CN102849834A - Chemical reaction-precipitation integrated treatment method and chemical reaction-precipitation integrated treatment device - Google Patents

Chemical reaction-precipitation integrated treatment method and chemical reaction-precipitation integrated treatment device Download PDF

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CN102849834A
CN102849834A CN2012103917117A CN201210391711A CN102849834A CN 102849834 A CN102849834 A CN 102849834A CN 2012103917117 A CN2012103917117 A CN 2012103917117A CN 201210391711 A CN201210391711 A CN 201210391711A CN 102849834 A CN102849834 A CN 102849834A
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settling tank
tank
reaction
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reaction tank
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CN102849834B (en
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金锡标
王远
仇鑫耀
袁晓辰
徐宏勇
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East China University of Science and Technology
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East China University of Science and Technology
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Abstract

The invention discloses a chemical reaction-precipitation integrated treatment device and a chemical reaction-precipitation integrated treatment method. The treatment device comprises a reaction tank and a sedimentation tank which are sheathed in a concentric way; the reaction tank and the sedimentation tank respectively have a tube structure, and the two tube structures are communicated with each other; the reaction tank is an outer tube; a water outlet groove is formed at an opening of the tube of the sedimentation tank; the water outlet groove and the sedimentation tank are arranged in a concentric way; the opening of the water outlet groove is lower than that of the tube of the sedimentation tank; and the bottom of the reaction tank is fixedly connected with a propeller. The method comprises the following steps of: putting a mixed solution of waste water to be treated, a softening agent, a coagulant and coagulant aids into the reaction tank for reaction; and adding the mixed solution into the sedimentation tank, precipitating and discharging clear liquid through the water outlet groove. The treatment device and the treatment method are suitable for waste water with high hardness as well as high concentration phosphorus and fluorine, and are high in treatment load and strong in shock resistance; and the invention is high in efficiency, stable in effluent, low in energy consumption and high in solid content of concentrated sludge, can be directly used for sludge dewatering, and is small in occupied land.

Description

A kind of chemical reaction-precipitation integral treatment process and treatment unit
Technical field
The present invention relates to a kind of chemical reaction-precipitation integral treatment process and treatment unit.
Background technology
Traditional accelerator is to utilize churned mechanically castering action to finish the reflux course of mixing, contact reacts and mud.Former water after the dosing enters the first reaction chamber, react under the stirring of impeller with the mixed solution of volume times over former water, castering action by impeller enters the second reaction chamber continuation reaction, forms larger mud flco, enters the separate chamber by conduction pipe again and carries out solid-liquid separation.This device unit surface producing water ratio is larger, is fit to the water quality of higher concentration, but also has problems: (1) complex structure, construction, installation, maintenance difficulty; (2) use small scale; (3) reaction time is short, treatment effect less stable, the inadaptable slower systems of crystal growth speed such as softening, dephosphorization, defluorination; (4) almost without the mud concentrating function, need supporting mud concentration systems.
The technical name of Densadeg(the said firm exploitation of France Degremont S.A exploitation, without corresponding Chinese annotation) treatment technology, comprise two parts of reaction zone and precipitation-enrichment region, former water enters reaction zone, the quick coagulation of elder generation's dosing stirs, after at a slow speed plug-flow proceed coagulating, form larger mud flco, enter the ramp type settling tank and carry out solid-liquid separation, in establish mud scraper and sludge refluxing apparatus; The part sludge reflux continues to participate in reaction to reaction tank.This technology tradition clarification (precipitation) technology can effectively reduce and covers an area of 50%, reduce added amount of chemical 10 ~ 30%, the enrichment region sludge concentration can reach 30-550g/L, processing efficiency is higher, anti impulsion load is strong, but still have some problems: the capacity limitation of (1) reaction zone the scale of this system, use small scale; (2) head loss of reaction zone is larger; (3) scrape/suction dredger power transposition is under water fully, and the equipment waterproof requirement is high, and expense is large.
The technical name of this French company's exploitation of the Actiflo(of France Veolia company exploitation is without corresponding Chinese annotation) treatment technology is made of coagulation basin, reaction tank, aerobic fermentation tank and inclined-plate clarifying basin.This technique improves mud flco density, and then improves its settling velocity by adds little sand (100-150 μ m) crystal seed in reaction tank, shortens the residence time, has improved processing efficiency.Little sand is by sludge refluxing apparatus and the recycle of silt particle tripping device.Softening and total tp removal rate is more than 90%, and the settling tank surface load reaches 60 ~ 80m/h.Its existing defective is: the reaction chamber of (1) system is more, and is when flco flows in each reaction chamber, easily impaired; (2) silt particle tripping device energy consumption is large; (3) system's head loss is large, and treatment scale is little, and cost is high.
