CN104071870B - The electro-flucculation process of heavy metal in efficient removal Drinking Water - Google Patents
The electro-flucculation process of heavy metal in efficient removal Drinking Water Download PDFInfo
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Abstract
The present invention relates to Drinking Water purification techniques field, be specially the electro-flucculation process of heavy metal in a kind of efficient removal Drinking Water.Magnesium or magnesium alloy is adopted to be anode material, adopt stainless steel, graphite or titanium alloy etc. as negative electrode, utilize the high reactivity magnesium hydroxide of electrochemical action and generation thereof to realize removing the object of heavy metal ion in Drinking Water, after process, every water-quality guideline all can meet drinking water standard.The present invention adopts magnesium or magnesium alloy as anode, not only can not introduce harmful iron, aluminum ion, also can introduce the appropriate magnesium ion useful to human body and hydroxide radical, is removing the consumption value that improve water in water while toxic heavy metal ion.Meanwhile, the present invention is optimized electric flucculation structure, the feature that its interelectrode distance is little, packing density is high overcomes the problem that the low system resistance caused of Drinking Water source conductivity is large, current consumption is large, cost is high, is applicable to the purifying treatment of heavy metals exceeding standard tap water or domestic water.
Description
Technical field
The present invention relates to Drinking Water purification techniques field, be specially the electro-flucculation process of heavy metal in a kind of efficient removal Drinking Water.
Background technology
Heavy metal refers generally to proportion and is greater than 4.0, the metal of period of element atom ordinal number more than 24.Arsenic, mercury, cadmium, lead, chromium, copper, zinc, nickel, manganese, silver etc. are mainly contained to the heavy metal that water surrounding pollutes, wherein maximum with arsenic, mercury, cadmium, Toxicity of Lead, and difficult, be the most common heavy metal contaminants of tap water, domestic water and irrigation water.
In the 50-70 age in 20th century, successively there is " minamata disease " event and " itai-itai disease " event of causing a sensation the world in Japan, causes very serious and irreversible injury to the health of people and psychology.These two events are all put into the world's " eight large public hazards " event, it serves to show that its harm is big, impact far-reaching, and its arch-criminal to be tap water mercury respectively exceed standard and cadmium exceeds standard.After this, heavy metal pollution of water body is subject to increasing attention, but increasingly sharpening of the sustained and rapid development of industry and mankind's activity, still make the water environmental problems that heavy metal contamination becomes more and more serious.All there is tap water and domestic water heavy metals exceeding standard phenomenon in the whole world, only in Bangladesh's just have 7,000 ten thousand people to be exposed to domestic water that arsenic exceeds standard, China and South America, North America, Australia, Europe and South East Asia Countries are also deeply hurt.In China, cadmium, Lead contamination problem are also day by day serious.Guangdong, Guangxi, Hunan, Sichuan, zhejiang and other places repeatedly report water Cd pollution and " cadmium rice " event, and the national survey result of 2008 shows, China has the rice cadmium of 10% to exceed standard on the market.China's Lead contamination is in recent years also day by day serious, and many ground frequent outburst Lead contamination such as Shanxi, Henan, Hunan, Guangdong and " blood lead " event, bring great injury to human body especially children.The national survey result of 2010 shows that China about has the arable land of 1/5 to receive heavy metal contamination, and this ratio is going up year by year.Extremely difficult reparation after heavy metal pollution of soil, as controlled not in time, will cause irreversible damaging influence to agricultural, ecology and human health.
