CN109626650A - A kind of chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system - Google Patents
A kind of chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system Download PDFInfo
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- CN109626650A CN109626650A CN201910030287.5A CN201910030287A CN109626650A CN 109626650 A CN109626650 A CN 109626650A CN 201910030287 A CN201910030287 A CN 201910030287A CN 109626650 A CN109626650 A CN 109626650A
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- water
- waste water
- processing unit
- calcium carbide
- carbide slag
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a kind of chlor-alkali enterprises waste water circulation comprehensives to utilize Zero discharging system, including salt dissolving water distributing trough, ionic exchange membrane caustic, produce water water intaking pond, calcium carbide slag bath, PVC device and environmental protection station, the salt dissolving water distributing trough and calcium carbide slag bath are connected with production water water intaking pond, the salt dissolving water distributing trough is connected with ionic exchange membrane caustic circulation, the calcium carbide slag bath is connected with PVC device and environmental protection station, it further include time sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing unit, the secondary sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing unit are connected with PVC device, the wasted water outlet of polymeric wastewater processing unit and mercury-containing waste water processing unit is connected with calcium carbide slag bath.The chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system to design rationally, in source progress waste water dual treatment circulation comprehensive utilization, reduction discharge of wastewater or close to " zero-emission ", upgrading synergy, and puts into low with operation cost.
Description
Technical field
The present invention relates to chloro alcali wastewater recycle utilization technology fields, more particularly, to a kind of chlor-alkali enterprises waste water circulation comprehensive
Utilize Zero discharging system.
Background technique
There is chlor-alkali enterprises positioned at the Changjiang river bank water intaking to facilitate advantage, but also have huge ecological, environmental protective pressure.With
Country and people environmental protection is increasingly paid attention to, make the green graceful the Changjiang river of the clear bank of water comprehensively, this is to the chlor-alkali enterprises according to river dado
Wastewater treatment requires also higher and higher.
Mostly chlor-alkali enterprises cycling utilization of wastewater processing at present is that the waste water of environmental protection station discharge is carried out reverse osmosis technology processing,
90% infiltration water is can be back to use intake or recirculated water as supplement water, is technically feasible, other 10% left sides
Right concentrated water is evaporated crystallization.But due to investing larger (needing more than 2,500 ten thousand yuan), operating cost is higher, from the warp of waste water recycling
Angle of helping is not cost-effective.Therefore it is uneconomic for doing " zero-emission " from end recycling waste water.
Summary of the invention
In view of the shortcomings of the prior art, technical problem to be solved by the invention is to provide a kind of chlor-alkali enterprises waste water circulation is comprehensive
It closes and utilizes Zero discharging system, utilized from source processing cycle, be realized with a low cost chlor-alkali enterprises wastewater zero discharge, upgrading synergy.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is as follows:
The chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system, including salt dissolving water distributing trough, ionic exchange membrane caustic, life
Water water intaking pond, calcium carbide slag bath, PVC device and environmental protection station are produced, the salt dissolving water distributing trough and calcium carbide slag bath are fetched water with production water
Pond is connected, and the salt dissolving water distributing trough is connected with ionic exchange membrane caustic circulation, and the calcium carbide slag bath and PVC device and environmental protection station are equal
It is connected, further includes time sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing unit, the secondary sodium waste water
Processing unit, polymeric wastewater processing unit and mercury-containing waste water processing unit are connected with PVC device, polymeric wastewater processing unit
It is connected with the wasted water outlet of mercury-containing waste water processing unit with calcium carbide slag bath.
Further, further include acetylene generator, the polymeric wastewater processing unit and mercury-containing waste water processing unit it is useless
Water liquid outlet passes through acetylene generator and is connected with calcium carbide slag bath.
It further include triolefin and four alkane devices, the triolefin tail water that triolefin and four alkane devices generate is delivered to calcium carbide slag bath, calcium carbide
The supernatant of slag bath is delivered in triolefin and four alkane devices, is formed and is recycled；Pump waste water conveys in triolefin and four alkane devices
To environmental protection station.
It further include CPE device, the CPE device is connected with environmental protection station, and CPE device is connected with calcium carbide slag bath.
