CN107285512A - A kind of method and system of Treatment of Wastewater in Coking - Google Patents
A kind of method and system of Treatment of Wastewater in Coking Download PDFInfo
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- CN107285512A CN107285512A CN201710514421.XA CN201710514421A CN107285512A CN 107285512 A CN107285512 A CN 107285512A CN 201710514421 A CN201710514421 A CN 201710514421A CN 107285512 A CN107285512 A CN 107285512A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
A kind of method and system of Treatment of Wastewater in Coking, methods described comprises the steps：(1) acid solution is added into coking chemical waste water, regulation pH value of solution is 26, forms acid water system；(2) dry coke quenching two-stage dust removal coke powder is added into the acid water system, mixes and obtains product after adsorbing；(3) product is carried out after separation of solid and liquid, obtains water outlet and dewatered cake.The system includes dry coke quenching unit, mixing apparatus and solid-liquid separating equipment.The present invention utilizes its excellent absorption property and settling property using two grades of coke powders of dry coke quenching dedusting as adsorbent so that the utilization of coke powder and coking chemical waste water reaches maximization, reduces pollution.Technique is simple, energy-conserving and environment-protective, cost is relatively low, and absorption and effect of settling are preferably, without adding flocculant and flocculating agent, preparation-obtained water-coal-slurry can be directly used for generating electricity and heating, turn waste into wealth, so that the utilization of coke powder and coking chemical waste water reaches maximization, pollution is reduced, is had broad application prospects.
Description
Technical field
The present invention relates to technical field of waste water processing, and in particular to a kind of method and system of Treatment of Wastewater in Coking.
Background technology
Coking chemical waste water be coking, coal gas produced in high-temperature retorting, purification and byproduct removal process containing volatile phenol,
The industrial wastewater of the heterocyclic compound such as polycyclic aromatic hydrocarbon and oxygen, sulphur, nitrogen is a kind of high COD, high volatile phenol, high ammonia nitrogen and is difficult place
The industrial organic waste water of reason.Current coking chemical waste water is after conventional A/A/O PROCESS FOR TREATMENTs, and 90% enterprise faces biochemical tail water
The excessive problem of the indexs such as COD, ammonia nitrogen and colourity.If these waste water, which are back to quenching workshop section, can make coke product Quality Down,
Directly discharge can then cause to continue to endanger to environment, therefore, and the further treatment technique of necessary selection economical and efficient ensures burnt
Change the recycling of waste water and rationally discharge.For coking chemical waste water biological treatment tail water, the deep treatment method used at present
Mainly include Coagulation Method, Fenton oxidation method, Ozonation, membrane separation process and active carbon adsorption etc., these methods respectively have
Advantage and disadvantage.The sludge quantity that Coagulation Method is produced is big, and secondary pollution is serious；Fenton reagent oxidizing process adjusts waste water repeatedly due to needing
PH value, it is with high costs；O3Oxidizing process selectivity is strong, effect is good, but produces O3Cost it is high, realize O3Height in dilute phase reaction
Utilization rate still has many difficulties on project scale；Membrane separation process is strict to influent quality requirement, construction investment and operation
Cost is all very high.Active carbon adsorption is simple to operate, reduced investment, has to the reluctant organic matter of biosystem non-selective
The effect of Adsorption, but its cost is higher, easy saturation, regeneration it is difficult due to, constrain pushing away for active carbon adsorption
Wide application, selects the key that suitable high-efficiency adsorbent is absorption method large-scale application.
Application No. 201310101496.7 discloses a kind of coking waste water treatment process：A. 7%-10% has been crushed
Ground in coking feed coal feeding grater, obtain content and account for ore grinding product of 60% granularity for 200 mesh；B. by coking
Waste water sends into agitator, and ore grinding product is added in coking chemical waste water by 10-20g/L additions is stirred, and is stirred
Product；C. the gravity flow of stirring product enters buffer pool, and feeding dehydration equipment is dehydrated after buffered pond processing, obtains filter cake and filter
Liquid；D. filtrate is sent into conventional biochemical processing procedure and carries out biochemical treatment, obtain meeting the water of discharge standard.Application No.
201410846748.3 disclose a kind of method of advanced treatment on coking wastewater biochemical tail water：(1) absorption is crushed with coal, ground
Coal dust is obtained after ore deposit, is calculated in mass percent, granularity accounts for 80-90wt% less than the particle of 200 mesh in the coal dust；(2) to life
Acid solution is added in coking chemical waste water after change processing, the pH value of water body is adjusted, acid water system is formed, and step (1) is obtained
The coal dust be added in the acid water system stirring and be mixed to get stirring product, the pulverized coal consumption is 20-100g/L；
(3) step (2) the stirring product is introduced into thickener, and adds flocculating agent, flocculant, concentration underflow is filtered,
Obtain dehydration briquette and filtrate；(4) filtrate of step (3) is back to thickener, qualified water outlet is obtained by thickener overflow.But
Above two wastewater processing technology, uses coking feed coal, as adsorbent, to add processing cost after grinding；Inhale simultaneously
The attached settling property difference due to coal dust is, it is necessary to add flocculating agent and flocculant to accelerate adsorbent to settle.Coal dust absorption method has
The advantage such as have adsorbent cheap, simple to operate, but pulverized coal preparation needs the broken bull ring section that consumes energy, adds somewhat to
Its operating cost, if a kind of adsorbent similar to coal dust and fine granularity can be sought, to absorption method in Treatment of Coking Effluent side
The further commercial Application in face is significant.
The content of the invention
Technical problem：The purpose of the present invention is to overcome weak point of the prior art there is provided a kind of method is simple, operation
The convenient, method and system for the Treatment of Wastewater in Coking that processing cost is low, effect is good.
Technical scheme：The method of the Treatment of Wastewater in Coking of the present invention, comprises the steps：
A. sulfuric acid solution is added into coking chemical waste water, regulation pH value of solution is 2-6, forms acid water system；B. to the acid
Property aqueous systems in add dry coke quenching two-stage dust removal coke powder, mix and obtain product after adsorbing；
C. products therefrom is carried out after separation of solid and liquid, obtains water outlet and dewatered cake；
D. clear water is added into dewatered cake, additive is added, water-coal-slurry is mixed to prepare.
The addition of the dry coke quenching two-stage dust removal coke powder added into the acid water system is 10-30g/L.
The specific surface area of the dry coke quenching two-stage dust removal coke powder is 20-40m2/g。
Particle of the granularity less than 0.074mm accounts for 90-95% in the dry coke quenching two-stage dust removal coke powder.
It is described to add the weight ratio of clear water to be 7 into dewatered cake:3-8:2.
Described additive includes dispersant and stabilizer.
Described dispersant is naphthalene sulfonate or lignosulfonates, and the addition of dispersant accounts for dewatered cake and clear water is total
The 0.5-1.0w% of amount.
Described stabilizer is carboxymethyl cellulose or polyacrylamide, and the addition of stabilizer accounts for dewatered cake and clear water
The 0.02-0.1w% of total amount.
A kind of system for realizing above-mentioned Treatment of Wastewater in Coking method, including dry coke quenching unit, mixing apparatus, separation of solid and liquid are set
Standby, pulping equipment and coal water slurry boiler；Described dry coke quenching unit is connected with mixing apparatus, mixing apparatus and solid-liquid separating equipment
Connection；
Described dry coke quenching unit includes the disposable dust remover being connected is exported with coke dry quenching furnace and is connected with coke dry quenching furnace entrance
Secondary filter, described secondary filter bottom is provided with the two-stage dust removal coke powder coke discharging mouthful being directly connected with mixing apparatus；
Coking chemical waste water charging aperture, two-stage dust removal finely-ground coke charging aperture, acid solution is respectively equipped with described mixing apparatus to enter
Material mouth and discharging opening；
Described solid-liquid separating equipment includes concentrating clarifying equipment and disk vacuum filter, and solid-liquid separating equipment is with mixing
The bottom discharge mouthful of equipment is connected, and product is entered in concentrating clarifying equipment by flowing automatically after absorption；
The entrance of disk vacuum filter is connected with the underflow outlet of concentrating clarifying equipment, the filter of disk vacuum filter
Liquid outlet is connected with concentrating clarifying equipment, and the filtered solid outlet of disk vacuum filter is connected with pulping equipment.
A kind of system for realizing above-mentioned Treatment of Wastewater in Coking method, including coking chemical waste water agitator, solid-liquid separating equipment, system
Slurry bucket and coal water slurry boiler；Coking chemical waste water charging aperture, two-stage dust removal finely-ground coke are respectively equipped with described coking chemical waste water agitator
Charging aperture, acid solution charging aperture and discharging opening；The side of coking chemical waste water agitator is provided with dedusting coke powder transmission system, and described consolidates
Liquid separation equipment is connected with the bottom discharge mouthful of agitator；
Described dedusting coke powder transmission system includes the bucket elevator of transmission dry coke quenching two-stage dust removal coke powder, carried with bucket type
The measuring belt that the connected surge bunker of the machine of liter, buffered storehouse send into dry coke quenching two-stage dust removal coke powder in coking chemical waste water agitator；
Described solid-liquid separating equipment includes thickener and disk filter, the underflow of thickener and entering for disk filter
Mouth is connected, and the filtrate input thickener that disk filter is filtered out, qualified water is discharged through overflow, the dehydration of disk filter discharge
Filter cake enters cement slurry preparing barrel, add clear water and slurries additive agent it is well mixed after as fuel enter coal water slurry boiler.