The root of above heavy metal event is all tap water, domestic water and irrigation water heavy metals exceeding standard, solves tap water, domestic water and irrigation water heavy metals exceeding standard problem extremely urgent.But, for tap water, domestic water and irrigation water heavy metals exceeding standard problem, not efficient, low cost, green treatment technology at present.Because the heavy metal in tap water, domestic water and irrigation water is diluted greatly, its general character is that concentration is lower, and the water yield is large.Existing feasible treatment technology mainly contains absorption, ion-exchange, reverse osmosis, but all there is respective problem.Heavy metal absorbent is made generally in particle, and adsorption activity is not high, and adsorptive capacity is limited, and not easily regenerates, and can produce a large amount of hazardous solid waste when the water yield is large.Ion-exchange material selectivity is not good, in removal water while heavy metal ion, except the mineral composition such as magnesium, calcium in anhydrating, and can discharge a large amount of hydrogen ions or sodium ion, increase acidity or the salinity of water, be unfavorable for HUMAN HEALTH, and cost is higher.Reverse osmosis method is high to inflow requirement, and pretreatment procedure is loaded down with trivial details, investment and running cost high, and all mineral elements in water all to be removed, make human body cannot by the beneficial element needed for drinking-water acquisition.In addition, the dense water containing heavy metal ion that reverse osmosis produces needs process further, extends process line, further increases cost.
Compared with above conventional art, electric flocculence removing in water, low-concentration heavy metal time to have clearance high, the quantity of slag is few and recyclable, the advantages such as moderate cost.But, existing electric flocculation technique generally adopts iron, aluminium as sacrificial anode, the health problem that water after process there will be variable color, dulling and iron, aluminum ion exceed standard (drinking water standard specify iron, the higher limit of aluminium be respectively 0.3mg/L and 0.2mg/L) brings, is not suitable for for Drinking Water process.In addition, the specific conductivity of tap water, domestic water and irrigation water is general lower, is not suitable for electrochemically processing.
Summary of the invention
The object of the present invention is to provide the electro-flucculation process of heavy metal in a kind of efficient removal Drinking Water, can, in removal water while heavy metal ion, introduce appropriate magnesium ion and hydroxide radical, form the alkalescent mineral substance water useful to HUMAN HEALTH.
Technical scheme of the present invention is:
An electro-flucculation process for heavy metal in efficient removal Drinking Water, adopts magnesium or magnesium alloy to be anode material, utilizes the high reactivity magnesium hydroxide of electrochemical action and generation thereof to realize removing the object of heavy metal ion in Drinking Water.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, anode material directly adopts magnesium or magnesium alloy plate; Or anode material adopts magnesium powder powder metallurgy to be made into porous magnesium electrode, and its aperture is at 0.5 ~ 1000 μm, and porosity is 5% ~ 40%.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, preferably, the aperture of porous magnesium electrode is at 100 ~ 500 μm, and porosity is 10% ~ 30%.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, the making method of porous magnesium electrode is: select particle diameter at the pure magnesium powder of 5 ~ 500 object or magnesium alloy powder, be pressed into sheet, then under argon gas atmosphere protection, at 480 ~ 550 DEG C, sinter porous magnesium or magnesium alloy plate into; Or, under argon shield, directly make porous magnesium or magnesium alloy plate by method one step of hot pressing.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, preferably, selects particle diameter at the pure magnesium powder of 5 ~ 50 object or magnesium alloy powder.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, concrete technology parameter is as follows:
Heavy metals exceeding standard Drinking Water pH value is 5.5 ~ 8, adopts current density 0.2 ~ 10mA/cm
2, operating voltage is 0.1 ~ 5V, and polar plate spacing is 1 ~ 5mm, and electrolysis time is 30 ~ 480s, and water outlet time of repose is no less than 15min, and supernatant liquor suspension content is not higher than 0.05mg/L; Processing water current consumption per ton is 0.01 ~ 0.4kwh, and consume MAGNESIUM METAL 5 ~ 75g, electrode life reaches more than 10000 hours.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, as required after standing clarification, increases single filter.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, electrochemical process can not introduce any ion except magnesium ion and hydroxide radical in water, and there is not other any adverse factor; After process, in water, magnesium ion content is at 1 ~ 120mg/L, and pH value, between 7.1 ~ 8.5, meets drinking water standard, and belongs to the alkalescent mineral substance water useful to human body.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, simultaneously or remove one or more heavy metal ion of arsenic in tap water, domestic water or farmland irrigation water, cadmium, lead, chromium, mercury, copper, zinc, nickel, manganese, silver individually, and do not produce any adverse factor, water outlet reaches drinking water standard after leaving standstill clarification.
