CN102718351A - Device and method for sewage desalting - Google Patents
Device and method for sewage desalting Download PDFInfo
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- CN102718351A CN102718351A CN2012102414854A CN201210241485A CN102718351A CN 102718351 A CN102718351 A CN 102718351A CN 2012102414854 A CN2012102414854 A CN 2012102414854A CN 201210241485 A CN201210241485 A CN 201210241485A CN 102718351 A CN102718351 A CN 102718351A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a device for sewage desalting. The device is mainly as follows a water collection tank is connected with a settling pond through a vortex type pipeline mixer, wherein the vortex type pipeline mixer is connected with a coagulant feeding box; a water outlet of the settling pond is connected with a microfiltration system; a water outlet of the microfiltration system is connected with an agitating water tank; the agitating water tank is connected with an anti-sludge agent feeding box; a water outlet of the agitating water tank is connected with an electric adsorption device; and a water outlet of the electric adsorption device is connected with a water storage container. The invention further discloses a method for the sewage desalting. According to the device and the method for the sewage desalting, the water yield reaches to be more than 75% after sewage is deeply desalted and the desalting rate is more than 80%; and the desalted sewage can be directly used for industrial cycle cooling water.
Description
Technical field
The invention belongs to the advanced treatment of wastewater field, relate to a kind of device that can be used for the desalination of urban wastewater treatment firm secondary effluent particularly.
The invention still further relates to a kind of method of sewage desalination.
Background technology
In the last few years, along with the fast development of science and technology and in country the input energetically in the environmental protection field, the process water technology of China has obtained significant progress.By 2011, ten thousand yuan of gross domestic product water consumption 139m
3, descended 40.0% than 2008; Ten thousand yuan of industrial added value water consumption 82m
3, descended 37.1% than 2008.Yet along with Economic development, the contradiction of town water and process water is more outstanding, wherein annual water total amount 6,080 hundred million m in 2011
3, increase by 1.0% than the last year.Wherein, process water increases by 0.8%.The aggravation of the deficient day by day and contaminated degree of water resources becomes the key factor of some enterprise developments of restriction to a certain extent, is protection environment, conserve water resource, must constantly explore the method that improves water utilization rate, reduces wastewater disposition.Along with improving constantly of wastewater treatment in China rate, the reclaimed water reuse amount also constantly rises, but that reusing sewage accounts for the effluent sewage quantity discharged is still very low.In this case, the improvement of reusing sewage technology will become the emphasis of enterprise's water-saving and emission-reducing.
In industrial production, the industrial circulating cooling water consumption on average accounts for 80% of process water total amount, and the cooling water water withdrawal accounts for 30%～40% of industry water intaking total amount.Therefore, be to realize the main path of industrial water-saving and emission-reducing with reusing sewage in recirculated cooling water make up water and BW.For the urban wastewater treatment firm secondary effluent, conventional reuse of wastewater technology comprises that clarification, filtration, charcoal absorption etc. only can remove a part of colourity, suspended substance, turbidity and organism.If will satisfy the requirement of industrial circulating cooling water, just need further to remove hardness in the water, salinity etc.Especially the desalination problem of sewage becomes the bottleneck that restricts the reusing sewage technical development.Desalination technology commonly used mainly contains in the current reusing sewage: IX, electrodialysis, nanofiltration, r-o-, electro-deionisation etc.
Ion exchange method is a kind of of chemical deionization method, and it is that the Application of ion switching technology is carried out desalination.The ion-exchange demineralization process mainly is through H type or Na type cationite and OH type anionite, through ion exchange reaction, zwitterion in the water is got rid of, thereby is obtained de-salted water.The essence of IX is the chemical reaction that makes that another kind of ionogen carried out in ionogen and the solution on the resin, and this reaction can be neutralization reaction or replacement(metathesis)reaction.Ion exchange method is in the widespread use of desalination field, especially in removing water when Ca, Mg plasma, but to resin choose, manage and regeneration is had relatively high expectations.In addition, see from economic angle that when adopting the ion exchange technique desalination, the water inlet saltiness should not surpass 500mg/L, and the working cost of ion exchange resin is higher, the discharging of acid & alkali liquid also can cause secondary pollution.
Electrodialytic desalting is under the effect of applying direct current electric field; Utilize zwitterion to hand over the selection perviousness of film to zwitterion in the solution; Make ion do directionally migration; Be that negatively charged ion only allows through cavity block, positively charged ion only allows to pass through anode membrane. and reach separating of solute and solution, thereby realize the purpose of former water desalination.For guaranteeing that electrodialysis unit is steady in a long-term, reliability service, former water must carry out strict pre-treatment before advancing electrodialyzer, raw water turbidity is controlled at below the 3NTU, and guarantees requirements up to specification such as Fe, Mn, Cl.Electroosmose process desalination rate can reach 80%～90%, but WV is higher, and the decomposition of water be prone to take place, and the membrane stack scale formation is more serious, and the tensio-active agent in the sewage, protein, mikrobe etc. possibly produce film and pollute.
Nano filtering process is called " low pressure reverse osmosis " again; Can remove the solute ions about diameter 1nm, the about 200-1000 of molecular weight cut-off, higher to the interception of some high price salt in the sewage; Can remove in the secondary effluent 2/3 salinity; 4/5 hardness surpasses 90% dissolved carbon and THM precursor, and water outlet is near the safe drinking water standard.But for industrial circulating water, because monovalent ion, ammonia nitrogen etc. is not had removal effect basically, and easy fouling, thereby do not have significant advantage.
Reverse osmosis method is to use wider sewage desalination process at present, is impellent with the pressure of pressing greater than solute penetration, filters with semi-permeable membranes, makes solvent and the isolating method of solute in the solution.The technology of r-o-comprises pre-treatment, membrane sepn and aftertreatment.Reverse osmosis membrane is a kind ofly to process with exotic materials (like aromatic polyamides etc.) and working method, have semipermeability can film.It can make some components of the aqueous solution select to see through, thereby reach desalination, purification or concentrating and separating purpose under the impressed pressure effect.The range of application of reverse osmosis process is wider, as: large-sized boiler supplementary feed, various industrial pure water, tap water etc.But the water production rate of reverse osmosis membrane is lower, generally about 60%, and water inlet is had higher requirement, in addition, when membrane module is cleaned, also need add a large amount of acid, alkali can cause disadvantageous effect to environment.
Electro-deionisation is a kind of desalination process with " electrodialysis+IX "; Its desalination mechanism is that the sewage intermediate ion is adsorbed on the resin particle through exchange interaction earlier; " the ion transport passage " that under the extra electric field effect, constitutes via resin particle then moved to the film surface and seen through ion-exchange membrane and get into dense chamber; Being present in polarized action in resin, film and the diffusion layer that water contacts, to make water decomposition be H+ and OH-, and their great majority except that the subparticipation load current play regeneration to resin, thereby IX, migration, three processes of electricity regeneration are taken place together; Mutually promote, realized continuous removal ionic process.This method can remove most of salinity in the sewage, and need not to add acid-alkali regeneration, but this technology only limits to the making of pure water, is not suitable for the desalination of high brackish water.
Electro-adsorption technology (EST) is a kind of technology that electrochemical theory is combined with adsorption separation technology; It is through impressed voltage, makes solvability salt and other charge species in the water concentrate and realize a kind of novel water technology of water purification and salt removal in the electrode surface enrichment.When former water flows in the space that cathode and anode is formed; Receive the electrical forces effect; Charged particle in the water (ion, colloidal particle, organism and bacterium etc.) will be respectively to the electrode migration of oppositely charged; By electrode absorption and be stored in the electrostatic double layer, realize separating of charged particle (impurity) and water, de-mineralized water flows out from the other end.When electrode dead electricity or moment reversal connection, be enriched in charged particle on the electrode under the effect of current or electrical forces, coming off from electrode is flushed away, and electrode obtains regeneration.Compare with traditional method, system regeneration need not use any acid, alkali and salts solution, just accomplishes through the discharge of electrode, can not produce secondary pollution; This method energy consumption is lower, operation is simple, get the water rate more than 70%, has good stain resistance and long work-ing life than r-o-.
Generally speaking, the electro-adsorption device requires turbidity less than 5NTU to the not special restriction of chlorine residue in the water inlet, organism, high valence ion usually, and suspension content is lower than 5mg/L, and oil is less than 3ml/L, about pH value 6-9.Therefore, generally adopting sand filtration, fabric filter, security personnel's strainer etc. to carry out pre-treatment gets final product.But along with the carrying out of treating processes, load increases gradually, and regeneration times is frequent, even needs often to change electrode.In addition, the conventional employing adds s.t. and remove that hydrocarbonate prevents that the method security of electro-adsorption device fouling is lower in the former water, and be not easy to operate.
Summary of the invention
The object of the present invention is to provide a kind of device that is used for the sewage desalination.
Another purpose of the present invention is to provide a kind of method of utilizing said apparatus to carry out the sewage desalination.
For realizing above-mentioned purpose, the device that is used for the sewage desalination provided by the invention mainly comprises:
Water collecting basin connects settling tank through the eddy current type line mixer, and this eddy current type line mixer connects the coagulating agent dosing tank;
The water outlet of settling tank connects microfiltration systems, and the water outlet of this microfiltration systems connects the stirring water tank, and this stirring water tank is connected with the Scale inhibitors dosing tank;
The water outlet that stirs water tank connects the electro-adsorption device, and the water outlet of this electro-adsorption device connects tank.
Described device; Wherein, between water collecting basin and the eddy current type line mixer, between settling tank water outlet and the microfiltration systems, stir between water outlet of water tank and the electro-adsorption device, under meter and impeller pump respectively be installed between electro-adsorption device water outlet and the tank; Between eddy current type line mixer and the coagulating agent dosing tank, stir between water tank and the Scale inhibitors dosing tank flow pump and volume pump respectively be installed; The settling tank bottom is equipped with impeller pump.
Described device, wherein, the material of microfiltration systems is a pvdf, and structure is the tubular fibre formula, and membrane pore size is 0.2 μ m.
Described device, wherein, the electro-adsorption device adopts charcoal-aero gel to do electrode materials.
The method of utilizing said apparatus to carry out the sewage desalination provided by the invention, main flow process is:
1) sewage and coagulating agent together get into the eddy current type line mixer, utilize coagulation to remove suspended substance, colloid, a small amount of bacterium and phosphoric acid salt, and reduce turbidity;
2) water outlet of eddy current type line mixer gets into settling tank, and the water outlet of post precipitation is filtered through microfiltration systems and removed macromole dissolved organic matter, coliform, and further reduces turbidity;
3) water outlet after microfiltration systems filters gets into and stirs water tank and add Scale inhibitors, and the sewage after the processing gets into the electro-adsorption device and carries out desalination;
4) water outlet after the desalination gets in the tank.
Described method, wherein, sewage is the urban wastewater treatment firm secondary effluent, COD in the sewage
CrContent below 100mg/L, NH
3-N content is below 15mg/L, and suspension content is below 20mg/L, and specific conductivity is about 1500 μ s/cm, and total dissolved solid is at 800-1200mg/L.
Described method, wherein, coagulating agent is poly-ferric chloride and Poly Dimethyl Diallyl Ammonium Chloride, mass ratio is 5: 1.
Described method, wherein, the pressure of microfiltration systems is 0.05-0.2MPa.
Described method, wherein, Scale inhibitors is a MDC-200 type Scale inhibitors.
Described method, wherein, the electro-adsorption device adopts charcoal-aero gel to do electrode materials, adopts the mode of two-rank module alternate run, and operational process is controlled through PLC automatically, and each module work can realize automaticallying switch with regeneration.
The invention provides can be to the treatment process of sewage deep desalination reuse; Sewage and coagulating agent together get into the eddy current type line mixer; Utilize coagulation to remove impurity and phosphoric acid salt such as suspended substance, colloid, a small amount of bacterium and reduce turbidity, water outlet gets into settling tank, and the post precipitation water outlet is removed macromole dissolved organic matter, coliform etc. through the filteration of hollow fiber microfiltration membrane; And further reduce turbidity; Water outlet gets into Cistern with chemicals adding means, adds Scale inhibitors by volume pump, prevents to separate out fouling after the long-time running of electro-adsorption device from causing difficulty soluble salts such as lime carbonate, magnesiumcarbonate and calcium sulfate to concentrate.Pretreated sewage gets into the electro-adsorption device and carries out desalination, and the producing water ratio of present method can reach more than 75%, and the desalination rate is greater than 80%, and the sewage after the desalination can directly be used for industrial circulating cooling water.
Description of drawings
Fig. 1 is a device synoptic diagram of the present invention.
Primary clustering nomenclature in the accompanying drawing:
1 water collecting basin; 2 settling tanks; 3 microfiltration systems; 4 stir water tank; 5 electro-adsorption devices; 6 tanks; 7 Scale inhibitors dosing tanks; 8 coagulating agent dosing tanks; 9,10 volume pumps; 11,12,13,14,15 impeller pumps; 16,17,18,19,20,21 under meters; 22 eddy current type line mixers; 23 mechanical stirring devices.
Embodiment
The present invention combines pretreatment process with the electro-adsorption technology, the treatment process of a kind of sewage deep desalination reuse is provided, and has further improved the desalination effect.
Please combine Fig. 1, be device synoptic diagram of the present invention: water collecting basin 1 connects settling tank 2 through eddy current type line mixer 22, and this eddy current type line mixer 22 also connects coagulating agent dosing tank 8.
The water outlet of settling tank 2 connects microfiltration systems 3, and the water outlet of this microfiltration systems 3 is connected with the stirring water tank 4 of mechanical stirring device 23, and this stirring water tank 4 is connected with Scale inhibitors dosing tank 7.
The water outlet that stirs water tank 4 connects electro-adsorption device 5, and the water outlet of this electro-adsorption device 5 connects tank 6.Wherein, Between water collecting basin 1 and the eddy current type line mixer 22, between settling tank 2 water outlets and the microfiltration systems 3, stir between the water outlet and electro-adsorption device 5 of water tank 4, under meter 16,18,20,21 respectively be installed between the water outlet of electro-adsorption device 5 and the tank 6, and impeller pump 11,12,13,14.
Between eddy current type line mixer 22 and the coagulating agent dosing tank 8, stir between water tank 4 and the Scale inhibitors dosing tank 7 under meter 17,19 and volume pump 9,10 respectively be installed.
The settling tank bottom is equipped with impeller pump 15.
Sewage deep desalination method of the present invention is following:
The urban wastewater treatment firm secondary effluent gets into water collecting basin 1; Suction function through impeller pump 11 directly gets into eddy current type line mixer 22; By under meter 16 control flow velocitys; Coagulating agent dosing tank 8 carries out coagulating sedimentation in the coagulating agent that volume pump 9 adds acts on eddy current type line mixer 22, the dosage of coagulating agent is by under meter 17 controls.The flocs unit post precipitation that deposition is produced is discharged via the impeller pump 15 of settling tank 2 bottoms.Water outlet gets into microfiltration systems 3 through the suction function of impeller pump 12; By under meter 18 control flow velocitys, the water outlet of microfiltration systems 3 gets into stirs water tank 4, drops into stirring water tank 4 after from Scale inhibitors dosing tank 7, extracting Scale inhibitors by volume pump 10; Stir in the water tank 4 and be provided with mechanical stirring device 23; Guarantee that water inlet and Scale inhibitors mix, the Scale inhibitors dosage is by under meter 19 controls, and the purpose that adds Scale inhibitors is fouling when preventing the long-time running of electro-adsorption device.Water outlet after the processing is carried out desalination through impeller pump 13 suction electro-adsorption devices 5, by under meter 20 control flow velocitys.The de-salted water that produces is pumped in the tank 6 through impeller pump 14, and flow is by under meter 21 controls.The producing water ratio of present method can reach more than 75%, and the desalination rate is greater than 80%, and the sewage after the desalination can directly be used for industrial circulating cooling water.