The technical name of this French company's exploitation of the CONTRAFAST(of Siemens exploitation is without corresponding Chinese annotation) integrated technique, comprise central draft tube and reaction zone, sloping plate deposition district.Water inlet rapid reaction under the effect of stirrer in center enters the settling region by guide shell, realizes solid-liquid separation in inclined-plate clarifying basin, and mud scraper is established in the bottom, pond, collects thickened sludge, and is back to the central reaction district with 10 times of volumes to water inlet.Surface load 15 ~ 25m/h, the mud solid content is greater than 20%.But equipment is installed and maintenance is complicated, outer shroud ramp type settling tank, and deposition efficiency is low, and treatment scale is little and stable not.
The traditional mechanical settling pond of above introduction and three kinds of follow-on reaction settling ponds, ubiquity complex structure, and cost is higher, and the processing volume load is less, and water outlet is stable not, inorganics or the lower defective of hardness clearance.For industrial high rigidity, high concentration phosphorus, fluorine waste water and the band factory effluent such as be corrosive, these clarifying equipments or technology there is not yet the application example report.At present, this phenomenon needs to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing reaction settling pond complex structure, cost is higher, the processing volume load is less, water outlet is stable not, inorganics or the lower defective of hardness clearance provide a kind of new chemical reaction-precipitation integral treatment unit and chemical reaction-precipitation integral treatment process.This treatment unit and method are applicable to high rigidity, high phosphorus, high fluorine waste water, process load high, strong shock resistance; Removal efficient is high, stable water outlet; Energy consumption is low; The thickened sludge solid content is high, can directly carry out sludge dewatering, and takes up an area few.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind for the treatment of unit of chemical reaction-precipitation integral; Its characteristics are, it comprises a with one heart sheathed reaction tank and a settling tank, and described reaction tank is the tube structure that is connected with settling tank, and described reaction tank is outer cylinder body; The tube port position of described settling tank is formed with one and is used for collecting and discharging the effluent trough of the annular of clear liquid, and described effluent trough arranges with described settling tank is concentric, and the notch of described effluent trough is lower than the nozzle of described settling tank; The bottom of described reaction tank is installed with one and is used for promoting the thruster that mixed solution flows at reaction tank.
Better, the outer wall of described reaction tank connects a water inlet pipe, and the outer wall of described effluent trough connects a rising pipe; Better, described water inlet pipe is positioned at described reaction tank outer wall bottom, apart from the bottom 0.5m of described reaction tank.
Better, it is mobile with the speed of mean flow rate 0.1m/s-0.6m/s that described thruster promotes mixed solution.
Better, described reaction tank inner fluid is the spiral type fluidised form.
Better, described settling tank is circumferential water feed peripheral effluent structure; Be formed with a cloth waterwall on the barrel of described settling tank; The position of described cloth waterwall is lower than the bottom land of described effluent trough; Better, described cloth waterwall is positioned at the top of described settling tank; Better, described cloth waterwall is provided with some limbers; Better, each described limbers is horizontally disposed on described cloth waterwall, further better equally spacedly, and the spacing of two adjacent described limbers is 0.5m-2.0m.
Better, also be provided with a circle flow deflector in the described settling tank, described flow deflector is fixed on the outer wall of the nearly center of circle one side of described effluent trough; Better, the height of described flow deflector is the 1/3-2/3 of the barrel height of described settling tank, better is 1/2;
Better, also being provided with one in the described settling tank and being used for making the uniform weir plate of water outlet, described weir plate is fixed in the notch of described effluent trough; Better, described weir plate is leg-of-mutton weir plate.
Better, being provided with one in the described settling tank and scraping/suction dredger, the bottom of described settling tank is provided with a sludge hopper; Better, described sludge hopper connects a pump with the extraction of the mud in the described sludge hopper, or described sludge hopper connects an air lift device that is used for the mud discharge; Described pump or air lift device connect two pipelines, and a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank, and another root pipeline connection one is used for the bogey of carrying mud.
In addition, the present invention also provides a kind for the treatment of unit that adopts above-mentioned chemical reaction-precipitation integral to carry out the method that chemical reaction-precipitation integral is processed, and its characteristics are, it may further comprise the steps:
S1, pending waste water with one or more the mixed solution in tenderizer, coagulating agent and the coagulant aids, enter described reaction tank reaction, the described mixed solution helically fluidised form in the described reaction tank;
S2, reacted mixed solution enter precipitation in the described settling tank, and the clear liquid that obtains is after precipitation discharged through described effluent trough.