The electro-flucculation process of heavy metal in described efficient removal Drinking Water, the high reactivity magnesium hydroxide that electrochemical process produces has very strong adsorptive power, microorganism in active adsorption tap water or domestic water, silt suspended substance, form flco to be removed by sedimentation, reach the object of deep purifying.
Design philosophy of the present invention is:
Research finds, newly-generated magnesium hydroxide has very high activity, can heavy metal ion effectively in planar water and other be suspended thing, form floss together and precipitate, realizing the object of removal heavy metal.The present invention adopts magnesium or magnesium alloy as anode, not only harmful iron, aluminum ion can not be introduced in electrochemical process, also can introduce the appropriate magnesium ion useful to human body, remove the consumption value that improve water in water while toxic heavy metal ion.Meanwhile, magnesium hydroxide dissolves the hydroxide radical ionized out on a small quantity in water can make water be weakly alkaline, also useful to HUMAN HEALTH.Because magnesium hydroxide even floccule is tiny, not easily occur blockage problem, the present invention adopts high-density filling structure, and polar plate spacing is little, and surface-area is large, and system resistance is very low, is applicable to Drinking Water and the irrigation water process of low conductivity.
The key of the inventive method is to select magnesium or magnesium alloy as anode material, and electric flocculation treatment device is made high-density filling structure, in order to process the tap water or domestic water that heavy metal ion exceeds standard.
Select magnesium or magnesium alloy as anode material, can not introduce any adverse factor while heavy-metal ion removal, form weakly alkaline, tap water containing appropriate magnesium ion, its ultimate principle can represent with following reaction formula simultaneously:
Cathodic reaction: 2H
2o+2e
-→ H
2↑+2OH
-
Anodic reaction: Mg-2e
-→ Mg
2+
The newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and (newly-generated tiny magnesium hydroxide granularity is 3 ~ 50nm, and its specific surface area is 300 ~ 1000m
2/ g), can heavy metal ion effectively in planar water and suspended substance, and form the flco that is easy to precipitate and separate from water.Meanwhile, magnesium hydroxide can oligodynamical in water, produces appropriate magnesium ion and hydroxide ion, forms the alkalescent water that be rich in beneficial mineral element magnesium useful to human body.
Advantage of the present invention and beneficial effect as follows:
1, the present invention adopts magnesium or magnesium alloy as sacrifice pole, and can remove the toxic heavy metal ion such as arsenic, mercury, cadmium, lead in Drinking Water, clearance can reach more than 95% simultaneously, and after process, heavy metal content meets drinking water standard.
2, the present invention adopts magnesium or magnesium alloy as sacrifice pole, can not introduce the factor to human health such as iron, aluminium in Drinking Water.Meanwhile, the alkalescent water (pH value 7.1 ~ 8.5) that be rich in beneficial mineral element magnesium (1 ~ 120mg/L) useful to human body can be formed.
3, the present invention adopts high-density filling structure, interelectrode distance is less, surface-area is larger, the problems such as the low system resistance caused of Drinking Water specific conductivity is large, operating voltage is high, current consumption is large can be overcome, process water per ton only power consumption 0.01 ~ 0.4kwh, processing cost 0.3 ~ 1.4 yuan, electrode life reaches 3000 ~ 10000 hours, effectively can reduce operating voltage, reduce current consumption, extend electrode life, and overcome the low problem of Drinking Water specific conductivity, there is higher practical value.
4, the electro-flucculation process in a present invention optionally step directly removes the heavy metal ion in tap water and domestic water, and does not introduce any adverse factor.Meanwhile, also can introduce appropriate magnesium ion and hydroxide ion, form the alkalescent mineral substance water useful to human body.The inventive method is applicable to the waterworks in heavy metals exceeding standard area, community or single family and uses, and has the advantages such as technique is simple, cost is low, electrode life is long.