Regeneration sour water, buck, light salt brine containing nitre, steam condensate (SC), the pump generated in the ionic exchange membrane caustic is cold
But water flows back and is delivered in salt dissolving water distributing trough.
The acetylene cleaning time sodium waste water generated in the PVC device is flow in time sodium wastewater treatment equipment, and the secondary sodium is useless
Treated that water is back in PVC device for water treatment facilities, and redundance returns to calcium carbide slag bath.
Compared with prior art, the present invention having the advantage that
The chlor-alkali enterprises waste water circulation comprehensive is designed rationally using Zero discharging system, is carried out waste water dual treatment in source and is followed
Ring comprehensive utilization, reduces discharge of wastewater or close to " zero-emission ", upgrading synergy, and puts into low with operation cost.
Detailed description of the invention
Content expressed by each width attached drawing of this specification and the label in figure are briefly described below:
Fig. 1 is Zero discharging system schematic diagram of the present invention.
Specific embodiment
Below against attached drawing, by the description of the embodiment, making to a specific embodiment of the invention further details of
Explanation.
As shown in Figure 1, the chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system, including salt dissolving water distributing trough, ionic membrane
Soda equipment, production water water intaking pond, calcium carbide slag bath, PVC device, environmental protection station, acetylene generator, triolefin and four alkane devices, CPE dress
It sets and public work device.
Produce water water intaking pond can use Yangtze River Water, salt dissolving water distributing trough and calcium carbide slag bath and public work device with production water
Pond of fetching water is connected, the water in production water water intaking pond after purified treatment circulation conveying to public work device, ion film caustic soda
The devices such as device, PVC device, triolefin and four alkane devices, CPE device and harbour use.
Salt dissolving water distributing trough is connected with ionic exchange membrane caustic circulation, regeneration sour water, the alkali generated in ionic exchange membrane caustic
Water, light salt brine containing nitre, steam condensate (SC), pump cooling water flow back and are delivered in salt dissolving water distributing trough, are recycled.
The chlor-alkali enterprises waste water circulation comprehensive using Zero discharging system further includes time sodium wastewater treatment equipment, at polymeric wastewater
Manage device and mercury-containing waste water processing unit, secondary sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing
Device is connected with PVC device, the wasted water outlet and calcium carbide slag bath of polymeric wastewater processing unit and mercury-containing waste water processing unit
It is connected.
The acetylene cleaning time sodium waste water generated in the PVC device is flow in time sodium wastewater treatment equipment, and the secondary sodium is useless
Treated that water is back in PVC device for water treatment facilities, and redundance returns to calcium carbide slag bath.
The polymeric wastewater that PVC device generates is flow in polymeric wastewater processing unit, and polymeric wastewater processing unit generates pure
Water is flow in PVC device, and the mercury-containing waste water that PVC device generates is flow in mercury-containing waste water processing unit, polymeric wastewater processing unit
Pass through acetylene generator with the wasted water outlet of mercury-containing waste water processing unit to be connected with calcium carbide slag bath.
It further include triolefin and four alkane devices, the triolefin tail water that triolefin and four alkane devices generate is delivered to calcium carbide slag bath, calcium carbide
The supernatant of slag bath is delivered in triolefin and four alkane devices, is formed and is recycled；Pump waste water conveys in triolefin and four alkane devices
To environmental protection station.
CPE device is connected with calcium carbide slag bath, and the organic acidity waste water that CPE device generates is delivered in calcium carbide slag bath, CPE dress
It sets and is connected with environmental protection station, other waste water that CPE device generates, which are flow in environmental protection station, to be handled.Harbour waste water also flow to environmental protection station, ring
The water for protecting station purified treatment, which is delivered in production water water intaking pond, to be recycled, and cost is reduced.
