CN202358982U - System and pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor - Google Patents
System and pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor Download PDFInfo
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- CN202358982U CN202358982U CN2011202864274U CN201120286427U CN202358982U CN 202358982 U CN202358982 U CN 202358982U CN 2011202864274 U CN2011202864274 U CN 2011202864274U CN 201120286427 U CN201120286427 U CN 201120286427U CN 202358982 U CN202358982 U CN 202358982U
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- 238000001223 reverse osmosis Methods 0.000 claims abstract description 6
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 5
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- 238000003487 electrochemical reaction Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The utility model discloses a system and a pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor. The pretreatment system comprises a cooling treatment device, an electrochemical device, a precipitation and gas flotation device and a multi-media filter in sequence; and the cooling treatment device is connected with the precipitation and gas flotation device and the multi-media filter through the electrochemical device. By using the pretreatment system provided by the utility model, suspended particles and organic matters in the PVC centrifugal mother liquor can be greatly removed, so that stable operation of a subsequent recovery system of an ultrafiltration membrane and a reverse osmosis membrane is guaranteed.
Description
Technical field
The utility model relates to the processing and the reuse of organic industrial sewage, relates in particular to a kind of system of electrochemical treatment PVC centrifuge mother liquor.
Background technology
The PVC centrifuge mother liquor is the main wastewater source during PVC produces, and produces 1 ton of PVC and discharges 4 tons of centrifuge mother liquors approximately.Inorganic pollutant in the PVC centrifuge mother liquor is less relatively, and specific conductivity is on the low side, is a kind of very spent process water of usury usefulness value that has after treatment.But owing to wherein contain the organism of difficult degradations such as the initiator that adds in the polymerization process, dispersion agent, terminator, skimmer, and concentration of suspended particles is high, so the intractability of this type of waste water is than higher.
In recent years, because developing rapidly and wide range of industrial applications of membrane technique adopts two embrane methods of ultra-filtration membrane and reverse osmosis membrane to combine combination procesies such as tradition biochemistry, materialization to become the leading Technology in processing of PVC centrifuge mother liquor and reuse field just gradually.Handle in the technological process of PVC centrifuge mother liquor in two embrane methods, in order to ensure the long-term stability operation of two films, advancing film water matter must strict control.Therefore, the pre-treatment of advancing before the film is had higher requirement, particularly water body turbidity and Z 150PH (PVA) content etc. has the water quality parameter that has a strong impact on to film properties, must strict control.
The pretreated method of a kind of PVC centrifugal mother liquor waste water reuse has been described among the one Chinese patent application CN101857339A; Key step is: waste water carries out the nature cooling in equalizing tank and water quality and quantity is regulated; Introducing coagulation reaction tank; From flowing into the inclined plate sedimentation pond, then waste water is introduced the aerobic biochemical pond and handles then, add mikrobe in the pond and with gac as carrier; Get into second pond through the waste water of aerobic treatment and carry out solid-liquid separation, last supernatant introduces that clean water basin discharge according to owner's needs or as the water source of reuse water.Disclose a kind of pretreatment process of PVC centrifuge mother liquor among the one Chinese patent application CN101343132A, mainly comprised following processing unit: self-cleaning filter, cooling is handled, and coagulant precipitation is handled, ozone oxidation, BAF.More than two kinds of methods all adopt the pre-treatment of biochemical process as two film systems; The PVC centrifugal mother liquor waste water turbidity of handling is about 30-300mg/L; CODCr (COD chromium method) is about 100-400mg/L; And do not relate to for the more abominable PVC centrifuge mother liquor of water quality, these methods are not also mentioned for the removal effect of PVA simultaneously; And the biochemical reaction time is long, and floor space is big, and the residual microbial after the biochemical treatment is brought extra membrane biological pollution risk.
A kind of device of catalytic oxidation treatment PVC waste water is disclosed among the Chinese patent CN201240961Y; It is equalizing tank, intermediate pool, monitoring pond, reuse pool, two-stage settling bowl, filtering basin, the activated carbon pond with add equipment such as catalyzer, oxygenant, neutralizing agent and air-blast system and combine.Though improved reaction efficiency to a certain extent, enlarged coming the limited field of water water quality and quantity, its device structure is complicated, and the chemical agent kind of interpolation is many, consumption is big, and technical process is long, complex operation.