Accompanying drawing explanation
Fig. 1 is the error bar figure of arsenic in embodiment 5, mercury, cadmium, plumbous four heavy metal species ion remaval rates.In the middle of error bar, stain represents average removal rate, and upper and lower ends horizontal line represents clearance fluctuation range.
Fig. 2 is the concentration of arsenic in embodiment 5 in electric flocculating experiment water outlet in continuous 360 hours, mercury, cadmium, plumbous four heavy metal species ions.
Embodiment
In the specific embodiment of the invention, for the treatment of the electro-flucculation process of Drinking Water, magnesium or magnesium alloy is adopted to be anode material, adopt stainless steel, graphite or titanium alloy etc. as negative electrode, the high reactivity adsorption of magnesium hydroxide utilizing electrochemical action to produce removes the object of the heavy metal element in water, and in water, introduce the magnesium ion and hydroxide radical that are of value to HUMAN HEALTH in right amount.The method can remove the contents of many kinds of heavy metal ion such as arsenic, mercury, cadmium, lead in water simultaneously, and does not produce any adverse factor, namely meets drinking water standard after water outlet standing clarification detection is qualified.Wherein,
Heavy metals exceeding standard Drinking Water pH value is 5.5 ~ 8, adopts current density 0.2 ~ 10mA/cm
2, operating voltage is 0.1 ~ 5V, and polar plate spacing is 1 ~ 5mm, and electrolysis time is 30 ~ 480s, and water outlet time of repose is no less than 15min, and supernatant liquor suspension content is not higher than 0.05mg/L.If necessary, single filter can be added after standing clarification.Processing water current consumption per ton is 0.01 ~ 0.4kwh, and consume MAGNESIUM METAL 5 ~ 75g, electrode life can reach more than 10000 hours.
Aforesaid method can not introduce any ion except appropriate magnesium ion and appropriate hydroxide radical in treating processes in water, and there is not other any adverse factor.After process, in water, magnesium ion content is at 1 ~ 120mg/L, and pH value, between 7.1 ~ 8.5, meets drinking water standard, and belongs to the alkalescent mineral substance water useful to human body.
In the present invention, the magnesium alloy of pure magnesium or any trade mark can be selected as anode material, wherein with the low magnesium alloy of heavy metal (copper, cadmium, zinc etc.) content as well, such as: Mg99.00, Mg99.50, AZ40, AZ80, AZ31, AZ41 or AK60 etc.Also porous magnesium electrode can be made by the method for powder metallurgy, as the anode material of electro-flucculation process with pure magnesium or magnesium alloy powder.
Traditional iron, aluminum anode electro-flucculation process can introduce excessive iron, aluminum ion in water, unfavorable to HUMAN HEALTH, are thus not suitable for for Drinking Water process.The present invention adopts magnesium or magnesium alloy as anode, not only can not introduce harmful iron, aluminum ion, also can introduce the appropriate magnesium ion useful to human body and hydroxide radical, is removing the consumption value that improve water in water while toxic heavy metal ion.Meanwhile, the present invention is optimized structure, the feature that its interelectrode distance is little, packing density is high overcomes the problem that the low system resistance caused of Drinking Water source conductivity is large, current consumption is large, cost is high, is applicable to the purifying treatment of heavy metals exceeding standard tap water or domestic water.In general, containing the tap water of heavy metal or domestic water after the inventive method process, every water-quality guideline all can meet drinking water standard.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
Inner Mongol city underground water arsenic exceeds standard, former water arsenic concentration 43 μ g/L, specific conductivity 513 μ s/cm, pH value is about 7.8, directly enter electric flocculation plant and (be of a size of 45 × 45 × 250mm, when not working, volume is 0.25L, and plate is AZ31, and stainless steel is as negative electrode, interlaced arranged in parallel between pole plate, adjacent anode pole plate and cathode plate spacing are 3mm) process, flooding velocity is 4L/ hour, and working current is set to 0.1A.Now, electric flocculation plant operating voltage is 0.55V, and plate current density is 0.2mA/cm
2.Water through electric flocculation plant electrolysis treatment 240s enters settling pond, and after leaving standstill 60min, sampling detects arsenic concentration and correlation water parameter in water outlet.Detected result shows, the arsenic concentration after treatment in water is down to 1.7 μ g/L, and pH value is 8.2, and magnesium ion concentration is 6.9mg/L, meets drinking water standard.This treatment process stable performance, revision test more than 10 times, water outlet arsenic concentration all can be up to standard.
In the present embodiment, the newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and newly-generated tiny magnesium hydroxide median size is 4.5nm, and its specific surface area is 652m
2/ g, can heavy metal ion effectively in planar water and suspended substance, and forms the flco that is easy to precipitate and separate from water.Experimentally parameter and result can computing water consumption electric energy per ton 0.014kwh, consumption magnesium electrode 10.9g.Under these conditions, the electrode life of this device is more than 10000 hours.
Embodiment 2
Lake, Yunnan arsenic exceeds standard, former water arsenic concentration 112 μ g/L, specific conductivity 273 μ s/cm, pH value is about 6.9, directly enter electric flocculation plant and (be of a size of 45 × 45 × 250mm, when not working, volume is 0.25L, and plate is AZ31, and stainless steel is as negative electrode, interlaced arranged in parallel between pole plate, adjacent anode pole plate and cathode plate spacing are 1mm) process, flooding velocity 2L/ hour, working current is set to 0.2A.Now, operating voltage is 1.18V, and plate current density is 0.4mA/cm
2.Water through electric flocculation plant electrolysis treatment 30s enters settling pond, and after leaving standstill 45min, sampling detects water outlet arsenic concentration and correlation water parameter.Detected result shows, the arsenic concentration after treatment in water is down to 2.3 μ g/L, and pH value is 7.5, and magnesium ion concentration is 32.3mg/L, meets drinking water standard.
In the present embodiment, the newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and newly-generated tiny magnesium hydroxide median size is 5.7nm, and its specific surface area is 503m
2/ g, can heavy metal ion effectively in planar water and suspended substance, and forms the flco that is easy to precipitate and separate from water.Experimentally parameter and result can computing water consumption electric energy per ton 0.13kwh, consumption magnesium electrode 35g.Under these conditions, the electrode life of this device is about 4800 hours.
Embodiment 3
Guangxi He Jiang cadmium exceeds standard former water cadmium concentration 287 μ g/L, specific conductivity 315 μ s/cm, pH value is about 6.7, and (be of a size of 45 × 45 × 250mm, when not working, volume is 0.25L directly to enter electric flocculation plant, plate is AZ31, stainless steel is as negative electrode, interlaced arranged in parallel between pole plate, and adjacent anode pole plate and cathode plate spacing are 5mm) process, flooding velocity 2L/ hour, working current is set to 0.3A.Now, operating voltage is 1.46V, and plate current density is 0.6mA/cm
2.Water through electric flocculation plant electrolysis treatment 480s enters settling pond, and after leaving standstill 45min, sampling detects water outlet arsenic concentration and correlation water parameter.Detected result shows, the cadmium concentration after treatment in water is down to 2.1 μ g/L, and pH value is 7.7, and magnesium ion concentration is 20.4mg/L, meets drinking water standard.
In the present embodiment, the newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and newly-generated tiny magnesium hydroxide median size is 6.3nm, and its specific surface area is 441m
2/ g, can heavy metal ion effectively in planar water and suspended substance, and forms the flco that is easy to precipitate and separate from water.Experimentally parameter and result can computing water consumption electric energy per ton 0.23kwh, consumption magnesium electrode 46g.Under these conditions, the electrode life of this device is about 3300 hours.
