CN102616962B - Deep stage treatment method for industrial wastewater - Google Patents
Deep stage treatment method for industrial wastewater Download PDFInfo
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- CN102616962B CN102616962B CN201210089579.4A CN201210089579A CN102616962B CN 102616962 B CN102616962 B CN 102616962B CN 201210089579 A CN201210089579 A CN 201210089579A CN 102616962 B CN102616962 B CN 102616962B
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Abstract
The invention discloses a deep stage treatment method for industrial wastewater. The method comprises the following steps of: 1, primarily reducing hardness, settling, and neutralizing; 2, filtering; 3, performing electro-adsorption to appropriately remove salt; and 4, performing reverse osmosis to deeply remove salt. According to deep stage treatment method for the industrial wastewater, the water quality application range is wide, a process can run stably, salt can be deeply removed by the method, and a small amount of sewage which is produced by a treatment system and meets the standard is discharged, and secondary pollution is avoided; and the treated industrial wastewater can be used as industrial circulating water, industrial circulating cooling water, and boiler water. The problems that a reverse osmosis membrane is easy to pollute, and reverse osmosis concentrated water which does not meet standard is discharged, and the problem of low running stability are solved; all the discharged sewage which is discharged meets the standard; and the produced water has various water qualities, and the recycling range is widened.
Description
Technical field
The present invention is a kind of Deep stage treatment method for industrial wastewater.Belong to waste water multiple-stage treatment.
Background technology
Waste water, sewage, by process recycling, not only can be saved valuable water resources, and significantly can reduce sewage discharge, the physical environment that the protection mankind depend on for existence, and the life for the mankind is significant with economic Sustainable development.
The contaminated degree of trade effluent is comparatively large, developed country generally by trade effluent in production scene through simple process, the urban sewage treatment system entering very well equipped mixes laggard row relax with sanitary sewage, and independent reuse is actually rare in industrially developed country.
Trade effluent desalination Treatment for Reuse flow process, than municipal sewage treatment long flow path, generally adopts the flow process of secondary biochemical treatment-filtration-charcoal absorption-reverse osmosis-reuse again.
In prior art, the outer draining after refinery is up to standard by secondary biochemical treatment, after flocculation sediment, filtration and germicidal treatment, recirculated cooling water moisturizing is done in reuse.Find through investigation, this technique can be adopted for soft, low-corrosiveness, hyposaline sewage, but for the higher trade effluent of salts contg, when advanced treatment and reclamation, part or almost whole inorganic salt must be removed, the requirement of reuse water could be met.
At present, conventional desalination mode mainly contains: electrodialysis, reverse osmosis, ion exchange method and electro-adsorption method.The easy fouling of electroosmose process, floor space is comparatively large, is mainly used in groundwater treatment at present, yet there are no report for waste water treating and reutilizing aspect.
Reverse osmosis membrane requires very strict to influent quality, although desalination is comparatively thorough, film vulnerable to pollution, energy consumption are higher, and dense shipwreck is to reach emission standard.
Ion exchange method is more conventional, is mainly used in clean water treatment, but a large amount of acid will be consumed, alkali carries out manipulation of regeneration; Ion exchange resin is also subject to water Organic pollutants.
Electro-adsorption method is wide to inflow requirement, has certain contamination resistance, non-secondary pollution, is partial deionization technique, produces water and is only applicable to recirculated cooling water moisturizing at present.
Chinese patent CN200520087169.1 discloses a kind of sewage water recycling and processing equipment.This patent adopts electro-adsorption method to remove salt, partial organic substances in the sewage of biochemical treatment, and effluent reuse is in circulating water system.The water quality that this device is applicable to is that specific conductivity is less than 2500 μ S/cm.When specific conductivity is greater than 2500 μ S/cm, system will there will be obvious scaling tendency, and cause system cloud gray model instability, need matting frequently, effluent quality is also difficult to meet circulating cooling make-up water water quality requirement simultaneously.
Chinese patent CN201010265113.6 discloses a kind of wastewater recycling preparation system with low energy consumption.Adopt reverse osmosis---nanofiltration combination process reuse waste water, only Degradation be there is no to rejection to organics, concentrate organic dense water and there is the problem that intractability is large, processing cost is high.
In sum, reach the outer draining of emission standard after secondary biochemical treatment, the main treatment technology that current advanced treatment and reclamation adopts is reverse osmosis method desalination process and electro-adsorption method desalination process, and they exist following technical problem:
1. reverse osmosis deep desalting technique owned by France, desalination is comparatively thorough, produces water water quality better, but this technique requires comparatively strict to influent quality, and reverse osmosis membrane is vulnerable to pollute, and especially when variation water quality, the steady running of reverse osmosis process is by influenced;
2, reverse osmosis desalination technique is when processing waste water, and useless Organic substance in water can only concentrate in dense water side and can not degrade, and causes reverse osmosis concentrated water organic content to exceed emission standard, produces secondary pollution, and reverse osmosis concentrated water is difficult to process to emission standard;
3. electro-adsorption demineralization technique is when processing waste water, requires lower, while desalination, have certain removal effect to organism to influent quality, but it produces water water quality, and comparatively reverse osmosis is poor, belongs to appropriate desalination, and it produces water and can only be used as recirculated cooling water moisturizing at present.The advantage of electro-adsorption demineralization technique be sewer organism by Partial digestion, do not concentrate, dense water can qualified discharge.
Summary of the invention
The object of the invention is to avoid above-mentioned weak point of the prior art, and provide a kind of and be suitable for that water quality is wide in range, process runs well, can a small amount of sewage qualified discharge of producing of deep desalting, treatment system, do not produce secondary pollution; Trade effluent after treatment, is applicable to the Deep stage treatment method for industrial wastewater of industrial circulating water, industrial circulating cooling water, boiler feed water.
Object of the present invention can be reached by following measure:
Deep stage treatment method for industrial wastewater of the present invention, it is characterized in that described advanced treatment apparatus by tentatively reducing hardness operating unit, high efficiency filter operating unit, electro-adsorption appropriateness desalination unit be connected with reverse osmosis advanced desalination unit sequencing, be composited, wherein, electro-adsorption appropriateness desalination unit production water reaches industrial circulate water standard, and reverse osmosis advanced desalination unit output water quality reaches boiler feed water standard; Treatment process comprises the steps:
1.. tentatively reduce hardness, precipitation, neutralization
Pending trade effluent, first enter preliminary reduction hardness operating unit, add alkaline matter, under agitation hybrid reaction, sedimentation after reduction hardness, removes throw out; Waste water acidic substance neutralize, standby filtration; Processing condition are as follows:
2.. filter
Trade effluent after 1. step processes, enters high efficiency filter operating unit, after adding flocculation agent reaction, then adds sterilant, after filtration, and the suspended substance in removing waste water, standby appropriate desalination; Processing condition are as follows:
Flocculant addition mg/L 0 ~ 50
Flocculation reaction time min 5 ~ 30
Sterilant add-on mg/L 0 ~ 20
3.. electro-adsorption appropriateness desalination
Through the trade effluent of step 2. filtration treatment, enter electro-adsorption appropriateness desalination unit, processing condition are as follows:
The mould of electric adsorption module is to operating voltage V 1.0 ~ 1.8
Desalination working hour min 20 ~ 100
Regeneration backwash time min 20 ~ 100
After product water reaches reuse water quality standard, a production water part is sent to industrial circulate water water reservoir, and another part enters reverse osmosis advanced desalination unit; Regeneration sewer qualified discharge;
4.. reverse osmosis advanced desalination
From the trade effluent after step 3. appropriate desalination, enter reverse osmosis advanced desalination unit after adding Scale inhibitors, reductive agent, processing condition are as follows:
The ratio % 0 ~ 100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination production water
Producing water ratio % 20 ~ 80
Production water is sent to water storage tank on boiler of feeding, and dense water returns high efficiency filter operating unit, and the trade effluent after 1. processing with step mixes, and enters step together 2., continues to participate in process.
