CN105540939A - Device and method for removing calcium, magnesium, fluorine and silicon elements in wastewater - Google Patents
Device and method for removing calcium, magnesium, fluorine and silicon elements in wastewater Download PDFInfo
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- CN105540939A CN105540939A CN201610144977.XA CN201610144977A CN105540939A CN 105540939 A CN105540939 A CN 105540939A CN 201610144977 A CN201610144977 A CN 201610144977A CN 105540939 A CN105540939 A CN 105540939A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention provides a device and a method for removing calcium, magnesium, fluorine and silicon elements in wastewater. The device comprises a first reactor, a first separator, a second reactor and a second separator which are sequentially connected. The device for removing the calcium, magnesium, fluorine and silicon elements in the wastewater has the advantages of simple structure, high treatment efficiency, good effluent effect, capability of effectively removing the calcium, magnesium, fluorine and silicon elements in the wastewater simultaneously and facilitating follow-up comprehensive utilization of the wastewater and the like. The method is simple in process, short in treatment time, capable of effectively removing the calcium, magnesium, fluorine and silicon elements in the wastewater simultaneously, good in effluent effect and beneficial to follow-up comprehensive utilization of the wastewater, the dosage of chemical raw materials can be reduced, the produced sludge amount can be effectively decreased, the main components of produced sludge are magnesium hydroxide and calcium carbonate, and follow-up comprehensive utilization of the sludge is facilitated.
Description
Technical field
The present invention relates to industrial waste water treatment, in particular to a kind of device and method removing calcium in waste water, magnesium, fluorine and element silicon.
Background technology
Along with industrial expansion, the waste water of generation is also various informative, complicated component, as the desulfurization wastewater of Coalsteam plant with FGD system, and one the dirtiest in power plant system beyond doubt water; Shale gas receives much concern as a kind of unconventional energy resource of emerging exploitation, but return discharge opeing containing the total dissolved solid of high density and the shale gas of number of chemical additive is that restriction shale gas exploits the bottleneck further developed always.The waste water of, complicated component high for these suspension contents, treatment process traditional is at present exactly chemical method coagulant precipitation, main purpose is the pollutents such as the suspended substance effectively removed in waste water, heavy metal ion, hardness/basicity, organism, silicon, so that subsequent technique process.
Mostly containing calcium, magnesium, fluorine, this several typical inorganic pollutant of silicon in these waste water.Hardness ions such as calcium ions and magnesium ions is common a large amount of ions, if the too high meeting of content causes equipment to have fouling risk in sewage treatment equipment, affects the recycling of water resources; Fluorine is one of needed by human body trace element, the fluorine mass concentration that tap water is suitable for is 0.5 ~ 1.0mg/L, industrial, the fluorochemical of waste water often containing high density of the industry discharges such as fluorine-containing ore exploitation, Metal smelting, organic synthesis chemical industry, electronics, plating, causes fluoride pollution; Silicon is main with the SiO suspended in waste water
2with dissolved silicon acid ion (SiO
3 2-) two kinds of forms exist, silicon very easily forms colloid in waste water, can have a strong impact on the operation of water technology equipment.At present, there is a lot of minimizing technology to calcium, magnesium, fluorine, silicon in waste water, but be all for wherein a kind of.
In view of this, special proposition the present invention.
Summary of the invention
The first object of the present invention is to provide a kind of device removing calcium in waste water, magnesium, fluorine and element silicon, in described removal waste water, to have structure simple for the device of calcium, magnesium, fluorine and element silicon, processing efficiency is high, effectively can remove calcium, magnesium, fluorine and the element silicon in waste water simultaneously, outlet effect is good, is conducive to the advantages such as the follow-up comprehensive utilization of waste water.
The second object of the present invention is to provide a kind of method adopting above-mentioned device to remove calcium, magnesium, fluorine and element silicon in waste water, the method technique is simple, treatment time is short, effectively can remove calcium, magnesium, fluorine and the element silicon in waste water simultaneously, outlet effect is good, be conducive to the comprehensive utilization that waste water is follow-up, the dosage of chemical feedstocks can not only be reduced, also produced sludge quantity can effectively be reduced, the mud main component produced is respectively magnesium hydroxide and calcium carbonate, contributes to the follow-up comprehensive utilization realizing mud.