Embodiment 4
With tap water preparation containing arsenic 110 μ g/L, mercury 53 μ g/L, cadmium 102 μ g/L, the former water of plumbous 230 μ g/L, specific conductivity is 345 μ s/cm, and pH value is 6.9, directly enters electric flocculation plant and processes.Electricity flocculation plant is of a size of 45 × 45 × 250mm, and when not working, volume is 0.25L, and plate is the porous electrode obtained at 520 DEG C of sintering with the pure magnesium powder of 80 order, and its porosity is about 25%, and mean pore size is about 45 μm; Stainless steel is as negative electrode, interlaced arranged in parallel between pole plate, and adjacent anode pole plate and cathode plate spacing are 2mm.Flooding velocity is 2L/ hour, and working current is set to 0.2A, and operating voltage is 0.73V.Water through electric flocculation plant electrolysis treatment 120s enters settling pond, and after leaving standstill 60min, sampling detects water outlet arsenic concentration and correlation water parameter.Detected result shows, the arsenic after treatment in water, mercury, cadmium, lead concentration are down to 3.2 μ g/L, 0.26 μ g/L, 1.07 μ g/L and 8.9 μ g/L respectively, and pH value is 8.0, and magnesium ion concentration is 10.3mg/L, meets drinking water standard.
In the present embodiment, the newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and newly-generated tiny magnesium hydroxide median size is 5.3nm, and its specific surface area is 556m
2/ g, can heavy metal ion effectively in planar water and suspended substance, and forms the flco that is easy to precipitate and separate from water.Experimentally parameter and result can computing water consumption electric energy per ton 0.08kwh, consumption magnesium electrode 32g.Under these conditions, the electrode life of this device is about 3800 hours.
Embodiment 5
With tap water preparation containing arsenic 110 μ g/L, mercury 53 μ g/L, cadmium 102 μ g/L, the former water of plumbous 237 μ g/L, specific conductivity is 345 μ s/cm, and pH value is 7.1, directly enter electric flocculation plant and (be of a size of 45 × 45 × 250mm, when not working, volume is 0.25L, and plate is AZ31, and stainless steel is as negative electrode, interlaced arranged in parallel between pole plate, adjacent anode pole plate and cathode plate spacing are 4mm) process, flooding velocity is 2L/ hour, and working current is set to 0.2A.Now, operating voltage is 1.1V, and plate current density is 0.4mA/cm
2.Water through electric flocculation plant electrolysis treatment 360s enters settling pond, and after leaving standstill 60min, sampling detects water outlet arsenic concentration and correlation water parameter.Detected result shows, the arsenic after treatment in water, mercury, cadmium, lead concentration are down to 2.8 μ g/L, 0.13 μ g/L, 0.55 μ g/L and 4.6 μ g/L respectively, and pH value is 8.1, and magnesium ion concentration is 8.7mg/L, meets drinking water standard.
In the present embodiment, the newly-generated tiny magnesium hydroxide of magnesium anode has very high activity and specific surface area, and newly-generated tiny magnesium hydroxide granularity is 4.9nm, and its specific surface area is 613m
2/ g, can heavy metal ion effectively in planar water and suspended substance, and forms the flco that is easy to precipitate and separate from water.Experimentally parameter and result can computing water consumption electric energy per ton 0.12kwh, consumption magnesium electrode 33g.Under these conditions, the electrode life of this device is about 5000 hours.
For investigating the reliability of magnesium anode electricity flocculation plant removing heavy metals performance, according to the condition in embodiment 5, it is tested continuously, and sampling detects the concentration of heavy metal ion in water outlet.Result shows that above-mentioned electric flocculation plant all has very high clearance (Fig. 1) and stability (Fig. 2) to the arsenic in tap water, mercury, cadmium, lead, is applicable to carrying out continuous water treatment.
As shown in Figure 1, under the condition in embodiment 5, electric flocculation plant all reaches more than 95% to arsenic, mercury, cadmium, plumbous clearance in water, illustrates that it all has good removal effect to the various heavy coexisted in water.
As shown in Figure 2, under condition in embodiment 5, electricity flocculation plant runs 360 hours continuously, and the concentration of the heavy metals such as the arsenic in water outlet, mercury, cadmium, lead is all lower than " drinking water sanitary standard " (GB5749-2006) that country is up-to-date, and its removing heavy metals is stable and reliable for performance.
Embodiment result shows, the present invention using magnesium or magnesium alloy as anode, stainless steel as negative electrode, can effectively remove life drink in heavy metal element.The method can remove the contents of many kinds of heavy metal ion such as arsenic, mercury, cadmium, lead in Drinking Water simultaneously, and clearance all can reach more than 95%.These apparatus and method have the advantages such as technique is simple, cost is low, electrode life is long, dependable performance, less energy consumption, waste residue amount easily reclaim less, can improve the consumption value of water, be applicable to the Drinking Water process in heavy metals exceeding standard area without any adverse factor.
Claims (8)
1. efficiently remove the electro-flucculation process of heavy metal in Drinking Water for one kind, it is characterized in that, adopt porous magnesium or magnesium alloy to be anode material, utilize the high reactivity magnesium hydroxide of electrochemical action and generation thereof to realize removing the object of heavy metal ion in Drinking Water;
Anode material adopts pure magnesium powder or magnesium alloy powder metallurgy to be made into porous magnesium or magnesium alloy electrode, and its aperture is at 0.5 ~ 1000 μm, and porosity is 5% ~ 40%;
The making method of porous magnesium or magnesium alloy electrode is: select particle diameter at the pure magnesium powder of 5 ~ 500 object or magnesium alloy powder, be pressed into sheet, then under argon gas atmosphere protection, sinters porous magnesium or magnesium alloy at 480 ~ 550 DEG C into; Or, under argon shield, directly make porous magnesium or magnesium alloy by method one step of hot pressing.
2. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 1, it is characterized in that, preferably, select particle diameter at the pure magnesium powder of 5 ~ 50 object or magnesium alloy powder.
3. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 1, it is characterized in that, preferably, the aperture of porous magnesium electrode is at 100 ~ 500 μm, and porosity is 10% ~ 30%.
4., according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 1, it is characterized in that, concrete technology parameter is as follows:
Heavy metals exceeding standard Drinking Water pH value is 5.5 ~ 8, adopts current density 0.2 ~ 10mA/cm
2, operating voltage is 0.1 ~ 5V, and polar plate spacing is 1 ~ 5mm, and electrolysis time is 30 ~ 480s, and water outlet time of repose is no less than 15min, and supernatant liquor suspension content is not higher than 0.05mg/L; Processing water current consumption per ton is 0.01 ~ 0.4kwh, and consume MAGNESIUM METAL 5 ~ 75g, electrode life reaches more than 10000 hours.
5. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 4, it is characterized in that, as required after standing clarification, increase single filter.
6. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 4, it is characterized in that, electrochemical process can not introduce any ion except magnesium ion and hydroxide radical in water, and there is not other any adverse factor; After process, in water, magnesium ion content is at 1 ~ 120mg/L, and pH value, between 7.1 ~ 8.5, meets drinking water standard, and belongs to the alkalescent mineral substance water useful to human body.
7. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 4, it is characterized in that, simultaneously or remove one or more heavy metal ion of arsenic in tap water, domestic water or farmland irrigation water, cadmium, lead, chromium, mercury, copper, zinc, nickel, manganese, silver individually, and do not produce any adverse factor, water outlet reaches drinking water standard after leaving standstill clarification.
8. according to the electro-flucculation process of heavy metal in efficient removal Drinking Water according to claim 4, it is characterized in that, the high reactivity magnesium hydroxide that electrochemical process produces has very strong adsorptive power, microorganism in active adsorption tap water or domestic water, silt suspended substance, form flco to be removed by sedimentation, reach the object of deep purifying.
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| CN85202203U (en) * | 1985-06-09 | 1986-04-02 | 中国市政工程中南设计院 | Domestic water purifier |
| CN101208271A (en) * | 2005-07-05 | 2008-06-25 | 水研究控股有限公司 | Water treatment apparatus |
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| CN85202203U (en) * | 1985-06-09 | 1986-04-02 | 中国市政工程中南设计院 | Domestic water purifier |
| CN101208271A (en) * | 2005-07-05 | 2008-06-25 | 水研究控股有限公司 | Water treatment apparatus |
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