CN208135999U - Nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system - Google Patents
Nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system Download PDFInfo
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- CN208135999U CN208135999U CN201820391301.5U CN201820391301U CN208135999U CN 208135999 U CN208135999 U CN 208135999U CN 201820391301 U CN201820391301 U CN 201820391301U CN 208135999 U CN208135999 U CN 208135999U
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Abstract
The utility model discloses the nanofiltration softenings based on efficient flocculating, and salt waste water pretreatment system, including efficient flocculating unit and nanofiltration softening to be divided to divide salt unit；Efficient flocculating unit includes vacuum filter, flocculation tank, clarifying basin and mud pit；Nanofiltration softening divides salt unit to include cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；Vacuum filter is equipped with waterwater entrance, mud entrance, water outlet and cake outlet；Flocculation tank is equipped with water inlet and water outlet；Clarifying basin is equipped with water inlet, flocculation produces water out and precipitating slurry outlet；Mud pit is equipped with slurry outlet, ultrafiltration concentrated water entrance and mud entrance；Cyclic water tank is equipped with flocculation and produces water inlet, supernatant entrance and water outlet；Ultrafiltration system is equipped with water inlet, ultrafiltration water out and the outlet of ultrafiltration concentrated water；Nanofiltration system is equipped with water inlet, nanofiltration water out and the nanofiltration concentrated water being connected to crystallization settling tank and exports.
Description
Technical field
The utility model relates to field of waste water treatment, and in particular to it is a kind of based on efficient flocculating nanofiltration softening divide salt waste water
(such as desulfurization wastewater) pretreatment system and method.
Background technique
The high saliferous of desulfurization wastewater, high concentrtion, high rigidity, perchloride, high sulfate radical；Contain heavy metal, fluoride, vulcanization
Object, ammonia nitrogen, silicon, organic matter etc.；50 DEG C of water temperature or so；Especially polluted containing one or two classes of World Health Organization and China's strict control
Object etc.；And influenced by fire coal, sulfur removal technology water quality, desulfurizing agent etc., desulfurization waste water quality complicated component is changeable, regular fluctuation
Property is very big.
In recent years, along with the increasingly prominent of environmental problem, new environmental protection policy is constantly promulgated, environmental protection policy implementation dynamics
It is increasingly enhanced, desulfurization wastewater is as the one kind the most complicated, reluctant of ingredient in the regular waste water in coal-burning power plant, depth
Qualified discharge (when possessing receiving water body) or reuse have become trend of the times after reason.
The country generallys use traditional " three headers " system and technique carries out desulfurization wastewater pretreatment, but the system and technique
There are many deficiencies, such as：After traditional " three headers " chemical precipitation method processing, solubilised state salinity in waste water (predominantly chloride,
Sulfate) and organic matter etc. can hardly remove, be unable to direct emission also can not reuse, be only used for dry ash damping, grey field or
Coal yard spray, dry slag damping, wet slagging-off water, nature or mechanical spraying evaporation etc.；Although coal yard spray can consume a certain amount of
Desulfurization wastewater pretreated water, but remaining a large amount of alkali metal sulfates or chloride are brought into boiler combustion room in water, are caused
The fouling and slagging and heavy corrosion of inboard wall of burner hearth and heating surface, while the processing difficulty of desulphurization system is also increased, it significantly reduces
The transformation efficiency of desulfurized gypsum increases the water yield of desulfurization wastewater.
Because the prior art has obvious deficiency, there is an urgent need in the art to new desulfurization wastewater pretreatment system and sides
Method.
Summary of the invention
The utility model aim be to provide a kind of nanofiltration softening based on efficient flocculating divide salt waste water pretreatment system with
Method, the waste water can pre-process for desulfurization wastewater, the pretreatment system and method suitable for desulfurization wastewater.
