CN105884093A - High-alkalinity PTA reclaimed water reuse process - Google Patents

High-alkalinity PTA reclaimed water reuse process Download PDF

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CN105884093A
CN105884093A CN201610423876.6A CN201610423876A CN105884093A CN 105884093 A CN105884093 A CN 105884093A CN 201610423876 A CN201610423876 A CN 201610423876A CN 105884093 A CN105884093 A CN 105884093A
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water
pta
alkalinity
edr
treatment
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谭俊
方伟娟
马樑
楼永通
陈良
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HANGZHOU LANRAN ENVIRONMENT TECHNOLOGY Co Ltd
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HANGZHOU LANRAN ENVIRONMENT TECHNOLOGY Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/203—Iron or iron compound
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/206—Manganese or manganese compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention

Abstract

The invention provides a high-alkalinity purified terephthalic acid (PTA) reclaimed water reuse process. The high-alkalinity PTA reclaimed water reuse process is characterized in that coagulation treatment, manganese sand filtering treatment, ultra-filtration treatment and frequently changing pole electrodialysis (EDR) treatment are sequentially conducted on high-alkalinity PTA reclaimed water, fresh water obtained through the EDR treatment is partially for industrial reuse, and concentrated water is directly discharged. The high-alkalinity PTA reclaimed water reuse process has the actual advantages that the process is reasonable in combination, adopts coagulation and manganese sand filtering to perform pretreatment and effectively reduces the turbidity and heavy metal ion concentration of the reclaimed water; an ultra-filtration process is adopted, and suspended particles, colloid and microbes in the water are further removed; the EDR technique has higher permeation rate and desalination performance to the high-alkalinity reclaimed water; the investment and operation costs are reduced; after the high-alkalinity PTA reclaimed water is subjected to desalination treatment, the water quality of the fresh water reaches the cooling water quality standards in national Urban Wastewater Recycling Industrial Water Quality (GB/T19923-2005), waste is turned into wealth, resourceful utilization of the reclaimed water is achieved; the water quality of the concentrated water reaches the Level-A Standard of Urban Sewage Treatment Plant Pollutant Discharge Standard (GB18918-2002), and the concentrated water is directly discharged out.