It is prevent the fouling in follow-up desalination treatment unit of the metal ion in sewage that the present invention arranges the preliminary object reducing hardness unit, affects the continuous and steady operation of desalting system.In high efficiency filter unit, processed further by the suspended substance tentatively reduced in hardness unit production water, object eliminates suspended substance to the impact of desalination plant continuous and steady operation.In electro-adsorption demineralization unit, carry out except Ficus caricaL to high efficiency filter unit production water, object is the zwitterion that part removes in water, makes it to reach circulating cooling make-up water water quality requirement; Meanwhile, electro-adsorption appropriateness desalination unit has certain Degradation to organism, and electro-adsorption produces water, and comparatively entering organic matter of water concentration is low, and saltiness is low, and especially hardness is low, greatly can alleviate the fouling membrane of reverse osmosis advanced desalination unit, reverse osmosis unit is run more stable.
Electro-adsorption demineralization utilizes charging electrode surface adsorption water intermediate ion and charged particles, dissolved salts and other charged contaminants in water is made to concentrate in electrode surface enrichment and realize partially desalted, therefore have influent quality requirement low, stable, energy consumption is low, long service life, maintenance of the equipment simply, not produce the features such as secondary pollution.At reverse osmosis advanced desalination unit, the further desalting treatment of water is produced to electro-adsorption, the water quality of production water can reach boiler feed water standard, and dense water returns high efficiency filter operating unit, and the trade effluent after 1. processing with step mixes, enter step together 2., continue to participate in process.Electro-adsorption regeneration sewer can qualified discharge.
Above four operating units are had complementary advantages, cooperation, jointly complete task of the present invention.
Object of the present invention can also be reached by following measure:
Deep stage treatment method for industrial wastewater of the present invention, step 1. described in processing condition as follows:
It is preferred technical scheme.
Deep stage treatment method for industrial wastewater of the present invention, is characterized in that processing condition described in step is 1. are as follows:
It is preferred technical scheme.
Deep stage treatment method for industrial wastewater of the present invention, step 1. described in alkaline matter be any one in sodium hydroxide, unslaked lime, calcium hydroxide; Described acidic substance are sulfuric acid or hydrochloric acid.
Deep stage treatment method for industrial wastewater of the present invention, step 1. described in stir adopt in air blast stirring, mechanical stirring or pipeline alr mode any one; Described precipitation is any one or its any two or more combination in natural sedimentation, inclined plate sedimentation, flocculating settling.
Deep stage treatment method for industrial wastewater of the present invention, step 2. described in filter be any one or its any two or more combination in sand filtration, fiber filter, laminated filtering, micro-filtration, ultrafiltration.
Deep stage treatment method for industrial wastewater of the present invention, step 2. described in processing condition as follows:
Flocculant addition mg/L 0 ~ 30
Flocculation reaction time min 5 ~ 20
Sterilant add-on mg/L 0 ~ 10.
It is preferred technical scheme.
Deep stage treatment method for industrial wastewater of the present invention, step 2. described in sterilant be any one in chlorine, dioxide peroxide, clorox, ozone.
Deep stage treatment method for industrial wastewater of the present invention, step is 3.. described in electro-adsorption appropriateness desalination process condition as follows:
The mould of electric adsorption module is to operating voltage V 1.2 ~ 1.6
Desalination working hour min 30 ~ 60
Regeneration backwash time min 30 ~ 60.
It is preferred technical scheme.
Deep stage treatment method for industrial wastewater of the present invention, step 3. described in electro-adsorption appropriateness desalination unit, its module operation scheme is the array configuration of single-stage, the above series, parallel of two-stage or series connection-parallel connection.
Deep stage treatment method for industrial wastewater of the present invention, step 4. described in processing condition be:
The ratio % 20 ~ 100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination production water
Producing water ratio % 50 ~ 75.
It is preferred technical scheme.
Deep stage treatment method for industrial wastewater of the present invention, step 4. described in Scale inhibitors be preferably FLOCON 260, add-on is 3 ~ 7mg/L.
Deep stage treatment method for industrial wastewater of the present invention, step 4. described in reductive agent be preferably sodium bisulfite, add-on is 1 ~ 4mg/L.
Deep stage treatment method for industrial wastewater of the present invention, the production water that it is characterized in that after treatment is applicable to industrial circulate water, boiler feed water and requires the mixing water that is obtained by mixing with arbitrary proportion by the production water of above two kinds of specifications according to reuse technology.
Claimed technical scheme of the present invention creates following beyond thought technique effect:
1. provide and a kind of be suitable for that water quality is wide in range, process runs well, can a small amount of sewage qualified discharge of producing of deep desalting, treatment system, containing producing secondary pollution; Trade effluent after treatment, is applicable to the Deep stage treatment method for industrial wastewater of industrial circulating water, industrial circulating cooling water, boiler feed water.
2. utilize the feature that electro-adsorption demineralization technique is lower to influent quality requirement, first trade effluent is processed, after the organism of electro-adsorption product water and salts contg are all stablized, part is as the water inlet of reverse osmosis process, when solving reverse osmosis process process industrial sewage, film easily pollutes, the problem of fluctuation of service;
3. utilize electro-adsorption demineralization technique organism to be had to the feature of certain removal effect while desalination, can not the reverse osmosis concentrated water secondary treatment of qualified discharge, solving reverse osmosis concentrated water can not the problem of qualified discharge.The dense water of electro-adsorption demineralization technique can qualified discharge, and therefore, the externally discharged waste water of whole set process can qualified discharge;
4. the present invention produces water has the electro-adsorption of the reverse osmosis produced water of deep desalting and partial deionization to produce water, two kinds produce water can by reuse requirements separately or mixing supply water, it is diversified to produce water water quality, has widened Reuse Range.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of Deep stage treatment method for industrial wastewater of the present invention
In figure
1 trade effluent
2 alkali
3 tentatively reduce hardness operating unit
4 acid
5 neutralization tanks
6 high efficiency filter operating units
7 electro-adsorption appropriateness desalination unit
8 reverse osmosis concentrated waters
9 electro-adsorption produce pond
10 Scale inhibitorss, reductive agent
11 reverse osmosis advanced desalination unit
12 reverse osmosis produced water outlets
13 electro-adsorption sewers
14 electro-adsorption production water
Embodiment
The present invention will now be further detailed embodiment:
Embodiment 1
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 3000 μ S/cm, COD30mg/L, hardness 900mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.5 that pH value controls, and alr mode is that air blast is stirred, and the hybrid reaction time is 20min, and the throw out removing method of generation is inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 6.8 that pH value controls, and the neutralization reaction time is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 2800 μ S/cm, hardness 200mg/L (with calcium carbonate).High efficiency filter operating unit filter type is laminated filtering, and filtering accuracy is 20 μm, does not add flocculation agent, sterilant.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.2V, working hour 34min, backwash time 34min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption appropriateness desalination unit produces water is 20%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, the producing water ratio 75% of reverse osmosis advanced desalination unit.Electro-adsorption appropriateness desalination unit produces water conductivity 1000 μ S/cm, COD 20mg/L; The product water conductivity 40 μ S/cm of reverse osmosis advanced desalination unit, COD does not detect; Sewer COD 30mg/L.
Embodiment 2
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 5000 μ S/cm, COD45mg/L, hardness 1000mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 12.0 that pH value controls, and alr mode is that air blast is stirred, and the hybrid reaction time is 10min, and the throw out removing method of generation is natural subsidence, and the settling time is 6h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 7.0 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 4600 μ S/cm, hardness 100mg/L (with calcium carbonate).High efficiency filter operating unit filter type is sand filtration+fiber filter combination, does not add flocculation agent, sterilant.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.6V, working hour 34min, backwash time 34min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption unit produces water is 50%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, reverse osmosis produced water rate 50%.The product water conductivity 1100 μ S/cm of electro-adsorption appropriateness desalination unit, COD 28mg/L; Reverse osmosis advanced desalination unit produces water conductivity 55 μ S/cm, and COD does not detect; Sewer COD 42mg/L.
Embodiment 3
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 5000 μ S/cm, COD45mg/L, hardness 1000mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 8.5 that pH value controls, and alr mode is mechanical stirring, and the hybrid reaction time is 30min, and the throw out removing method of generation is inclined plate sedimentation, and the settling time is 8h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 7.0 that pH value controls, and the time of neutralization reaction is 30min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 4850 μ S/cm, hardness 500mg/L (with calcium carbonate).High efficiency filter operating unit filter type is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 50mg/L, flocculation reaction time 15min.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.5V, working hour 20min, backwash time 40min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption unit produces water is 50%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, reverse osmosis advanced desalination unit producing water ratio 66%.Electro-adsorption appropriateness desalination produces water conductivity 1200 μ S/cm, COD29mg/L; The product water conductivity 62 μ S/cm of reverse osmosis advanced desalination unit, COD does not detect; Sewer COD 44mg/L.
Embodiment 4
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 3800 μ S/cm, COD40mg/L, hardness 700mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.5 that pH value controls, and alr mode is that air blast is stirred, and the hybrid reaction time is 10min, and the throw out removing method of generation is inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 8.0 that pH value controls, and the time of neutralization reaction is 5min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 240mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 20mg/L, flocculation reaction time 5min.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage parallel connection, and often pair of electrode forcing voltage is 1.4V, working hour 40min, backwash time 40min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption appropriateness desalination unit produces water is 50%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, the producing water ratio 75% of reverse osmosis advanced desalination unit.The product water conductivity 1200 μ S/cm of electro-adsorption appropriateness desalination unit, COD 30mg/L; The product water conductivity 55 μ S/cm of reverse osmosis advanced desalination unit, COD does not detect; Sewer COD 40mg/L.
Embodiment 5
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.8 that pH value controls, and alr mode is that air blast is stirred, and the hybrid reaction time is 5min, and the throw out removing method of generation is inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 6.5 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 10mg/L, flocculation reaction time 30min, and sterilant is clorox, and concentration is 5mg/L.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.5V, working hour 34min, backwash time 34min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption appropriateness desalination unit produces water is 50%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, the producing water ratio 66% of reverse osmosis advanced desalination unit.The product water conductivity 1000 μ S/cm of electro-adsorption appropriateness desalination unit, COD 25mg/L; The product water conductivity 30 μ S/cm of reverse osmosis advanced desalination unit, COD does not detect; Sewer COD 36mg/L.
Embodiment 6
Adopt the contaminated underground water of technical scheme process of the present invention, influent quality is specific conductivity 2500 μ S/cm, COD25mg/L, hardness 800mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 102 that pH value controls, and alr mode is mechanical stirring, and the hybrid reaction time is 10min, and the throw out removing method of generation is natural subsidence, and the settling time is 6h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 6.5 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 2350 μ S/cm, hardness 300mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 10mg/L, flocculation reaction time 30min; Sterilant is clorox, and concentration is 10mg/L.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.8V, working hour 60min, backwash time 60min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption unit produces water is 50%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, reverse osmosis produced water rate 66%.The product water conductivity 700 μ S/cm of electro-adsorption appropriateness desalination unit, COD 15mg/L; The product water conductivity 25 μ S/cm of reverse osmosis advanced desalination unit, COD does not detect; Sewer COD 23mg/L.
Embodiment 7
Adopt the contaminated underground water of technical scheme process of the present invention, influent quality is specific conductivity 2000 μ S/cm, COD25mg/L, hardness 500mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.5 that pH value controls, and alr mode is that air blast is stirred, and the hybrid reaction time is 15min, and the throw out removing method of generation is inclined plate sedimentation, and the settling time is 1.5h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 5.0 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 1850 μ S/cm, hardness 250mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+fiber filter combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 10mg/L, flocculation reaction time 30min; Sterilant is clorox, and concentration is 10mg/L.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.4V, working hour 100min, backwash time 100min.The ratio that reverse osmosis advanced desalination plant process electro-adsorption unit produces water is 100%, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, the producing water ratio 75% of reverse osmosis advanced desalination unit.The product water conductivity 900 μ S/cm of electro-adsorption appropriateness desalination unit, COD 20mg/L; Reverse osmosis produced water conductivity 25 μ S/cm, COD does not detect; Sewer COD 30mg/L.
