CN109534548A - A kind of technology of acidification-composite flocculation pretreatment coal chemical industrial waste water - Google Patents
A kind of technology of acidification-composite flocculation pretreatment coal chemical industrial waste water Download PDFInfo
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- CN109534548A CN109534548A CN201811537844.4A CN201811537844A CN109534548A CN 109534548 A CN109534548 A CN 109534548A CN 201811537844 A CN201811537844 A CN 201811537844A CN 109534548 A CN109534548 A CN 109534548A
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- waste water
- industrial waste
- chemical industrial
- coal chemical
- composite flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention provides a kind of acidification-composite flocculation pretreatment coal chemical industrial waste water technologies, it is handled using settling methods and filter-cloth filtering, concentrated hydrochloric acid acidizing pretreatment, polymeric ferrous sulphate solution, polymeric aluminum chlorides solution, alum solution and the pretreatment of polyacrylamide composite flocculation, it removes the COD of coal chemical industrial waste water and reaches 77% or more, pretreating process is simple and reliable, while economic cost is low.
Description
Technical field
The present invention relates to a kind of environment protection field, specifically a kind of acidification-composite flocculation pretreatment coal chemical industrial waste water skill
Art.
Background technique
Coal chemical industrial waste water pretreatment generally comprises acidization, flocculent precipitation, gas floatation process, MAP chemical precipitation method and solvent
Extracting and dephenolizing method etc..Wherein, the effect of gas floatation process processing coal chemical industrial waste water is general, and power consumption is big, uneconomical；MAP chemistry is heavy
Although comparatively effect is preferable for shallow lake method, solvent extraction dephenolize method, the former higher cost is measured, the latter easily causes secondary dirt
Dye.And acidization can make waste water breaking milk and removing oil, reduce COD (COD)；Flocculent precipitation treating capacity is big, small investment,
Process flow is simple and reliable.Acidization is used alone as preprocess method, the emulsifier in waste water can be made to be changed into emulsification
Performance difference has lost emulsifiability, and is not dissolved in the fatty acid of water, and sedimentation separation comes out in waste water, but
Function and effect are general.Leading to common flocculant includes inorganic flocculating agent, organic flocculant, composite flocculant and Compositional type wadding
Solidifying agent.When flocculation treatment organic wastewater, single flocculant is with dosage is big, effect is poor and is not easy to precipitate.
Summary of the invention
Effect present in current coal chemical industrial waste water pretreatment is poor, investment is big, process flow is complicated in order to solve by the present invention
The case where, acidification-composite flocculation pretreatment coal chemical industrial waste water technology is provided, current coal chemical industrial waste water preconditioning technique is made
Removal rate raising, simple and reliable process, cost reduce.
A kind of technology of acidification-composite flocculation pretreatment coal chemical industrial waste water, step include:
(1) before pre-processing, processing first is filtered to raw coal wastewater from chemical industry, filtered filtrate is stand-by, measures liquor C OD
Value, calculates its COD removal rate；
(2) acidizing pretreatment is carried out to above-mentioned filtrate with the concentrated hydrochloric acid of 35%-45%, after settling 1h, takes supernatant, measured
Supernatant C OD value calculates its COD removal rate；
(3) flocculant is added in the supernatant of step (2) to handle its flocculation sedimentation, again toward mixed liquor after flocculation sedimentation
Middle addition polyacrylamide flocculation aid is stirred for, is staticly settled with the pH value of sodium hydroxide solution or concentrated hydrochloric acid adjustment solution,
It takes wastewater supernatant fluid to measure its COD, calculates its COD removal rate.
Further, the filtration treatment of step (1) is first to carry out settling methods to the biggish tar object of density in waste water
Filtering, then the filtering of middling speed qualitative filter paper or filter cloth mistake are carried out to the low light oil of density ratio water, the lesser solid suspension matter of partial size
Filter.
Further, the pore size of filter cloth and the pore size of filter paper are similar, and the material of filter cloth is terylene, polyamide fibre and third
One of synthetic fibre.
Further, the flocculant of step (1) is in polymeric ferrous sulphate solution, polymeric aluminum chlorides solution and alum solution
It is a kind of.
Further, the agitating mode in step (3) is first quickly to stir 1min, then mix slowly 5-10min.
Still further, the time that staticly settles in step (3) is 30-60min.
In acidification of the invention-composite flocculation pretreatment coal chemical industrial waste water technology, the source process section of waste water is coke
Change process section (coal low temperature distillation, coal medium temperature carbonization, deep processing of coal tar etc.) and lurgi gasifier gasification process section (fixed bed lump coal
Or pressurized gasification, gas washing wastewater of broken coal etc.), the complicated component of the comprehensive wastewater and fluctuation is larger, appearance is in impermeable
Bright brownish black.Based on the above situation, it using double filtration method, need to only carry out, can retain coarse outstanding under gravity
Floating object and the lesser particle of partial size are mitigated waste water later period pretreated burden, are filtered using filter cloth, and it can be used repeatedly,
The replacement and waste of filter paper are reduced, so that save the cost, keeps the removal of coal chemical industrial waste water impurity more thorough, and filtration step operates
Simply, economic cost is low.