This system be utilized for the chlor-alkali enterprises waste water circulation comprehensive for possessing ion film caustic soda and calcium carbide process PVC device and
Zero-emission field.(such as regenerated acid and alkali waste water, contains nitre at pump cooling water to the main all kinds of waste water including ionic exchange membrane caustic
Light salt brine, steam condensate (SC)) etc. empty back into salt dissolving water distributing trough, after salt dissolving refinement treatment, be recycling in ion film caustic soda
Device itself reaches present apparatus wastewater zero discharge；All kinds of waste water (secondary sodium waste water, polymeric wastewater, mercury-containing waste water etc.) of PVC device
After carrying out dual treatment, it is recovered to acetylene generator or calcium carbide slag bath and PVC device itself is comprehensively utilized, pump cooling water
Using recirculated water, to reach present apparatus wastewater zero discharge.Fine Chemistry Wastewater such as trichloro ethylene, tetrachloroethanes, CPE device
For organic acidity Sewage treatment to calcium carbide slag bath, other pump cooling waste waters, public work waste water, harbour waste water empty back into environmental protection
It stands, after processing reaches production water index, empties back into production water water intaking pond, recycle reaching zero-emission.By with
Upper method, circulation comprehensive utilization and wastewater zero discharge can be reached by making chlor-alkali enterprises waste water all.Separately since each apparatus system disappears
Consumption and the insufficient production water of water evaporation are still supplemented by Yangtze River Water.Reduce discharge of wastewater or close to " zero-emission ", upgrading synergy, and
It puts into low with operation cost.
Preferred embodiment are as follows:
In order to recycle waste water using low fare paths, discharge of wastewater is reduced or close to " zero-emission ", upgrading synergy, book hair
It is bright to use source processing, waste water dual treatment recovery technology, and the comprehensive utilization of waste water is effectively performed, it is close to reach waste water
" zero-emission " purpose.
Ionic exchange membrane caustic part: ionic membrane regenerative wastewater main regeneration is into acid waste water and alkaline waste water group at present
At, can in underground pond and, if some alkali can be supplemented in acidity, be recovered to salt dissolving water distributing trough after adjusting to PH9-10.Or
PH value adjustment is carried out in salt dissolving water distributing trough.Micro bivalent metal ion such as calcium, magnesium, strontium, barium etc. can be in regenerated acidic water
Primary brine treatment process is purified.After regenerative wastewater is by adjusting pH value, salt dissolving use can be recycled, is not had to ionic membrane
It is how many to influence.This applies small investment, and reduces the influence of chloride ion and salinity to environmental protection station system.It is recommended as preferred option.Machine
Pump cooling water and steam cold water are mostly high purity water or production water, impurity without exception, can be recycled to salt dissolving supplement water.
According to calculating, 100,000 tons of soda equipment salt dissolvings need to supplement about 750 ton/days of water daily, remove and use 200 ton/days of brine,
About 550 ton/days of water of supplement production is also needed, the waste water of self-discharging can be consumed completely.Therefore chlor-alkali first (soda equipment) all
Waste water can all recycle salt dissolving utilization, accomplish waste water zero emission.
PVC device part: peace and quiet washing is carried out to acetylene gas using 0.1% or so sodium hypochlorite, to remove sulphur removal phosphorus etc.
Substance produces a large amount of sodium hypochlorite waste water.Containing the organic matters such as some acetylene in waste water, at the same containing some salinities, chlorine from
Son, effective chlorine etc. go to handle, are difficult to handle if being discharged to environmental protection station.Using the technology of recycling, i.e., useless chlorine sodium acid
Water inputs degassing tower, recycles the acetylene gas dissolved in hypochloric acid water waste water, using desulfurization phosphorus device, by treated in this way
The sodium hypochlorite that sodium hypochlorite waste water is re-dubbed again again, cycle applications are washed in acetylene cleaning.Acetylene gas is recycled on the one hand to increase
Add economic benefit, reduced waste, while ensure that the sodium hypochlorite safe handling of compounding；Desulfurization phosphorus is to avoid in useless sodium
The excessively high influence compounding effect of acetylene.The sodium hypochlorite waste water recycling that 85% or so can also be recycled, separately there is 15%
Sodium hypochlorite waste water is discharged into calcium carbide Slag treatment, to reduce the accumulation of sulphur phosphorus.
The polymerization produced in PVC polymerization is from water, containing substances such as VCM, high organic matters, wherein VCM content about 10PPm,
COD content reaches 1000mg/L, and there are also other suspended matters etc., is difficult to handle by environmental protection station.Can be used biochemical, filtering, from
Son exchange or hyperfiltration, reuse PVC device uses after handling most of polymeric wastewater.
