CN1183047C - Method for comprehensive treatment and utilization of industrial water - Google Patents
Method for comprehensive treatment and utilization of industrial water Download PDFInfo
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- CN1183047C CN1183047C CNB021094160A CN02109416A CN1183047C CN 1183047 C CN1183047 C CN 1183047C CN B021094160 A CNB021094160 A CN B021094160A CN 02109416 A CN02109416 A CN 02109416A CN 1183047 C CN1183047 C CN 1183047C
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- water
- reverse osmosis
- reverse
- concentrated solution
- osmosis
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Abstract
The present invention relates to an integrated treatment and utilization method of industrial water. The present invention solves the problem of low utilization rate of industrial water in the prior art. The present invention has the scheme that steam boiler feedwater is prepared by the reverse osmosis flow and the ion exchanging combination desalting flow; after concentrated solution of reverse osmosis is softened, one part of concentrated solution of reverse osmosis is circularly in reverse osmosis treatment, and thus, the water recovery rate in the process of preparing the steam boiler feedwater is enhanced; the other part of concentrated solution of reverse osmosis is directly and further in reverse osmosis treatment, the treated osmosis solution substitutes for or partially substitutes for fresh water as replenishing water of a circulating water system, the water quality of the circulating water system is improved, and the use amount of the fresh water is reduced. The method of the present invention can reduce the use amount of industrial fresh raw water, and simultaneously, the discharge amount of sewage is reduced. The water utilization rate is increased, and the present invention is suitable for factories which simultaneously need steam boilers and circulating cooling water.
Description
Technical field
The present invention relates to a kind of processing of process water and utilize method, be mainly used in the consumption that reduces fresh water in the Industrial processes, especially in the recirculating cooling water system that reduces Industrial processes as the fresh water consumption of system's make up water.The invention belongs to industry water saving processing technology field.
Background technology
The water consumption of Industrial processes is huge, account for more than 20% of the total consumption of present water greatly, and along with the fast development of industry, the share of process water also will continue to increase, because the shortage day by day of water resources, the water saving particularly water saving in Industrial processes has become an important task.Show by water using analysis Industrial processes, industrial fresh water mainly consumes replenishing at the preparation of steam boiler feedwater and recirculated cooling water, as investigating according to recent water to factory of China petrochemical refining, the make up water of steam boiler feedwater and recirculated water accounts for more than 40% and 20% of the total fresh water consumption of refinery respectively in the refinery, and the emphasis that therefore reduces process water should be put on these two processes.
The fresh water of recirculating cooling water system replenishes and is mainly used in two aspects.Losing owing to evaporation, air-cooled tower blow to lose on the one hand, is to lose for keeping circulating cooling system water quality partly to efflux on the other hand.The general control project of circulating water quality has: calcium is hard, basicity, turbidity, electricity are led, pH etc.
The steam boiler feedwater is to supply raw materials for steam boiler generation steam, control to water quality requires very strict, according to different boiler pressure grades, need carry out a series of advanced treatment to first source water (being surface water at first) and prepare pure water or high purity water, preparation is made up of pre-treatment, desalting treatment and aftertreatment three parts usually.Based on different source water qualities and effluent quality control requirement, present main traditional source clarification of water, sand filtration, the degassing, activated carbon treatment, the serial ion-exchange flow processs such as (multiple bed, mixed bed, smart beds) of adopting.In this complicated Production Flow Chart, ion-exchange desalination and precision processing are the most important, also are the control units of decision steam boiler feedwater preparation expense, obtain softening and desalination through pretreated source, front water by this process.
In recent years along with the minimizing year by year of surface water available quantity and the increase year by year of pollution components and content, more and more enterprises has to replace surface water to make the source water of steam boiler feedwater preparation with underground water, because underground water has higher hardness, basicity and salts contg, only adopt traditional single ion-exchange unit desalination in economy, operability, expose increasing shortcoming on the environment, as keep under the constant condition of loading capacity, exchange and regeneration period shorten, regeneration expends soda acid and fresh water amount increases, wastewater discharge increases, ion exchange resin adsorption efficiency and work-ing life descend fast, cause working cost to increase.To this, particularly along with being gradually improved and universalness of a kind of new efficient desalination reverse osmosis and reverse osmosis membrane technology and equipment, by reverse osmosis and ion-exchange combination process become the steam boiler feedwater prepare in the best flow process of desalination and precision processing.Utilize the efficient ratio of desalinization and the low operating cost of reverse osmosis units, make the total salt that before pretreated source water is entering ion-exchange, removes 90%-95%, alleviated the exchange load of the ion-exchange of back greatly, significant prolongation the resins exchange and the regeneration period of ion-exchange unit, soda acid and fresh water amount that exchange resin regeneration is consumed, the work-ing life of having improved exchange resin have significantly been reduced, and make steam boiler feedwater water quality obtain to a certain degree improvement, finally greatly reduce the cost of steam boiler feedwater preparation.Begin to adopt this combination process as a collection of enterprises such as China Petrochemical Industry's high bridge refinery, Cangzhou Refinery and Central Plains ethene, and obtained satisfied effect.Yet source water, particularly contain high relatively impurity such as calcium magnesium hardness, heavy metal, biological bacterium and silicon-dioxide in the underground water of certain areas, when carrying out reverse osmosis desalination, although taked some preprocessing means, but in the higher water rate of recovery, as more than 75%, still can cause these impurity to be deposited on the reverse osmosis membrane because of lower water-soluble holding back, cause film to pollute or obstruction, for avoiding this problem to take place, many enterprises have to control the lower rate of recovery, as 60%, but this has wasted great lot of water resources, and has increased working cost.For improving the process water rate of recovery, U.S. Pat 6110375 has proposed a kind of method, a part of concentrated solution in the reverse-osmosis treated process is carried out the ion-exchange desalting treatment, again be mixed into circular treatment in the feed water by reverse osmosis after the processing, improved the water quality of whole feed water by reverse osmosis by this method, the water rate of recovery that has improved process is to 75%-85%.Yet this method exists following shortcoming: because the concentrated solution salts contg of source water after reverse-osmosis treated concentrated, as being source water with underground water, the salts contg in the concentrated solution has reached 1500mgL
-1, again through the ion-exchange desalting treatment, can significantly increase the exchange load of exchange resin, working cost increases more; The reverse osmosis concentrated liquid of the final 15%-25% of also having is discharged system with the form of waste water in this in addition method, causes the waste of water resources.
Summary of the invention
How problem to be solved by this invention particularly improves the utilization ratio of industrial steam boiler water feeding system water resources for how improving the utilization ratio of service water resource.The object of the present invention is to provide a kind of water utilization rate height, equipment is simple, working cost is low process water comprehensive treating process and utilize method.
The present invention program is: the required source water of steam boiler carries out reverse osmosis (hereinafter referred to as reverse osmosis 1) and handles after pre-treatment, and penetrating fluid carries out supplying with the steam boiler water inlet after the ion-exchange desalting treatment.The concentrated solution of reverse osmosis 1 softens processing, the softening water inlet of handling the rear section circulation as reverse osmosis 1, and rest part carries out reverse osmosis (to call reverse osmosis 2 in the following text) once more to be handled, and penetrating fluid is as the make up water of recirculated cooling water, the concentrated solution blowdown.
The inventive method is softened processing by the unitary concentrated solution of reverse-osmosis treated to reverse osmosis and the feedwater of ion-exchange combination desalination flow preparation steam boiler, and part recycles, improved and suppressed the water quality factors that reverse osmosis process can not carry out under the high water rate of recovery, improved the water rate of recovery of steam boiler feedwater preparation process.Adopt softening method to handle the concentrated solution of reverse osmosis simultaneously, it is not the ion-exchange desalination, only the impurity such as calcium magnesium hardness, heavy metal and silicon-dioxide in the reverse osmosis concentrated liquid soften and remove, saved the exchange capacity of exchange resin and loaded, reduced facility investment and working cost.Steam boiler feedwater preparation process reverse osmosis units liquid effluent is after softening the processing, owing to finished removing to impurity such as calcium magnesium hardness, heavy metal and silicon-dioxide, can directly further carry out reverse-osmosis treated, penetrating fluid after the processing can be back to use recirculating cooling water system, replacement or part replace fresh water to make the make up water of circulating water system, have improved the water quality of circulating water system and have reduced system's fresh water consumption.Pass through the inventive method, both reach the reverse osmosis process water rate of recovery in the raising steam boiler feedwater preparation, reduced facility investment and working cost, reduced the circulating water system amount of makeup water again, finally reach the purpose that reduces process water, reduces sewage discharge, the source water use efficiency can reach more than 95%.
