CN105417798A - Processing method and equipment for softening hard water through electric flocculation - Google Patents

Processing method and equipment for softening hard water through electric flocculation Download PDF

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Publication number
CN105417798A
CN105417798A CN201511018333.8A CN201511018333A CN105417798A CN 105417798 A CN105417798 A CN 105417798A CN 201511018333 A CN201511018333 A CN 201511018333A CN 105417798 A CN105417798 A CN 105417798A
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water
softening
dividing plate
reaction pond
tube settler
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欧群飞
赵勤
张杨
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Chengdu Feichuang Technology Co Ltd
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Chengdu Feichuang Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/22Eliminating or preventing deposits, scale removal, scale prevention

Abstract

The invention relates to the technical field of hard water softening treatment, and discloses a processing method and equipment for softening hard water through flocculation. The method orderly integrates a chemical precipitation method, an inclined tube precipitation method, and an electrodialysis technology, thus has a prominent effect on processing hard water, and has the advantages of low cost, simple process, large hardness reduction, and wide application range. In the equipment, an alkali feeding reaction tank, an electric flocculation reaction tank, an inclined tube precipitation tank, and a medium filtering system cooperate with each other to process hard water; the hard water is processed in the units mentioned above in sequence and is delivered among the units through overflowing; the hard water is effectively softened, the effect is good, the application range is wide, moreover, the water pump is not used, and the energy consumption is saved.

Description

A kind for the treatment of process of electricity flocculation softening of water and equipment
Technical field
The present invention relates to water softening processing technology field, be specifically related to a kind for the treatment of process and equipment of electricity flocculation softening of water.
Background technology
Whole salts in water are normally scaled calcium carbonate to measure by water hardness, and hardness receives extensive concern as an important water-quality guideline in tap water and process water.On the living conditions, water hardness is too high, is used for washing can make the non-foaming foam of soap and cause waste; Easily make the hardening embrittlement of fibres for fabrics with hard water is washed and damages; With hard water have a bath, wash hair time have the sensation of astringent stickness; With hard water burn beans and meat not easily ripe rotten; Boil water with hard water and easily make kettle fouling, waste fuel more than 1/3.In HUMAN HEALTH, drink high hardness and easily make people suffer from temporary gastrointestinal upset, abdominal distension, have loose bowels, be vented many, even cause the diseases such as urinary stone disease, serious harm HUMAN HEALTH.Removing hardness ions in water is the fundamental way solving fouling, improve water water safety, purify water.
Electric flocculation technique is under alive effect outside, the positively charged ion utilizing soluble anode to produce is hydrolyzed in the solution, be polymerized a series of multinuclear hydroxo complex of generation and oxyhydroxide, as the organic pollutant in flocculation agent absorption effluent and other colloidalmaterials, the oxygen simultaneously produced on anode and negative electrode and the micro-bubble of hydrogen have good adhesion property, have the effect being separated cohesion micelle and suspended substance.Electricity flocculation plant makes the impurity in water, metal ion etc. be deposited on negative electrode gradually by electrochemical reaction, trend is found the most stable state by various composition and compound under the effect of electric current, thus form a solid matter existed with non-colloid or non-dissolved state, but single electric flocculation technique removes the poor effect of the solubility calcium magnesium ion in waste water.
At present as the multiple technologies such as chemical precipitation, ion-exchange, nanofiltration, reverse osmosis, electrodialysis, electrodialysis reversal all can be applicable to hard water softening, but often kind for the treatment of technology has its limitation: 1) ion exchange method adopts specific Zeo-karb, with sodium ion, the calcium ions and magnesium ions in water is cemented out, thus avoid and generate incrustation scale with the rising of temperature, water hardness can be down to 0 by the method, but Zeo-karb price is high, work-ing life is short, is not suitable for extensive hard water softening; 2) membrane separation process refers to and utilizes nanofiltration membrane (NF) and reverse osmosis membrane (RO) to tackle calcium ions and magnesium ions in water, thus fundamentally reduce water hardness, but the method has higher requirements to intake pressure, facility investment, running cost are all higher; 3) chemical precipitation method points in water to add lime or special precipitation agent, then filters, and is mainly used for the high hardness processing large discharge, but hardness can only be dropped to certain scope.Thus, the defect that the hardness clearance existed for current water softening technology is low, invents the high water softening treatment process of a kind of hardness clearance and equipment, for water resources sustainable application and ensure that HUMAN HEALTH has great importance.
