive to the presence of organic materials in the water to be treated. The biological procedures are well adapted for the elimination of the nitrogen compounds, however, they do not allow to eliminate the colloidal substances. On the other hand, these procedures are tributary to the temperature of the water to be treated, and up to the present, they have not been applied in an industrial manner other than for the treatment of drilling waters that have a constant temperature and higher than 10 ° C. of this state of the art, the present invention is proposed to perform under particularly economical conditions, a removal of nitrogen compounds, and at least partial remineralization of the weakly mineralized surface waters, before carrying out the classical treatments of coagulation, flocculation and clarification. The subject of the present invention is therefore a process for removing nitrogenous compounds, particularly nitrates, and for remineralization of weakly mineralized waters, characterized in that the elimination of nitrogen compounds and remineralization is carried out simultaneously by biological treatment in the same reactor. At least partial of the untreated water, the denitrified and remineralized water is then subjected to coagulation, flocculation and clarification treatments. According to the invention, the water to be treated, weakly mineralized, is put in contact with a heterotrophic bacterial flora, for the elimination of nitrogen compounds, the heterotrophic biological reaction of denitrification releases carbon dioxide, which is used directly and immediately to ensure remineralization biological, at least partial, water before clarification. An example of application of the process object of the invention will now be described, with reference to the appended drawing. The single figure of the drawing is a diagram that illustrates the different stages of this procedure. The untreated, weakly mineralized water, before being submitted to the simultaneous biological treatments for the elimination of nitrogen compounds and remineralization, is added with the reagents necessary for the growth and activity of the bacteria, that is, a source of carbon assimilable by heterotrophic bacteria, particularly ethanol, acetic acid and phosphorous reagents such as particularly phosphoric acid. The untreated water is then introduced into a single reactor, where the elimination of the nitrogenous compounds, particularly nitrates, and the at least partial remineralization of the untreated water are carried out simultaneously via the biological route. In the reaction zone, the water to be treated, weakly mineralized, is put in contact with a heterotrophic bacterial flora, which ensures the elimination of the nitrogenous compounds, and the heterotrophic denitrification biological reaction releases carbon dioxide directly usable to participate in the reaction of remineralization, before the coagulation-flocculation stage. Thus, according to the invention, the elimination of the nitrogenous compounds by heterologous biological path is accompanied by a biological remineralization of the weakly mineralized untreated water, in the same reaction zone. The contact time in the biological zone is that necessary for the metabolization reaction of the nitrogen compounds and for biological remineralization. This contact time is also a function of the temperature of the medium. By way of example, it can be stated that at 12 ° C, this contact time is approximately 7 minutes for an elimination of N03 ~ of 50 mg / liter. In addition, during the application of this procedure, the heterotrophic denitrifying bacteria, associated with the suspended materials of the untreated water, form a flake that has the property of being very unobstructed in a fixed culture reactor on a support material of a certain granulometry. , and of being able to be fluidized in a reactor in free culture. According to the invention, the water to be treated is introduced into the base of the single biological reactor, and the biological contact zone can be either filled with a granular material that allows the fixation of the bacteria to its surface, either empty, allowing , from a support generating flakes, constitute a bed of sediment, composed of dense flakes, fluidized by the upward flow of water in the course of treatment. In these two modes of application, the introduction of the water to be treated to the base of the reactor allows the evacuation of all or part of the flakes generated by the biological reaction in the presence of suspended materials and colloids of the water to be treated. The particular character of the codend formed in the biological reactor gives the sediment a coefficient of cohesion superior to that obtained with untreated water alone, which allows a better separation to be carried out afterwards, either by decanting or by flotation. After the stage of elimination of the nitrogenous compounds and biological remineralization of the water, a aeration of the remineralized and denitrified water is carried out, and then the coagulation-flocculation and clarification stages of the effluent. The coagulation-flocculation stage takes place in a more buffered medium, since the bicarbonate ions formed during biological denitrification ensure remineralization of the untreated water. Thus, this medium is more stable in terms of pH, and the control of optimal coagulation conditions is easier, which allows, for example, to reduce the residual concentration in Al3 + ions. Before carrying out the coagulation-flocculation treatment, the water treated in the biological reactor is added with the reagents necessary for coagulation-flocculation. She receives a coagulant, usually ferric chloride, aluminum sulfate or any other derivative, an acid or alkaline reagent that allows to obtain the optimum coagulation Ph, usually C02, sulfuric acid, soda or whitewash. It is also possible to use a flocculation aid, for example an anionic polymer of synthesis or of organic origin.
The denitrified, remineralized, coagulated and flocculated water in this manner is then clarified by a conventional procedure, for example by decanting or flotation.
The process according to the present invention can very easily be integrated into an existing clarification process, which comprises as a clarification reactor, a float or a sediment bed settler. The process according to the present invention allows significant savings in remineralization reagents. Thus, on the basis of a decrease of 70 ppm of nitrates, and on a station of 500 mVho, the economy realized by the invention, in relation to the quantities of C02 injected in the application of the classical procedures of remineralization of water, is of 250 tons per year, which represents in the current economic conditions, an economy of 450,000 to 500,000 Francs per year. It is well understood that the present invention is not limited to the application examples described and mentioned above, but includes all variants.
It is noted that in relation to this date, the best procedure known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.
Having described the invention as above, property is claimed as contained in the following:
Claims (9)
- CLAIMS 1. Procedure for the elimination of nitrogenous compounds, particularly nitrates, and for the remineralization of weakly mineralized waters, characterized in that the elimination of nitrogenous compounds and at least partial remineralization are carried out simultaneously by biological treatment in a same reactor. of untreated water, and the denitrified and remineralized water is then subjected to coagulation, flocculation and clarification treatments.
- 2. Process according to claim 1, characterized in that the water to be treated, weakly mineralized, is put in contact with a heterotrophic bacterial flora for the elimination of the nitrogenous compounds, the heterotrophic biological reaction of denitrification releases carbon dioxide, which is used directly for ensure the biological remineralization, at least partial, of the water before clarifying.
- 3. Process according to claim 2, characterized in that the biological remineralization is carried out in the same reaction zone as the biological elimination of the nitrogen-containing compounds.
- 4. Process according to any of the preceding claims, characterized in that the biological reaction zone is filled with a granular material that allows the fixation of the heterotrophic bacteria to its surface, and the water to be treated is introduced to the base of the zone, to To ensure the evacuation of all or part of the flakes generated by the biological reaction in the presence of the suspended materials and colloids of the water to be treated.
- 5. Process according to any of claims 1 to 3, characterized in that the biological reaction zone is empty, and the water to be treated is introduced to the base of the zone, in order to allow, from a support generating flakes, constitute a bed of sediment composed of dense flakes fluidized by the upward flow of water in the course of treatment.
- 6. Process according to any of the preceding claims, characterized in that the contact time of the water to be treated in the biological reaction zone is a function of the temperature of the medium, and is selected so as to ensure the metabolization reaction of the compounds nitrogen and the biological remineralization of untreated water.
- 7. Process according to claim 3, characterized in that the additives added to the water to be treated, for the purpose of growth and activity of the bacteria, are selected from the sources of carbon assimilable by the bacteria, particularly: ethanol, acetic acid, and phosphate reagents such as particularly phosphoric acid.
- 8. Method according to any of the preceding claims, characterized in that, after the denitrification and remineralization treatment, the water is added with the reagents necessary for the coagulation-flocculation, particularly a coagulant such as ferric chloride, aluminum sulfate and eventually In addition, an acid or alkaline reagent to correct the pH of the coagulation, this reagent can be C02, sulfuric acid, soda or whitewash.
- 9. Process according to claim 8, characterized in that a flocculation aid is added such as an anionic polymer of synthesis or of organic origin.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR95/10179 | 1995-08-29 | ||
| FR9510179 | 1995-08-29 | ||
| FR9510179A FR2738234B1 (en) | 1995-08-29 | 1995-08-29 | PROCESS FOR REMOVAL OF NITROGEN COMPOUNDS AND REMINERALIZATION OF LOWLY MINERALIZED WATER |
| PCT/FR1996/001303 WO1997008105A1 (en) | 1995-08-29 | 1996-08-21 | Method for removing nitrogen compounds and for remineralizing weakly mineralized water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9801545A MX9801545A (en) | 1998-05-31 |
| MXPA98001545A true MXPA98001545A (en) | 1998-10-23 |
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