In order to realize above-mentioned purpose of the present invention, spy by the following technical solutions:
Remove a device for calcium in waste water, magnesium, fluorine and element silicon, in described removal waste water, the device of calcium magnesium fluorine silicon comprises the first reactor, the first tripping device, the second reactor and the second tripping device; Described first reactor, the first tripping device, the second reactor are connected in turn with the second tripping device.
The apparatus structure that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, wherein the first reactor, the first tripping device, the second reactor are connected in turn with the second tripping device, waste water flows through the first reactor, the first tripping device, the second reactor and the second tripping device successively, successively in the first reactor and the second reactor, carry out twice sofening treatment respectively, effectively can remove calcium, magnesium, fluorine and element silicon in waste water simultaneously; In the first tripping device and the second tripping device, carry out mud and water outlet separating treatment respectively after each sofening treatment, fully ensure effluent characteristics.
Preferably, described first reactor and the second reactor are respectively stirred reactor.
Preferably, described first tripping device and the second tripping device are respectively settling pond.
Preferably, described first tripping device and the second tripping device are respectively mud-dreg separating contact type clarification tank.
Further preferably, described first tripping device and the second tripping device are respectively mechanical accelerating purifying pool, circulatior clarifier, sludge blanket clarifier or plusator.
What the treatment process of water and waste water comprised the mixing of water and medicament, reaction and flocs unit and water is separated three phases.In prior art, settling pond has been exactly that above-mentioned three processes are in the Special Equipment of one.
And the device that the present invention removes calcium in waste water, magnesium, fluorine and element silicon arranges the first reactor and the second reactor, for mixing, the reaction of water and medicament, first tripping device and the second tripping device being separated only for mud and water outlet, help lend some impetus to being separated of mud and the water outlet of settling pond supernatant liquor, the delivery turbidity of further reduction settling pond supernatant liquor, improves settling pond supernatant liquor effluent characteristics.
Mud-dreg separating contact type clarification tank by coagulation clarification except the plurality of impurities in anhydrating, can comprise carbonate hardness, larger molecular organics, suspended substance, colloid etc.Mud-dreg separating contact type clarification tank has body refuse contact and is separated two kinds of functions with body refuse, high rate cyclic can be forced to strengthen reaction and to dissolve, also can formative dynamics body refuse or suspension slime layer, utilize active sludge contact process and huge contact surface area, remove organism colloid substances and the mineral colloid thing (as colloidal silicon, iron, aluminium) of relatively small molecular weight, and medicament and product thereof are condensed in noresidue.
Mechanical accelerating purifying pool by the former water of the active sludge layer of suspended state and dosing under mechanical agitation, can increase particle collision chance, improves coagulation effect.Through the clear water that is separated to rising, flow out through water leg, the body refuse part of the avaling former water mechanically mixing with dosing that refluxes again react, and part is periodic exhaustion after concentrating then.Mechanical accelerating purifying pool is to the strong adaptability of the water yield, water intermediate ion change in concentration, and treatment effect is stablized, and processing efficiency is high.But by mechanical stirring, power consumption is comparatively large, seriously corroded, maintenance difficult.
Circulatior clarifier, under the effect of water sprayer, fully mixes the active sludge suction in pond and former water, thus the contact strengthened in water between solid particulate and adsorption, form good flocculation, accelerate settling velocity and water is clarified.The former water having added coagulating agent enters nozzle from inlet channel, to spray into trunnion at a high speed, vacuum is formed around the hydraucone of trunnion, suck about 3 times to the body refuse amount of former water, mix with the rapid of former water through body refuse, enter the first reaction chamber that flaring is tubular, and carry out coagulating treatment in the second reaction chamber.Trunnion can move up and down the spacing regulating nozzle and trunnion, makes 1 ~ 2 times that equals nozzle diameter, and controls the body refuse amount of backflow whereby.Current enter separate chamber from the second reaction chamber, and due to the sudden enlargement of basal area, flow velocity reduces, body refuse just avales, wherein a part of body refuse enters body refuse thickening cone and is regularly discharged, and most of body refuse is inhaled into trunnion and refluxes, and clear water rises and flows out from water leg.
Former water after sludge blanket clarifier can make dosing, from bottom to top by being in the slime layer of suspended state, makes the particle collision of impurities in water and body refuse suspended layer condense and precipitation separation.
Plusator can make suspended layer constantly produce periodic compression and expansion, impels solid impurity and established body refuse in former water to carry out the pond of contact flocculation and precipitation separation.This change is caused by surge generator.When upflow velocity hour, body refuse suspended layer shrinks, concentration increases and makes particle alignment tight; When upflow velocity is large, body refuse suspended layer expands.