Summary of the invention
The low defect of hardness clearance that the present invention exists to solve current water softening technology, proposes a kind for the treatment of process and equipment of electricity flocculation softening of water.
The present invention to achieve these goals, a kind for the treatment of process of electricity flocculation softening of water is provided, the method is passed through orderly combining of Technology such as electricity flocculation and chemical precipitation method, tube settling, electrodialysis, for the treatment of hard water, Be very effective, it is low that this treatment process has cost, and process is simple, the advantage that hardness clearance is high, widely applicable.
The treatment process of a kind of electricity flocculation of the present invention softening of water, its concrete steps are as follows:
(1), calculate the consumption that should add precipitation agent according to original water hardness value, and to adding the precipitation agent adding respective amount in alkali reaction pond, aeration, makes Ca simultaneously 2+, Mg 2+formed hydrochlorate or the small suspended particulate of oxyhydroxide;
(2), make to react with precipitation agent in step (1) after water enter in electric flocculation tank, by electrochemical reaction, under External Electrical Field, make small suspended particulate become macrobead by electric throwing out;
(3), water that electricity in step (2) flocculates out is entered in tube settler to carry out precipitation 1-4h, obtain supernatant liquor, reduce most of total solid content;
(4), make the tube settler supernatant liquor obtained in step (3) enter media filtration system, by the crown_interception of medium, depth type filtration, removes suspended substance, effectively reduces total solid content, ensures electrodialysis inflow requirement;
(5), making the water in step (4) after filtration enter intermediate pool by adding after acid for adjusting pH value is 5-8 in equalizing tank, finally entering electrodialysis, removing deliquescent ion in water, reducing specific conductivity, obtain softening water.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the precipitation agent described in step (1) is alkali and the carbonate mixture of any mass ratio, and wherein alkali is one or both in sodium hydroxide or potassium hydroxide; Carbonate is one or both in sodium carbonate or salt of wormwood.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the consumption of step (1) described precipitation agent is:
5(D/1×10 5)×V≥N≥(D/1×10 5)×V
Wherein N is the amount of substance that should add precipitation agent; D is the hardness value of pending hard water, unit ppm; V is the cumulative volume of pending hard water, unit L, and wherein the consumption of precipitation agent is too high can increase electrodialytic treatment time in later stage and load, increase the consumption of acid, cost increases, and consumption can not make the calcium ions and magnesium ions in hard water generate small suspended particulate completely very little, affects water softening effect.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, step (1) chemical equation is:
2OH -+CO 2→CO 3 2-+H 2O;
Ca 2++CO 3 2-→CaCO 3↓;
Mg 2++CO 3 2-→MgCO 3↓;
Ca 2++OH -→Ca(OH) 2↓;
Mg 2++OH -→Mg(OH) 2↓;
Mg 2++OH -+HCO 3 -→MgCO 3↓+H 2O;
Ca 2++OH -+HCO 3 -→CaCO 3↓+H 2O。
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the aeration described in step (1) can increase the meltage of carbonic acid gas in water, generates more carbonate, makes the calcium ions and magnesium ions dissolved in hard water more generate Precipitation.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the media filtration system described in step (4) is F6048HM Series Filter.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the acid described in step (5) is one or both in hydrochloric acid, sulfuric acid.
In the treatment process of above-mentioned a kind of electricity flocculation softening of water, the deliquescent ion described in step (5) comprises Na +, K +, Cl -, SO 4 2-.
The treatment process of a kind of electricity flocculation of the present invention softening of water, the method first utilizes precipitation agent and the Ca be dissolved in hard water 2+, Mg 2+reaction generates the insoluble molecule that is suspended in water, but due to particle too little, can not directly adopt tube settling or media filtration to remove completely; Then by a series of multinuclear hydroxo complex and the oxyhydroxide of electricity flocculation generation, utilize the adsorption that multinuclear hydroxo complex and oxyhydroxide have, and under the oxygen that electric field and electrolysis generate is worked in coordination with the adhesive attraction of the micro-bubble of hydrogen, the molecule of suspension adsorbed and is bonded together, forming macrobead; Again by tube settling, remove the macrobead of easily precipitation, crossed the macrobead not easily precipitated filtering suspension by media filtration system; Finally by electrodialysis except the solvability ion in anhydrating, thus obtain softening water.The method is through reasonably sequence and combination, by orderly combining of Technology such as electricity flocculation and chemical precipitation method, tube settling, electrodialysis, processes, dissolve Ca in hard water to hard water 2+, Mg 2+clearance>=95%, be more than 1.3 times of common water softening treatment process effect, water softening efficiency is higher, better effects if, and not containing other foreign ions, softening water quality better.It is low that this treatment process has cost, and process is simple, the advantage that hardness clearance is high, widely applicable.