Comparative example:
The present invention is described in further detail below in conjunction with the comparative example of embodiment 5:
Comparative example 1
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.8 that pH value controls, and alr mode is that air blast is stirred, and the time range of hybrid reaction is 5min, and the throw out removing method of generation is inclined plate sedimentation, and settling time scope is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 6.5 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 10mg/L, flocculation reaction time 30min; Sterilant is clorox, and concentration is 5mg/L.Electro-adsorption appropriateness desalination plant is not set.Reverse osmosis advanced desalination plant Scale inhibitors FLOCON260 adds concentration 5mg/L, and reductive agent sodium bisulfite adds concentration 2.5mg/L, reverse osmosis produced water rate 66%, reverse osmosis produced water conductivity 62 μ S/cm, and COD does not detect; Sewer COD 118mg/L.
Comparative example 2
Adopt the chemical engineering sewage of technical scheme process qualified discharge of the present invention, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (with calcium carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is sodium hydroxide, and it is 10.8 that pH value controls, and alr mode is that air blast is stirred, and the time range of hybrid reaction is 5min, and the throw out removing method of generation is inclined plate sedimentation, and settling time scope is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and it is 6.5 that pH value controls, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (with calcium carbonate).The filter type of high efficiency filter operating unit is sand filtration+laminated filtering combination, and add poly-ferric & aluminum flocculants before sand filtration, concentration is 10mg/L, flocculation reaction time 30min; Sterilant is clorox, and concentration is 5mg/L.In electro-adsorption appropriateness desalination plant, module operation scheme is two-stage series connection, and often pair of electrode forcing voltage is 1.5V, working hour 34min, backwash time 34min.Do not arrange reverse osmosis advanced desalination plant, electro-adsorption produces water conductivity 1050 μ S/cm, COD23mg/L; Sewer COD 32mg/L.
Claims (14)
1. a Deep stage treatment method for industrial wastewater, it is characterized in that advanced treatment apparatus by tentatively reducing hardness operating unit, high efficiency filter operating unit, electro-adsorption appropriateness desalination unit be connected with reverse osmosis advanced desalination unit sequencing, be composited, wherein, electro-adsorption appropriateness desalination unit production water reaches industrial circulate water standard, and reverse osmosis advanced desalination unit output water quality reaches boiler feed water standard; Treatment process comprises the steps:
1.. tentatively reduce hardness, precipitation, neutralization
Pending trade effluent, first enter preliminary reduction hardness operating unit, add alkaline matter, under agitation hybrid reaction, sedimentation after reduction hardness, removes throw out; Waste water acidic substance neutralize, standby filtration; Processing condition are as follows:
2.. filter
Trade effluent after 1. step processes, enters high efficiency filter operating unit, after adding flocculation agent reaction, then adds sterilant, after filtration, and the suspended substance in removing waste water, standby appropriate desalination; Processing condition are as follows:
Flocculant addition mg/L 0 ~ 50
Flocculation reaction time min 5 ~ 30
Sterilant add-on mg/L 0 ~ 20
3.. electro-adsorption appropriateness desalination
Through the trade effluent of step 2. filtration treatment, enter electro-adsorption appropriateness desalination unit, processing condition are as follows:
The mould of electric adsorption module is to operating voltage V 1.0 ~ 1.8
Desalination working hour min 20 ~ 100
Regeneration backwash time min 20 ~ 100
After product water reaches reuse water quality standard, a production water part is sent to industrial circulate water water reservoir, and another part enters reverse osmosis advanced desalination unit; Regeneration sewer qualified discharge;
4.. reverse osmosis advanced desalination
From the trade effluent after step 3. appropriate desalination, enter reverse osmosis advanced desalination unit after adding Scale inhibitors, reductive agent, processing condition are as follows:
The ratio % 0 ~ 100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination production water
Producing water ratio % 20 ~ 80
Production water is sent to water storage tank on boiler of feeding, and dense water returns high efficiency filter operating unit, and the trade effluent after 1. processing with step mixes, and enters step together 2., continues to participate in process.
2. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that processing condition described in step is 1. are as follows:
3. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that processing condition described in step is 1. are as follows:
4. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that alkaline matter described in step is 1. any one in sodium hydroxide, unslaked lime, calcium hydroxide; Described acidic substance are sulfuric acid or hydrochloric acid.