Better, when the outer wall of the reaction tank for the treatment of unit connects a water inlet pipe, when the outer wall of described effluent trough connects a rising pipe; Wherein,
Step S1 also comprises step S11: described mixed solution enters described reaction tank through a described water inlet pipe; Described thruster promotes mixed solution and flows in reaction tank;
Step S2 also comprises step S21: described clear liquid is discharged through described effluent trough and described rising pipe successively.
Better, on the barrel of described settling tank, being formed with a cloth waterwall, described cloth waterwall is provided with some limbers; Also be provided with a circle flow deflector in the described settling tank, described flow deflector is fixed on the outer wall of the nearly center of circle one side of described effluent trough; Also be provided with one in the described settling tank and be used for making the uniform weir plate of water outlet, when described weir plate is fixed in the notch of described effluent trough;
In step S2, described settling tank is injected in the limbers of described mixed solution on described cloth waterwall, and through described flow deflector, flows in the described settling tank; Described mixed solution is solid-liquid separation in described settling tank, and described clear liquid flows in the described effluent trough through described weir plate.
Better, in described settling tank, being provided with one and scraping/suction dredger, the bottom of described settling tank is provided with a sludge hopper; Described sludge hopper connects a pump with the extraction of the mud in the described sludge hopper, or described sludge hopper connects an air lift device that is used for the mud discharge; Described pump or air lift device connect two pipelines, and a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank, when another root pipeline connection one is used for the bogey of carrying mud; The further comprising the steps of S3 of described method:
Described mixed solution is solid-liquid separation in described settling tank, and the mud in the described settling tank accumulates in the described sludge hopper under the effect of described scraping/suction dredger; Mud in the described bogey is discharged, the sludge reflux in the described reflux; Better, the reflux ratio of the mud of described discharge system is 0.1-1.0.
The water quality of the water inlet in the described reaction tank is: hardness is that 250-1000mg/L, phosphate ion concentration are that 2-50mg/L, fluorinion concentration are 100-500mg/L;
Better, described tenderizer dosage is with CaCO 3Count 1.0-1.5g/g hardness;
Better, described coagulating agent is for poly-aluminium coagulating agent and/or contain calcon, and is better, and when content during at 2-10mg/L, the addition of described poly-aluminium coagulating agent is counted 10-20mg/L with phosphorus; When phosphorus content during at 10-50mg/L, the addition of described poly-aluminium coagulating agent is counted 1.2g/g phosphorus with phosphorus; Better, the described addition that contains calcon is counted the 1.2-1.5g/g fluorine with Ca;
The dosage of coagulating agent is 10-50mg/L; The dosage of coagulant aids is 1-5mg/L; The concentration of the mixed solution in the described reaction tank is 20-40g/L.
Among the present invention, reaction tank is annular configuration, and current form secondary circulation in the transverse section, and angle of rake use under the hydrous water forms whole spiral type fluidised form.It is because fluid in the process of bend motion, exists the phenomenon on ground in the outer height of the water surface that the helical flow fluidised form produces reason.By force analysis as can be known: from the water bottom to the water surface, exist 2 reactive forces on the vertical: 1, from top to bottom, keep constant pressure difference, direction is pointed to the center of circle; 2, from top to bottom, from 0(because pond base plate vicinity speed is 0) rise to ρ u 2/ r, direction deviates from the center of circle.Therefore, pressure when the bottom〉centrifugal force, resultant direction is pointed to the center of circle; Reach a certain stagnation point, pressure=centrifugal force; Make progress again, pressure<centrifugal force, resultant direction deviates from the center of circle.Force action is in fluid, therefore formed the spiral fluidised form.This special fluidised form is fully mixed reactant, increases the effective collision between the reactant, and can reduce the partial over saturation degree, promotes the fine grain growth of precipitation; The mobile distance of spiral fluidised form accretion matter prolongs the reaction times.
Water inlet pipe advances the water (flow) direction of " bottom in and top out " that the limbers goes out in the reaction tank, takes full advantage of the kinetic energy into water, saves angle of rake energy consumption, and has avoided the generation of short stream.Well blend effect in the reaction tank is evenly distributed the water yield, the sludge concentration that enter settling tank, and each water-in sludge concentration is basically identical, processes load around the settling tank basic identical, the settling efficiency maximization.
By angle of rake output rating, adjust the mixture strength in the reaction tank, make the interior mud of reaction tank totally be the upper strata sludge concentration low, vertical sludge concentration that middle lower floor concentration is high distributes.On the one hand, under well-mixed prerequisite, it is large that the precipitation fine particle particle diameter that reaction generates becomes, and density rises, and settling property improves; Thruster optimization output power is on the other hand kept this up and down concentration difference, has both avoided producing the mud alluvial, has also reduced the sludge quantity that enters settling tank, has reduced the solid flux of settling tank in guaranteeing reaction tank in than high sludge concentration.The mud of high density, the throw out that forms for reaction provides attachment site and growing carrier, increased the fine grain particle diameter of precipitation, subsidence rate also is improved, this has not only guaranteed the sludge concentration in the reaction tank, also shorten simultaneously the residence time of the mud in the settling tank, obtained the effect of rapid subsidence.