The sewage of indication of the present invention is from urban wastewater treatment firm secondary effluent, COD
CrContent below 100mg/L, NH
3-N content is below 25mg/L, and suspension content is below 30mg/L, and specific conductivity is about 1500 μ s/cm, and total dissolved solid is about 1000mg/L.
Settling tank of the present invention is a known device.Coagulating agent of the present invention and Scale inhibitors throwing device, by volume pump with in establish the dosing tank that stirs pump and constitute, establish filter screen before the dosing pump, outlet installing pulse buffer, SV should be established corrosion resistant dissolving with a basket net in the dosing tank of dissolved solids.
The material of microfiltration membrane of the present invention is pvdf (PVDF), and structure is the tubular fibre formula, and membrane pore size is 0.2 μ m, and working pressure is 0.05-0.2MPa.
Electro-adsorption device of the present invention, selected charcoal-aero gel are electrode materials, and operating voltage is 1.5V, and flow is 2.0m
3/ h, the total system cycle of operation is realized robotization control by PLC.
Embodiment
Adopt this technology that certain municipal sewage plant's second pond water outlet is carried out desalting treatment as former water, former water pH value is 7.75, and turbidity is 7NTU, and SS is 7.5mg/L, and specific conductivity is 1175 μ s/cm, COD
CrValue is 90mg/L, and TN is 22.13mg/L, and TP is 0.83mg/L, and total salt quantity is 1150mg/L.After former water gets into the settling pond coagulating sedimentation, remove suspended substance and colloidalmaterial through adding poly-ferric chloride, water outlet again after the processing of 0.2 μ m microfiltration membrane suspended substance be lower than 5mg/L, turbidity is less than 2NTU, COD
CrValue goes out water conductivity and reduces to below the 500 μ s/cm less than 50mg/L, and after adding Scale inhibitors, suspension content and turbidity rise to some extent, but do not influence the influent quality of electro-adsorption device.Water outlet gets into electro-adsorption device desalination, and specific conductivity reduces about 80%, and producing water ratio can reach more than 75%, and the desalination rate is greater than 80%, and the sewage after the desalination can directly be used for industrial circulating cooling water.
Claims (10)
1. device that is used for the sewage desalination mainly comprises:
Water collecting basin connects settling tank through the eddy current type line mixer, and this eddy current type line mixer connects the coagulating agent dosing tank;
The water outlet of settling tank connects microfiltration systems, and the water outlet of this microfiltration systems connects the stirring water tank, and this stirring water tank is connected with the Scale inhibitors dosing tank;
The water outlet that stirs water tank connects the electro-adsorption device, and the water outlet of this electro-adsorption device connects tank.
2. device according to claim 1; Wherein, between water collecting basin and the eddy current type line mixer, between settling tank water outlet and the microfiltration systems, stir between water outlet of water tank and the electro-adsorption device, under meter and impeller pump respectively be installed between electro-adsorption device water outlet and the tank;
Between eddy current type line mixer and the coagulating agent dosing tank, stir between water tank and the Scale inhibitors dosing tank flow pump and volume pump respectively be installed;
The settling tank bottom is equipped with impeller pump.
3. device according to claim 1 and 2, wherein, the material of microfiltration systems is a pvdf, and structure is the tubular fibre formula, and membrane pore size is 0.2 μ m.
4. device according to claim 1 and 2, wherein, the electro-adsorption device adopts charcoal-aero gel to do electrode materials.