Chinese patent CN1843955A discloses a kind of treatment process of PVC centrifuge mother liquor; Mainly comprise the PVC centrifuge mother liquor is transported to the register temperature adjustment; Then the PVC centrifuge mother liquor after the temperature adjustment is transported to gas and water mixer, equipment for separating liquid from solid successively, wherein equipment for separating liquid from solid comprises sand filtration and ultra-filtration membrane, obtains intermediate liquid and reclaims liquid; Again intermediate liquid is transported to reverse osmosis unit, but obtain direct reuse in PVC polymerization technique water through reverse osmosis membrane filtration.This technology is moved in the ordinary course of things and can be met the demands, but the fluctuation in the PVC polymerization is produced makes when suspended particle rises with organism in its mother liquor, still causes film to pollute, thereby causes frequent film cleaning.
In order to guarantee the steady running of two film systems; Reduce the pollution of film and prolong the matting cycle; So a kind of effective pre-processing of needs system; Make the PVC centrifuge mother liquor advance film and can suspended particle effectively be removed before, make the water body turbidity, simultaneously the macromolecule organic of easy polluted membrane such as the concentration of PVA in the water are reduced to below the 5mg/L less than 10NTU.
The utility model content
Because the above-mentioned defective of prior art; A purpose of the utility model provides a kind of pretreatment system of electrochemical treatment PVC centrifuge mother liquor; Electrochemistry and associated plant thereof through simple and effective; Make the PVC centrifuge mother liquor of high turbidity and PVA content finally reach the into water quality requirement of two film systems, for the smooth running of two film system provides reliable guarantee.Use the pretreatment system of the utility model need not add any chemical agent, level of automation is high, good stability.
The pretreatment system of the electrochemical treatment PVC centrifuge mother liquor of the utility model comprises cooling treatment unit, electrochemical appliance, sedimentation air-floating apparatus and more medium filter successively, and said cooling treatment unit is connected with said more medium filter through electrochemical appliance, sedimentation air-floating apparatus.
In the preferred implementation of the utility model, said cooling treatment unit is a spray column; Said electrochemical appliance is made up of the electrochemical reaction groove, is provided with down spoil disposal and last sludge drainage system.
Electrochemical reaction groove and sedimentation air flotation pool in the electrochemical appliance that the utility model uses are separately installed with the mud discharging valve and scrape the mud system automatically, with the removal macrobead and the flco pollutent wherein of maximum possible.
PVC centrifuge mother liquor through electrochemical treatment gets into the sedimentation air flotation pool, and the residence time is generally 1-5h.
Said more medium filter uses the more medium filter of hard coal and fine sand combination.Have no particular limits for hard coal and fine sand, this area specification commonly used can be satisfied the demand.
In another preferred implementation of the utility model, said sedimentation air-floating apparatus is connected with said more medium filter through pump.
Another purpose of the utility model provides a kind of system of electrochemical treatment PVC centrifuge mother liquor; This system comprises the pretreatment system and the two membrane treatment appts that adopt ultra-filtration membrane and reverse osmosis membrane of the aforesaid electrochemical treatment PVC centrifuge mother liquor of the utility model, and said pretreatment system is connected with two membrane treatment appts through more medium filter wherein.
The pretreatment system of the electrochemical treatment PVC centrifuge mother liquor of the utility model can be with the PVC centrifuge mother liquor through cooling, behind electrochemical treatment, sedimentation air supporting and the multi-medium filtering, making the water body turbidity less than 10NTU, and PVA content is less than 5mg/L.
The use of the pretreatment system of the utility model mainly comprises the steps:
1) cools: said PVC centrifuge mother liquor is cooled through spray column;
2) electrochemical treatment: PVC centrifuge mother liquor after will lowering the temperature is introduced electrochemical appliance, with the flow velocity of 1.1-1.7m/s through the electrochemical reaction groove of battery lead plate is housed;
3) sedimentation air supporting is handled: the PVC centrifuge mother liquor through electrochemical treatment flows into the sedimentation air flotation pool certainly, and wherein the PVC particle of larger particles and light-weight organic pollutant flco are able to remove through sedimentation or come-up;
4) multi-medium filtering: the product water through sedimentation air supporting is handled is imported more medium filter with pump, further removes small particle and sticks pollutent with part.
Because the temperature of PVC centrifuge mother liquor is higher, is generally about 70 ℃.Therefore, at first will said PVC centrifuge mother liquor be cooled through cooling treatment unit such as spray column, preferably the temperature with the PVC centrifuge mother liquor is controlled at below 35 ℃.