Preferably, described first tripping device and the second tripping device are respectively ultra-filtration equipment.
Ultra-filtration equipment is a kind of pressurization membrane separation unit, namely under pressure, makes small molecules solute and solvent through the special film of certain pore size, and make macromole solute can not be through, stays film, thus makes macromolecular substance obtain the purifying of part.The solvent contained in feed liquid and various little solute arrive low-tension side from high pressure feed liquid side through filter membrane, thus obtain permeate or be called ultrafiltrated; Its ultra-filtration membrane micropore can reach 0.01 micron (100,000/millimeter) below, and under effectively removing the particulate in water, colloid, bacterium, thermal source and the effect of organism power, and the size solute molecule tunicle larger than membrane pore size retains into concentrated solution.
Ultrafiltration belongs to pressure-driven membrane separating process, and the separating ranges of ultra-filtration membrane is macromolecular substance and the colloid speciality of relative molecular mass 500-100 ten thousand, and the diameter of corresponding particle is 0.005-0.1 μm; Separating mechanism is commonly considered as mechanical grading hyperfiltration membrane assembly board-like, rolling water purification ultra-filtration membrane.
Concentration polarization is the spontaneous phenomenon of membrane separating process, how this phenomenon is relieved to minimum level, is one of important topic of ultra-filtration technique.The measure taked at present has: 1. improve face flow velocity, to reduce boundary layer thickness, and the solute be trapped is walked by water-band in time; 2. the washing measure of physics or chemistry is taked.
Typical process flow: stoste-storage tank-force (forcing) pump-accurate filter-hollow fiber ultrafiltration equipment-container for storing liquid-backwash water tank-backwashing pump.
Compare other tripping devices, ultra-filtration equipment has the following advantages:
1. ultra-filtration process carries out at normal temperatures, and mild condition is without component damage, thus suitable to heat sensitive material especially, as the separation of medicine, enzyme, fruit juice etc., classification, concentrated and enrichment.
2. ultra-filtration process does not change, and without the need to heating, energy consumption is low, without the need to adding chemical reagent, pollution-free, is a kind of isolation technique of energy-conserving and environment-protective.
3. ultra-filtration technique separation efficiency is high, to the recovery of the trace ingredients in dilute solution, the concentrated all very effective of low concentration solution.
4. ultra-filtration process only adopts pressure as the power of membrane sepn, therefore tripping device is simple, flow process is short, easy and simple to handle, be easy to control and safeguard.
Reasonable in design, handsome in appearance, the highly versatile of ultra-filtration equipment, draw materials exquisite, sturdy and durable.Stable chemical performance, erosion resistance is strong, the erosion of acid-and base-resisting, salt (pH value: 0 ~ 14), nontoxic, tasteless, lightweight, intensity high (high temperature resistant, high pressure), rapid operation.Tubular ultra-filtration membrane equipment all kinds of styles is widely used in the fields such as oil, chemical industry, fruit juice, light industry, pharmacy, food, development of resources, metallurgical coal, national defense industry, environment protection.
Further preferably, described first tripping device and the second tripping device are respectively tubular ultra-filtration membrane device or immersion ultra-filtration equipment.
Adopt above-mentioned device to remove the method for calcium, magnesium, fluorine and element silicon in waste water, described waste water is discharged after flowing through the first reactor, the first tripping device, the second reactor and the second tripping device successively; Wherein, alkali is added in the first reactor, preferably add lime or sodium hydroxide reacts, first reactor gained reaction solution enters the first tripping device, in first tripping device, gained supernatant liquor enters second point of reactor, in the second reactor, add sodium carbonate react, the second reactor gained reaction solution enters the second tripping device, and the second tripping device gained supernatant liquor enters subsequent technique.
The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, first in waste water, add alkali, be preferably lime or sodium hydroxide, after stirring reaction, magnesium precipitates completely with the form of magnesium hydroxide, silicon is separated out by adsorbing or precipitate with the form such as Magnesium Silicate q-agent or Calucium Silicate powder, and fluorine is with the Precipitation of Calcium Fluoride (Fluorspan); Add sodium carbonate afterwards, after stirring reaction, calcium precipitates completely with the formation of calcium carbonate, and remaining a small amount of silicon and fluorine are still likely adsorbed in precipitation and are precipitated; The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, has the Mg (OH) of huge surface area
2and CaCO
3the suspended substance, colloid etc. of throw out in precipitation process in a large amount of adsorbed water body, contribute to improving effluent characteristics;
Preferably, for different waste water qualities, the present invention also can distinguish to some extent on dosing is selected, for the waste water of hardness ions content Ca:Mg>=3:1 in waste water, first reactor preferably adds sodium hydroxide, and the second reactor preferably adds enough sodium carbonate, reduces reagent consumption and sludge quantity; For the waste water of hardness ions content Mg:Ca>=3:1 in waste water, the first reactor preferably adds lime, and the second reactor preferably adds enough sodium carbonate, to ensure clearance and the outlet effect of pollutent; For SO
4 2-ionic concn is greater than the waste water of 8000mg/L, first reactor preferably adds lime, second reactor preferably adds enough sodium carbonate, and calcium can precipitate with the form of Calcium Fluoride (Fluorspan), calcium sulfate at the first reactor, effectively can reduce reagent consumption amount and the sludge quantity of the second reactor.
The method technique that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, treatment time is short, effectively can remove calcium, magnesium, fluorine and the element silicon in waste water simultaneously, outlet effect is good, be conducive to the comprehensive utilization that waste water is follow-up, the dosage of chemical feedstocks can not only be reduced, also can effectively reduce produced sludge quantity, the mud main component produced is respectively magnesium hydroxide and calcium carbonate, contributes to the follow-up comprehensive utilization realizing mud.
Preferably, to control waste water in the first reactor be pH is more than 11.
Controlling waste water in the first reactor is alkalescence, contributes to magnesium is precipitated completely with the form of magnesium hydroxide, promotes that silicon is separated out by adsorbing or precipitate with the form such as Magnesium Silicate q-agent or Calucium Silicate powder, promotes that calcium fluoride precipitate is complete.
Preferably, the hydraulic detention time controlled in the first reactor is 0.5-6h, is preferably 0.5-4h, more preferably 0.5-2h.
Control to keep specific hydraulic detention time in the first reactor, help lend some impetus to sufficient reacting in the first reactor, magnesium being precipitated completely with the form of magnesium hydroxide, promoting that silicon is separated out by adsorbing or precipitate with the form such as Magnesium Silicate q-agent or Calucium Silicate powder, promote that calcium fluoride precipitate is complete.
Preferably, the hydraulic detention time controlled in the first tripping device is 0.5-6h, is preferably 1-4h, more preferably 1.5-3h.
Control to keep specific hydraulic detention time in the first tripping device, help lend some impetus to the abundant separation of the mud such as magnesium hydroxide, Magnesium Silicate q-agent, Calucium Silicate powder, Calcium Fluoride (Fluorspan) be obtained by reacting in the first reactor, improve the effluent characteristics of the first tripping device.
Preferably, to control waste water in the second reactor be pH is more than 10.
Controlling waste water in the second reactor is alkalescence, and contribute to calcium is precipitated completely with the formation of calcium carbonate, remaining a small amount of silicon and fluorine are still likely adsorbed in precipitation of calcium carbonate and are precipitated.
Preferably, the hydraulic detention time controlled in the second reactor is 0.5-6h, is preferably 0.5-4h, more preferably 0.5-2h.
Control to keep specific hydraulic detention time in the second reactor, help lend some impetus to sufficient reacting in the second reactor, calcium is precipitated completely with the formation of calcium carbonate, remaining a small amount of silicon and fluorine are still likely adsorbed in precipitation of calcium carbonate and are precipitated.
Preferably, the hydraulic detention time controlled in the second tripping device is 0.5-4h, is preferably 0.5-2h, more preferably 0.5-1h.
Control to keep specific hydraulic detention time in the second tripping device, help lend some impetus to the abundant separation of the mud such as the calcium carbonate be obtained by reacting in the second reactor, improve the effluent characteristics of the second tripping device.
Compared with prior art, beneficial effect of the present invention is:
The apparatus structure that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, wherein the first reactor, the first tripping device, the second reactor are connected in turn with the second tripping device, waste water flows through the first reactor, the first tripping device, the second reactor and the second tripping device successively, successively in the first reactor and the second reactor, carry out twice sofening treatment respectively, effectively can remove calcium, magnesium, fluorine and element silicon in waste water simultaneously; In the first tripping device and the second tripping device, carry out mud and water outlet separating treatment respectively after each sofening treatment, fully ensure effluent characteristics.
The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, first in waste water, add alkali, be preferably lime or sodium hydroxide, after stirring reaction, magnesium precipitates completely with the form of magnesium hydroxide, silicon is separated out by adsorbing or precipitate with the form such as Magnesium Silicate q-agent or Calucium Silicate powder, and fluorine is with the Precipitation of Calcium Fluoride (Fluorspan); Add sodium carbonate afterwards, after stirring reaction, calcium precipitates completely with the formation of calcium carbonate, and remaining a small amount of silicon and fluorine are still likely adsorbed in precipitation and are precipitated; The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, has the Mg (OH) of huge surface area
2and CaCO
3the suspended substance, colloid etc. of throw out in precipitation process in a large amount of adsorbed water body, contribute to improving effluent characteristics;
The method technique that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, treatment time is short, effectively can remove calcium, magnesium, fluorine and the element silicon in waste water simultaneously, outlet effect is good, be conducive to the comprehensive utilization that waste water is follow-up, the dosage of chemical feedstocks can not only be reduced, also can effectively reduce produced sludge quantity, the mud main component produced is respectively magnesium hydroxide and calcium carbonate, contributes to the follow-up comprehensive utilization realizing mud.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the apparatus structure schematic diagram that the present invention removes calcium in waste water, magnesium, fluorine and element silicon;
Fig. 2 is the process flow sheet that the embodiment of the present invention 1 removes calcium in waste water, magnesium, fluorine and element silicon;
Fig. 3 is the process flow sheet that the embodiment of the present invention 2 removes calcium in waste water, magnesium, fluorine and element silicon;
Fig. 4 is the process flow sheet that the embodiment of the present invention 3 removes calcium in waste water, magnesium, fluorine and element silicon.
Reference numeral:
1-first reactor; 2-first tripping device; 3-second reactor;
4-second tripping device; 5-stirred reactor; 6-mechanical accelerating purifying pool;
7-tubular ultra-filtration membrane device.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is clearly and completely described, but it will be understood to those of skill in the art that, following described embodiment is the present invention's part embodiment, instead of whole embodiments, only for illustration of the present invention, and should not be considered as limiting the scope of the invention.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Unreceipted actual conditions person in embodiment, the condition of conveniently conditioned disjunction manufacturers suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, be and can buy by commercially available the conventional products obtained.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, particular case above-mentioned term concrete meaning in the present invention can be understood.
Embodiment 1
The desulfurization wastewater in fuel-burning power plant, East China contains the materials such as a large amount of suspended substances, organism, inorganics ion, silicon, in order to follow-up reverse osmosis process can normally run, what pretreatment process adopted is a kind of method removing calcium in waste water, magnesium, fluorine and element silicon that the present invention proposes, and in the removal waste water used, the apparatus structure of calcium, magnesium, fluorine and element silicon as shown in Figure 1; Described waste water is discharged after flowing through the first reactor 1, first tripping device 2, second reactor 3 and the second tripping device 4 successively; Described first reactor 1 and the second reactor 3 adopt stirred reactor 5 respectively, and described first tripping device 2 and the second tripping device 4 adopt mechanical accelerating purifying pool 6 respectively;
Wherein, in the first reactor, add enough lime, to control waste water in the first reactor be pH is more than 11, and the hydraulic detention time controlled in the first reactor is 4-6h, magnesium, silicon, fluorine element in removing waste water; The hydraulic detention time controlled in the first tripping device is 4-6h; In the second reactor, add sodium carbonate, to control waste water in the second reactor be pH is more than 10, and the hydraulic detention time controlled in the second reactor is 4-6h, removes the calcium constituent in the water body flowed out through the first tripping device, and the silicon of remnants and fluorine element; The hydraulic detention time controlled in the second tripping device is 2-4h.
Embodiment 2
The desulfurization wastewater that Coalsteam plant with FGD system in North China's produces contains the materials such as a large amount of suspended substances, heavy metal, inorganic salt, organism, and sulfate ion content is up to 30000mg/L, after traditional three header techniques, still containing a large amount of inorganic ions in water outlet, as potassium, sodium, calcium, magnesium, fluorion, chlorion, sulfate radical, silicon etc.Method and apparatus provided by the invention can effectively remove the materials such as calcium in waste water, magnesium, fluorine and silicon, and in the removal waste water used, the apparatus structure of calcium, magnesium, fluorine and element silicon as shown in Figure 1; Described waste water is discharged after flowing through the first reactor 1, first tripping device 2, second reactor 3 and the second tripping device 4 successively; Described first reactor 1 and the second reactor 3 adopt stirred reactor 5 respectively, and described first tripping device 2 adopts mechanical accelerating purifying pool 6, and the second tripping device 4 adopts tubular ultra-filtration membrane device 7;
Wherein, in the first reactor, add enough lime, to control waste water in the first reactor be pH is more than 11, and the hydraulic detention time controlled in the first reactor is 2-4h, magnesium, silicon, fluorine element in removing waste water; The hydraulic detention time controlled in the first tripping device is 3-4h; In the second reactor, add sodium carbonate, to control waste water in the second reactor be pH is more than 10, and the hydraulic detention time controlled in the second reactor is 4-6h, removes the calcium constituent in the water body flowed out through the first tripping device, and the silicon of remnants and fluorine element; The hydraulic detention time controlled in the second tripping device is 1-2h.
Embodiment 3
Southwestern China area is the vital area of exploitation shale gas, and the process that shale gas returns discharge opeing is a great problem that puzzlement shale gas is exploited always.Adopt this patented invention method and apparatus to remove shale gas in the present embodiment and return the materials such as calcium in discharge opeing, magnesium, fluorine and silicon, in the removal waste water used, the apparatus structure of calcium, magnesium, fluorine and element silicon as shown in Figure 1; Described waste water is discharged after flowing through the first reactor 1, first tripping device 2, second reactor 3 and the second tripping device 4 successively; Described first reactor 1 and the second reactor 3 adopt stirred reactor 5 respectively, and described first tripping device 2 and the second tripping device 4 adopt tubular ultra-filtration membrane device 7 respectively;
Wherein, add sufficient hydrogen sodium oxide in the first reactor, to control waste water in the first reactor be pH is more than 11, and the hydraulic detention time controlled in the first reactor is 0.5-2h, magnesium, silicon, fluorine element in removing waste water; The hydraulic detention time controlled in the first tripping device is 1.5-3h; In the second reactor, add sodium carbonate, controlling waste water in the second reactor is more than pH10, and the hydraulic detention time controlled in the second reactor is 0.5-2h, removes the calcium constituent in the water body flowed out through the first tripping device, and the silicon of remnants and fluorine element; The hydraulic detention time controlled in the second tripping device is 0.5-1h.
Experimental example
The method of calcium, magnesium, fluorine and element silicon in the removal waste water of embodiment of the present invention 1-embodiment 3 detected, acquired results is as shown in table 1.
Table 1 the present invention removes the method detected result of calcium in waste water, magnesium, fluorine and element silicon
Can be found out by table 1, the present invention is adopted to remove the device of calcium in waste water, magnesium, fluorine and element silicon, effectively can remove calcium, magnesium, fluorine and the element silicon in trade effluent, wherein the delivery turbidity of the first tripping device 2 is at below 5NTU, the delivery turbidity of the second tripping device 4 is at below 3NTU, and the total removal rate of calcium, magnesium, fluorine and element silicon respectively is 99%, 99%, 96%, more than 96%.
The apparatus structure that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, wherein the first reactor 1, first tripping device 2, second reactor 3 is connected in turn with the second tripping device 4, waste water flows through the first reactor 1, first tripping device 2, second reactor 3 and the second tripping device 4 successively, successively in the first reactor 1 and the second reactor 3, carry out twice sofening treatment respectively, effectively can remove calcium, magnesium, fluorine and element silicon in waste water simultaneously; In the first tripping device 2 and the second tripping device 4, carry out mud and water outlet separating treatment respectively after each sofening treatment, fully ensure effluent characteristics.
The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, first in waste water, add alkali, be preferably lime or sodium hydroxide, after stirring reaction, magnesium precipitates completely with the form of magnesium hydroxide, silicon is separated out by adsorbing or precipitate with the form such as Magnesium Silicate q-agent or Calucium Silicate powder, and fluorine is with the Precipitation of Calcium Fluoride (Fluorspan); Add sodium carbonate afterwards, after stirring reaction, calcium precipitates completely with the formation of calcium carbonate, and remaining a small amount of silicon and fluorine are still likely adsorbed in precipitation and are precipitated; The present invention removes in the method for calcium in waste water, magnesium, fluorine and element silicon, has the Mg (OH) of huge surface area
2and CaCO
3the suspended substance, colloid etc. of throw out in precipitation process in a large amount of adsorbed water body, contribute to improving effluent characteristics;
The method technique that the present invention removes calcium in waste water, magnesium, fluorine and element silicon is simple, treatment time is short, effectively can remove calcium, magnesium, fluorine and the element silicon in waste water simultaneously, outlet effect is good, be conducive to the comprehensive utilization that waste water is follow-up, the dosage of chemical feedstocks can not only be reduced, also can effectively reduce produced sludge quantity, the mud main component produced is respectively magnesium hydroxide and calcium carbonate, contributes to the follow-up comprehensive utilization realizing mud.
Although illustrate and describe the present invention with specific embodiment, however it will be appreciated that can to make when not deviating from the spirit and scope of the present invention many other change and amendment.Therefore, this means to comprise all such changes and modifications belonged in the scope of the invention in the following claims.
Claims (10)
1. remove a device for calcium in waste water, magnesium, fluorine and element silicon, it is characterized in that, in described removal waste water, the device of calcium magnesium fluorine silicon comprises the first reactor, the first tripping device, the second reactor and the second tripping device; Described first reactor, the first tripping device, the second reactor are connected in turn with the second tripping device.
2. a kind of device removing calcium in waste water, magnesium, fluorine and element silicon according to claim 1, it is characterized in that, described first tripping device and the second tripping device are respectively settling pond, preferably be respectively mud-dreg separating contact type clarification tank, be preferably respectively mechanical accelerating purifying pool, circulatior clarifier, sludge blanket clarifier or plusator further.
3. a kind of device removing calcium in waste water, magnesium, fluorine and element silicon according to claim 1, is characterized in that, described first tripping device and the second tripping device are respectively ultra-filtration equipment, is preferably respectively tubular ultra-filtration membrane device or immersion ultra-filtration equipment.
4. adopt the arbitrary described device of claim 1-3 to remove the method for calcium, magnesium, fluorine and element silicon in waste water, it is characterized in that, described waste water is discharged after flowing through the first reactor, the first tripping device, the second reactor and the second tripping device successively; Wherein, alkali is added in the first reactor, preferably add lime or sodium hydroxide reacts, first reactor gained reaction solution enters the first tripping device, in first tripping device, gained supernatant liquor enters second point of reactor, in the second reactor, add sodium carbonate react, the second reactor gained reaction solution enters the second tripping device, and the second tripping device gained supernatant liquor enters subsequent technique.
5. method according to claim 4, is characterized in that, controlling wastewater pH in the first reactor is more than 11.
6. method according to claim 4, is characterized in that, the hydraulic detention time controlled in the first reactor is 0.5-6h, is preferably 0.5-4h, more preferably 0.5-2h.
7. method according to claim 4, is characterized in that, the hydraulic detention time controlled in the first tripping device is 0.5-6h, is preferably 1-4h, more preferably 1.5-3h.
8. method according to claim 4, is characterized in that, controlling wastewater pH in the second reactor is more than 10.
9. method according to claim 4, is characterized in that, the hydraulic detention time controlled in the second reactor is 0.5-6h, is preferably 0.5-4h, more preferably 0.5-2h.
10. method according to claim 4, is characterized in that, the hydraulic detention time controlled in the second tripping device is 0.5-4h, is preferably 0.5-2h, more preferably 0.5-1h.
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| CN107500438A (en) * | 2017-09-29 | 2017-12-22 | 杭州匠容道环境科技有限公司 | Desulfurization wastewater softens pre-processing device and its processing method |
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| CN105540939B (en) | 2018-09-18 |
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Address after: 100000 room 101B, building 8, Huamao center, Chaoyang District, Beijing Patentee after: Zhonggong Waterer Water Technology Co., Ltd. Address before: 100000 room 101B, building 8, Huamao center, Chaoyang District, Beijing Patentee before: BEIJING WOTEER WATER TECHNOLOGY CO., LTD. |
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Denomination of invention: Device and method for removing calcium, magnesium, fluorine and silicon elements in wastewater Effective date of registration: 20191105 Granted publication date: 20180918 Pledgee: Zhonggong Water Co., Ltd. Pledgor: Zhonggong Waterer Water Technology Co., Ltd. Registration number: Y2019990000468 |