Thickened sludge in the sludge hopper is back to reaction tank by a certain percentage, has kept the sludge concentration in the reaction tank, for the crystal in the reaction tank provides the growth site, promotes the carrying out of chemical precipitation reaction, has improved the reaction treatment degree of depth, has guaranteed effluent quality; Increase simultaneously the fine grain particle diameter of precipitation, improved its subsidence rate in settling tank.
Initial reaction stage, the mud flco is less, and the throw out of generation is main mainly with becoming nuclear reaction, and the speed of growth is slow.The means of the preferred sludge reflux of present technique, the mud that refluxes provides attachment site and growing carrier for the throw out that reaction forms, and the volume that takes full advantage of flocculation agent is swept, absorption, bridging action, has increased the fine grain particle diameter of precipitation, and subsidence rate also is improved.
On the basis that meets this area general knowledge, above-mentioned each optimum condition, but arbitrary combination namely get the preferred embodiments of the invention.
Agents useful for same of the present invention and raw material be commercially available getting all.
Positive progressive effect of the present invention is:
1, is applicable to high rigidity, high phosphorus, high fluorine trade effluent, processes load high, strong shock resistance;
2, removal efficient is high, and stable water outlet is up to standard;
3, energy consumption is low, and ton water power consumption is at 0.007-0.012kWh;
4, the thickened sludge solid content is high, can directly carry out sludge dewatering;
5, reaction tank and settling tank are built together, and save soil and capital cost;
6, simple in structure, convenient construction and maintenance, maintenance cost is low.
Description of drawings
Fig. 1 is the vertical view of the treatment unit of chemical reaction-precipitation integral of the present invention.
Fig. 2 is along the sectional view of A-A line among Fig. 1.
Embodiment
Mode below by embodiment further specifies the present invention, but does not therefore limit the present invention among the described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example according to ordinary method and condition, or is selected according to catalogue.
Embodiment 1
The high rigidity wastewater treatment of coal chemical industry enterprises discharging
As depicted in figs. 1 and 2, the treatment unit of chemical reaction-precipitation integral of the present invention (hereinafter to be referred as treatment unit):
Comprise a with one heart sheathed reaction tank 2 and a settling tank 6, reaction tank 2 and the tube structure of settling tank 6 for being connected, described reaction tank 2 is outer cylinder body; The tube port position of settling tank 6 is formed with one and is used for collecting and discharging the effluent trough 8 of the annular of clear liquid, effluent trough 8 and settling tank 6 concentric settings, and the notch of effluent trough 8 is lower than the nozzle of settling tank 6; The bottom of reaction tank 2 is installed with one and is used for promoting the thruster 3 that mixed solution flows at reaction tank 2.The outer wall of reaction tank 2 connects a water inlet pipe 1, and the outer wall of effluent trough 8 connects a rising pipe 9.Settling tank 6 is circumferential water feed peripheral effluent structure; Be formed with a cloth waterwall 4 on the barrel of settling tank 6; The position of cloth waterwall 4 is lower than the bottom land of described effluent trough 8; Cloth waterwall 4 is positioned at the top of settling tank 6; Cloth waterwall 4 is provided with some limbers; Each limbers is horizontally disposed on described cloth waterwall 4 equally spacedly, and the spacing of two adjacent limbers is 0.5m-2.0m.Also be provided with circle water conservancy diversion 5 plates in the settling tank 6, flow deflector 5 is fixed on the outer wall of the nearly center of circle one side of effluent trough 8; The height of flow deflector 5 be described settling tank 6 the barrel height 1/3; Also be provided with one in the settling tank 6 and be used for making the uniform weir plate 11 of water outlet, weir plate 11 is fixed in the notch of effluent trough 8; Weir plate 11 is leg-of-mutton weir plate.Be provided with one in the settling tank 6 and scrape/suction dredger 7, the bottom of settling tank 6 is provided with a sludge hopper 10; Sludge hopper 10 connects a pump with the extraction of the mud in the described sludge hopper, described pump connects two pipelines, a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank 2, and another root pipeline connects a bogey for carrying mud.
Wherein, the diameter of settling tank 6 is 20m, and the width of reaction tank 2 is 5m, highly is 6.5m, the power of motor 2.0kW of thruster 3.
The method that chemical reaction-precipitation integral is processed:
(1), pending waste water, one or more the mixed solution with in tenderizer, coagulating agent and the coagulant aids enters reaction tank 2 through a described water inlet pipe 1, thruster 3 promotes mixed solutions and flows in reaction tank 2; Mixed solution helically fluidised form in the reaction tank 2; The mean flow rate of mixed solution is 0.3m/s;
(2), reacted mixed solution, the some limbers through cloth waterwall 4 is provided with enter settling tank 6, enter in the settling tank 6 through flow deflector 5;
(3) mixed solution solid-liquid separation in settling tank 6, the mud in the settling tank 6 scraping/effect of suction dredger 7 under, accumulate in the sludge hopper 10, clear liquid flows to described effluent trough 8 through weir plate 11;
(4) clear liquid in the effluent trough 8 behind the inflow effluent trough 8, is discharged through described rising pipe 9;
(5) mud accumulates in the sludge hopper 10, and sludge part is discharged, and is partly refluxed to reaction tank 2, and the reflux ratio in the discharge system is 0.1-1.0.
Wastewater source and index thereof:
The chemical plant, Shandong Province produces product and relates generally to synthetic ammonia, urea etc.
10000 tons of day discharging factory effluents, total hardness is (with CaCO 3Meter) mean value is 500mg/L.The water yield 10000t/d of actual water inlet, the water inlet total hardness is (with CaCO 3Meter) be 450-550mg/L, the tenderizer dosage is 0.5-0.6g/L, and coagulant charging quantity is 10-20mg/L, and polymer coagulant aids dosage is 1-2mg/L.
For avoiding the fouling of system pipeline, this waste water must be removed hardness before entering biochemical system.Reaction-precipitation integral technology has been adopted in design, namely by the reaction of the chemical precipitation in the reaction tank, changes calcium ions and magnesium ions into calcium carbonate, magnesiumcarbonate crystal or flco material, again through the solid-liquid separation of settling tank, reaches the purpose of removing the calcium magnesium hardness.
The advantage that reaction-precipitation integral technology embodies a concentrated reflection of out in this project is: be applicable to the trade effluent of high rigidity, and still can keep higher clearance, reach more than 80%; Added amount of chemical is little, and working cost is low, and the ton water power consumes approximately 0.010kWh.Go out total hardness of water (with CaCO 3Meter) be 80-100mg/L, clearance reaches 80%.
Embodiment 2
The municipal wastewater treatment plant treatment of Phosphorus Containing Waste Water
As depicted in figs. 1 and 2, the treatment unit of chemical reaction-precipitation integral of the present invention (hereinafter to be referred as treatment unit):
Comprise a with one heart sheathed reaction tank 2 and a settling tank 6, reaction tank 2 and the tube structure of settling tank 6 for being connected, described reaction tank 2 is outer cylinder body; The tube port position of settling tank 6 is formed with one and is used for collecting and discharging the effluent trough 8 of the annular of clear liquid, effluent trough 8 and settling tank 6 concentric settings, and the notch of effluent trough 8 is lower than the nozzle of settling tank 6; The bottom of reaction tank 2 is installed with one and is used for promoting the thruster 3 that mixed solution flows at reaction tank 2.The outer wall of reaction tank 2 connects a water inlet pipe 1, and the outer wall of effluent trough 8 connects a rising pipe 9.Settling tank 6 is circumferential water feed peripheral effluent structure; Be formed with a cloth waterwall 4 on the barrel of settling tank 6; The position of cloth waterwall 4 is lower than the bottom land of described effluent trough 8; Cloth waterwall 4 is positioned at the top of settling tank 6; Cloth waterwall 4 is provided with some limbers; Each limbers is horizontally disposed on described cloth waterwall 4 equally spacedly, and the spacing of two adjacent limbers is 0.5m-2.0m.Also be provided with circle water conservancy diversion 5 plates in the settling tank 6, flow deflector 5 is fixed on the outer wall of the nearly center of circle one side of effluent trough 8; The height of flow deflector 5 be described settling tank 6 the barrel height 1/2; Also be provided with one in the settling tank 6 and be used for making the uniform weir plate 11 of water outlet, weir plate 11 is fixed in the notch of effluent trough 8; Weir plate 11 is leg-of-mutton weir plate.Be provided with one in the settling tank 6 and scrape/suction dredger 7, the bottom of settling tank 6 is provided with a sludge hopper 10; Sludge hopper 10 connects a pump with the extraction of the mud in the described sludge hopper, described pump connects two pipelines, a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank 2, and another root pipeline connects a bogey for carrying mud.
Wherein, the diameter 20m of settling tank 6, the annulus width of reaction tank 2 is 6m, highly is 6.5m, the power of motor 3.1kW of thruster 3.
The method that chemical reaction-precipitation integral is processed:
(1), pending waste water, one or more the mixed solution with in tenderizer, coagulating agent and the coagulant aids enters reaction tank 2 through a described water inlet pipe 1, thruster 3 promotes mixed solutions and flows in reaction tank 2; Mixed solution helically fluidised form in the reaction tank 2; The mean flow rate of mixed solution is 0.6m/s;
(2), reacted mixed solution, the some limbers through cloth waterwall 4 is provided with enter settling tank 6, enter in the settling tank 6 through flow deflector 5;
(3) mixed solution solid-liquid separation in settling tank 6, the mud in the settling tank 6 scraping/effect of suction dredger 7 under, accumulate in the sludge hopper 10, clear liquid flows to described effluent trough 8 through weir plate 11;
(4) clear liquid in the effluent trough 8 behind the inflow effluent trough 8, is discharged through described rising pipe 9;
(5) mud accumulates in the sludge hopper 10, and sludge part is discharged, and is partly refluxed to reaction tank 2, and the reflux ratio in the discharge system is 0.1-1.0.
Wastewater source and index thereof:
Certain municipal sewage plant, day output is 5 ten thousand steres, contains a certain proportion of industrial sewage, bio-chemical effluent phosphorus severe overweight, total phosphorous are 5-10mg/L.The water yield 45000-52000t/d of actual water inlet, water inlet total phosphorus (take phosphorus) is 2-3mg/L, SS=20mg/L, COD=40-50mg/L.Poly-aluminium coagulant charging quantity is 10-20mg/L, and polymer coagulant aids dosage is 1-2mg/L.
For realizing qualified discharge, behind secondary biochemical effluent, adopt reaction-precipitation integral technology to carry out chemical dephosphorization, by adding poly-aluminium or Polyferric Sulfate class coagulating agent, make the phosphate radical of ionic state or phosphoric acid one hydrogen root, dihydrogen phosphate change aluminum phosphate or tertiary iron phosphate throw out into, reach solid-liquid separation through settling tank again, reach the dephosphorization purpose.This integrated technique can adapt to big yield, and it is 2.5 ten thousand tons that single seat day is processed the water yield; The settling tank surface load is high; Clearance is high, reaches more than 90%; System's treatment effect is stable, water outlet PO 4 3-(take phosphorus) is 0.1-0.3mg/L, and total phosphorus is less than 0.3mg/L, qualified discharge.
Embodiment 3
High fluorine wastewater treatment
As depicted in figs. 1 and 2, the treatment unit of chemical reaction-precipitation integral of the present invention (hereinafter to be referred as treatment unit):
Comprise a with one heart sheathed reaction tank 2 and a settling tank 6, reaction tank 2 and the tube structure of settling tank 6 for being connected, described reaction tank 2 is outer cylinder body; The tube port position of settling tank 6 is formed with one and is used for collecting and discharging the effluent trough 8 of the annular of clear liquid, effluent trough 8 and settling tank 6 concentric settings, and the notch of effluent trough 8 is lower than the nozzle of settling tank 6; The bottom of reaction tank 2 is installed with one and is used for promoting the thruster 3 that mixed solution flows at reaction tank 2.The outer wall of reaction tank 2 connects a water inlet pipe 1, and the outer wall of effluent trough 8 connects a rising pipe 9.Settling tank 6 is circumferential water feed peripheral effluent structure; Be formed with a cloth waterwall 4 on the barrel of settling tank 6; The position of cloth waterwall 4 is lower than the bottom land of described effluent trough 8; Cloth waterwall 4 is positioned at the top of settling tank 6; Cloth waterwall 4 is provided with some limbers; Each limbers is horizontally disposed on described cloth waterwall 4 equally spacedly, and the spacing of two adjacent limbers is 0.5m-2.0m.Also be provided with circle water conservancy diversion 5 plates in the settling tank 6, flow deflector 5 is fixed on the outer wall of the nearly center of circle one side of effluent trough 8; The height of flow deflector 5 be described settling tank 6 the barrel height 2/3; Also be provided with one in the settling tank 6 and be used for making the uniform weir plate 11 of water outlet, weir plate 11 is fixed in the notch of effluent trough 8; Weir plate 11 is leg-of-mutton weir plate.Be provided with one in the settling tank 6 and scrape/suction dredger 7, the bottom of settling tank 6 is provided with a sludge hopper 10; Sludge hopper 10 connects an air lift device that is used for the mud discharge; Described air lift device connects two pipelines, and a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank 2, and another root pipeline connection one is used for the bogey of carrying mud.Wherein, the diameter of settling tank 6 is 9m, and the width of reaction tank 2 is 3m, highly is 6m, and the power of motor of thruster 3 is 1.0kW.