The present invention to achieve these goals, the treatment facility of a kind of electricity flocculation of further proposition softening of water, comprise main body and media filtration system, described main body comprises and adds alkali reaction pond and tube settler, and described main body also comprises electric flocculation tank, described in add alkali reaction pond, electric flocculation tank is communicated with successively with tube settler, hard water is made to enter each reaction tank stepwise disposal successively, effectively can remove the calcium ions and magnesium ions in hard water, effective, wide adaptability.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein adds alkali reaction pond for the Ca dissolved in hard water 2+, Mg 2+carry out reaction treatment, by the Ca of the overwhelming majority in hard water 2+, Mg 2+separating out and form small particulate matter, is the visual plant ensureing hardness clearance.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, electricity flocculation module is wherein housed in electric flocculation tank, and the plate material of electric flocculation group is the one in metallic aluminium, iron, the molecule that can effectively flocculate in water, forming macrobead, is the visual plant improving hardness clearance.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein tube settler adopts the principle of tube settling, precipitates the macrobead thing except the easy precipitation in anhydrating, ensures the normal filtration of media filtration system, avoiding blocking, is also the visual plant removing most of calcium magnesium precipitate thing.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein media filtration system includes water pipe, medium filter and rising pipe, and being in order to except the not settling particulate matter in anhydrating, is the visual plant improving hardness clearance.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein be provided with water leg above tube settler, the inhalent siphon of media filtration system is connected with water leg, add between alkali reaction pond and electric flocculation tank and have dividing plate a, dividing plate b is had between described electric flocculation tank and tube settler, add between alkali reaction pond and tube settler and have dividing plate c, its median septum c is than dividing plate a height 20-40cm, dividing plate a is than dividing plate b height 10-20cm, dividing plate b is than water leg height 10-20cm, be conducive to the spilling processing rear water, can process hard water step by step, and save energy.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein add alkali reaction pond, electric flocculation tank and tube settler one complete, compact in design, good looking appearance is generous, is convenient to install and maintenance.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, also comprises the aisle adding the body upper that alkali reaction pond, electric flocculation tank and tube settler form, at the cat ladder of main body side, is conducive to management and the maintenance of equipment.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein add for funnel-form bottom alkali reaction pond, electric flocculation tank and tube settler, hopper base is provided with relief outlet, for precipitating or the discharge of waste liquid, is conducive to the repair and maintenance of equipment.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water, wherein adds alkali reaction pond, the material of electric flocculation tank and tube settler is one in steel, iron, alloy.
The treatment facility of above-mentioned a kind of electricity flocculation softening of water is adopted to carry out sofening treatment to hard water, its treatment process is: (1), to be passed into by pending hard water and add in alkali reaction pond (11), then add precipitation agent to adding alkali reaction pond (11), aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond (11) median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank (16) from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank (16) median water level raises gradually, the water containing macrobead thing in step (2) enters tube settler (15) to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler (15) median water level raises gradually, supernatant liquor enters in water leg (14) by overflow, then enters medium filter (5) by inhalent siphon (6), removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter (5) filtered enters into equalizing tank by rising pipe (10), and adding acid for adjusting pH value is enter intermediate pool after 5-8, finally enters electrodialysis, obtains softening water;
This equipment is by adding alkali reaction pond, electric flocculation tank, cooperatively interacting between tube settler and media filtration system, step by step sofening treatment is carried out to hard water by the mode of overflow, not only effective sofening treatment is carried out to hard water, effective, suitability is wide, and save water pump, save energy consumption.
compared with prior art, remarkable difference of the present invention and beneficial effect are:
1, the inventive method combines the techniques such as chemical precipitation method, electric flocculence, inclined tube pipe precipitation, electrodialysis, play the advantage of various treatment process, maximize favourable factors and minimize unfavourable ones, overcome the limitation of single treatment process, solve the defect that the hardness clearance of current water softening technology existence is low.
2, electricity is flocculated electrochemical appliance creative use in high hardness water process by this forwarding method, opens a kind of new high hardness water treatment process, strengthens the removal effect of high hardness water process, improve hardness clearance.