Wherein mother liquid coming is after biochemical treatment, and COD is less than 30PPm, and through fiber filter, goes in water removal suspended matter and big
Enter materialization advanced treatment system after the colloid of grain.Materialization advanced treatment system includes two weights of ozone oxidation and activated carbon adsorption
Want the stage.Ozone generator generates O3, enter in the reactor containing waste water later, rest COD continued to decompose oxidation, then
Residual organic substances and impurity absorption are carried out by being pumped into active carbon filter, COD is reduced to 10mg/l hereinafter, being stored at this time
In clear water reserviors, enter water as ion exchange system.Pure water manufacture system uses ion exchange technique, and it is small that effluent index controls COD
In 3mg/l, conductivity is less than 1us/cm, reaches polymerization water requirement.
There are also one mercury-containing waste water in the production of PVC device, it is mainly derived from washing, the spent acid of caustic wash process, salkali waste are formed
Mercury-containing waste water；In addition the waste liquid and vinyl chloride that there are also by-product hydrochloric acids in course of production of chloroethylene to generate during de- analysis turn
Change device catalyst, the filling of demercuration device active carbon, the mercurous flushing water generated in replacement process etc..Treatment process is exactly first mercurous useless
Water is by vulcanized sodium chemical precipitation, then is filtered, then by removal of mercury trap, returns to acetylene reactor after processing up to standard.
Steam condensate (SC) can be readily modified as circulating water and be returned with backheat sink or hydrogen chloride synthetic furnace, pump cooling water
To circulation, other carbide slag supernatant fluids may return to acetylene generator recycling.It in this way can be with emission reduction, to reach useless
Water " zero-emission " requirement.
Trichloro ethylene and tetrachloroethanes device part: pump cooling water and the relatively good processing of steam condensate (SC) can recycle
To circulation or it is discharged into environmental protection station.Most it is intractable be trichloro ethylene tail gas water, it be absorb triolefin, hydrogen chloride tail
Gas forms the organic matter acid waste water containing COD.Using introducing carbide slag supernatant fluid as its tail gas absorption water, and circulation makes
With, it is acid using the alkalinity neutralization tail gas of carbide slag, and reduce this strand of waste water and generate.To reach waste water zero emission.
CPE device part: CPE production is produced using water phase suspension, and CPE is by high density or low density polyethylene (LDPE)
Haloflex is made through chlorination reaction in PE.And Aqueous phase produces the acid that CPE per ton about generates 15 tons or so of chloride ion-containing
Property waste water, such waste water hydrochloric about 2~3%, and containing the organic matters such as a large amount of initiator, dispersing agent neutralizes according to caustic soda
Method, higher cost, and generate with high salt after neutralizing, it is even more impossible to handle.The present invention introduces carbide slag by technological transformation, this strand of waste water,
Carbide slag supernatant fluid is formed after filters pressing, returns to acetylene generator use.Solves the row of this strand of organic matter acid waste water in this way
Problem is put, while reducing neutralization expense ten thousand yuan about more than 800 every year.Other waste water are discharged into environmental protection station processing.
Public work device part: public work Purified Water Station Pure-water Making is purified using zwitterion resin bed, is produced
Green resin regenerating spent acid buck can enter salt dissolving and handle, and other all kinds of waste water plan as a whole recycling after being discharged into environmental protection station processing.
According to above each section zero discharge treatment scheme, ionic exchange membrane caustic waste water can all recycle salt dissolving utilization；
PVC device acetylene cleaning time sodium waste water, which passes through degassing sulphur removal phosphorus technical treatment and recycles compounding time sodium, to be used, and polymeric wastewater passes through
Reuse paradigmatic system after technical treatment；Triolefin tail water and CPE acid water introduce calcium carbide Slag treatment, and waste water can be greatly decreased in this way
Discharge amount.Other waste water are through environmental protection station neutralization, sedimentation, biochemistry, secondary settlement, filtering and except can achieve one He of table after ammonia nitrogen
The index of index and production water in table two.
