CN103304051A - Coal gas recycle water treatment technology - Google Patents
Coal gas recycle water treatment technology Download PDFInfo
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- CN103304051A CN103304051A CN 201210069214 CN201210069214A CN103304051A CN 103304051 A CN103304051 A CN 103304051A CN 201210069214 CN201210069214 CN 201210069214 CN 201210069214 A CN201210069214 A CN 201210069214A CN 103304051 A CN103304051 A CN 103304051A
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Abstract
The invention relates to a coal gas recycle water treatment technology which specifically comprises the steps as follows: 1) enabling up-to-standard disposal sewage into a homogenizing bath for homogenizing water quality and water volume for hydraulic retention time of 24-48 hours; 2) delivering water homogenized by the homogenizing bath into a rough filtering device, filtering out particulate matters with particle size of more than 0.1mm, and then flowing in an ultrafiltering device; 3) according to different water recycle rates, selecting a dosing device mode or a dosing device and softener combination mode for treating sewage; and 4) enabling the ultrafiltered sewage to flow in one or more reverse osmosis device, separating salt in the sewage from water, and enabling water separated out through the reverse osmosis device to flow in the final pool. The coal gas recycle water treatment technology has the following advantages of meeting the usage requirements of different use units by adopting faintly-acid, neutral or faintly-alkali treatment mode according to different water recycle rates. The final producing water has wide purposes, the quality of the finally producing water is extremely good and far superior to that of industrial new water or underground water.
Description
Technical field:
The present invention relates to a kind of water, waste water, sewage disposal, more specifically to a kind of gas maked coal reuse water treatment process.
Background technology:
Because historical reasons, there is the general layout that the Economic development of coastal region, east is relatively good, the Midwest Economic development is slow in China, thereby causes the coastal region, east bigger to the energy, industrial chemicals demand.And the mineral wealth of China mainly concentrate on the northwestward, and country actively pushes forward the energy strategy of transmitting electricity from west to east, transfering natural gas from the west to the east.Coal is as main mineral wealth, and long-distance transport not only takies the railway freight resource, and transportation inconvenience; Coal is made Sweet natural gas carry out pipe-line transportation and benefit the nation and the people, therefore coal preparing natural gas project just moves forward steadily in energy important place, the northwestward in recent years, and for example Inner Mongol Ke Shike rises 4,000,000,000 Nm
3/ year coal preparing natural gas project, accurate east, Xinjiang 8,000,000,000 Nm
3/ year coal preparing natural gas project etc.
In coal preparing natural gas project, the Technology of Lurgi stove is used widely.Learn through the sampling of wastewater analysis that Lurgi stove coal vaporization back is produced, this waste water contains a large amount of phenol and derivative thereof, phenols content is greater than 50mg/l, COD content is about 300mg/l, ammonia-nitrogen content is at 100-200mg/l, and the about 2000-3000mg/ of TDS content contains a large amount of hard-degraded substances, for example: materials such as pyridine, indoles, quinoline, biphenyl, and contain a certain amount of tar class material.These materials are difficult to degrade fully by the biochemical treatment means, and because the characteristic of biochemical treatment, the variation of water quality, the water yield easily causes biochemical treatment effect instability, and COD, ammonia-nitrogen content are than higher in the blowdown water, and generally these sewage disposals back up to standard is directly discharged and can't be utilized again.
Area, northwestward water resources poorness, the ecosystem is relatively more fragile, and coal preparing natural gas project needs a large amount of new water, therefore these discharge waters is handled the back reuse and has great energy-saving and emission-reduction application value.
Because COD, ammonia nitrogen, TDS adopt traditional ion exchange resin uneconomical than higher in the qualified discharge water; Adopt simple reverse osmosis membrane system fluctuation of service.Therefore existing reuse treatment process generally can only reach simple reuse, and floor space is big, reuse water yield point of application few, reuse water is few.
Summary of the invention:
The objective of the invention is to provide at the prior art weak point a kind of and can take into account the high gas maked coal reuse water treatment process of operation stability and the water rate of recovery.
The objective of the invention is to realize by following measure: a kind of gas maked coal reuse water treatment process is characterized in that concrete steps are as follows:
Step 1, sewer up to standard enter the homogeneous pond, are aided with the homogenizing that pressurized air stirring or churned mechanically mode are carried out water quality, the water yield, hydraulic detention time 24-48 hour;
Send into the coarse filtration device after the water homogenizing in step 2, homogeneous pond, the particulate matter that the filtering particle diameter surpasses 0.1mm enters ultra-filtration equipment again;
Step 3, according to the difference of the water rate of recovery, select chemicals dosing plant pattern or chemicals dosing plant, softening agent integrated mode to dispose of sewage:
The described rate of recovery be 75% and more than, select softening agent and chemicals dosing plant pattern for use, it is softening by resin flexibilizer to go into softening agent earlier, adds alkali lye by chemicals dosing plant again, described alkali lye is sodium hydroxide or potassium hydroxide, regulating the pH value is 9.5～11.5;
The described rate of recovery is 65-75%, selects the chemicals dosing plant pattern for use, adds reverse osmosis scale inhibitor special and acid by chemicals dosing plant, and described acid is technical hydrochloric acid or industrial sulphuric acid, and regulating the pH value is 6.5～7.5;
The described rate of recovery is 50-65%, selects the chemicals dosing plant pattern for use, adds acid by chemicals dosing plant, and described acid is technical hydrochloric acid or industrial sulphuric acid, and regulating the pH value is 5.5～6.5;
Step 4, the sewage after ultrafiltration enter one or more reverse osmosis unit, with the salinity in the sewage and water sepn, a plurality of reverse osmosis units adopt serial connection to connect, the water inlet of the unit reverse osmosis unit in back is the strong brine of previous element reverse osmosis unit, the moisture that each unit reverse osmosis unit is separated out enters final product pond, detect the TDS mg/l of residue strong brine, surpass 100000mg/l and finish reverse osmosis, strong brine enters multiple-effect evaporator or evaporation pond evaporates.
The coarse filtration device is more medium filter or lamination strainer or screen filter or y-type filter in the described step 2.
Ultra-filtration equipment is the ultrafiltration membrane elements of external-compression type in the described step 2, and ultrafiltration membrane elements film silk adopts the material of PVDF, 0.03 micron of nominal membrane pore size.
Resin flexibilizer is strong acid gel-type sun resin 001x7 or weak acid macroporous ion-exchange resin D113 in the described step 3.
Compared with prior art, the gas maked coal reuse water treatment process that the present invention proposes has following advantage: 1) according to the difference of the water rate of recovery, adopt slightly acidic or neutral or weakly alkaline tupe, satisfy the service requirements of different applying units; 2) the reverse osmosis unit operational conditions can exceed the operational conditions of existing reverse osmosis unit, can relax CODmn＜200mg/l to the water inlet condition; 3) the integrated degree of ultra-filtration equipment is very high, can realize increasingly automated operation and monitoring, and its pollution index SDI=1～2 are far above traditional technology SDI=4.5～5.5; 4) final product water of the present invention is of many uses, the final water water quality of producing is fabulous, be far superior to industrial fresh water or underground water, can be used as the water places such as former water, greening water of make up water, the desalination water station of the Xin Shui of plant area, recirculated water, have great energy-saving and emission-reduction application value.The present invention is specially adapted to the wastewater treatment of difficult degradation COD, and it is the processing of the blowdown water of gas maked coal system for dragon.
Description of drawings:
Fig. 1 is the treatment system figure of one embodiment of the invention.
Among the figure: the 1-sewer, 2-homogeneous pond, 3-coarse filtration device, the 4-ultra-filtration equipment, the 5-softening agent, the 6-chemicals dosing plant, 7-reverse osmosis unit, 8-finally produce the pond.
Embodiment:
Below in conjunction with accompanying drawing embodiment is elaborated:
A kind of gas maked coal reuse water treatment process, concrete steps are as follows:
Step 1, sewer up to standard enter the homogeneous pond, are aided with the homogenizing that pressurized air stirring or churned mechanically mode are carried out water quality, the water yield, hydraulic detention time 24-48 hour.