5. the method for a sewage desalination, main flow process is:
1) sewage and coagulating agent together get into the eddy current type line mixer, utilize coagulation to remove suspended substance, colloid, a small amount of bacterium and phosphoric acid salt, and reduce turbidity;
2) water outlet of eddy current type line mixer gets into settling tank, and the water outlet of post precipitation is filtered through microfiltration systems and removed macromole dissolved organic matter, coliform, and further reduces turbidity;
3) water outlet after microfiltration systems filters gets into and stirs water tank and add Scale inhibitors, and the sewage after the processing gets into the electro-adsorption device and carries out desalination;
4) water outlet after the desalination gets in the tank.
6. method according to claim 5, wherein, sewage is the urban wastewater treatment firm secondary effluent, COD in the sewage
CrContent below 100mg/L, NH
3-N content is below 15mg/L, and suspension content is below 20mg/L, and specific conductivity is about 1500 μ s/cm, and total dissolved solid is at 800-1200mg/L.
7. method according to claim 5, wherein, coagulating agent is poly-ferric chloride and Poly Dimethyl Diallyl Ammonium Chloride, mass ratio is 5: 1.
8. method according to claim 5, wherein, the pressure of microfiltration systems is 0.05-0.2MPa.
9. method according to claim 5, wherein, Scale inhibitors is a MDC-200 type Scale inhibitors.
10. method according to claim 5, wherein, the electro-adsorption device adopts charcoal-aero gel to do electrode materials, adopts the mode of two-rank module alternate run, and operational process is controlled through PLC automatically, and each module work realizes automaticallying switch with regeneration.
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| CN2012102414854A CN102718351A (en) | 2012-07-12 | 2012-07-12 | Device and method for sewage desalting |
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| CN2012102414854A CN102718351A (en) | 2012-07-12 | 2012-07-12 | Device and method for sewage desalting |
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| CN103351074A (en) * | 2013-07-23 | 2013-10-16 | 铸神科技无锡有限公司 | Electrochemical sewage disposal method |
| CN103508597A (en) * | 2013-09-09 | 2014-01-15 | 胡军 | EWTS electrochemical sewage treatment method and system |
| CN103864248A (en) * | 2012-12-11 | 2014-06-18 | 兰州交通大学 | Small-scale electro-absorption desalination apparatus |
| CN104341058A (en) * | 2013-08-01 | 2015-02-11 | 甘肃省环境科学设计研究院 | Medical waste disposal wastewater treatment system |
| CN105548273A (en) * | 2016-02-02 | 2016-05-04 | 河南工程学院 | Electrostatic desalination testing device and method |
| CN105645532A (en) * | 2016-01-06 | 2016-06-08 | 东北大学 | Ammonia nitrogen/total nitrogen treatment device and method |
| CN113149158A (en) * | 2021-03-29 | 2021-07-23 | 河海大学 | System for desalinating brackish water by using pure capacitance deionization technology and method for desalinating brackish water by using system |
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Cited By (9)
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| CN103864248A (en) * | 2012-12-11 | 2014-06-18 | 兰州交通大学 | Small-scale electro-absorption desalination apparatus |
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| CN104341058A (en) * | 2013-08-01 | 2015-02-11 | 甘肃省环境科学设计研究院 | Medical waste disposal wastewater treatment system |
| CN103508597A (en) * | 2013-09-09 | 2014-01-15 | 胡军 | EWTS electrochemical sewage treatment method and system |
| CN105645532A (en) * | 2016-01-06 | 2016-06-08 | 东北大学 | Ammonia nitrogen/total nitrogen treatment device and method |
| CN105645532B (en) * | 2016-01-06 | 2018-08-03 | 东北大学 | A kind of ammonia nitrogen, total nitrogen processing unit and method |
| CN105548273A (en) * | 2016-02-02 | 2016-05-04 | 河南工程学院 | Electrostatic desalination testing device and method |
| CN105548273B (en) * | 2016-02-02 | 2018-03-23 | 河南工程学院 | Electrostatic desalination experimental rig and test method |
| CN113149158A (en) * | 2021-03-29 | 2021-07-23 | 河海大学 | System for desalinating brackish water by using pure capacitance deionization technology and method for desalinating brackish water by using system |
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Application publication date: 20121010 |