The above-mentioned purpose of the utility model is achieved by following technical solution：
A kind of nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system, including efficient flocculating unit and nanofiltration it is soft
Change divides salt unit；The efficient flocculating unit includes vacuum filter, flocculation tank, clarifying basin and mud pit；The nanofiltration
Softening divides salt unit to include cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；
The vacuum filter is equipped with waterwater entrance, is connected to mud pit mud entrance is connected to flocculation tank
Water outlet and cake outlet；The flocculation tank is equipped with the water inlet being connected to vacuum filter and what is be connected to clarifying basin goes out
The mouth of a river；The clarifying basin be equipped be connected to flocculation tank water inlet, be connected to cyclic water tank flocculation production water out and with
The precipitating slurry outlet of mud pit connection；The mud pit is equipped with the slurry outlet and ultrafiltration system being connected to vacuum filter
The ultrafiltration concentrated water entrance of connection and the mud entrance being connected to crystallization settling tank, cyclic water tank；The cyclic water tank be equipped with it is clear
The flocculation of clear pond connection produces water inlet, the supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system；
Ultrafiltration system is equipped with the water inlet that is connected to cyclic water tank, the ultrafiltration water out being connected to nanofiltration system and is connected to mud pit
The outlet of ultrafiltration concentrated water；The nanofiltration system be equipped be connected to ultrafiltration system water inlet, nanofiltration water out and with crystallize settling tank
The nanofiltration concentrated water of connection exports.
Preferably, vacuum filter is disc type filter.
Preferably, flocculation tank is equipped with flocculant concentration equipment.
Preferably, ultrafiltration system uses the ultrafiltration membrane in 0.1 μm of aperture.Using the ultrafiltration membrane group in 0.1 μm of aperture as nanofiltration
The preposition pretreatment of system can remove 0.1 μm and all of above substance, be mainly used for removing fine suspension in efficient flocculating production water
Solid, oil emulsion, colloid (silicon), clay etc., effluent quality enter water water quality requirement better than nanofiltration system；Its concentrate drains into mud
Pond, water outlet enter water as nanofiltration system.
Preferably, nanofiltration system uses DK series Nano filtering composite membrane.Using the proprietary nanofiltration sandwich diaphragm of GE company DK, it is
A kind of technical grade equipment with high desalinization reusing sewage nanofiltration membrane, to divalent and multivalent ion preferential rejection, to the rejection of monovalention
Size is related to the concentration of feed liquid and composition.For waste water high-efficiency flocculate produce water softening divide salt (desalination, hardness, 1nm or more its
His impurity etc.).Concentrate is sent into crystallization settling tank, and crystallization settling tank supernatant is back to cyclic water tank, and crystallization mud enters mud
Stock tank, then be separated by solid-liquid separation to disc type vacuum hydroextractor.It, can divalent such as effectively catching calcium and magnesium and more after nanofiltration advanced treating
Valence salinity realizes softening and divides salt.Nanofiltration produces water and decrement is further concentrated, and water fully recovering, concentration decrement are produced after concentration decrement
Concentrated water afterwards can be used for the damping of dry ash slag or carry out end curing process, to realize wastewater zero discharge.
It preferably, further include cleaning unit for being cleaned for ultrafiltration system and nanofiltration system, the cleaning unit packet
Include purge tank, water pump, filter, instrument and meter and pipeline.
It is a kind of to divide salt pretreatment method for wastewater using the nanofiltration softening of above system, including：
Waste water is inputted into vacuum filter, filtrate is discharged into the wadding in flocculation tank and flocculation tank from water outlet
Flocculation reaction occurs for solidifying agent, is precipitated subsequently into clarifying basin, and the supernatant after precipitating produces water out from flocculation and enters circulation
Water tank, the precipitating mud in clarifying basin enter mud pit by precipitating outlet；The mud cake that vacuum filter generates makees solidification disposal of waste；
Supernatant in cyclic water tank enters ultrafiltration system by water outlet, after ultrafiltration production water enters back into nanofiltration system filtering
It obtains nanofiltration and produces water；The ultrafiltration concentrated water of ultrafiltration system discharge enters mud pit, and the nanofiltration concentrated water of nanofiltration system discharge enters crystallization
Settling tank；
Supernatant in crystallization settling tank enters cyclic water tank, and the mud for settling formation enters mud pit；
Mud in cyclic water tank enters mud pit；
Mud in mud pit enters vacuum filter, and filtrate is discharged into flocculation tank from water outlet.