Description

A kind of high alkalinity PTA Treated sewage reusing technique
Technical field
The present invention relates to the technology that in a kind of high alkalinity PTA, recycling of water resource utilizes.
Background technology
China p-phthalic acid (PTA) industry is started in the eighties in 20th century, and the later stage nineties steps into the initial development stage, and since two thousand, along with the fast development of downstream polyester dacron industry, China PTA industry progresses into Fast Growth period.The production capacity of China PTA in 2005 only has 640.5 ten thousand tons, within 2014, reaches 4316.0 ten thousand tons.Meanwhile, concentration is compared again in the application of PTA, and the PTA of more than 90% is used for producing polyethylene terephthalate (being called for short polyester, PET) in the world.
P-phthalic acid (PTA) is important chemical products and chemical fibre raw material, is widely used in and the various aspects of the national economy such as chemical fibre, light industry, electronics, building.China is that the yield of the raw materials for production p-phthalic acid (TA) of experimental branch line big country, only PTA just accounts for the 30% of Gross World Product, and PTA produces one of waste water major source of pollutant having become as water environment.P-phthalic acid (PTA) production technology needs to use substantial amounts of deionized water, carries out the refined production of high-purity, and the desalted water of 1 ton of PTA consumption is generally 3～4 tons.
In PTA, water is the water outlet after biochemical treatment of the PTA waste water, containing pollutant such as float, foundry loam, antibacterials, its water quality has the features such as higher basicity, more heavy metal ion kind, more float (SS), wherein salt composition is mainly carbonate and bicarbonate, salt content is about 1000-3000mg/L, corresponding basicity is about 1500-3500mg/L, and heavy metal ion kind includes CO2+、Mn2+、Fe2+, CO2+、Mn2+≤2mg/L、Fe2+≤ 0.5mg/L, SS≤20mg/L, COD≤50mg/L.
In recent years, PTA manufacturing enterprise is using water wisely, reduces blowdown flow rate, the most actively attempts, investigates various technology of middle water recycle, select practicable Treated sewage reusing scheme.In chemical fibre industry enterprise PTA, water discharge water meets first discharge standard at present, but owing to discharge of wastewater water salinity is higher, and containing metal ions such as cobalt, manganese, ferrum, wherein salinity is mainly carbonate and bicarbonate, use general conventional processing technique to be difficult to the removing to salt, thus be also unable to reach Treated sewage reusing standard.
All main selection the such as China Patent Publication No. CN101134628, CN105037131A uses ultrafiltration, reverse osmosis bi-membrane method technique to carry out the reuse of water in PTA, first, although the pollutant such as oil removal, foundry loam can be effectively removed in ultrafiltration, but to CO2+、Mn2+、Fe2+There is no crown_interception Deng metal ion, under the conditions of high alkalinity, easily cause film scale problems in subsequent film technique, the CO of the most certain content2+、Mn2+、Fe2+Deng the easy breed bacteria of metal ion, easily film is polluted.Secondly, using reverse osmosis process, owing to basicity is high, stifled film risk is big, and operating cost is higher simultaneously；Finally, using reverse-osmosis treated, dense water cycles of concentration is relatively low, otherwise easily causes row COD ＞ 50mg/L outside dense water, is unsatisfactory for " urban wastewater treatment firm pollutant emission standard one-level A standard ", in this case, causes Treated sewage reusing rate relatively low.
Summary of the invention
The technical problem to be solved is to provide a kind of method of high alkalinity PTA Treated sewage reusing, it is possible to water in high alkalinity PTA is carried out integrated treatment, using water wisely, reduce blowdown flow rate, realize cleaning to produce, can not only effectively reduce environmental pressure, and middle water can be made to realize recycling.To this end, the present invention is by the following technical solutions:
The technique of high alkalinity PTA Treated sewage reusing, it is characterised in that it carries out following steps process successively to water in high alkalinity PTA:
1), coagulation and filtration with manganese sand system pretreatment；
2), ultrafiltration system processes (UF)；
3), frequently pole-reversing electroosmosis system processes (EDR).
Using on the basis of technique scheme, the present invention can also use technical scheme further below:
In step (1), by coagulation and filtration with manganese sand pretreatment, manganese, ferrum, cobalt ion content clearance more than 90%, middle water turbidity are reduced by more than 80%；After step (1) processes, water quality parameter is: manganese, iron concentration ＜ 0.01mg/L, concentration of cobalt ions ＜ 0.05mg/L, SS ＜ 2mg/L.Effective control to concentration of metal ions, can solve metal ion scale problems, subsequent handling bacteria growth problems, membrane pollution problem etc. under the conditions of high alkalinity, it can be ensured that ultrafiltration and electrodialysis are more efficient, stable operation.
In step (1); in coagulation selection of auxiliary aluminium polychlorid (PAC), polyacrylamide (PAM), plant polyphenol etc. one or more; the specific aim of coagulation auxiliary agent uses; micelle and coagulant effect can be made; by the mechanism such as compression double electric layer and charge neutrality; lose or reduce stability, generate microgranule or micro-wadding grain.Manganese sand filter entirety uses stainless steel, there is good decay resistance, device adds the media such as coarse sand, fine sand, anthracite, manganese sand in an orderly manner, the pollutant such as the microgranule in water, colloid, metal ion (ferrum, manganese, cobalt), Organic substance are had obvious removal effect.
In step (2), the ultrafiltration response rate controls more than 95%, removes the suspended particulates in water, colloid, microorganism further, and clearance reaches more than 99%, water quality SS ＜ 0.1mg/L after step (2) processes.Effective control of SS, can fully meet EDR influent quality requirement, it is ensured that EDR is continuous, stable operation, reduces fouling membrane risk.
The membrane module that ultrafiltration system is used uses polymeric hollow fibrous material, membrane material is selected from Kynoar (PVDF), polyacrylonitrile (PAN), polyamide (PA), its surface has the active layer of densification, inside has the network supporting layer of some strength, is allowed to membrane module entirety and has good mechanical performance and chemical-resistant stability.So, in processing high alkalinity PTA during water, can run steadily in the long term, there is longer service life.