Send into the coarse filtration device after the water homogenizing in step 2, homogeneous pond.Described coarse filtration device is more medium filter or lamination strainer or screen filter or y-type filter, and the particulate matter that coarse filtration device filtering particle diameter surpasses 0.1mm enters ultra-filtration equipment again, can prevent that the film establishment of ultra-filtration equipment is subjected to physical abuse.Described ultra-filtration equipment is the ultrafiltration membrane elements of external-compression type, and ultrafiltration membrane elements film silk adopts the material of PVDF, 0.03 micron of nominal membrane pore size.The ultrafiltration membrane elements that the present invention adopts is that external-compression type filters, and impurity is intercepted at the outside surface of film silk, and clear water flows to next procedure from the internal surface of film silk, thereby the suspended substance of finishing water quality purifies.
Step 3, according to the difference of the water rate of recovery, select chemicals dosing plant pattern or chemicals dosing plant, softening agent integrated mode to dispose of sewage:
The described rate of recovery be 75% and more than, select softening agent and chemicals dosing plant pattern for use, it is softening by resin flexibilizer to go into softening agent earlier, adds alkali lye by chemicals dosing plant again, described alkali lye is sodium hydroxide or potassium hydroxide, regulating the pH value is 9.5～11.5; Described resin flexibilizer is strong acid gel-type sun resin 001x7 or weak acid macroporous ion-exchange resin D113, and the ion chemistry formula of absorption hardness is expressed by following formula:
Mg
2+(or Ca
2+)+2R-H=R
2Mg (or Ca)+2H
+
In the formula, what R represented is the skeleton of resin, i.e. the carrier of resin functional group.
The described rate of recovery is 65-75%, selects the chemicals dosing plant pattern for use, adds reverse osmosis scale inhibitor special and acid by chemicals dosing plant, and described acid is that technical hydrochloric acid or industrial sulphuric acid adjusting pH value are 6.5～7.5; Chemicals dosing plant adds the reverse osmosis scale inhibitor special can be buied by market, as the clear power of the U.S., the Bei Di of AM General, greenization of Britain or some domestic manufacturers.
The described rate of recovery is 50-65%, selects the chemicals dosing plant pattern for use, adds acid by chemicals dosing plant, and described acid is technical hydrochloric acid or industrial sulphuric acid, and regulating the pH value is 5.5～6.5.
In this step, because under different slightly acidics or neutral or weakly alkaline environment, the reverse osmosis pressure of water, corrodibility, fouling tendency are all different, so the potential of hydrogen of water body that can be by Adjustment System operation obtains the different water rate of recovery, even the realization zero release, satisfy the service requirements of different applying units.
Step 4, the sewage after ultrafiltration enter one or more reverse osmosis unit, reverse osmosis unit is desalting plant, utilize the water pump of configuration in the reverse osmosis unit 7 to provide water, salt to separate needed reverse osmosis pressure, with the salinity in the sewage and water sepn, form strong brine and fresh water.Adopt a plurality of reverse osmosis unit serial connections to connect, the water inlet of the unit reverse osmosis unit in back is the strong brine of previous element reverse osmosis unit, can obtain the different rate of recovery, the moisture that each unit reverse osmosis unit is separated out enters final product pond, the rate of recovery of system water can be from 50%～up to 100%, can realize zero release truly.Detect the TDS mg/l of residue strong brine, surpass 100000mg/l and finish reverse osmosis, strong brine enters multiple-effect evaporator or evaporation pond evaporates.
In this step, because material molecule diameters such as ammonia nitrogen, pyridine are littler than the filtration diameter of reverse osmosis membrane, therefore materials such as ammonia nitrogen, pyridine also directly are intercepted at the skin of reverse osmosis membrane separation layer, discharge with strong brine, strong brine enters multiple-effect evaporator or evaporation pond evaporates, these materials or evaporation or be attached in the crystallisate of evaporation.Thereby these can not enter product water, thereby reach the effect of removing these materials.