3, present device is by adding alkali reaction pond, electric flocculation tank, cooperatively interacting between tube settler and media filtration system, step by step sofening treatment is carried out to hard water by the mode of overflow, not only effective sofening treatment is carried out to hard water, effective, hardness clearance >=95%.
4, present device adopts the method for overflow that water can be overflowed from adding alkali reaction pond, electric flocculation tank, tube settler successively, saves water pump, has saved energy consumption.
5, present device adds alkali reaction pond, electric flocculation tank and tube settler adopt one complete, and compact in design, good looking appearance is generous, is convenient to install and maintenance.
Accompanying drawing illustrates:
Fig. 1 is the process flow sheet of the present invention's electricity flocculation softening of water treatment process.
Fig. 2 is the front view of the present invention's electricity flocculation softening of water treatment facility.
Fig. 3 is the vertical view of the present invention's electricity flocculation softening of water treatment facility.
Fig. 4 is the side-view of the present invention's electricity flocculation softening of water treatment facility.
Description of symbols: 1-main body, 2-cat ladder, 3-main bracing frame, 4-relief outlet, 5-medium filter, 6-inhalent siphon, 7-inlet orifice, 8-aisle railing, 9-cat ladder handrail, 10-rising pipe, 11-adds alkali reaction pond, 12-electricity flocculation module, 13-aisle, 14-water leg, 15-tube settler, 16-electricity flocculation tank, 17-media filtration system, 18-dividing plate a, 19-dividing plate b, 20-dividing plate c.
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
embodiment 1
The inventive method and equipment is adopted to be 800ppm to hardness, volume is that the hard water of 100L processes, as shown in figs 2-4, the present embodiment equipment: comprise and add alkali reaction pond 11, electric flocculation tank 16, tube settler 15 and media filtration system 17, wherein add between alkali reaction pond 11 and electric flocculation tank 16 and have dividing plate a18, dividing plate b19 is had between electricity flocculation tank 16 and tube settler 15, add between alkali reaction pond 11 and tube settler 16 and have dividing plate c20, add alkali reaction pond 11, electric flocculation tank 16 and tube settler 15 one complete; Electricity flocculation module 12 is housed in electricity flocculation tank 16, water leg 14 is provided with above tube settler 15, the inhalent siphon 6 of media filtration system 17 is connected with water leg 14, also comprise and add alkali reaction pond 11, aisle 13 above main body 1 that electric flocculation tank 16 and tube settler 15 form, at the cat ladder 2 of main body 1 side.
The present embodiment method: (1), to be passed into by hard water and add in alkali reaction pond 11, then add the potassium hydroxide of 1.6mol and the salt of wormwood mixed precipitant by the mass mixing of 1:1 to adding alkali reaction pond 11, aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond 11 median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank 16 from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank 16 median water level raises gradually, the water containing macrobead thing in step 2 enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor enters in water leg 14 by overflow, then enters medium filter 5 by inhalent siphon 6, removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter 5 filtered enters into equalizing tank by rising pipe 10, and adding acid for adjusting pH value is enter intermediate pool after 8, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 30ppm; It can thus be appreciated that adopt the hard water hardness of aforesaid method process significantly to reduce, efficiency is high, effective.
embodiment 2
The inventive method and equipment is adopted to be 1000ppm to hardness, volume is that the hard water of 100L processes, as shown in figs 2-4, the present embodiment equipment: comprise and add alkali reaction pond 11, electric flocculation tank 16, tube settler 15 and media filtration system 17, wherein add between alkali reaction pond 11 and electric flocculation tank 16 and have dividing plate a18, dividing plate b19 is had between electricity flocculation tank 16 and tube settler 15, add between alkali reaction pond 11 and tube settler 16 and have dividing plate c20, add alkali reaction pond 11, electric flocculation tank 16 and tube settler 15 one complete; Electricity flocculation module 12 is housed in electricity flocculation tank 16, water leg 14 is provided with above tube settler 15, the inhalent siphon 6 of media filtration system 17 is connected with water leg 14, also comprise and add alkali reaction pond 11, aisle 13 above main body 1 that electric flocculation tank 16 and tube settler 15 form, at the cat ladder 2 of main body 1 side.