5. Deep stage treatment method for industrial wastewater according to claim 1, it is characterized in that stirring described in step 1. adopt in air blast stirring, mechanical stirring or pipeline alr mode any one; Described precipitation is any one or its any two or more combination in natural sedimentation, inclined plate sedimentation, flocculating settling.
6. Deep stage treatment method for industrial wastewater according to claim 1, it is characterized in that filtering described in step is 2. any one or its any two or more combination in sand filtration, fiber filter, laminated filtering, micro-filtration, ultrafiltration.
7. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that processing condition described in step is 2. are as follows:
Flocculant addition mg/L 0 ~ 30
Flocculation reaction time min 5 ~ 20
Sterilant add-on mg/L 0 ~ 10.
8. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that sterilant described in step is 2. any one in chlorine, dioxide peroxide, clorox, ozone.
9. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that the appropriateness of electro-adsorption described in step is 3. desalination process condition is as follows:
The mould of electric adsorption module is to operating voltage V 1.2 ~ 1.6
Desalination working hour min 30 ~ 60
Regeneration backwash time min 30 ~ 60.
10. Deep stage treatment method for industrial wastewater according to claim 1, it is characterized in that the appropriateness of electro-adsorption described in step 3. desalination unit, its module operation scheme is single-stage, the array configuration of the above series, parallel of two-stage or serial-parallel.
11. Deep stage treatment method for industrial wastewater according to claim 1, is characterized in that processing condition are described in step is 4.:
The ratio % 20 ~ 100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination production water
Producing water ratio % 50 ~ 75.
12. Deep stage treatment method for industrial wastewater according to claim 1, it is characterized in that Scale inhibitors is FLOCON 260 described in step 4., add-on is 3 ~ 7mg/L.
13. Deep stage treatment method for industrial wastewater according to claim 1, it is characterized in that reductive agent is sodium bisulfite described in step 4., add-on is 1 ~ 4mg/L.
14. Deep stage treatment method for industrial wastewater according to claim 1, the production water that it is characterized in that after treatment is applicable to industrial circulate water, boiler feed water and requires the mixing water that is obtained by mixing with arbitrary proportion by the production water of above two kinds of specifications according to reuse technology.
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| CN103172204A (en) * | 2013-04-09 | 2013-06-26 | 苏州市东宏环保科技有限公司 | Domestic water treatment system |
| CN103224307B (en) * | 2013-04-28 | 2015-05-06 | 浙江晶泉水处理设备有限公司 | Continuous electro-adsorption process-based sea water desalination apparatus |
| CN104341066B (en) * | 2013-08-06 | 2016-12-28 | 中国科学院过程工程研究所 | The advanced treating of a kind of industry standard discharge waste water and reclaiming system and method |
| CN103663861B (en) * | 2013-11-19 | 2015-06-24 | 南京师范大学 | Advanced treatment method for grading and recycling industrial park wastewater after biochemical processes |
| CN105481168B (en) * | 2014-10-09 | 2017-10-13 | 中国石油化工股份有限公司 | Coal gasification wastewater integrated conduct method |
| CN106277449A (en) * | 2016-08-28 | 2017-01-04 | 潘纪鸿 | The processing method of acidic industrial effluent |
| CN106186447B (en) * | 2016-08-31 | 2018-11-27 | 南京钰珏环境科技有限公司 | A kind of deep treatment method of recirculated cooling water supplement water |
| TWI626222B (en) * | 2017-01-26 | 2018-06-11 | 環琦實業股份有限公司 | A method for controlling the water quality of a circulating cooling water tower |
| CN109956579A (en) * | 2017-12-22 | 2019-07-02 | 神华集团有限责任公司 | The preprocess method and system of coal-burning power plant's desulfurization wastewater with high salt |
| CN109320001B (en) * | 2018-12-10 | 2023-08-22 | 环境保护部南京环境科学研究所 | High-salt high-turbidity industrial wastewater zero-emission system and process thereof |
| CN112679029B (en) * | 2019-10-18 | 2022-12-27 | 中国石油化工股份有限公司 | Coal gasification sewage reuse treatment method and device |
| CN110803809A (en) * | 2019-11-21 | 2020-02-18 | 河北涿州京源热电有限责任公司 | Treatment system for boiler makeup water |
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