Further specify below in conjunction with specific embodiment:
Embodiment 1:
Certain coal chemical industry enterprises adopts furnaceman's Lurgi preparation Sweet natural gas of planting, the about 550t/h of sewage that produces, reach following index: CODmn=100mg/l (mean value), ammonia nitrogen=30mg/l (mean value), ss suspended solid=50mg/l (mean value) after treatment, total dissolved solidss TDS=2300mg/l (mean value), pH=6-8 belongs to GB and discharges 3 class standards.This enterprise's process water water intaking takes 1.6 yuan/ton, 2.2 yuan/ton of effluent charge.
It is as follows to use concrete implementing process process of the present invention:
1, because the water quality instability of sewage disposal, the production draining water yield are also unstable, therefore build 10,000 tons 1 in homogeneous pond, stabilizing water quality, the water yield can be used as accident draining water reservoir simultaneously.
2, coarse filtration device 3 adopts the lamination strainer, and filtering accuracy 0.1mm goes out water suspension＜10mg/l;
3, ultra-filtration equipment 4 employing apertures are 0.03 micron external-compression type PVDF ultra-filtration membrane, water outlet SDI＜2;
4, adopt softening agent and chemicals dosing plant pattern, wherein the medicament of chemicals dosing plant adopts sodium hydroxide solution, and product water and pH after softening are respectively: hardness＜0.1mg/l, pH=10-11.
5, reverse osmosis unit adopts 3 nested series connection in unit to use, and the strong brine of previous element is adopted in the water inlet of a back unit, and the fresh water of 3 unit enters final product pond as the final product water of total system.
The final product water of present case is 500t/h, the water rate of recovery 90%, and the removal of impurity of each process section sees Table 1.Produce water water quality and be used for local industrial fresh water, all the other strong brines are used for the flushing cinder of dump.
Economic and Efficiency Analysis:
Through demonstration, the running cost of present case is 3.3 yuan of/ton water, is lower than 3.8 yuan of/ton water of usefulness water rate (2.2 yuan/ton of 1.6 yuan/ton+effluent charge of=water intaking expense) of new water;
Social benefit is analyzed:
Because coal chemical industry enterprises is located in western area, water and draining have strict restriction, and by the demonstration of present case, the environmental impact assessment work of this coal chemical industry enterprises is effectively advanced, for the project verification of this project, starting lays the first stone.
The clearance explanation of the every impurity of table 1
Embodiment 2:
Coal chemical industry enterprises adopts furnaceman's Lurgi preparation Sweet natural gas of planting, the about 90t/h of sewage that produces, reach following index: CODmn=60mg/l (mean value), ammonia nitrogen=20mg/l (mean value), ss suspended solid=15mg/l (mean value) after treatment, total dissolved solidss TDS=3000mg/l (mean value), pH=6-8 belongs to GB and discharges 2 class standards.This enterprise's process water water intaking takes 1.2 yuan/ton, 2.6 yuan/ton of effluent charge.
It is as follows to use concrete implementing process process of the present invention:
1, because the water quality instability of sewage disposal, the production draining water yield are also unstable, therefore build 500 tons 1 in homogeneous pond, stabilizing water quality, the water yield can be used as accident draining water reservoir simultaneously.
2, the coarse filtration device adopts more medium filter, and filtering accuracy 0.05mm goes out water suspension＜10mg/l;
3, ultra-filtration equipment employing aperture is 0.03 micron external-compression type PVDF ultra-filtration membrane, water outlet SDI＜2;
4, adopt the chemicals dosing plant mode treatment, chemicals dosing plant 6 adds reverse osmosis scale inhibitor special and acid, prevents that the inorganic salt fouling from appearring in reverse osmosis unit, and the pH value is 6.5-7.
5, reverse osmosis unit adopts 1 unit, and the fresh water of reverse osmosis unit enters final product pond as the final product water of total system.
The final product water of present case is 63t/h, the water rate of recovery 70%, and the removal of impurity of each process section sees Table 2.Produce water water quality and be used for local industrial fresh water, all the other strong brines discharge behind the precipitation suspended substance.
Economic and Efficiency Analysis:
Through demonstration, the running cost of present case is 1.6 yuan of/ton water, is lower than 3.8 yuan of/ton water of usefulness water rate (2.6 yuan/ton of 1.2 yuan/ton+effluent charge of=water intaking expense) of new water, 1,200,000 yuan of year saving expenses;
Social benefit is analyzed:
The success of this project makes this enterprise reduce discharging 540,000 tons of waste water year, also saves underground water and fetches water 540,000 tons, not only obtains direct economic benefit, also obtains good social benefit.
The clearance explanation of the every impurity of table 2
Below be described in conjunction with the embodiments, above-described embodiment is not construed as limiting the invention, as long as employing is equal to the technical scheme that the form of replacement or equivalent transformation obtains, all drops within protection scope of the present invention.
Claims (4)
1. gas maked coal reuse water treatment process is characterized in that concrete steps are as follows:
Step 1, sewer up to standard enter the homogeneous pond, are aided with the homogenizing that pressurized air stirring or churned mechanically mode are carried out water quality, the water yield, hydraulic detention time 24-48 hour;
Send into the coarse filtration device after the water homogenizing in step 2, homogeneous pond, the particulate matter that the filtering particle diameter surpasses 0.1mm enters ultra-filtration equipment again;
Step 3, according to the difference of the water rate of recovery, select chemicals dosing plant pattern or chemicals dosing plant, softening agent integrated mode to dispose of sewage:
The described rate of recovery be 75% and more than, select softening agent and chemicals dosing plant pattern for use, it is softening by resin flexibilizer to go into softening agent earlier, adds alkali lye by chemicals dosing plant again, described alkali lye is sodium hydroxide or potassium hydroxide, regulating the pH value is 9.5～11.5;
The described rate of recovery is 65-75%, selects the chemicals dosing plant pattern for use, adds reverse osmosis scale inhibitor special and acid by chemicals dosing plant, and described acid is technical hydrochloric acid or industrial sulphuric acid, and regulating the pH value is 6.5～7.5;
The described rate of recovery is 50-65%, selects the chemicals dosing plant pattern for use, adds acid by chemicals dosing plant, and described acid is technical hydrochloric acid or industrial sulphuric acid, and regulating the pH value is 5.5～6.5;
Step 4, the sewage after ultrafiltration enter one or more reverse osmosis unit, with the salinity in the sewage and water sepn, a plurality of reverse osmosis units adopt serial connection to connect, the water inlet of the unit reverse osmosis unit in back is the strong brine of previous element reverse osmosis unit, the moisture that each unit reverse osmosis unit is separated out enters final product pond, detect the TDS mg/l of residue strong brine, surpass 100000mg/l and finish reverse osmosis, strong brine enters multiple-effect evaporator or evaporation pond evaporates.
2. gas maked coal reuse water treatment process according to claim 1 is characterized in that, the coarse filtration device is more medium filter or lamination strainer or screen filter or y-type filter in the described step 2.
3. gas maked coal reuse water treatment process according to claim 1 is characterized in that, ultra-filtration equipment is the ultrafiltration membrane elements of external-compression type in the described step 2, and ultrafiltration membrane elements film silk adopts the material of PVDF, 0.03 micron of nominal membrane pore size.
4. gas maked coal reuse water treatment process according to claim 1 is characterized in that, resin flexibilizer is strong acid gel-type sun resin 001x7 or weak acid macroporous ion-exchange resin D113 in the described step 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210069214 CN103304051A (en) | 2012-03-15 | 2012-03-15 | Coal gas recycle water treatment technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210069214 CN103304051A (en) | 2012-03-15 | 2012-03-15 | Coal gas recycle water treatment technology |
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| CN103304051A true CN103304051A (en) | 2013-09-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445714A (en) * | 2014-11-04 | 2015-03-25 | 深圳能源资源综合开发有限公司 | High-powered recycling process of coal-chemical industry clean wastewater and special device for high-powered recycling process |
-
2012
- 2012-03-15 CN CN 201210069214 patent/CN103304051A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445714A (en) * | 2014-11-04 | 2015-03-25 | 深圳能源资源综合开发有限公司 | High-powered recycling process of coal-chemical industry clean wastewater and special device for high-powered recycling process |
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Application publication date: 20130918 |