Preferably, flocculant additive amount is 50mg-1.5g/L in flocculation tank；The mixing speed of flocculation reaction is 60r/
Min, reaction time 15-25min.
Preferably, flocculant is stirred with waste water using quick hybrid technique before flocculation reaction, mixing speed 100r/
Min, mixing time 2-5min.
Preferably, the cleaning waste liquid that cleaning unit generates is discharged into mud pit.
Compared with traditional chemical softening process, pretreatment system provided by the utility model and method are had the following advantages that：
1) without adding softening medicament, chemical tendering sludge is not generated yet, softening process operating cost can be greatly reduced；2) without construction
Occupation area of equipment is greatly decreased in giant chemical softening process equipment, and can reduce softening process investment；3) water hardness is produced to be better than
Chemical tendering technique；4) nanofiltration produces water TDS and produces water much smaller than traditional chemical softening, and concentration decrement concentrated water can be greatly reduced on year-on-year basis
Amount, to reduce solidification disposition investment and operating cost；5) Tthe utility model system relevance is strong, and waste water zero-emission may be implemented
It puts.
Detailed description of the invention
Fig. 1 is the utility model pretreatment system structural schematic diagram and process flow chart.
Specific embodiment
The essentiality content of the utility model is specifically introduced below with reference to embodiment, but the utility model is not limited with this
Protection scope.
The waste water of following embodiments is by taking desulfurization wastewater as an example.
A kind of nanofiltration softening based on efficient flocculating as shown in Figure 1 divides salt desulfurization wastewater pretreatment system, including efficient
Flocculation unit and nanofiltration softening divide salt unit；The efficient flocculating unit include vacuum filter, flocculation tank, clarifying basin and
Mud pit；The nanofiltration softening divides salt unit to include cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；
The vacuum filter connects equipped with desulfurization wastewater entrance, the mud entrance being connected to mud pit, with flocculation tank
Logical water outlet and cake outlet；The flocculation tank is equipped with the water inlet being connected to vacuum filter and is connected to clarifying basin
Water outlet；The clarifying basin is equipped with the water inlet being connected to flocculation tank, the flocculation being connected to cyclic water tank produces water out
The precipitating slurry outlet being connected to with mud pit；The mud pit is equipped with the slurry outlet being connected to vacuum filter and ultrafiltration
The ultrafiltration concentrated water entrance of system connectivity and the mud entrance being connected to crystallization settling tank, cyclic water tank；The cyclic water tank is equipped with
The flocculation being connected to clarifying basin produces water inlet, the supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system
Mouthful；Ultrafiltration system is equipped with the water inlet being connected to cyclic water tank, the ultrafiltration water out being connected to nanofiltration system and connects with mud pit
Logical ultrafiltration concentrated water outlet；The nanofiltration system is equipped with the water inlet being connected to ultrafiltration system, nanofiltration water out and sinks with crystallization
The nanofiltration concentrated water outlet of tank connection drops.
Wherein, vacuum filter is disc type filter；Flocculation tank is equipped with flocculant concentration equipment.Disc type
Vacuum filter acts on：1, main solid particles object in desulfurization wastewater is removed；2, mud cake can be with desulfurized gypsum etc. after being dehydrated
With disposition, dangerous waste will not be included in；3, desulfurization wastewater suspended matter is greatly lowered, flocculant can save 50% or more.
Ultrafiltration system uses the ultrafiltration membrane in 0.1 μm of aperture.Using the ultrafiltration membrane group in 0.1 μm of aperture as nanofiltration system before
Pretreatment is set, 0.1 μm and all of above substance can be removed, is mainly used for removing fine suspended solid, cream in efficient flocculating production water
Carburetion, colloid (silicon), clay etc., effluent quality enter water water quality requirement better than nanofiltration system；Its concentrate drains into mud pit, goes out
Water enters water as nanofiltration system.Nanofiltration system uses DK series Nano filtering composite membrane.It is compound using three layers of the proprietary nanofiltration of GE company DK
Film is that a kind of technical grade equipment with high desalinization reusing sewage nanofiltration membrane cuts divalent and multivalent ion preferential rejection to monovalention
Stay rate size related to the concentration of feed liquid and composition.Water softening, which is produced, for desulfurization wastewater efficient flocculating divides salt (desalination, hardness, 1nm
And above other impurities etc.).Concentrate is sent into crystallization settling tank, and crystallization settling tank supernatant is back to cyclic water tank, crystallizes mud
Slurry enters mud pit, then is separated by solid-liquid separation to disc type vacuum hydroextractor.It, can effectively catching calcium and magnesium etc. after nanofiltration advanced treating
Divalent and multivalence salinity realize softening and divide salt.Nanofiltration produces water and decrement is further concentrated, and produces water fully recovering after concentration decrement,
Concentrated water after concentration decrement can be used for the damping of dry ash slag or carry out end curing process, to realize desulfurization wastewater zero-emission.
Above-mentioned pretreatment system further includes cleaning unit.Ultrafiltration system and nanofiltration system require to clean, cleaning unit packet
Purge tank, water pump, medicament and chemicals dosing plant, filter, instrument and meter and pipeline etc. are included, cleaning waste liquid is discharged into mud pit.
Cleaning is divided into customary cleaning, maintainability cleaning and restorative cleaning.
1, customary cleaning：General recommendations, class Three's operation, per tour cleaning are primary；Split run operation, operation are cleaned after 7-10 hours
Once.Customary cleaning agent selects film producer or the dedicated sulfuric acid dirt cleaning agent of other producers, and cleaning method is cleaned with maintainability.
2, when flux depression 10% or so and bad customary cleaning effect, maintainability is needed to clean, maintainability cleaning
Medicament selects film producer or other specialized factory's medicaments.Cleaning method is as follows：
Nanofiltration cleaning is carried out first：Water first is produced with nanofiltration and cleans 10-30 points, and medicament is with direction wash cycles 10-30 of intaking
Point, 10-30 points of water rinsing is produced with nanofiltration later；Cleaning pressure is required according to nanofiltration manufacturer.Repeatedly, until nanofiltration system film
Flux reaches design standard.
Then ultrafiltration cleaning is carried out.Cleaning method is cleaned with nanofiltration.Underflow cleaning waste liquid is arranged after cleaning in time.Cleaning pressure
It is required according to ultrafiltration manufacturer.Repeatedly, until ultrafiltration system membrane flux reaches design standard.
3, when flux depression 20% or so and bad maintainability cleaning effect, restorative cleaning is needed, it is restorative clear
Film producer or other specialized factory's medicaments are selected in wash agent.Cleaning method is as follows：
Nanofiltration cleaning is carried out first：Water first is produced with nanofiltration and cleans 10-30 points, and medicament is with direction wash cycles 10-30 of intaking
Point, 10-30 points of water rinsing is produced with nanofiltration later, cleaning pressure is required according to nanofiltration manufacturer.Repeatedly, until nanofiltration system film
Flux reaches design standard.
Then ultrafiltration cleaning is carried out.Cleaning method is cleaned with nanofiltration；Underflow cleaning waste liquid is arranged after cleaning in time.Cleaning pressure
It is required according to ultrafiltration manufacturer.Repeatedly, until ultrafiltration system membrane flux reaches design standard.
A kind of nanofiltration softening based on above-mentioned pretreatment system divides salt desulfurization wastewater preprocess method, including：
Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into flocculation tank and flocculation tank from water outlet
Flocculant occur flocculation reaction, precipitated (hydraulic detention time >=20min) subsequently into clarifying basin, the supernatant after precipitating
Liquid produces water out from flocculation and enters cyclic water tank, and the precipitating mud in clarifying basin enters mud pit by precipitating outlet；
Supernatant in cyclic water tank enters ultrafiltration system by water outlet, after ultrafiltration production water enters back into nanofiltration system filtering
It obtains nanofiltration and produces water；The ultrafiltration concentrated water of ultrafiltration system discharge enters mud pit, and the nanofiltration concentrated water of nanofiltration system discharge enters crystallization
Settling tank；
Supernatant in crystallization settling tank enters cyclic water tank, and the mud for settling formation enters mud pit；
Mud in cyclic water tank enters mud pit；
Mud in mud pit enters vacuum filter, and filtrate is discharged into flocculation tank from water outlet.