In step (3), EDR produces water as water source with ultrafiltration, after using the continuous desalination of multistage EDR, electrodialysis fresh water production water direct reuse is in leading portion PTA synthesis and production process, electrodialytic dense water side, the dense water of 30-80% is circulated operation, meets Treated sewage reusing rate >=80%, reasonably reclamation rate design, has good economic benefit.
EDR electrodialysis frequently pole-reversing can effectively suppress the scale problems that in high alkalinity PTA, water produces in electrodialysis concentration process, in water, charged colloid and the zoogleic direction of motion are frequently switched, reduce the attachment on face of the glutinous mud material and accumulation, reduce organic contamination probability, there is good automatic cleaning action；
Electrode self can be cleaned by the acid that anode chamber produces, and can overcome the precipitation on minus plate；EDR is higher than conventional electrodialysis plant operation electric current, and former Water Sproading rate is high.
EDR electrodialysis system can be divided into three-stage electrodialysis to process: first order electrodialysis process uses the alloy film that consistency is higher, the second level and the third level to use common heterogeneous membrane；First order electrodialysis fresh water production water enters second level electrodialysis and continues desalting processing, and the first order dense water 30-80% is back to the dense water storage tank of one-level and continues cycling through, remaining outer row；Electrodialysis fresh water production water in the second level enters third level electrodialysis and continues desalting processing, and wherein second level electrodialysis and third level electrodialysis share dense water storage tank, and 30-80% is back to two grades of dense water storage tanks and circulates continuously, remaining outer row.Third level electrodialysis fresh water production water carries out PTA synthesis and production process reuse, dense water 30-60% circulates continuously, dense water remainder COD≤50mg/L after process, the indexs such as SS≤1mg/L meet dense water water quality and meet " urban wastewater treatment firm pollutant emission standard one-level A standard " (GB18918-2002), can directly outer arrange.
Owing to using technique scheme, present invention process proposes a kind of high alkalinity PTA Treated sewage reusing method, initially with coagulation and filtration with manganese sand pretreatment, on the one hand can effectively reduce concentration of metal ions, water turbidity, on the other hand can reduce the pollution risk of film in subsequent film technique；Next uses ultrafiltration (UF) to process, and can effectively go oil removal, mud, antibacterial etc., it is ensured that electrodialysis influent quality requirement, it is ensured that electrodialysis runs steadily in the long term；Frequently pole-reversing electroosmosis (EDR) is finally used to process, water in high alkalinity is had higher transmission rates and desalting performance, and EDR has automatic electrode inversing function, has the most excellent automatic cleaning action, under the conditions of high alkalinity can being efficiently solved, the easy scale problems of water quality.Using EDR technique, fresh water Organic substance does not migrates, dense water COD≤50mg/L, and cycles of concentration is more than 80% up to 10-20%, Treated sewage reusing rate.The most each process combination is reasonable, and matching degree is higher, and EDR, for reverse osmosis, has lower energy consumption.Concrete technique effect is as follows:
(1), coagulation, the preprocess method of filtration with manganese sand are used, significantly reduce content and the suspended solid total amount of the heavy metal ion such as manganese, ferrum, cobalt in water in PTA, prevent pollution and the blocking of film, extend the experimental lifetime of ultrafilter membrane, also EDR is met to concentration of metal ions requirement in water quality so that middle water obtains more efficient, stable process in follow-up pair of integration technique of membrane processes.
(2) impurity such as suspended particulates, in the removable water of ultrafiltration membrane technique, colloid, microorganism, are effectively reduced raw water turbidity, it can be ensured that EDR device efficiently, stable operation.Ultrafilter membrane uses polymeric hollow fibrous material, has good chemical-resistant stability, has longer service life.
(3), electrodialytic technique is higher and stable to the removal efficiency of inorganic salt, COD does not migrates, and meets chemical fiber waste water reuse requirement, and fresh water reaches reuse index after realizing the removing of inorganic salt, and dense water only has that inorganic salt concentrates and COD increases hardly, meet local environmental emission standard.EDR electrodialysis frequently pole-reversing can effectively suppress the scale problems that in high alkalinity PTA, water produces in electrodialysis concentration process, has good automatic cleaning action.
(4), membrane separation technique is utilized, have efficiently, room temperature runs, without characteristics of energy saving such as phase transformations, high alkalinity salinity in water in PTA is separated, while accomplishing that cleaning produces, also there is the advantage of relatively low cost of investment and operating cost, final less expensive solve a PTA Treated sewage reusing difficult problem for enterprise, save enterprise water use, reduce blowdown flow rate, significantly reduce environmental pressure, realize industrialized production, create real economy benefit.
To sum up, during the present invention can realize, water realizes recycling, saves enterprise water use, reduces blowdown flow rate, can not only effectively reduce environmental pressure, and enterprise can realize cleaning and produce, and creates real economy benefit.
Accompanying drawing explanation
Fig. 1 is the flow chart of high alkalinity PTA Treated sewage reusing technique of the present invention.
Detailed description of the invention