The present embodiment method:
(1), by hard water passing into adds in alkali reaction pond 11, and then add the sodium hydroxide of 2.0mol and the sodium carbonate mixed precipitant by the mass mixing of 2:1 to adding alkali reaction pond 11, aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond 11 median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank 16 from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank 16 median water level raises gradually, the water containing macrobead thing in step (2) enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor enters in water leg 14 by overflow, then enters medium filter 5 by inhalent siphon 6, removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter 5 filtered enters into equalizing tank by rising pipe 10, and adding acid for adjusting pH value is enter intermediate pool after 7, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 40ppm; It can thus be appreciated that adopt the hard water hardness of aforesaid method process significantly to reduce, efficiency is high, effective.
Contrast enforcement 1:
(1), by hard water passing into adds in alkali reaction pond 11, and then add the sodium hydroxide of 2.0mol and the sodium carbonate mixed precipitant by the mass mixing of 2:1 to adding alkali reaction pond 11, aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond 11 median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank 16 from dividing plate a overflow, does not make electricity consumption throwing out make suspended particulate become macrobead;
(3), along with electric flocculation tank 16 median water level raises gradually, the water of electric flocculation tank 16 enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor enters in water leg 14 by overflow, then enters medium filter 5 by inhalent siphon 6, removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter 5 filtered enters into equalizing tank by rising pipe 10, and adding acid for adjusting pH value is enter intermediate pool after 7, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 530ppm; It can thus be appreciated that lack electric flocculation treatment and have a great impact hard water softening tool, bating effect is poor.
Comparative example 2:
(1), by hard water pass into and add in alkali reaction pond 11, do not add mixed precipitant, but want aeration;
(2), along with adding alkali reaction pond 11 median water level raise gradually, the water adding alkali reaction pond 11 enters electric flocculation tank 16 from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank 16 median water level raises gradually, the water containing macrobead thing in step (2) enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor enters in water leg 14 by overflow, then enters medium filter 5 by inhalent siphon 6, removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter 5 filtered enters into equalizing tank by rising pipe 10, and adding acid for adjusting pH value is enter intermediate pool after 7, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 480ppm; It can thus be appreciated that, in hard water, do not add precipitation agent, have considerable influence to the sofening treatment of hard water, poor processing effect.
Comparative example 3:
(1), by hard water passing into adds in alkali reaction pond 11, and then add the sodium hydroxide of 2.0mol and the sodium carbonate mixed precipitant by the mass mixing of 2:1 to adding alkali reaction pond 11, aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond 11 median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank 16 from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank 16 median water level raises gradually, the water containing macrobead thing in step (2) enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor directly enters into equalizing tank, and adding acid for adjusting pH value is enter intermediate pool after 7, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 180ppm; It can thus be appreciated that, media filtration process is not carried out to supernatant liquor, have considerable influence to the sofening treatment of hard water, poor processing effect.
Comparative example 4:
(1), by hard water passing into adds in alkali reaction pond 11, simultaneously aeration;
(2), raise gradually along with adding alkali reaction pond 11 median water level, water in step (1) enters electric flocculation tank 16 from dividing plate a overflow, then in electric flocculation tank 16, add the sodium hydroxide of 2.0mol and the sodium carbonate mixed precipitant by the mass mixing of 2:1, and processed by electricity flocculation simultaneously;
(3), along with electric flocculation tank 16 median water level raises gradually, the water in step (2) enters tube settler 15 to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler 15 median water level raises gradually, supernatant liquor enters in water leg 14 by overflow, then enters medium filter 5 by inhalent siphon 6, removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter 5 filtered enters into equalizing tank by rising pipe 10, and adding acid for adjusting pH value is enter intermediate pool after 7, finally enters electrodialysis, obtains softening water.
The softening water obtained is crossed in the process of employing aforesaid method and carries out hardness determination, recording its hardness is 230ppm; It can thus be appreciated that precipitation agent adds when electric flocculation treatment, there is considerable influence to the sofening treatment of hard water, poor processing effect.
Can be found out by above-mentioned comparative example, the adding of precipitation agent, electric flocculation treatment, media filtration process are all indispensable technical essentials in water softening, be most important part in water softening treatment process, and order is also fixing, needs to cooperatively interact, acting in conjunction just can complete thoroughly softening hard water, indispensable, adopt the inventive method to carry out sofening treatment to hard water, effective, efficiency is high, wide adaptability.