Description of drawings
Fig. 1 is the comprehensive treating process of service water of the present invention and utilizes the method flow synoptic diagram, in the steam boiler water treatment system, add softening and second reverse osmosis unit, in the utilization ratio that improves oiler feed, part can be used for the make up water of recirculating cooling water system, and total interest rate of source water is improved greatly.
Embodiment
Source water (underground water or surface water) is through the pre-treatment of routine, after pretreatment process shown in present steam boiler feedwater such as clarification, sand filtration, the degassing, the activated carbon treatment etc., by entering reverse osmosis 1 processing unit after the more medium filter filtration.The ion-exchange that the penetrating fluid that reverse osmosis 1 is handled enters the back mixes further feed water needed pure water or high purity water of a Processing of Preparation steam boiler of bed or smart bed, and its water yield is controlled to be the 75%-85% of source water; The concentrated solution of reverse osmosis 1 carries out sulphonated coal or Na
+Ion or H
+Ion is softening to be handled, its water yield is controlled to be the reverse-osmosis treated unit total inflow 25%-40% of (comprising the internal circulating load after concentrated solution is handled), the 10%-20% of reverse osmosis units total inflow will wherein be accounted for, be circulated in the water inlet of reverse osmosis 1 and make circular treatment, remaining again through another group reverse osmosis 2 processing, handle the penetrating fluid reuse and make the make up water that circulating water system replacement fresh water is made circulating water system, rate of permeation is 60%-80%, be back to use recirculating cooling water system and control the 10%-20% that the water yield can reach reverse osmosis 1 total inflow, the concentrated solution discharging.
Involved in the present invention to reverse-osmosis treated can adopt rolled membrane module, plate type membrane component or tubular membrane component, but preferably select rolled membrane module for use, mould material can be selected a kind of in the materials such as cellulose acetate, many cellulose acetates, polymeric amide, polysulfone composite membrane for use, and the infiltration water flux is 10-40Lh
-1m
-2, average ratio of desalinization is 90%-95%.It is controlled in operating process, and precipitation does not take place with each component of concentrated solution in the concentrated solution output and biological bacteria concentration does not endanger reverse osmosis membrane, as (Ca
2+) * (SO
4 2-)＜1.9 * 10
-4
In the method that is used for reverse osmosis concentrated liquid is softened processing that the invention described above is mentioned, used medium can adopt sulphonated coal or other Na
+Ion, H
+Ion exchange resin, but preferably adopt sulphonated coal to handle is 90%-95% to the softening rate of reverse osmosis concentrated liquid.
Embodiment 1: domestic certain factory of petrochemical refining adopts fresh surface water, and the steam boiler feedwater prepares and the make up water of recirculating cooling water system for source water is done, and average source water quality is: the hard 55.5mgL of calcium
-1, basicity 85mgL
-1, turbidity 105mgL
-1, electricity is led 875us/cm, pH7.05, total dissolved solidss 435mgL
-1, be used for steam boiler feedwater and circulating water system and be respectively 295m because of the water yield of evaporating and the loss of air-cooled tower replenishes
3h
-1And 210m
3h
-1Take preceding pre-treatment, reverse osmosis membrane and ion-exchange combination process to prepare the steam boiler feedwater at present, owing to contain calcium, the magnesium ion of higher concentration in the water of source, can only adopt 60% time operation of the lower water rate of recovery at reverse osmosis units, make the source water yield of process need reach 490m
3h
-1, reverse osmosis concentrated liquid can only discharge with the form of sewage owing to contain higher calcium magnesium hardness and total dissolved solid, and quantity discharged reaches 195m
3h
-1, cause waste, running cost and the effluent charge of water resources higher.
Adopt method provided by the present invention, in the preparation process process of steam boiler feedwater, the source water yield that enters the reverse osmosis units processing after the pre-treatment is 347m
3h
-1, on average permeating water production rate is 295m
3h
-1, reverse osmosis process concentrated solution circular treatment amount 87m
3h
-1, wherein loop back feed water by reverse osmosis 35m
3h
-1, system effluxes 52m
3h
-1, calculate according to solubility product easy deposited components in the reverse osmosis concentrated liquid, under this high water rate of recovery, reverse osmosis can be kept long-time running, and bad problems such as film deposition can not take place.Efflux 52m in system
3h
-1In the water, the hard 11mgL of calcium
-1, basicity 23mgL
-1, turbidity 10mgL
-1, electricity is led 3200mgL
-1, Cl-400mgL
-1, pH8.0, total dissolved solid 1740mgL
-1, owing to have good water demineralization character, directly carry out reverse osmosis desalination again, the control water rate of recovery 75% can keep the reverse osmosis equipment long-time running in this process, and bad problems such as film deposition can not take place, and handling and reclaiming the water yield is 40m
3h
-1, in the water quality calcic hard＜2mgL
-1, basicity＜3mgL
-1, turbidity＜10mgL
-1, electricity is led 350mgL
-1, Cl
-＜40mgL
-1, total dissolved solid 170mgL
-1, water quality obviously is better than the fresh water make up water of circulating water system, has not only replaced replenishing of system's fresh water, and can improve the water quality of full cycle water system, improves the recirculated water cycles of concentration.By adopting method of the present invention, finally make steam boiler feedwater preparation process reduce fresh source water 143m
3h
-1, make circulating water system reduce fresh source water 40m
3h
-1, two amount to minimizing fresh water amount 183m
3h
-1, reduce the blowdown flow rate 183m of system
3h
-1, the overall utilization of source water reaches 96.5%, and 85% is the water inlet of high-quality steam boiler.
Embodiment 2: the source water among the embodiment 1 is replaced surface water by underground water, descend source water water quality to be fifty-fifty: the hard 200mgL of calcium
-1, basicity 250mgL
-1, turbidity 0.2mgL
-1, electricity is led 930us/cm, pH7.7, total dissolved solidss 465mgL
-1Adopt method provided by the present invention, in the preparation process of steam boiler feedwater, the concentrated solution that reverse osmosis units is handled carries out the softening processing of sulphonated coal, part loops back and carries out circular treatment in the feed water by reverse osmosis again, and the source water yield that enters the reverse osmosis units processing after the pre-treatment is 367m
3h
-1, on average permeating water production rate is 295m
3h
-1, reverse osmosis process concentrated solution circular treatment amount 144m
3h
-1, wherein loop back feed water by reverse osmosis 72m
3h
-1, system effluxes 72m
3h
-1, calculate according to solubility product easy deposited components in the reverse osmosis concentrated liquid, under this high water rate of recovery, reverse osmosis can be kept long-time running, and bad problems such as film deposition can not take place.The 72m that effluxes in system
3h
-1In the water, the hard 37mgL of calcium
-1, basicity 50mgL
-1, turbidity＜0.2mgL
-1, electricity is led 3800mgL
-1, pH7.8, total dissolved solid 1860mgL
-1, owing to have good water demineralization character, directly carry out reverse osmosis desalination again, the control water rate of recovery 75% can keep the reverse osmosis equipment long-time running in this process, and bad problems such as film deposition can not take place, and handling and reclaiming the water yield is 54m
3h
-1, in the water quality calcic hard＜4mgL
-1, basicity＜5mgL
-1, turbidity＜0.1mgL
-1, electricity is led 380mgL
-1, total dissolved solid 180mgL
-1, water quality obviously is better than the fresh water make up water of circulating water system, has not only replaced replenishing of system's fresh water, and can improve the water quality of full cycle water system, improves the recirculated water cycles of concentration.By adopting method of the present invention, 80% of source water enters and is oiler feed, and 15% is the circulating cooling system make up water, and overall utilization reaches 95%, has reached the purpose that reduces the fresh water consumption and reduce blowdown flow rate.Rolled membrane module is adopted in the reverse osmosis of using among above-mentioned two embodiment, and mould material is a cellulose acetate, and the infiltration water flux is 30Lh
-1m
-2, ratio of desalinization is 93%, and reverse osmosis pressure is 0.30MPa, and the softening rate that sulphonated coal is handled is more than 90%.
Claims (8)
1, a kind of comprehensive treating process of service water and utilize method adopts reverse osmosis and ion-exchange desalination combination process to prepare the steam boiler feedwater, it is characterized in that the concentrated solution after the reverse-osmosis treated adopts sulphonated coal, Na
+Ion-exchanger or H
+After ion-exchanger softened processing, a part looped back reverse-osmosis treated, and another part directly carries out reverse-osmosis treated once more, and the penetrating fluid after the processing is as the make up water of recirculating cooling water system.
2,, it is characterized in that the softening treatment capacity of described reverse osmosis concentrated liquid is controlled to be the 25%-40% of the total inflow that comprises the internal circulating load after concentrated solution is handled according to the described service water comprehensive treating process of claim 1 with utilize method.
3, according to the described service water comprehensive treating process of claim 1 with utilize method, it is characterized in that described reverse osmosis concentrated liquid after softening the processing, the amount that loops back reverse osmosis is the 10%-20% that comprises the total inflow of the internal circulating load after concentrated solution is handled.
4, according to the described service water comprehensive treating process of claim 2 with utilize method, it is characterized in that concentrated solution after the described reverse-osmosis treated is after softening the processing, directly further carry out reverse-osmosis treated, it is the 10%-20% that comprises the total inflow of the internal circulating load after concentrated solution is handled that the penetrating fluid after the processing is back to use the recirculating cooling water system control water yield.
5,, it is characterized in that described two kinds of reverse osmosiss adopt rolled membrane module, plate type membrane component or tubular membrane component according to the described service water comprehensive treating process of claim 1 with utilize method.
6,, it is characterized in that described two kinds of reverse osmosiss adopt rolled membrane module according to the described service water comprehensive treating process of claim 1 with utilize method.
7,, it is characterized in that described two kinds of used mould materials of reverse osmosis select a kind of in the materials such as cellulose acetate, many cellulose acetates, polymeric amide, polysulfone composite membrane for use according to the described service water comprehensive treating process of claim 1 with utilize method.
8, according to the described service water comprehensive treating process of claim 1 with utilize method, it is tenderizer that sulphonated coal is adopted in the softening processing that it is characterized in that the concentrated solution after the described reverse-osmosis treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021094160A CN1183047C (en) | 2002-04-04 | 2002-04-04 | Method for comprehensive treatment and utilization of industrial water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021094160A CN1183047C (en) | 2002-04-04 | 2002-04-04 | Method for comprehensive treatment and utilization of industrial water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448348A CN1448348A (en) | 2003-10-15 |
| CN1183047C true CN1183047C (en) | 2005-01-05 |
Family
ID=28680419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021094160A Expired - Lifetime CN1183047C (en) | 2002-04-04 | 2002-04-04 | Method for comprehensive treatment and utilization of industrial water |
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| Country | Link |
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| CN (1) | CN1183047C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400432C (en) * | 2004-10-29 | 2008-07-09 | 中国石油化工股份有限公司 | Terephthalic acid production waste water disposal method |
| CN101279780B (en) * | 2008-05-20 | 2010-06-02 | 钮德明 | Method for removing sugar of and purifying boiler water for sugar refinery |
| CN102167455B (en) * | 2011-03-08 | 2012-08-22 | 北京科净源科技股份有限公司 | Water treatment technology building method of circulating water system |
| CN104058482A (en) * | 2013-03-22 | 2014-09-24 | 苏州鑫泽雅节能设备有限公司 | Water purifier |
-
2002
- 2002-04-04 CN CNB021094160A patent/CN1183047C/en not_active Expired - Lifetime
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| CN1448348A (en) | 2003-10-15 |
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