Referring to the drawings, water in the high alkalinity PTA of entrance present invention process is first carried out the pretreating process of coagulation and filtration with manganese sand, coagulation selection of auxiliary aluminium polychlorid (PAC), polyacrylamide (PAM), by the bulky grain float in coagulating sedimentation water and mechanical admixture etc..Manganese sand filter entirety uses stainless steel, device adds coarse sand, fine sand, anthracite, the materials such as manganese sand, most manganese can be removed by filtration with manganese sand, the heavy metal ion such as ferrum and cobalt, to manganese, ferrum, cobalt ion content clearance more than 90%, middle water turbidity reduces by more than 80%, after process, water quality parameter is: manganese, iron concentration ＜ 0.01mg/L, concentration of cobalt ions ＜ 0.05mg/L, SS ＜ 2mg/L, prevent pollution and the blocking of film in subsequent technique, ensure that ultrafiltration and electrodialytic membranes integrated system are efficient, steady and continuous is run.
Manganese sand produces water and enters ultrafiltration system, utilizes ultrafilter membrane to remove small granular suspended matters, microorganism and colloid.The response rate of ultrafiltration can be controlled in more than 95%, and the clearance of SS can be reached more than 99%.Ultra-filtration water water quality reaches following index: basicity is 1500-3500mg/L, SS ＜ 0.1mg/L, COD≤50mg/L, manganese, iron concentration ＜ 0.01mg/L, concentration of cobalt ions ＜ 0.05mg/L.
Wherein hyperfiltration membrane assembly uses hollow-fibre membrane, and wherein membrane material is selected from Kynoar, has good mechanical performance and chemical-resistant stability, can run steadily in the long term, has longer service life.
Frequently pole-reversing electroosmosis (EDR) system, with ultrafiltration product water as water source, carries out continuous desalting processing to it, electrodialysis fresh water production Water circulation in PTA synthesis and production process, electrodialytic dense water side, keep 30-80% circular flow, it is besides arranged, and meets Treated sewage reusing rate >=80%.
EDR electrodialysis system is divided into three-stage electrodialysis to process: first order electrodialysis process uses the alloy film that consistency is higher, the second level and the third level to use common heterogeneous membrane；First order electrodialysis fresh water production water enters second level electrodialysis and continues desalting processing, and the first order dense water 30-80% is back to the dense water storage tank of one-level, and it is besides arranged；Electrodialysis fresh water production water in the second level enters third level electrodialysis and continues desalting processing, and wherein second level electrodialysis and third level electrodialysis share dense water storage tank, and 30-80% is back to two grades of dense water storage tanks, and it is besides arranged；Third level electrodialysis fresh water production Water circulation is back to dense water storage tank in TA synthesis and production process, dense water 30-80%, and it is besides arranged.
Hereinafter above-mentioned double film processing systems are described further:
1. ultrafiltration (UF) system
In present invention process, ultrafiltration system has the features such as high accuracy, long-life, big flux and low cost, running uses the method for operation of cross flow filter, dense water refluxes, and it is aided with frequent gas and water backwash technique, the aquifer yield stable to ensure membranous system, and improve the water use efficiency of system, also enable the system to continuous high-efficient, stable operation.
Ultrafiltration system includes the equipment such as pre-filtrating equipment, ultrafiltration apparatus, backwash oxidant chemicals dosing plant and backwashing pump.Ultra filtration membrane technology has that floor space is little, effluent quality good and stable, automaticity high.Native system hyperfiltration membrane assembly uses polymeric hollow fibrous material, there is good mechanical performance and chemical-resistant stability, its surface has the active layer of densification, supporting layer is spongy network structure, therefore pressure, antipollution, service life are long, and can ensure for a long time to produce water water quality, colloid, small particle, turbidity, microorganism, larger molecular organics etc. are had good interception capacity, produces water water quality and meet electrodialysis inflow requirement.
Ultrafiltration apparatus is designed with modularized design, simple to operate, with low cost, produces water quality stabilizing.
Frequently pole-reversing electroosmosis (EDR) system
Electrodialysis is that the charged electrolyte in water and neutral species are separated under DC electric field power effect and reach a kind of membrane separation plant of the expection purpose such as desalination, concentration by a kind of selective penetrated property utilizing film.The critical piece of electrodialyzer is anions and canons exchange membrane, dividing plate and electrode three part.Fresh water water circuit system, dense water water circuit system are supplied by water pump with the liquid stream of pole water water circuit system, mix mutually, and make it be distributed at electrodialysis membrane stack inner homogeneous by the cloth of particular design, water collecting structure, steady flow.From the alternating current of power supply network supply, rectified device becomes unidirectional current, electrode introduce electrodialysis membrane stack, through the electrochemical reaction on solution electrode interface, completes to be converted into the process of ionic conduction by electronic conduction.
Frequently pole-reversing electrolysis-electrodialysis (EDR) device, at regular intervals, positive and negative electrode polarity is mutually switched, and the denseest water compartment and fresh water compartment are exchanged the most accordingly, play and automatically clean electrodialysis-ion exchange film and the dirt of electrode surface formation, to guarantee that salt rejection rate is steady in a long-term.Common electric drive membrane separator is in operation and is difficult to break away from the puzzlement of dirt, it is impossible to ensure steady in a long-term operation.For " antiscale ", the method for employing has pretreatment, pre-softening, dense water acid adding or anti-slope agent, control limit once to run；The method of " scale removal " has pickling, backwash, medicament to clean so that unpicking and washing.The employing of these methods, all causes certain loss in economic benefit." pole " has antiscale and scale removal two kinds effect concurrently, is a kind of method of electric drive membrane separator self cleaning function." pole " has given full play to the effect of antiscaling, descaling, has reached the purpose that electrodialysis relies on self to clean, and is to ensure that its simply effective ways run steadily in the long term.

Claims (3)

1. high alkalinity PTA Treated sewage reusing technique, it is characterised in that it carries out following steps process successively to water in described PTA:
(1) coagulation and filtration with manganese sand pretreatment；
(2) ultrafiltration (UF) system processes；
(3) frequently pole-reversing electroosmosis (EDR) system processes.
2. high alkalinity PTA Treated sewage reusing technique as claimed in claim 1, it is characterised in that:
In step (1), coagulation and filtration with manganese sand pretreatment are to manganese, ferrum, cobalt ion content clearance more than 90%, haze reduction more than 80%；After step (1) processes, water quality parameter is: manganese, iron concentration ＜ 0.01mg/L, concentration of cobalt ions ＜ 0.05mg/L, SS ＜ 2mg/L；
In step (2), the ultrafiltration response rate controls more than 95%, and clearance further to suspended solid total amount can reach more than 99%, and after step (2) processes, water quality parameter is: SS ＜ 0.1mg/L, COD≤50mg/L；
The membrane module material that ultrafiltration system is used is polymeric hollow fiber, and membrane material is selected from Kynoar (PVDF), polrvinyl chloride (PVC), polyamide (PA).
3. high alkalinity PTA Treated sewage reusing technique as claimed in claim 2, it is characterized in that: in step (3), water is produced as water source with ultrafiltration, use the continuous desalinating process of multistage EDR, final EDR fresh water production water meets cooling water water standard in " urban sewage reutilization industry water standard " (GB/T19923-2005), carrying out Treated sewage reusing, dense water water quality meets " urban wastewater treatment firm pollutant emission standard one-level A standard " (GB18918-2002), outer row.
CN201610423876.6A 2016-06-15 2016-06-15 High-alkalinity PTA reclaimed water reuse process Pending CN105884093A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN107572697A (en) * 2017-09-26 2018-01-12 杭州蓝然环境技术股份有限公司 A kind of viscose rayon spent lye resource utilization method
CN111348795A (en) * 2020-03-26 2020-06-30 福州大学 Electrodialysis-based PTA refining wastewater resource recycling device and method
CN111847795A (en) * 2020-07-31 2020-10-30 新疆中泰创新技术研究院有限责任公司 System and method for recycling and treating PTA reclaimed water

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