Electrochemical appliance in the utility model is to PVC centrifuge mother liquor concentration of suspended particles is high, turbidity is high, electricity is led low this special water body characteristic and designed; Because the electricity of PVC centrifuge mother liquor is led low; Resistance between the pole plate is risen and the voltage rising; This voltage rises and has promoted electric field between pole plate to oxidation, the throwing out of water intermediate ion and pollutent, and the more water electrolytic gas of high-voltage productization and the hydroxyl free radical of oxidisability make its generation air supporting, oxygenizement simultaneously.Therefore, the electrochemical appliance in the utility model is that multiple electrochemical reactions such as current collection flocculation, electric floating and electrooxidation are in the integrated water treatment unit of one.
In the use of the utility model; Electrochemical appliance is under the effect of external voltage; Utilize soluble anode (iron or aluminium) to produce a large amount of positively charged ions, under different pH conditions, metals ion and hydrolytic polymerization product thereof can be brought into play compression double electric layer, absorption charge neutrality and deposition net and catch effect.Simultaneously separate out a large amount of hydrogen microbubbles on the negative electrode, quickened flocculation particulate collision process, density hour will float and separate, and then sinks to separating when density is big, helps to remove rapidly The dissolved and suspended state colloidal compound in the waste water.
The specific conductivity of PVC centrifuge mother liquor is lower, and less than 200 μ s/cm, solution conductivity property is poor usually.In the described electrochemical treatment process of the utility model, in order to overcome higher solution pressure drop, must very high impressed voltage; Below the preferred 48V of impressed voltage, making safety with underwriter's gymnastics is principle.Above-mentioned flocculation and air supporting effect except taking place in electrochemical appliance; Under the higher voltage condition; Thereby oxygen evolution reaction can take place anode surface simultaneously produces direct electrooxidation effect; This especially is difficult to the PVA of biological degradation and flocculating effect difference for The dissolved in the water body and suspended organic matter, has very strong oxidative degradation ability.
In electrochemical treatment process, the pH of PVC centrifuge mother liquor is controlled in the suitable scope, help improving removal efficient with pollutents such as stable suspersion thing and PVA.Therefore, the PVC centrifuge mother liquor that comes out from cooling system gets into before the electrochemical appliance preferably its pH regulator in the 6-9 scope.
In the electrochemical appliance of the utility model, cut down the consumption of energy in order to improve current efficiency, slow down the passivation and the polarization phenomena of battery lead plate simultaneously as far as possible, adopt the mode of regularly switching electrode, preferably the frequency of falling the utmost point is 10-30min; Preferred current density is 1.3-2.1mA/cm
2
The PVC centrifuge mother liquor of indication is meant concentration of suspended particles and organic concentration height among this paper, and the low waste water solution of inorganic particulate content, like turbidity 40-800NTU, PVA content 5-30mg/L, electrical conductivity of solution is less than 200 μ s/cm.
The pretreatment system of the electrochemical treatment PVC centrifuge mother liquor of the utility model need not add any chemical agent and just can obviously reduce the turbidity of PVC centrifuge mother liquor and the content of hardly degraded organic substance PVA wherein, but operate continuously, and the reaction times is short and efficient.Concrete technique effect is following:
1) it is on the low side effectively to handle specific conductivity, and the high PVC centrifuge mother liquor of turbidity and COD content makes the water inlet of the two membrane treatment appts of its final conduct up to standard.
2) need not add any chemical agent and mikrobe; Do not use gac etc. to need the treatment facility of frequent regeneration operation.
3) electrochemical appliance is reasonable in design, and volume is little, takes up an area of to have absolute predominance for a short time; The manual operation step is few.
Description of drawings
Fig. 1 is the synoptic diagram of pretreatment system of the electrochemical treatment PVC centrifuge mother liquor of the utility model.
Embodiment
Embodiment 1
The pretreatment system of the electrochemical treatment PVC centrifuge mother liquor of the utility model comprises chilling spray tower, electrochemical appliance, sedimentation air flotation pool, pump and more medium filter successively, and spray column is connected with more medium filter through electrochemical appliance, sedimentation air flotation pool, pump.
The battery lead plate that electrochemical appliance adopts is an iron plate, and iron plate thickness is 3mm, long 1270mm; Wide 612mm adopts 8 iron plate parallel vertical to be arranged as a unit, and positive negative electricity power supply is connected on the iron plate of right ends; Middle 6 iron plates are induction electrode; Water inlet is from bottom to top flow through battery lead plate intermediary runner and under effect of electric field, is produced electrochemical reaction, and the voltage of use changes with current density, generally between 35～48V.
Electrochemical reaction groove and sedimentation air flotation pool thereafter are separately installed with the mud discharging valve and scrape the mud system automatically.
More medium filter adopts the more medium filter of hard coal and the combination of quartzy fine sand, and wherein the hard coal particle diameter is at 1.6～2mm, and filtering layer height 1.2m, quartzy fine sand particle diameter be at 0.5～0.8mm, filtering layer height 0.8m.
Embodiment 2
The PVC centrifuge mother liquor is the waste water that suspension method PVC polymerization production process produces, and the PVC centrifuge mother liquor among the embodiment of this paper is the water body of higher turbidity and higher PVA content.Main water-quality guideline is following: temperature 65-70 ℃, and turbidity 300-600NTU, contained PVA concentration 10-20mg/l.
The PVC centrifuge mother liquor comes the about 65-70 of water temp ℃, at first is pumped into spray column and cools, and leaving water temperature(LWT) is 35 ℃, regulates pH simultaneously in the 6-9 scope.From flowing into electrochemical appliance, the rate of flow of fluid of polar board surface is 1.3m/s, current density 2.0mA/cm then
2, be 30min polar period.Electrochemical treatment is produced water and is flowed into sedimentation air supporting treatment unit certainly, residence time 2h, and macrobead and lightweight suspension thing are able to remove during this period.Sedimentation air supporting product water is input to more medium filter through pump and further removes organic impurity.
Water quality contrast before and after table 3 is handled
More than describe the preferred embodiment of the utility model in detail.The ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technician in the art according to the design of the utility model on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection domain by claims.
Claims (5)
1. the pretreatment system of an electrochemical treatment PVC centrifuge mother liquor; It is characterized in that: comprise cooling treatment unit, electrochemical appliance, sedimentation air-floating apparatus and more medium filter successively, said cooling treatment unit is connected with said more medium filter through electrochemical appliance, sedimentation air-floating apparatus.
2. the pretreatment system of electrochemical treatment PVC centrifuge mother liquor according to claim 1 is characterized in that: said cooling treatment unit is a spray column; Said electrochemical appliance is made up of the electrochemical reaction groove, is provided with down spoil disposal and last sludge drainage system.
3. the pretreatment system of electrochemical treatment PVC centrifuge mother liquor according to claim 2 is characterized in that: said electrochemical reaction groove and sedimentation air flotation pool thereafter are separately installed with the mud discharging valve and scrape the mud system automatically.
4. the pretreatment system of electrochemical treatment PVC centrifuge mother liquor according to claim 1 is characterized in that: said sedimentation air-floating apparatus is connected with said more medium filter through pump.
5. the system of an electrochemical treatment PVC centrifuge mother liquor; It is characterized in that: the pretreatment system that comprises the described electrochemical treatment PVC centrifuge mother liquor of one of claim 1-4; With the two membrane treatment appts that adopt ultra-filtration membrane and reverse osmosis membrane, said pretreatment system is connected with said pair of membrane treatment appts through more medium filter wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202864274U CN202358982U (en) | 2011-08-08 | 2011-08-08 | System and pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202864274U CN202358982U (en) | 2011-08-08 | 2011-08-08 | System and pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor |
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| Publication Number | Publication Date |
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| CN202358982U true CN202358982U (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202864274U Expired - Lifetime CN202358982U (en) | 2011-08-08 | 2011-08-08 | System and pretreatment system for electrochemical treatment of PVC (Polyvinyl Chloride) centrifugal mother liquor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923888A (en) * | 2011-08-08 | 2013-02-13 | 凯膜过滤技术(上海)有限公司 | Method for electrochemical treatment of PVC centrifugation mother liquor and pretreatment system |
| CN112499851A (en) * | 2020-12-01 | 2021-03-16 | 华东理工大学 | Organic wastewater treatment method and device based on electrooxidation phase transfer |
-
2011
- 2011-08-08 CN CN2011202864274U patent/CN202358982U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923888A (en) * | 2011-08-08 | 2013-02-13 | 凯膜过滤技术(上海)有限公司 | Method for electrochemical treatment of PVC centrifugation mother liquor and pretreatment system |
| CN102923888B (en) * | 2011-08-08 | 2016-01-13 | 凯膜过滤技术(上海)有限公司 | A kind of method of electrochemical treatment PVC centrifugation mother liquor |
| CN112499851A (en) * | 2020-12-01 | 2021-03-16 | 华东理工大学 | Organic wastewater treatment method and device based on electrooxidation phase transfer |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |