CN107265696A - A kind of desulfurization wastewater sofening treatment device and method - Google Patents

A kind of desulfurization wastewater sofening treatment device and method Download PDF

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Publication number
CN107265696A
CN107265696A CN201710565564.3A CN201710565564A CN107265696A CN 107265696 A CN107265696 A CN 107265696A CN 201710565564 A CN201710565564 A CN 201710565564A CN 107265696 A CN107265696 A CN 107265696A
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China
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medicament
desulfurization wastewater
deliming
sofening treatment
nanofiltration
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Inventor
刘海洋
王建龙
贾非
吴金玲
徐小生
康淑敏
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Priority to CN201710565564.3A priority Critical patent/CN107265696A/en
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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
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • 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
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • 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
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/101Sulfur compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/12Halogens or halogen-containing compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/206Manganese or manganese compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02Softening water by precipitation of the hardness
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02Softening water by precipitation of the hardness
    • C02F5/06Softening water by precipitation of the hardness using calcium compounds

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The present invention provides a kind of desulfurization wastewater sofening treatment device, including:The softening pre-processing assembly being sequentially arranged and a nanofiltration system;The nanofiltration system has a concentrate recirculation mouthful;The softening pre-processing assembly has a medicament adding device, and the concentrate recirculation mouthful is connected with the medicament adding device.Sulfate radical is separated with chlorion by nanofiltration, and the nanofiltration concentrated water for concentrating sulfate radical is used for preparation softening medicament water, operating cost can be greatly reduced.The processing method realized based on said apparatus is provided simultaneously.

Description

A kind of desulfurization wastewater sofening treatment device and method
Technical field
The present invention relates to a kind of desulfurization wastewater sofening treatment device and method, belong to desulfurization wastewater process field.
Background technology
Wet desulphurization is the existing main flume desulfurization technology of domestic thermal power plant, and thermal power plant is every year in based Wet Process Flue Gas In can produce a large amount of desulfurization wastewaters.By taking a 300MW coal-burning power plant as an example, its per day generation desulfurization wastewater amount is about 300 tons. Desulfurization wastewater contain the calcium of plurality of heavy metal ion (such as mercury, lead, cadmium, manganese, arsenic), high suspended matter, and very high concentrations, magnesium, Sulfate radical and chlorion etc., are one of most intractable waste water of power plant.
Country's desulfurization wastewater main flow processing method is three company's case factures at present, and this method is mainly by adding medicament to de- Sulphur waste water is neutralized, flocculated respectively, settlement treatment, can remove most of heavy metal and suspension in waste water.But in waste water Calcium, magnesium, sulfate radical and the chlorion of high concentration are not removed effectively.This causes useless after three connect the processing of case method Water is very strong to equipment corrosion, is typically only capable to use as cinder of electric power plant landfill yard shower water, and coal yard dedusting sprinkling.But by It is very high in the solubility of calcium and magnesium chloride, easily rinsed with rainfall and spread and cause saline Land.Deteriorate increasingly with ecological environment, National environmental protection policy is increasingly strict, to desulfurization wastewater carry out advanced treating, go water removal in calcium, magnesium, sulfate radical and chlorion, into The major issue for needing to solve for Thermal Power Generation Industry.
Traditional softening method removes calcium ions and magnesium ions in water removal by the way of feeding lime breast and soda ash.However, desulfurization wastewater Middle calcium ions and magnesium ions are dense (about 3000 to 20000mg/L), and large quantities of lime breast and soda ash can be consumed using conventional method.Especially Soda ash consumption is very big, calculates (about 500 yuan/ton of milk of lime, about 1500 yuan/ton of soda ash) with existing market average price, desulfurization Waste water softening adding of agent cost will be up to tens yuan/ton.Meanwhile, if in desulfurization wastewater a large amount of sulfate radicals and chlorion without Separating treatment, can form mixed salt after condensing crystallizing.This mixed salt is difficult with no market value, and cost of disposal is very It is high.
The content of the invention
For the deficiency of existing desulfurization wastewater sofening treatment method, the invention provides a kind of desulfurization wastewater sofening treatment dress Put and method, separated sulfate radical with chlorion by nanofiltration, and the nanofiltration concentrated water for concentrating sulfate radical is used to prepare softening Medicament water, can be greatly reduced operating cost.
The present invention concrete technical scheme be:
A kind of desulfurization wastewater sofening treatment device, including:
The softening pre-processing assembly being sequentially arranged and a nanofiltration system;
The nanofiltration system has a concentrate recirculation mouthful;
The softening pre-processing assembly has a medicament adding device, the concentrate recirculation mouthful and the medicament adding device phase Even.
Further, the softening pre-processing assembly includes one first deliming list being connected with the medicament adding device Member.
Further, the softening pre-processing assembly also includes the demagging unit with demagging medicament adding device, tool There is one second deliming unit of deliming medicament adding device.
Further, the medicament adding device includes at least a medicament configuration unit and dosing unit, dosing unit and Concentrate recirculation mouthful is communicated to medicament configuration unit.
Further, the downstream of the demagging unit and the second deliming unit connects a precipitation unit.
A kind of desulfurization wastewater sofening treatment method, comprises the following steps:
Nanofiltration processing is carried out after the softened pretreatment of desulfurization wastewater;
The concentrate recirculation that the nanofiltration processing is produced is used as addition medicament (the softening medicament configuration in softening preprocessing process Solvent).
Further, the softening pretreatment includes being used as addition medicine after mixing with a configuration medicament using the concentrate recirculation Agent carries out a deliming to desulfurization wastewater.
Further, the softening pretreatment also includes addition demagging medicament to desulfurization wastewater progress demagging, adds deliming Medicament carries out secondary deliming to desulfurization wastewater.
Further, the demagging medicament includes basic agent, flocculant and flocculation aid;The configuration medicament D is sulfuric acid Sodium;The deliming medicament includes flocculant, flocculation aid and soda ash.
Further, the basic agent selects milk of lime;The flocculant, selected from aluminium polychloride, poly-ferric chloride, Bodied ferric sulfate, PAFC or PAFS;The flocculation aid, selected from cationic-type polyacrylamide, it is non-from Subtype polyacrylamide or anion-polyacrylamide.
Desulfurization wastewater as described above first passes through chemical tendering pretreatment, goes in water removal after most calcium ions and magnesium ions, then adopt With nanofiltration separation sulfate radical in waste water and chlorion.Sodium chloride purity may be used as work processed up to more than 98% in nanofiltration production water The raw material of industry salt or electrolysis caustic soda processed and hydrochloric acid.And due to containing high concentration sodium sulfate in nanofiltration concentrated water, it regard reuse as preparation Soften medicament water, consequently, it is possible to which great lot of water resources can be saved, while eliminating nanofiltration concentrated water disposal link, be conducive to letter Change flow and reduction waste water sofening treatment operating cost.
Brief description of the drawings
Fig. 1 is the arrangement schematic diagram of the desulfurization wastewater sofening treatment device of first, second and third embodiment of the invention.
Fig. 2 is the structure and principle of the desulfurization wastewater sofening treatment device Chinese medicine dispensing unit of fifth embodiment of the invention Schematic diagram.
Description of reference numerals:
1- demaggings pond, 2- agitating device A, 3- first stage precipitation tank, 4- mud line A, 5- one-level delimings pond, 6- agitating devices B, 7- medicament D add pipeline, bis- grades of deliming ponds of 8-, 9- agitating device C, 10- second-level settling pond, 11- mud lines B, 12- and received Filter system, 13- nanofiltration water producing pipes road, 14- nanofiltration concentrate recirculations pipeline, 15- medicaments D prepare pond A, 16- medicament D prepare pond B, 17- agitating device D, 18- medicaments D prepares pond A water intaking valves, 19- medicaments D and prepares pond A outlet valves, 20- agitating device E, 21- medicines Agent D prepares pond B water intaking valves, 22- medicaments D and prepares pond B outlet valves, 23- sodium sulphate proof dry powder feedings device, 24- medicaments preparation case, 25- Agitator.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not For limiting the present invention.
First embodiment:
The system of the present embodiment desulfurization wastewater sofening treatment, as shown in figure 1, including:As the demagging pond 1 of demagging unit, Agitating device A2, first stage precipitation tank 3, mud line A4, it is used as the one-level deliming pond 5 of the first deliming unit, agitating device B6, medicine Agent D adds pipeline 7, as two grades of deliming ponds 8 of the second deliming unit, agitating device C9, second-level settling pond 10, mud line B11, foregoing each portion's composition softening pre-processing assembly;Nanofiltration system 12, nanofiltration water producing pipe road 13, nanofiltration concentrate recirculation pipeline 14, Medicament D prepares pond A15, medicament D preparation pond B16, agitating device D17, medicament D preparations pond A water intaking valves 18, medicament D and prepares pond A and go out Water valve 19, agitating device E20, medicament D prepare pond B water intaking valves 21, medicament D and prepare pond B outlet valves 22.
Wherein, the demagging pond 1 and first stage precipitation tank 3 share the mud line A4, the one-level deliming pond 5, two grades Deliming pond 8 and second-level settling pond 10 share the mud line B11.
The demagging pond 1, first stage precipitation tank 3, one-level deliming pond 5, two grades of deliming ponds 8 and the bottom of second-level settling pond 10 are all provided with Have and agitating device or other uniform dresses are equipped with spoil disposal funnel, the demagging pond 1, one-level deliming pond 5 and two grades of deliming ponds 8 pond Put to ensure that water distribution is uniform in reactor.
In the demagging pond 1 pipeline is added provided with medicament A, B, C;Added in the one-level deliming pond 5 provided with the medicament D Pipeline 7;In two grades of deliming ponds 8 pipeline is added provided with medicament B, C, E;The medicament D prepares pond A15 and medicament D and prepares pond B16 adds pipeline provided with medicament D.
The medicament A is basic agent, preferably certain density milk of lime;The medicament B is flocculant, the flocculation Agent is aluminium polychloride, poly-ferric chloride, bodied ferric sulfate, PAFC or PAFS;The medicament C is to help Solidifying agent, can be cationic-type polyacrylamide, non-ionic polyacrylamide or anion-polyacrylamide.Described poly- third Acrylamide molecular weight is preferably 5 × 105 to 1.5 × 107 dalton;The medicament D be sodium sulphate, mass concentration be 1% to 20%;The medicament E is soda ash.
The main function of nanofiltration system 12 is separation sulfate and chloride, according to actual needs, can use one-level, Can be using multistage nanofiltration;
The nanofiltration membrane component of nanofiltration system 12 is rolled film, tubular membrane, Flat Membrane, hollow-fibre membrane or dish tubular membrane;
Further, the diaphragm operating pressure of nanofiltration system 12 is 0.3 to 6MPa.
The discharge nanofiltration of nanofiltration concentrated water pipeline 13 concentrated water is used for the medicament preparation water of the medicament D sodium sulphate medicaments.
The medicament D prepares pond A15 and medicament D and prepared in the B16 of pond provided with liquid level gauge.
The agitating device A2, agitating device B6, agitating device C9, agitating device D17, medicament D prepare pond A water intaking valves 18th, medicament D prepares pond A outlet valves 19, agitating device E20, medicament D and prepares pond B water intaking valves 21, medicament D preparation pond B outlet valves 22 start and stop are controlled by corresponding on-line automatic control device.
Specifically can be by following steps using above-mentioned desulfurization wastewater sofening treatment system processing desulfurization wastewater:
Step 1, desulfurization wastewater introduces the demagging pond 1, opens the agitating device A.First add the medicament A lime Breast, pH is adjusted to 10 to 13, to remove magnesium ion in the desulfurization wastewater.It is subsequently added the flocculant medicament B and described Flocculation aid medicament C, is flocculated.
Step 2, desulfurization wastewater overflow, to the first stage precipitation tank 3, is precipitated in the step 1 and produced in the demagging pond 1 Sludge.
Step 3, supernatant overflow, to the one-level deliming pond 5, opens agitating device B in the first stage precipitation tank 3.Add The medicament D sodium sulphate, makes most of calcium ion formation crystal of calcium sulfate in the desulfurization wastewater so that the desulfurization wastewater is hard Degree is down to 1000 to 5000mg/L (with calcium carbonates).
Step 4, desulfurization wastewater overflow, to two grades of deliming ponds 8, opens the agitating device in the one-level deliming pond 5 C.The medicament E sodium carbonate medicaments are added, to remove remaining calcium ion in the desulfurization wastewater so that the desulfurization wastewater hardness It is down to 5 to 300mg/L (with calcium carbonates).Flocculating agent B and flocculation aid C are subsequently added, flocculation treatment is carried out.
Step 5, in two grades of deliming ponds 8 desulfurization wastewater overflow to the second-level settling pond 10, precipitate the step 3 with The sludge produced in 4.
Step 6, in the second-level settling pond 10 after desulfurization wastewater filtering, circulate and concentrate into the nanofiltration system 12, point From sulfate radical and chlorion in desulfurization wastewater after the softening so that sodium chloride purity reaches more than 98% in nanofiltration production water.Reach Nanofiltration production water discharge system is marked, in case subsequent treatment.Nanofiltration concentrate recirculation prepares pond A15 and medicament D to the medicament D and prepares pond B16, is configured as needed to certain density metabisulfite solution and is used as softening medicament.
Step 7, the medicament D prepares pond A15 and medicament D and prepares pond B16 after the operation of system steady and continuous, by automatic Control system alternately receives the nanofiltration concentrated water and sodium sulphate medicament is alternately added into the one-level deliming pond, to ensure system Continuous operation.
Step 1 hydraulic detention time is 5 to 60 minutes;Step 2 hydraulic detention time is 5 to 30 minutes;Institute Step 3 hydraulic detention time is stated for 5 to 30 minutes;Step 4 hydraulic detention time is 5 to 45 minutes;Step 5 water The power residence time is 5 to 30 minutes.
Sodium sulfate concentration is 0.5% to 10% in nanofiltration concentrated water in the step 7.
Sludge in the step 5 is dehydrated by the mud line B into gypsum dehydration machine, can be used as gypsum by-product Using or be back to desulfurization slurry pond.
The opening and closing of related valve and opening for agitating device are controlled by the on-line automatic control system in the step 7 Stop.
Nanofiltration production water can carry out concentration as needed and evaporative crystallization processing prepares crystal salt, or be entered using other modes The processing of one step is utilized.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus and method as follows:Certain heat-engine plant desulfurized wastewater effluent water Matter is as follows:
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 12, it is described de- to remove Magnesium ion in sulphur waste water.It is subsequently added 25mg/L bodied ferric sulfates to be flocculated with 10mg/L polyacrylamides, flocculation water sample will Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond 10%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 22100mg/L (with calcium carbonate Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate Afterwards, waste water hardness is down to 82mg/L (with calcium carbonate).It is subsequently added 25mg/L bodied ferric sulfates and 10mg/L polyacrylamides Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter Enter nanofiltration system, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration, nanofiltration production water Middle sodium chloride purity reaches that sodium sulfate concentration reaches 47075mg/L in 98.7%, nanofiltration concentrated water, and cycles of concentration is up to 3.2 times.Nanofiltration is dense Water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A will replace with B Receive nanofiltration concentrated water and be alternately administered into one-level deliming pond.It is logical to utilize nanofiltration system concentrate recirculation, reduce softening medicament and disappear Consumption, through adjusting, in this embodiment, sofening treatment medicament expense is about 7 yuan/ton.
Second embodiment:
Certain heat-engine plant desulfurized waste water is handled using traditional softening process, raw wastewater water quality is as follows:
Milk of lime medicament is added into the desulfurization wastewater, wastewater pH is adjusted to 12, to remove magnesium in the desulfurization wastewater Ion.It is subsequently added 25mg/L bodied ferric sulfates to be flocculated with 10mg/L polyacrylamides, flocculation water sample is by overflow to one-level Sedimentation basin is precipitated.The overflow of first stage precipitation tank supernatant is to deliming pond, and into deliming pond, waste water adds sodium carbonate medicament, useless to remove Calcium ion in water, makes waste water hardness be down to 82mg/L (with calcium carbonate).It is subsequently added 25mg/L bodied ferric sulfates and 10mg/L Polyacrylamide is flocculated, and flocculation water sample precipitates overflow to second-level settling pond.Second-level settling pond supernatant is filtered through security personnel After device processing, further processing.Through adjusting, now sofening treatment medicament expense is about 16 yuan/ton.
3rd embodiment:
The system of the present embodiment desulfurization wastewater sofening treatment, same to first embodiment.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus as follows:Certain heat-engine plant desulfurized wastewater effluent water quality is such as Under:
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 13, it is described de- to remove Magnesium ion in sulphur waste water.It is subsequently added 500mg/L bodied ferric sulfates to be flocculated with 50mg/L polyacrylamides, flocculation water sample will Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond 30%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 29100mg/L (with calcium carbonate Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate Afterwards, waste water hardness is down to 7mg/L (with calcium carbonate).It is subsequently added 100mg/L bodied ferric sulfates and 20mg/L polyacrylamides Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter Enter nanofiltration system circulation concentration, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration, Sodium chloride purity reaches that sodium sulfate concentration reaches 51075mg/L in 98.2%, nanofiltration concentrated water in nanofiltration production water, and cycles of concentration is up to 4 times. Nanofiltration concentrated water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A and B Nanofiltration concentrated water will alternately be received and be alternately administered into one-level deliming pond.Through adjusting, now sofening treatment medicament expense is about 15.4 yuan/ton.
Fourth embodiment:
The system of the present embodiment desulfurization wastewater sofening treatment, same to first embodiment.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus as follows:Certain heat-engine plant desulfurized wastewater effluent water quality is such as Under:
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 11, it is described de- to remove Magnesium ion in sulphur waste water.It is subsequently added 50mg/L bodied ferric sulfates to be flocculated with 15mg/L polyacrylamides, flocculation water sample will Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond 1%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 34200mg/L (with calcium carbonate Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate Afterwards, waste water hardness is down to 298mg/L (with calcium carbonate).It is subsequently added 50mg/L bodied ferric sulfates and 15mg/L polyacrylamides Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter Enter nanofiltration system circulation concentration, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration, Sodium chloride purity reaches that sodium sulfate concentration reaches 55730mg/L in 98.9%, nanofiltration concentrated water in nanofiltration production water, and cycles of concentration is up to 4 times. Nanofiltration concentrated water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A and B Nanofiltration concentrated water will alternately be received and be alternately administered into one-level deliming pond.Through adjusting, now sofening treatment medicament expense is about 13.8 yuan/ton.
When conventional lime+soda ash softening technology is used it can be seen from the first and second embodiments reagent cost for 16 yuan/ Ton, and the softening process in the present invention is used, the medicament expense that sofening treatment can be greatly reduced is used, only 7 yuan/ton.That is this hair Bright technique has obvious economic advantages.It is of the invention it can be seen from other embodiment when handling high-concentration desulfurized waste water Technical scheme equally has larger cost advantage.
5th embodiment:
The processing of nanofiltration concentrate recirculation is adjusted, as shown in Fig. 2 nanofiltration concentrate recirculation to medicament prepares case 24, sulfuric acid Sodium proof dry powder feeding device 23 is to medicament configuration to congenial sodium sulphate dry powder, after being thoroughly mixed by agitator 25, as once The addition medicament of deliming.Solution is acted on behalf of using dry powder, facilitates medicament to add, same technique effect is resulted in.
It should be noted that in this manual, such as first and second or the like relational terms are used merely to one Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to Cover including for nonexcludability, so that process, method, article or terminal device including a series of key elements not only include Those key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or The intrinsic key element of person's terminal device.In the absence of more restrictions, being limited by sentence " including ... " or " including ... " Fixed key element, it is not excluded that also there is other want in the process including the key element, method, article or terminal device Element.In addition, herein, " being more than ", " being less than ", " exceeding " etc. are interpreted as not including this number;" more than ", " following ", " within " Etc. being interpreted as including this number.
Although the various embodiments described above are described, those skilled in the art once know basic wound The property made concept, then can make other change and modification to these embodiments, so embodiments of the invention are the foregoing is only, Not thereby the scope of patent protection of the present invention, the equivalent structure that every utilization description of the invention and accompanying drawing content are made are limited Or equivalent flow conversion, or other related technical fields are directly or indirectly used in, similarly it is included in the patent of the present invention Within protection domain.

Claims (10)

1. a kind of desulfurization wastewater sofening treatment device, it is characterised in that including:
The softening pre-processing assembly being sequentially arranged and a nanofiltration system;
The nanofiltration system has a concentrate recirculation mouthful;
The softening pre-processing assembly has a medicament adding device, and the concentrate recirculation mouthful is connected with the medicament adding device.
2. desulfurization wastewater sofening treatment device as claimed in claim 1, it is characterised in that the softening pre-processing assembly includes One first deliming unit being connected with the medicament adding device.
3. desulfurization wastewater sofening treatment device as claimed in claim 2, it is characterised in that the softening pre-processing assembly is also wrapped The demagging unit with demagging medicament adding device is included, the one second deliming unit with deliming medicament adding device.
4. desulfurization wastewater sofening treatment device as claimed in claim 3, it is characterised in that the demagging unit and the second deliming The downstream of unit connects a precipitation unit.
5. desulfurization wastewater sofening treatment device as claimed in claim 1, it is characterised in that the medicament adding device is included extremely Few a medicament configuration unit and dosing unit, dosing unit and concentrate recirculation mouthful are communicated to medicament configuration unit.
6. a kind of desulfurization wastewater sofening treatment method, comprises the following steps:
Nanofiltration processing is carried out after the softened pretreatment of desulfurization wastewater;
The concentrate recirculation that the nanofiltration processing is produced is as the addition medicament in softening preprocessing process.
7. desulfurization wastewater sofening treatment method as claimed in claim 6, it is characterised in that the softening pretreatment is included with institute State after concentrate recirculation is mixed with a configuration medicament as addition medicament to a desulfurization wastewater deliming of progress.
8. desulfurization wastewater sofening treatment method as claimed in claim 7, it is characterised in that the softening pretreatment also includes adding Plus demagging medicament carries out demagging to desulfurization wastewater, addition deliming medicament carries out secondary deliming to desulfurization wastewater.
9. desulfurization wastewater sofening treatment method as claimed in claim 8, it is characterised in that the demagging medicament includes alkaline medicine Agent, flocculant and flocculation aid;The configuration medicament is sodium sulphate;The deliming medicament includes flocculant, flocculation aid and soda ash.
10. desulfurization wastewater sofening treatment method as claimed in claim 9, it is characterised in that the basic agent selects lime Breast;The flocculant, selected from aluminium polychloride, poly-ferric chloride, bodied ferric sulfate, PAFC or polyaluminium sulfate Iron;The flocculation aid, selected from cationic-type polyacrylamide, non-ionic polyacrylamide or anion-polyacrylamide.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059255A (en) * 2017-12-27 2018-05-22 大唐(北京)水务工程技术有限公司 Dispensing system and method in a kind of processing applied to high magnesium desulfurization wastewater
CN110156181A (en) * 2018-03-27 2019-08-23 新疆环境工程技术有限责任公司 A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process
CN110590040A (en) * 2019-09-30 2019-12-20 江苏源拓环境科技有限公司 Wastewater treatment method and wastewater treatment system
CN111039488A (en) * 2020-01-06 2020-04-21 大唐环境产业集团股份有限公司 Desulfurization wastewater recycling treatment system and treatment method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2746986A1 (en) * 2010-07-23 2012-01-23 Peter S. Cartwright Water softener system using nanofiltration to reclaim a portion of the regenerating sodium chloride
CN105565573A (en) * 2016-02-05 2016-05-11 大唐环境产业集团股份有限公司 Device and method for desulfurization waste water zero discharge treatment
CN105712557A (en) * 2016-02-05 2016-06-29 大唐环境产业集团股份有限公司 Desulfurization waste water zero discharging treatment device and method
CN205556348U (en) * 2016-02-05 2016-09-07 大唐环境产业集团股份有限公司 Desulfurization waste water zero release processing apparatus
CN205653287U (en) * 2016-02-05 2016-10-19 大唐环境产业集团股份有限公司 Device that zero release of desulfurization waste water was handled
CN207738544U (en) * 2017-07-12 2018-08-17 大唐环境产业集团股份有限公司 A kind of desulfurization wastewater sofening treatment device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2746986A1 (en) * 2010-07-23 2012-01-23 Peter S. Cartwright Water softener system using nanofiltration to reclaim a portion of the regenerating sodium chloride
CN105565573A (en) * 2016-02-05 2016-05-11 大唐环境产业集团股份有限公司 Device and method for desulfurization waste water zero discharge treatment
CN105712557A (en) * 2016-02-05 2016-06-29 大唐环境产业集团股份有限公司 Desulfurization waste water zero discharging treatment device and method
CN205556348U (en) * 2016-02-05 2016-09-07 大唐环境产业集团股份有限公司 Desulfurization waste water zero release processing apparatus
CN205653287U (en) * 2016-02-05 2016-10-19 大唐环境产业集团股份有限公司 Device that zero release of desulfurization waste water was handled
CN207738544U (en) * 2017-07-12 2018-08-17 大唐环境产业集团股份有限公司 A kind of desulfurization wastewater sofening treatment device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059255A (en) * 2017-12-27 2018-05-22 大唐(北京)水务工程技术有限公司 Dispensing system and method in a kind of processing applied to high magnesium desulfurization wastewater
CN110156181A (en) * 2018-03-27 2019-08-23 新疆环境工程技术有限责任公司 A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process
CN110590040A (en) * 2019-09-30 2019-12-20 江苏源拓环境科技有限公司 Wastewater treatment method and wastewater treatment system
CN110590040B (en) * 2019-09-30 2023-08-25 江苏源拓环境科技有限公司 Wastewater treatment method and wastewater treatment system
CN111039488A (en) * 2020-01-06 2020-04-21 大唐环境产业集团股份有限公司 Desulfurization wastewater recycling treatment system and treatment method

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