Claims (10)

1. a treatment process for electricity flocculation softening of water, it is characterized in that, concrete steps are as follows:
(1), in the pending hard water added in alkali reaction pond add precipitation agent, aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), make to react with precipitation agent in step (1) after the water that obtains enter in electric flocculation tank, make suspended particulate become macrobead by electric throwing out;
(3), water that in step (2), electric flocculation treatment obtains is entered in tube settler to precipitate, obtain supernatant liquor;
(4), make the supernatant liquor obtained in step (3) enter media filtration system, remove suspended substance;
(5), make to filter in step (4) after water in equalizing tank by add acid for adjusting pH value laggard enter intermediate pool, finally enter electrodialysis, obtain softening water.
2., according to the treatment process of the electricity flocculation softening of water described in claim 1, it is characterized in that, described precipitation agent is alkali and the carbonate mixture of any mass ratio.
3. according to the treatment process of the electricity flocculation softening of water described in claim 2, it is characterized in that, described alkali is one or both in sodium hydroxide or potassium hydroxide, and described carbonate is one or both in sodium carbonate or salt of wormwood.
4., according to the treatment process of the electricity flocculation softening of water described in claim 1, it is characterized in that, described precipitation agent consumption is:
5(D/1×10 5)×V≥N≥(D/1×10 5)×V
Wherein N is the amount of substance that should add precipitation agent; D is the hardness value of pending hard water, unit ppm; V is the cumulative volume of pending hard water, unit L.
5. the treatment facility of an electricity flocculation softening of water, comprise main body (1) and media filtration system (17), it is characterized in that, described main body comprises and adds alkali reaction pond (11), electric flocculation tank (15) and tube settler (16), describedly add alkali reaction pond (11), electric flocculation tank (16) is communicated with successively with tube settler (15), makes hard water enter each reaction tank stepwise disposal successively.
6. according to the treatment facility of the electricity flocculation softening of water described in claim 5, it is characterized in that, , there is dividing plate a (18) described adding between alkali reaction pond (11) and electric flocculation tank (16), dividing plate b(19 is had) between described electric flocculation tank (16) and tube settler (15), , there is dividing plate c(20 described adding between alkali reaction pond (11) and tube settler (15)), described dividing plate c (20) is higher than dividing plate a (18), described dividing plate a (18) is higher than dividing plate b (19), described dividing plate b (19) is higher than water leg (14), make water can successively from adding alkali reaction pond (11), overflow in electricity flocculation tank (16) and tube settler (15).
7. according to the treatment facility of the electricity flocculation softening of water described in claim 6, it is characterized in that, described dividing plate c (20) is than dividing plate a(18) high 20-40cm, described dividing plate a (18) is than dividing plate b(19) high 10-20cm, described dividing plate b(19) 10-20cm higher than water leg (14), hard water is successively by adding alkali reaction pond (11), electric flocculation tank (16), tube settler (15) and media filtration system (17).
8. according to the treatment facility of the electricity flocculation softening of water described in claim 5, it is characterized in that, electricity flocculation module (12) is housed in described electric flocculation tank (16), described tube settler (15) top is provided with water leg (14), and described water leg (14) is connected with inhalent siphon (6).
9. according to the treatment facility of the electricity flocculation softening of water described in claim 5, it is characterized in that, described adding bottom alkali reaction pond (11), electric flocculation tank (16) and tube settler (15) is funnel-form, and hopper base is provided with relief outlet (4).
10. utilize the method for the treatment facility process hard water of electricity flocculation softening of water described in claim 5, it is characterized in that, concrete treatment process is:
(1), by pending hard water passing into adds in alkali reaction pond (11), then adds precipitation agent to adding alkali reaction pond (11), and aeration, makes the Ca in hard water simultaneously 2+, Mg 2+generate suspended particulate;
(2), along with adding alkali reaction pond (11) median water level raise gradually, the water containing suspended particulate in step (1) enters electric flocculation tank (16) from dividing plate a overflow, makes suspended particulate become macrobead by electric throwing out;
(3), along with electric flocculation tank (16) median water level raises gradually, the water containing macrobead thing in step (2) enters tube settler (15) to precipitate from dividing plate b overflow, obtains supernatant liquor;
(4), along with tube settler (15) median water level raises gradually, supernatant liquor enters in water leg (14) by overflow, then enters medium filter (5) by inhalent siphon (6), removes remaining suspended substance in supernatant liquor;
(5) supernatant liquor, through medium filter (5) filtered enters into equalizing tank by rising pipe (10), add acid for adjusting pH value laggard enter intermediate pool, finally enter electrodialysis, obtain softening water.
CN201511018333.8A 2015-12-29 2015-12-29 Processing method and equipment for softening hard water through electric flocculation Pending CN105417798A (en)

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