Wherein, flocculant additive amount is 50mg-1.5g/L in flocculation tank；The mixing speed of flocculation reaction is 60r/
Min, reaction time 15-25min；Flocculant is stirred with waste water using quick hybrid technique before flocculation reaction, is stirred
Speed 100r/min, mixing time 2-5min.
The cleaning waste liquid that cleaning unit generates is discharged into mud pit.
Compared with traditional chemical softening process, pretreatment system provided by the utility model and method are had the following advantages that：
1) without adding softening medicament, chemical tendering sludge is not generated yet, softening process operating cost can be greatly reduced；2) without construction
Occupation area of equipment is greatly decreased in giant chemical softening process equipment, and can reduce softening process investment；3) water hardness is produced to be better than
Chemical tendering technique；4) nanofiltration produces water TDS and produces water much smaller than traditional chemical softening, and concentration decrement concentrated water can be greatly reduced on year-on-year basis
Amount, to reduce solidification disposition investment and operating cost；5) Tthe utility model system relevance is strong, and desulfurization wastewater zero may be implemented
Discharge.
The effect of above-described embodiment is specifically to introduce the essentiality content of the utility model, but those skilled in the art answer
When knowing, the protection scope of the utility model should not be confined to the specific embodiment.
Claims (6)
1. a kind of nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system, it is characterised in that：Including efficient flocculating list
Member and nanofiltration softening divide salt unit；The efficient flocculating unit includes vacuum filter, flocculation tank, clarifying basin and mud
Pond；The nanofiltration softening divides salt unit to include cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；
The vacuum filter is equipped with waterwater entrance, the mud entrance being connected to mud pit, the water outlet being connected to flocculation tank
Mouth and cake outlet；The flocculation tank is equipped with the water inlet being connected to vacuum filter and the water outlet being connected to clarifying basin
Mouthful；The clarifying basin is equipped with the water inlet being connected to flocculation tank, the flocculation being connected to cyclic water tank produces water out and and mud
The precipitating slurry outlet of stock tank connection；The mud pit is equipped with the slurry outlet being connected to vacuum filter, connects with ultrafiltration system
Logical ultrafiltration concentrated water entrance and the mud entrance being connected to crystallization settling tank, cyclic water tank；The cyclic water tank is equipped with and clarification
The flocculation of pond connection produces water inlet, the supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system；It is super
Filter system is equipped with the water inlet being connected to cyclic water tank, the ultrafiltration water out being connected to nanofiltration system and is connected to mud pit super
Filter concentrated water outlet；The nanofiltration system is equipped with the water inlet being connected to ultrafiltration system, nanofiltration water out and connects with crystallization settling tank
Logical nanofiltration concentrated water outlet.
2. pretreatment system according to claim 1, it is characterised in that：Vacuum filter is disc type filter.
3. pretreatment system according to claim 1, it is characterised in that：Flocculation tank is equipped with flocculant concentration equipment.
4. pretreatment system according to claim 1, it is characterised in that：Ultrafiltration system uses the ultrafiltration membrane in 0.1 μm of aperture.
5. pretreatment system according to claim 1, it is characterised in that：Nanofiltration system uses DK series Nano filtering composite membrane.
6. pretreatment system according to claim 1, it is characterised in that：It further include for being ultrafiltration system and nanofiltration system
The cleaning unit cleaned, the cleaning unit include purge tank, water pump, filter, instrument and meter and pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108408966A (en) * | 2018-03-21 | 2018-08-17 | 国电南京电力试验研究有限公司 | Nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108408966A (en) * | 2018-03-21 | 2018-08-17 | 国电南京电力试验研究有限公司 | Nanofiltration softening based on efficient flocculating divides salt waste water pretreatment system and method |
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Address after: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Patentee after: National Energy Group Science and Technology Research Institute Co.,Ltd. Address before: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. Patentee before: GUODIAN SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |