CN103058410B - Water filtering method - Google Patents
Water filtering method Download PDFInfo
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- CN103058410B CN103058410B CN201210560390.9A CN201210560390A CN103058410B CN 103058410 B CN103058410 B CN 103058410B CN 201210560390 A CN201210560390 A CN 201210560390A CN 103058410 B CN103058410 B CN 103058410B
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- ferrous salt
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Abstract
The invention discloses a water filtering method. The method includes the following steps: adding potassium permanganate and ferrite into raw water, evenly mixing to enable potassium permanganate and ferrite to be subjected to a flocculation reaction to form floccules, and then filtering the water solution. According to the method, ferrous iron is oxidized by potassium permanganate, under the action of organic matters and the efficient flocculation of ferric iron formed in situ, the concentration of pollutants in the water can be reduced, the flocculation effect can be improved, the size of initial particles forming the floccules is enlarged, the degree of density and the thickness of a cake layer on the surface of a membrane are reduced, and thus the purposes of controlling membrane fouling and water filtering are achieved.
Description
Technical field
The invention belongs to membrane filtration water purification field in water treatment, be specifically related to a kind of method of filtered water.
Background technology
In feedwater and wastewater treatment, the problem that hinders film application is mainly that film pollutes.Chemical coagulation, as a kind of pretreatment process, can pollute and produce certain impact the film of MF/UF system.FeCl
3carry out pre-treatment as coagulating agent, there is obvious effect to delaying film pollution, and can remove preferably natural organic matter.Flco after coagulation is remaining neutral hydrophobic nature small-molecule substance in planar water effectively, improves membrane flux and then alleviates film and pollute.
So far, also in water treatment, not forming Fe (III) about pre-treatment situ before film pollutes controlling diaphragm and removes organic report simultaneously.
Summary of the invention
The object of this invention is to provide a kind of method of filtered water.
The method of filtered water provided by the invention, comprises the steps: to add potassium permanganate and ferrous salt in Xiang Yuanshui, carries out after flocculation reaction forms flco filtering after mixing again.
In aforesaid method, the water (as sanitary sewage or trade effluent) of described former water for taking from natural water body or retaining water body (as river, lake, pond or underground storage layer etc.) and can be used as the water of resource of water supply or contain organic pollutant; Described ferrous salt is selected from least one in ferrous sulfate, iron protochloride and Iron nitrate.
The mode that adds of described potassium permanganate and ferrous salt adds ferrous salt again for add or first add potassium permanganate to mix with former water after 10 seconds to 10 minutes simultaneously.
The molar ratio of described potassium permanganate and ferrous salt is 1:3 to 1:2, and preferably 1:3, is specifically determined by organic character in water.
The amount ratio of described ferrous salt and described former water is 0.05 ~ 0.3mmol:1L, and preferably 0.1mmol:1L, is specifically determined by organic character in water.
In described flocculation reaction step, the time is 10-30 minute; Concrete, under 20-30 DEG C of condition preferably 15 minutes; At 1-10 DEG C preferably 20 minutes even longer with promote throwing out, more preferably 20 minutes-40 minutes.
In described filtration step, filter assemblies used is hyperfiltration membrane assembly, specifically can be immersion hollow fiber ultrafiltration membrane module or immersion hollow micro-filtration membrane module.
Because potassium permanganate has oxygenizement, it can be oxidized ferrous iron, part pollutent in energy oxidizing water simultaneously, the ferric iron that original position forms has the ability of higher removal water pollutant, the flco that the flco of its formation forms than conventional ferric iron is large, the structure looser (fractal dimension is little) of flco, and the primary particle size of composition flco enlarges markedly, the cake layer that flco forms is more fluffy, thinner, thereby, in former water, add potassium permanganate and ferrous iron to carry out Chemical Pretreatment to former water, utilize potassium permanganate oxidation ferrous iron, the ferric efficient flocculating effect that organic effect and original position form, can reduce the concentration of water pollutant, improve flocculating effect, increase the primary particle size that forms flco, reduce degree of compactness and the thickness of film surface cake layer, pollute the object of water filtration thereby reach controlling diaphragm.
Brief description of the drawings
Fig. 1 is the operating pressure graph of a relation over time of water.
Fig. 2 is organic gel chromatography variation diagram in water.
Embodiment
Below in conjunction with specific embodiment, the present invention is further elaborated, but the present invention is not limited to following examples.Described method is ordinary method if no special instructions.Described starting material all can obtain from open commercial sources if no special instructions.In following embodiment, dissolved organic carbon (DOC, 0.45 μ m membrane filtration) utilize total organic carbon analyzer to adopt 680 DEG C of oxidation style analysis (TOC-VCPH, SHIMADZU, Japan), turbidity adopts turbidity analyser to analyze (WTW TURB555IR, Germany), and pH value adopts pH meter directly measure (Shanghai thunder magnetic) and obtain.
Embodiment 1
After dechlorination, add humic acids to obtain testing water distribution (being also former water) to tap water, the amount ratio of humic acids and tap water is 5mg:1L, and the basic parameter of this experiment water distribution is as follows: TOC is 4.08mg/L, and turbidity is 3.32NTU, and pH value is 7.95.
In above-mentioned experiment water distribution, add mol ratio is potassium permanganate and the protochloride molysite (amount ratio of this ferrous salt and former water is 0.1mmol:1L) of 1:3 simultaneously, first mix after within 1 minute, mixing and carry out again flocculation reaction 15 minutes in 25 DEG C, enter afterwards membrane reactor, carry out constant flow filtering by peristaltic pump, discharge is 20L/ (m
2h), when filtration, membrane filtration module used is PVDF(poly(vinylidene fluoride)) immersion (also external-compression type) hollow-fibre membrane, the water quality of gained water outlet is as follows: TOC is 1.57mg/L, and turbidity is 0.05NTU, and pH value is 7.40.
According to as above step, only do not add potassium permanganate and ferrous salt in contrast 1;
According to as above step, potassium permanganate and ferrous salt are replaced with to trivalent iron salt iron(ic) chloride, in contrast 2, all the other conditions are identical.
Water quality to above-mentioned two control treatment gained water outlets detects, and acquired results is as follows:
Contrasting 1 gained effluent quality: TOC is 3.29mg/L, and turbidity is 0.08NTU, and pH value is 7.89;
The effluent quality of contrast 2: TOC is 1.79mg/L, and turbidity is 0.06NTU, and pH value is 7.37;
As from the foregoing, utilize filter method provided by the invention, can significantly improve effluent quality.
Measure by the operating pressure relation over time of water after membrane reactor, acquired results as shown in Figure 1, as seen from the figure, in contrast 1, pressure rise is very fast, and add the test water distribution after potassium permanganate and ferrous salt, rate of pressure rise significantly reduces, and described in this embodiment, the method for filtered water can significantly reduce the film pollution that direct filtration causes as seen, is also better than contrasting 2.
Utilize gel chromatography (SEC) to be used for detecting the apparent molecular weight distribution in the present embodiment and contrast 1 and 2 water outlet water with ultraviolet active substance, concrete testing conditions is as follows: pillar-Waters Ultrahydrogel 250column (7.8mm × 300mm), moving phase-buffered soln is (by the NaCl aqueous solution of 0.1mol/L, the KH of 0.002mol/L
2pO
4the Na of the aqueous solution and 0.002mol/L
2hPO
4aqueous solution composition), NaCl, KH
2pO
4, Na
2hPO
4mol ratio be 0.1:0.002:0.002, pH value is 6.8), laboratory apparatus-high performance liquid chromatography (LC-10A, Shimadzu, Japan), detector-UV detector (SPD-10A, 254nm), moving phase speed-0.4mL/min.Polyethylene glycol (PEG) is used for calibrating the relation of mole and retention time.Water sample sample injection amount is 50 μ L, and acquired results is shown in Fig. 2.
As shown in Figure 2, after test water distribution being filtered according to the method for the present embodiment, there is better removal ability with respect to 2 pairs of organism of contrast.
Claims (6)
1. a method for filtered water, comprises the steps: to add potassium permanganate and ferrous salt in Xiang Yuanshui, carries out after flocculation reaction forms flco filtering after mixing again;
The molar ratio of described potassium permanganate and ferrous salt is 1:3 to 1:2;
The amount ratio of described ferrous salt and described former water is 0.05～0.3mmol:1L;
In described filtration step, filter assemblies used is hyperfiltration membrane assembly.
2. method according to claim 1, is characterized in that: described ferrous salt is selected from least one in ferrous sulfate, iron protochloride and Iron nitrate.
3. method according to claim 1 and 2, is characterized in that: the mode that adds of described potassium permanganate and ferrous salt adds ferrous salt again for add or first add potassium permanganate to mix with former water after 10 seconds to 10 minutes simultaneously.
4. method according to claim 1 and 2, is characterized in that: the amount ratio of described ferrous salt and described former water is 0.1mmol:1L.
5. method according to claim 1 and 2, is characterized in that: in described flocculation reaction step, the time is 10-30 minute.
6. method according to claim 1 and 2, is characterized in that: described hyperfiltration membrane assembly is immersion hollow fiber ultrafiltration membrane module.
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| CN201210560390.9A CN103058410B (en) | 2012-12-20 | 2012-12-20 | Water filtering method |
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| CN103058410B true CN103058410B (en) | 2014-06-25 |
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| CN104876316A (en) * | 2015-06-15 | 2015-09-02 | 河南城建学院 | Effective stone processing waste water treatment method |
| CN106865717A (en) * | 2017-04-17 | 2017-06-20 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | The device and application process of ferrous ion activation persulfate pretreatment lifting milipore filter water purification efficiency |
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| CN101264965A (en) * | 2008-04-11 | 2008-09-17 | 哈尔滨工业大学 | Method for removing As(V) from water |
| CN101774731B (en) * | 2010-01-27 | 2012-11-07 | 四川大学 | Enhanced coagulation-gas stripping-membrane integration method and device for lightening membrane pollution |
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