The main waste water index of table one
| Serial number | Project | Produce the index of water |
| 1 | PH | 6.0-9.0 |
| 2 | SS(mg/L)≤ | 30 |
| 3 | Turbidity (NTU)≤ | - |
| 4 | BOD5(mg/L)≤ | 30 |
| 5 | COD(mg/L)≤ | - |
| 6 | Iron (mg/L)≤ | - |
| 7 | Manganese (mg/L)≤ | - |
| 8 | CL-(mg/L)≤ | 300 |
| 9 | Total hardness is (with CaCO3Meter mg/L≤ | 850 |
| 10 | Total alkalinity is (with CaCO3Meter mg/L≤ | 500 |
| 11 | Ammonia nitrogen (mg/L)≤ | - |
| 12 | Total phosphorus (mg/L in terms of P)≤ | - |
| 13 | Free chlorine residual (mg/L)≤ | End 0.1~0.2 |
| 14 | Total dissolved solid (mg/L)≤ | 1000 |
| 15 | Excrement colibacillus group (a/L)≤ | 2000 |
The index of the production water of table two
Due to solving high-salt wastewater, high organic wastewater etc., by environmental protection station processed waste water in source dual treatment
The numerical value such as middle organic matter and chloride ion meet production water index (wherein COD is controllably in 40mg/L hereinafter, chloride ion CL-≤
250mg/L), it can all add in production water water intaking pond, to accomplish that waste water all comprehensively utilizes, be truly realized waste water
" zero-emission ".
It above are only and preferred embodiments of the present invention are illustrated, above-mentioned technical characteristic can form multiple hairs in any combination
Bright example scheme.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, if use the improvement for the various unsubstantialities that conception and technical scheme of the invention carry out, or it is not improved will
Conception and technical scheme of the invention directly apply to other occasions, within the scope of the present invention.
Claims (6)
1. a kind of chlor-alkali enterprises waste water circulation comprehensive utilizes Zero discharging system, including salt dissolving water distributing trough, ionic exchange membrane caustic, life
Water water intaking pond, calcium carbide slag bath, PVC device and environmental protection station are produced, the salt dissolving water distributing trough and calcium carbide slag bath are fetched water with production water
Pond is connected, and the salt dissolving water distributing trough is connected with ionic exchange membrane caustic circulation, and the calcium carbide slag bath and PVC device and environmental protection station are equal
It is connected, it is characterised in that: it further include time sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing unit,
The secondary sodium wastewater treatment equipment, polymeric wastewater processing unit and mercury-containing waste water processing unit are connected with PVC device, polymerization
The wasted water outlet of wastewater treatment equipment and mercury-containing waste water processing unit is connected with calcium carbide slag bath.
2. chlor-alkali enterprises waste water circulation comprehensive as described in claim 1 utilizes Zero discharging system, it is characterised in that: further include acetylene
The wasted water outlet of generator, the polymeric wastewater processing unit and mercury-containing waste water processing unit passes through acetylene generator and electricity
Rock ballast pond is connected.
3. chlor-alkali enterprises waste water circulation comprehensive as described in claim 1 utilizes Zero discharging system, it is characterised in that: further include triolefin
And four alkane devices, the triolefin tail water that triolefin and four alkane devices generate are delivered to calcium carbide slag bath, the supernatant of calcium carbide slag bath is delivered to
In triolefin and four alkane devices, is formed and be recycled；Pump waste water is delivered to environmental protection station in triolefin and four alkane devices.
4. chlor-alkali enterprises waste water circulation comprehensive as described in claim 1 utilizes Zero discharging system, it is characterised in that: further include CPE
Device, the CPE device are connected with environmental protection station, and CPE device is connected with calcium carbide slag bath.
5. chlor-alkali enterprises waste water circulation comprehensive as described in claim 1 utilizes Zero discharging system, it is characterised in that: the ionic membrane
Regeneration sour water, buck, light salt brine containing nitre, steam condensate (SC), the pump cooling water generated in soda equipment flows back being delivered to
In salt water distributing trough.
6. chlor-alkali enterprises waste water circulation comprehensive as described in claim 1 utilizes Zero discharging system, it is characterised in that: the PVC dress
The acetylene cleaning time sodium waste water for setting generation is flow in time sodium wastewater treatment equipment, and treated for the secondary sodium wastewater treatment equipment
Water is back in PVC device, and redundance returns to calcium carbide slag bath.
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