The method that chemical reaction-precipitation integral is processed:
(1), pending waste water, one or more the mixed solution with in tenderizer, coagulating agent and the coagulant aids enters reaction tank 2 through a described water inlet pipe 1, thruster 3 promotes mixed solutions and flows in reaction tank 2; Mixed solution helically fluidised form in the reaction tank 2; The mean flow rate of mixed solution is 0.1m/s;
(2), reacted mixed solution, the some limbers through cloth waterwall 4 is provided with enter settling tank 6, enter in the settling tank 6 through flow deflector 5;
(3) mixed solution solid-liquid separation in settling tank 6, the mud in the settling tank 6 scraping/effect of suction dredger 7 under, accumulate in the sludge hopper 10, clear liquid flows to described effluent trough 8 through weir plate 11;
(4) clear liquid in the effluent trough 8 behind the inflow effluent trough 8, is discharged through described rising pipe 9;
(5) mud accumulates in the sludge hopper 10, and sludge part is discharged, and is partly refluxed to reaction tank 2, and the reflux ratio in the discharge system is 0.1-1.0.
Wastewater source and index thereof:
Shandong factory is in acid treatment and the high fluorine waste water of passivation workshop section output, peak F -Concentration is up to 300mg/L, and system moves 1 year, the water yield 4000-6000t/d of actual water inlet, residence time 10h, water inlet F -Concentration is 150-300mg/L, and the calcium chloride dosage is 200-450mg/L, and coagulant charging quantity is 10-20mg/L, and the polymeric flocculant dosage is 1-2mg/L.
Before the waste water of this section generation enters Waste Water Treatment, need to carry out the pre-treatment defluorination to it.This factory adopts reaction-precipitation integral technology, and by adding calcium chloride, mixture carries out the chemical precipitation reaction in reaction tank, generate Calcium Fluoride (Fluorspan), passes through the settling tank solid-liquid separation again, realizes the removal of fluorion.
Water outlet F -Concentration is 4-6mg/L, and clearance reaches more than 95%, and a whole set of integrated technique corrosion resistance is strong, processes stable effluent quality up to standard, and clearance is large more than 95%; Floor space is little, and capital cost is low; Stable, ton water power consumption 0.010-0.012kWh.
Comparative Examples 1
Certain Circulating Cooling Water of Power Plant is used traditional accelerator and is softened processing.Single seat settling pond processing power is 4000t/ days, raw water quality: hardness 650mg/L, and basicity 7.3mmol/L, pH are 9.Effluent index: hardness 280-350mg/L, turbidity 2-3NTU.Processing efficiency is well below method right described in the present invention; The processing power of single seat device also only has 40% of device of the present invention.Because this Circulating Cooling Water of Power Plant water quality requirement is higher, also increased a clarification pond and a cover microfiltration systems in the technique, but low burden and the working cost that has greatly increased subsequent process of softening installation efficient.

Claims (10)

1. the treatment unit of a chemical reaction-precipitation integral is characterized in that: it comprises a with one heart sheathed reaction tank and a settling tank, and described reaction tank is the tube structure that is connected with settling tank, and described reaction tank is outer cylinder body; The tube port position of described settling tank is formed with one and is used for collecting and discharging the effluent trough of the annular of clear liquid, and described effluent trough arranges with described settling tank is concentric, and the notch of described effluent trough is lower than the nozzle of described settling tank; The bottom of described reaction tank is installed with one and is used for promoting the thruster that mixed solution flows at reaction tank.
2. treatment unit as claimed in claim 1, it is characterized in that: the outer wall of described reaction tank connects a water inlet pipe, and the outer wall of described effluent trough connects a rising pipe;
Better, described water inlet pipe is positioned at described reaction tank outer wall bottom, apart from the bottom 0.5m of described reaction tank;
Better, it is mobile with the speed of mean flow rate 0.1m/s-0.6m/s that described thruster promotes mixed solution;
Better, described reaction tank inner fluid is the spiral type fluidised form.
3. treatment unit as claimed in claim 1 is characterized in that: described settling tank is circumferential water feed peripheral effluent structure; Be formed with a cloth waterwall on the barrel of described settling tank; The position of described cloth waterwall is lower than the bottom land of described effluent trough; Better, described cloth waterwall is positioned at the top of described settling tank; Better, described cloth waterwall is provided with some limbers; Better, each described limbers is horizontally disposed on described cloth waterwall, further better equally spacedly, and the spacing of two adjacent described limbers is 0.5m-2.0m.