The acidization that the present invention uses can make waste water breaking milk and removing oil, reduce COD, and flocculent precipitation treating capacity is big, invests
Less, process flow is simple and reliable.Acid medium is conducive to coal chemical industrial waste water demulsification to generating deposited phenomenon, continuous with pH
It reduces, COD removal rate is improving quickly, and coal chemical industrial waste water can be demulsified quickly and a large amount of agglutinating matters occurs after concentrated hydrochloric acid is added.
When the pH value of waste water drops to after 3, for COD removal rate there is no significant change, COD removal rate has reached 41.06%, continues
Hydrochloric acid is added to turn down the pH value of water sample, the variation of COD removal rate is unobvious.The filtering of middling speed qualitative filter paper is used to remove this after settling 1h
Water sample obviously becomes ground clearly after a little emulsifier floccule bodys, and coloration is significantly reduced, and becomes the orange-yellow liquid of light-permeable.In addition,
The present invention uses the combination of flocculant and flocculation aid, further improves the pretreated COD removal rate of coal chemical industrial waste water.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Embodiment one
Coal chemical industrial waste water after taking acidizing pretreatment adjusts its pH value with sodium hydroxide solution, a certain amount of matter is then added
Amount score be all 5% polymeric ferrous sulphate solution, polymeric aluminum chlorides solution and alum solution, first quickly stirring 1min, after at a slow speed
10min is stirred, then staticly settles 30min, takes supernatant to detect COD removal rate, the results show that polymeric ferrous sulphate solution, poly-
The optimal pH for closing liquor alumini chloridi and alum solution is 8,7,7 respectively.
Embodiment two
With sodium hydroxide solution adjust its pH value to various flocculants optimal pH, it is relatively reasonable according to various flocculants
The 20%-120% of dosage be added different amounts of flocculant into waste water, first quick stirring 1min, after mix slowly
10min, then 30min is staticly settled, then take wastewater supernatant fluid to measure its COD, and calculate COD removal rate.In conjunction with display, gather
The optimal coagulant dose for closing ferric sulfate, aluminium polychloride and alum is 1.0g/L, 0.8g/L and 0.8g/L respectively.
Embodiment three
Coal chemical industrial waste water after taking acidizing pretreatment, the dosage 1.0g/L of fixed bodied ferric sulfate, then use sodium hydroxide
Solution adjust the pH value of waste water and arrive the pH value 8 of Polyferric Sulfate Flocculants, then add different amounts of polyacrylamide, first fastly
Speed stirring 1min, after mix slowly 10min, then staticly settle 30min, supernatant taken to survey its COD, measure its COD, and investigate poly-
Influence of the acrylamide dosage to COD removal rate, the results show that the best of flocculation aid polyacrylamide adds in composite flocculation
Amount is 0.02g/L.
Example IV
Coal chemical industrial waste water after taking acidizing pretreatment, the dosage for fixing bodied ferric sulfate and polyacrylamide are respectively
1.0g/L and 0.02g/L is adjusted the pH value of waste water with sodium hydroxide solution or concentrated hydrochloric acid, first quickly stirs 1min, after
10mn is mixed slowly, then staticly settles 30min, the supernatant of waste water is taken to measure its COD, compares COD removal rate, observes pH value pair
The influence of water treatment effect, the results show that optimal pH and polymerised sulphur when bodied ferric sulfate+polyacrylamide composite flocculation
Optimal pH when sour iron independent role processing coal chemical industrial waste water is the same, is all pH=8.
Embodiment five
Coal chemical industrial waste water after taking acidizing pretreatment, the dosage for fixing bodied ferric sulfate and polyacrylamide are respectively
1.0g/L and 0.02g/L is 8 with the pH value that sodium hydroxide solution adjusts waste water, first quickly stirs 1min, and subsequent mixes slowly
Time is different, then staticly settles 30min, takes the supernatant of waste water to survey its COD, compares its COD removal rate, the results show that most preferably
Mixing slowly the time is 8min.
Embodiment six
Coal chemical industrial waste water after taking acidizing pretreatment, the dosage for fixing bodied ferric sulfate and polyacrylamide are respectively
1.0g/L and 0.02g/L, with sodium hydroxide solution adjust waste water pH value be 8, first quickly stirring 1min, after mix slowly
8min, and time difference is staticly settled, it takes the supernatant of waste water to survey its COD, compares COD removal rate, investigate the sedimentation time to useless
The influence of water COD removal rate, the results show that the optimal sedimentation time is 60min.
Embodiment seven
Three kinds of bodied ferric sulfate, aluminium polychloride and alum flocculants are used in combination with flocculation aid polyacrylamide respectively
The experiment of coal chemical industrial waste water is handled, by their comparisons under respective optimum condition to coal chemical industrial waste water treatment effect,
As a result such as table one, it can be deduced that optimal composite flocculation pretreating scheme is acidification+bodied ferric sulfate+polyacrylamide.
Table 1 handles the effect of coal chemical industrial waste water using different composite flocculation scheme
In conclusion coal chemical industrial waste water pretreatment optimised process of the invention is: coal chemical industrial waste water being filtered, in pH=3
When the filtered waste water of acidizing pretreatment, adjust acidizing pretreatment after waste water pH value be 8, wherein be added 1.0g/L flocculation
Agent bodied ferric sulfate and 0.02g/L flocculation aid polyacrylamide, first quick stirring 1min, after mix slowly 8n, then staticly settle
60min, the solution C OD removal rate highest finally obtained, economic cost are minimum.
Claims (6)
1. a kind of acidification-composite flocculation pretreatment coal chemical industrial waste water technology, step include:
(1) before pre-processing, processing first is filtered to raw coal wastewater from chemical industry, filtered filtrate is stand-by；
(2) acidizing pretreatment is carried out to above-mentioned filtrate with the concentrated hydrochloric acid of 35%-45%, after settling 1h, takes supernatant；
(3) flocculant is added in the supernatant of step (2) to handle its flocculation sedimentation, adds again into mixed liquor after flocculation sedimentation
Enter polyacrylamide flocculation aid, with the pH value of sodium hydroxide solution or concentrated hydrochloric acid adjustment solution, is stirred for, staticly settles.
2. a kind of acidification according to claim 1-composite flocculation pretreatment coal chemical industrial waste water technology, feature exist
It is that settling methods filtering first is carried out to the biggish tar object of density in waste water in: the filtration treatment of the step (1), then to close
It spends the lesser solid suspension matter of the light oil lower than water, partial size and carries out the filtering of middling speed qualitative filter paper or filter-cloth filtering.
3. a kind of acidification according to claim 2-composite flocculation pretreatment coal chemical industrial waste water technology, feature exist
In: the pore size of the filter cloth and the pore size of filter paper are similar, and the material of filter cloth is one in terylene, polyamide fibre and polypropylene fibre
Kind.
4. a kind of acidification according to claim 1-composite flocculation pretreatment coal chemical industrial waste water technology, feature exist
In: the flocculant of institute's step (1) is one of polymeric ferrous sulphate solution, polymeric aluminum chlorides solution and alum solution.
5. a kind of acidification according to claim 1-composite flocculation pretreatment coal chemical industrial waste water technology, feature exist
In: the agitating mode in step (3) is first quickly to stir 1min, then mix slowly 5-10min.
6. a kind of acidification according to claim 1-composite flocculation pretreatment coal chemical industrial waste water technology, feature exist
In: the time that staticly settles in step (3) is 30-60min.
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| CN201811537844.4A CN109534548A (en) | 2018-12-15 | 2018-12-15 | A kind of technology of acidification-composite flocculation pretreatment coal chemical industrial waste water |
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| CN201811537844.4A CN109534548A (en) | 2018-12-15 | 2018-12-15 | A kind of technology of acidification-composite flocculation pretreatment coal chemical industrial waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902878A (en) * | 2019-11-28 | 2020-03-24 | 德州众和环保装备制造有限公司 | Method for reducing hardness of wastewater |
| CN111678759A (en) * | 2020-06-19 | 2020-09-18 | 四川精创检测技术有限公司 | Sample pretreatment method for waste water chloride determination |
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Patent Citations (4)
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| CN101475272A (en) * | 2009-01-22 | 2009-07-08 | 武汉钢铁(集团)公司 | Pretreatment process for oily watewater of cold rolling mill |
| CN104261597A (en) * | 2014-10-27 | 2015-01-07 | 南京工业大学 | Pretreatment method for removing oil from high-concentration sewage in coal chemical industry |
| CN108147612A (en) * | 2016-12-05 | 2018-06-12 | 中国科学院大连化学物理研究所 | A kind of method of dry distillation of coal wastewater treatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902878A (en) * | 2019-11-28 | 2020-03-24 | 德州众和环保装备制造有限公司 | Method for reducing hardness of wastewater |
| CN111678759A (en) * | 2020-06-19 | 2020-09-18 | 四川精创检测技术有限公司 | Sample pretreatment method for waste water chloride determination |
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Application publication date: 20190329 |