4. treatment unit as claimed in claim 1 is characterized in that: also be provided with a circle flow deflector in the described settling tank, described flow deflector is fixed on the outer wall of the nearly center of circle one side of described effluent trough; Better, the height of described flow deflector is the 1/3-2/3 of the barrel height of described settling tank, better is 1/2;
Better, also being provided with one in the described settling tank and being used for making the uniform weir plate of water outlet, described weir plate is fixed in the notch of described effluent trough; Better, described weir plate is leg-of-mutton weir plate.
5. such as each described treatment unit of claim 1 to 4, it is characterized in that: be provided with one in the described settling tank and scrape/suction dredger, the bottom of described settling tank is provided with a sludge hopper; Better, described sludge hopper connects a pump with the extraction of the mud in the described sludge hopper, or described sludge hopper connects an air lift device that is used for the mud discharge; Described pump or air lift device connect two pipelines, and a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank, and another root pipeline connection one is used for the bogey of carrying mud.
6. one kind is adopted treatment unit as claimed in claim 1 to carry out the method that chemical reaction-precipitation integral is processed, and its characteristics are, it may further comprise the steps:
S1, pending waste water with one or more the mixed solution in tenderizer, coagulating agent and the coagulant aids, enter described reaction tank reaction, the described mixed solution helically fluidised form in the described reaction tank;
S2, reacted mixed solution enter precipitation in the described settling tank, and the clear liquid that obtains is after precipitation discharged through described effluent trough.
7. method as claimed in claim 6, it is characterized in that: the outer wall of the reaction tank of this treatment unit connects a water inlet pipe, and the outer wall of described effluent trough connects a rising pipe; Wherein,
Step S1 also comprises step S11: described mixed solution enters described reaction tank through a described water inlet pipe; Described thruster promotes mixed solution and flows in reaction tank;
Step S2 also comprises step S21: described clear liquid is discharged through described effluent trough and described rising pipe successively.
8. method as claimed in claim 7, it is characterized in that: be formed with a cloth waterwall on the barrel of described settling tank, the position of described cloth waterwall is lower than the bottom land of described effluent trough; Described cloth waterwall is positioned at the top of described settling tank; Described cloth waterwall is provided with some limbers; Also be provided with a circle flow deflector in the described settling tank, described flow deflector is fixed on the outer wall of the nearly center of circle one side of described effluent trough; Also be provided with one in the described settling tank and be used for making the uniform weir plate of water outlet, described weir plate is fixed in the notch of described effluent trough;
In step S2, described settling tank is injected in the limbers of described mixed solution on described cloth waterwall, and through described flow deflector, flows in the described settling tank; Described mixed solution is solid-liquid separation in described settling tank, and described clear liquid flows in the described effluent trough through described weir plate.
9. method as claimed in claim 6, it is characterized in that: be provided with one in the described settling tank and scrape/suction dredger, the bottom of described settling tank is provided with a sludge hopper; Described sludge hopper connects a pump with the extraction of the mud in the described sludge hopper, or described sludge hopper connects an air lift device that is used for the mud discharge; Described pump or air lift device connect two pipelines, and a pipeline connects one and is used for the reflux of sludge reflux to described coagulation reaction tank, and another root pipeline connection one is used for the bogey of carrying mud; The further comprising the steps of S3 of described method:
Described mixed solution is solid-liquid separation in described settling tank, and the mud in the described settling tank accumulates in the described sludge hopper under the effect of described scraping/suction dredger; Mud in the described bogey is discharged, the sludge reflux in the described reflux; Better, the reflux ratio of the mud of described discharge system is 0.1-1.0.
10. method as claimed in claim 6, it is characterized in that: the water quality of the water inlet in the described reaction tank is: hardness is that 250-1000mg/L, phosphate ion concentration are that 2-50mg/L, fluorinion concentration are 100-500mg/L;
Better, described tenderizer dosage is with CaCO 3Count 1.0-1.5g/g hardness;
Better, described coagulating agent is for poly-aluminium coagulating agent and/or contain calcon, and is better, and when phosphorus content during at 2-10mg/L, the addition of described poly-aluminium coagulating agent is counted 10-20mg/L with P; When phosphorus content during at 10-50mg/L, the addition of described poly-aluminium coagulating agent is counted 1.2g/g phosphorus with P; Better, the described addition that contains calcon is counted the 1.2-1.5g/g fluorine with Ca;
The dosage of coagulating agent is 10-50mg/L; The dosage of coagulant aids is 1-5mg/L; The concentration of the mixed solution in the described reaction tank is 20-40g/L.
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CN105439291A (en) * 2015-11-20 2016-03-30 西安建筑科技大学 Biological method for removing temporary hardness of underground water
CN109574321A (en) * 2019-01-14 2019-04-05 华东理工大学 Oil-mud-water three-phase integratedization separator and separation method

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