Beneficial effect：Due to using above-mentioned technical proposal, the present invention solves the technique of current Treatment of Wastewater in Coking more
Complexity, cost is higher, the problem of poor processing effect, and the recovery coke powder produced in dry coke quenching production process has specific surface area
Greatly, the features such as settling property is good, by the use of two grades of coke powders of dry coke quenching dedusting as adsorbent, not only twice laid, cost is reduced, and
And using dry coke quenching two grades of coke powders of dedusting excellent absorption property and settling property, Treatment of Wastewater in Coking effect is preferable, and need not
Flocculant and flocculating agent are added, separation of solid and liquid is completed using only thickener and disk filter.Gained water-coal-slurry can be directly used for
Generate electricity or heating so that the utilization of coke powder and coking chemical waste water reaches maximization, reduce pollution.It is biochemical to solve coking chemical waste water
The excessive problem such as COD, colourity in tail water, by adsorbent of dry coke quenching two-stage dust removal byproduct, there is provided a kind of efficient depth
The new technology of Treatment of Wastewater in Coking biochemical tail water, improves qualified water outlet and water-coal-slurry product quality, and its technique is simple, energy-saving ring
Protect, cost is relatively low, and absorption and effect of settling are preferably, without adding flocculant and flocculating agent, preparation-obtained water-coal-slurry can
Generating and heating are directly used in, is turned waste into wealth so that the utilization of coke powder and coking chemical waste water reaches maximization, pollution is reduced,
With wide applicability.
Brief description of the drawings
Fig. 1 is the system block diagram one of Treatment of Wastewater in Coking method of the present invention.
Fig. 2 is the system block diagram two of Treatment of Wastewater in Coking method of the present invention.
Embodiment
The method of Treatment of Wastewater in Coking of the present invention, is comprised the following steps that：
A. sulfuric acid solution is added into coking chemical waste water, regulation pH value of solution is 2-6, forms acid water system；
B. dry coke quenching two-stage dust removal coke powder is added into the acid water system, mixes and obtains product after adsorbing；It is described
The addition of the dry coke quenching two-stage dust removal coke powder added into the acid water system is 10-30g/L；Two grades of the dry coke quenching is removed
The specific surface area of dirt coke powder is 20-40m2/g；Particle of the granularity less than 0.074mm is accounted in the dry coke quenching two-stage dust removal coke powder
90-95%；The acid solution is sulfuric acid solution；
C. products therefrom is carried out after separation of solid and liquid, obtains water outlet and dewatered cake；The product first passes through settlement treatment
Obtain settling underflow, the sedimentation underflow obtains filtrate and dewatered cake after filtration treatment, and the filtrate is returned at sedimentation
Step is managed, water outlet is formed；It is described to add the weight ratio of clear water to be 7 into dewatered cake:3-8:2.
D. clear water is added into dewatered cake, additive is added, water-coal-slurry is mixed to prepare.Described additive includes dividing
Powder and stabilizer.Described dispersant is naphthalene sulfonate or lignosulfonates, the addition of dispersant account for dewatered cake and
The 0.5-1.0w% of clear water total amount.Described stabilizer is carboxymethyl cellulose or polyacrylamide, and the addition of stabilizer is accounted for
The 0.02-0.1w% of dewatered cake and clear water total amount.
As shown in figure 1, a kind of system for realizing above-mentioned Treatment of Wastewater in Coking method, is mainly set by dry coke quenching unit, mixing
Standby, solid-liquid separating equipment, pulping equipment and coal water slurry boiler are constituted；Described dry coke quenching unit is connected with mixing apparatus, mixing
Equipment is connected with solid-liquid separating equipment；
Described dry coke quenching unit includes the disposable dust remover being connected is exported with coke dry quenching furnace and is connected with coke dry quenching furnace entrance
Secondary filter, described secondary filter bottom is provided with the two-stage dust removal coke powder coke discharging mouthful being directly connected with mixing apparatus；
Coking chemical waste water charging aperture, two-stage dust removal finely-ground coke charging aperture, acid solution is respectively equipped with described mixing apparatus to enter
Material mouth and discharging opening；
Described solid-liquid separating equipment includes concentrating clarifying equipment and disk vacuum filter, and solid-liquid separating equipment is with mixing
The bottom discharge mouthful of equipment is connected, and product is entered in concentrating clarifying equipment by flowing automatically after absorption；
The entrance of disk vacuum filter is connected with the underflow outlet of concentrating clarifying equipment, the filter of disk vacuum filter
Liquid outlet is connected with concentrating clarifying equipment, and the filtered solid outlet of disk vacuum filter is connected with pulping equipment.
As shown in Fig. 2 the Treatment of Wastewater in Coking system of another above method, mainly by coking chemical waste water agitator, solid-liquid
Separation equipment, cement slurry preparing barrel and coal water slurry boiler are constituted；Be respectively equipped with described coking chemical waste water agitator coking chemical waste water charging aperture,
Two-stage dust removal finely-ground coke charging aperture, acid solution charging aperture and discharging opening；The side of coking chemical waste water agitator is passed provided with dedusting coke powder
System is sent, described solid-liquid separating equipment is connected with the bottom discharge mouthful of agitator；
Described dedusting coke powder transmission system includes the bucket elevator of transmission dry coke quenching two-stage dust removal coke powder, carried with bucket type
The measuring belt that the connected surge bunker of the machine of liter, buffered storehouse send into dry coke quenching two-stage dust removal coke powder in coking chemical waste water agitator；
Described solid-liquid separating equipment includes thickener and disk filter, the underflow of thickener and entering for disk filter
Mouth is connected, and the filtrate input thickener that disk filter is filtered out, qualified water is discharged through overflow, and it is de- that disk filter is discharged
Water filter cake enters cement slurry preparing barrel, add clear water and slurries additive agent it is well mixed after as fuel enter coal water slurry boiler.
It is a kind of preferred embodiment in, the solid-liquid separating equipment is preferably thickener, the Treatment of Wastewater in Coking
Method and step is as follows：
(1) the coking tail water after biochemical treatment is led in agitator, and industrial waste sulfuric acid is added into agitator, adjusted
The pH value of water body is 2-6, forms acid water system；
(2) dry coke quenching two-stage dust removal coke powder is added to stir in above-mentioned acid water system using bucket elevator and mixed
10min obtains stirring product, and coke powder amount used is 10-30g/L, due to the specific surface area (20-40m that coke powder is larger2/ g) so that
Complete the absorption to organic pollution in coking tail water；
(3) step (2) the stirring product is introduced into thickener, utilizes the good natural subsidence of two-stage dust removal coke powder
Sedimentation underflow can be led into disk vacuum filter to be filtered, obtain filtrate and dewatered cake；
(4) filtrate of step (3) is back in thickener, the supernatant of thickener is qualified water outlet；
(5) dewatered cake that step (3) is obtained by with clear water with 7:3 ratio mixing, while adding 0.5w% point
Water-coal-slurry is made in powder naphthalene sulfonate and 0.02w% stabilizer carboxymethyl cellulose；
Wherein, the adsorbent is two grades of coke powders of dry coke quenching dedusting, and acid solution used is preferably sulfuric acid；Institute in step (2)
The stirring product stated, after natural subsidence, is first filtered, and obtained filtrate is back in thickener, and concentrated machine is obtained
Qualified water outlet.The dehydration briquette, clear water and slurries additive agent are added in cement slurry preparing barrel, shear agitation obtains water-coal-slurry.
The specific embodiment of Treatment of Wastewater in Coking:
Embodiment 1,
(1) it is that 245, COD concentration is that coking tail water after 260mg/L biochemical treatments adds 250ml beakers by 100ml colourities
In, and the sulfuric acid solution that concentration is 1.8mol/L is added into beaker, the pH value of regulation water body is 2, forms acid water system；
(2) 1.5g dry coke quenching two-stage dust removal coke powders accurately are weighed to be added in above-mentioned acid water system, is stirred using small-sized
Device stirring mixing 10min is mixed to obtain stirring product；
(3) step (2) the stirring product is subjected to natural subsidence 5min, obtains COD for 46mg/L, colourity for 50 it is upper
Clear liquid.
Wherein, the coking tail water source is Weifang development coking Co., Ltd, the source of dry coke quenching two-stage dust removal coke powder
For Weifang development coking Co., Ltd, specific surface area is 26.86m2/ g, particle diameter is that -0.074mm accounts for 92%.
Determine COD assay method be：Detected by dichromate titration described in national standard GB 11914-89.
The method of measurement the specific area is：The nitrogen of coke powder is determined using gas absorption instrument (BELSORP-max ver 2.1)
Gas adsorption/desorption isotherms, determine pressure p/p0=10-7~1.The specific surface area of coke powder is calculated using multiple spot BET method.
Determine particle diameter method be：The particle diameter of coke powder, wet method are determined with laser particle size analyzer (Microtrac S3500)
Sample introduction, decentralized medium is water, and particle diameter is the volume statistical result of quantity base.
Embodiment 2, as shown in figure 1,
2.1. dry coke quenching unit：Including coke dry quenching furnace, dress coke installation and coke discharging dress are respectively arranged with the top and bottom of coke dry quenching furnace
Put, coke dry quenching furnace flue gas outlet is connected with disposable dust remover, secondary filter and blower fan, the blower fan and coke dry quenching furnace bottom in turn
Blast orifice is connected；
Red Jiao released from coke furnace carbonization chamber by filling coke installation enters coke dry quenching furnace, with after inert gas countercurrent flow from dry
Put out the discharging device for coke discharge of furnace bottom.Inert gas after heating flows out through flue gas, is changed after disposable dust remover dedusting
Heat, is pressurizeed after secondary filter dedusting by blower fan again after cooling, is recycled into coke dry quenching furnace, the secondary filter
Bottom is provided with two-stage dust removal coke powder coke discharging mouthful.The thick coke powder that one-time dedusting is obtained feeds boiler and heated, what final dusting was obtained
Finely-ground coke enters wastewater treatment link；
2.2 mixing apparatus：Final dusting coke powder is added in mixing apparatus, mixing arrangement is additionally provided with coking chemical waste water charging
Mouth and acidic solution inlet；
2.3 solid-liquid separating equipment：Connected with mixing apparatus discharging opening, be provided with out water out and underflow outlet, and underflow
Outlet is connected with following disk vacuum filters；
2.4 disk vacuum filter：The sedimentation underflow of solid-liquid separating equipment enters after disk vacuum filter, gained filtrate
It is recycled back in solid-liquid separating equipment, obtains qualified water outlet from water out discharge is gone out, filter cake enters system obtained by disk vacuum filter
Equipment is starched to prepare water-coal-slurry.
Embodiment 3, as shown in Figure 2
The device of Treatment of Wastewater in Coking described in the present embodiment is similar to Example 2, differs only in：Bucket lifting is used
Machine, surge bunker and measuring belt, replace mixing apparatus and pulping equipment, solid-liquid separating equipment is respectively with agitator and cement slurry preparing barrel
Thickener.The step of Treatment of Wastewater in Coking, is as follows：
(1) it is 178mg/L by COD, colourity is led in agitator for the coking tail water 30L after 213 biochemical treatment, and to
Industrial waste sulfuric acid is added in agitator, the pH value of regulation water body is 3.4, forms acid water system；
(2) dry coke quenching two-stage dust removal coke powder is promoted in surge bunker using bucket elevator, added by measuring belt
Into above-mentioned acid water system, stirring mixing 10min obtains stirring product, and coke powder amount used is 10g/L；
(3) step (2) the stirring product is introduced into thickener, utilizes the good natural subsidence of two-stage dust removal coke powder
Sedimentation underflow can be led into disk vacuum filter to be filtered, obtain filtrate and dewatered cake；
(4) filtrate of step (3) is back in thickener, obtains COD for 37mg/L, colourity is 46 qualified water outlet.
(5) dewatered cake that step (3) is obtained by with clear water with 7:3 ratio mixing, while adding 0.6% (w%)
Dispersant 1-naphthalene sulfonic aicd sodium salt (C10H7SO3Na) with 0.04w% stabilizer sodium carboxymethylcellulose ([C6H7O2(OH)2CH2COONa] water-coal-slurry n) is made.
Wherein, the source of coking tail water is coking of coal Co., Ltd of Inner Mongol American side, and the source of industrial waste sulfuric acid is：
Coking of coal Co., Ltd of Inner Mongol American side；
Dry coke quenching source is Weifang development coking Co., Ltd, and the specific surface area of the dry coke quenching is 26.86m2/ g, grain
Footpath -0.074mm accounts for 92%.
Embodiment 4,
(1) it is 197mg/L by COD, colourity is led in agitator for the coking tail water 15L after 221 biochemical treatment, and to
Industrial waste sulfuric acid is added in agitator, the pH value of regulation water body is 4, forms acid water system；
(2) dry coke quenching two-stage dust removal coke powder is added to above-mentioned acid water system using bucket elevator and measuring belt
Middle stirring mixing 10min obtains stirring product, and coke powder amount used is 18g/L；
(3) step (2) the stirring product is introduced into thickener, utilizes the good natural subsidence of two-stage dust removal coke powder
Sedimentation underflow can be led into disk vacuum filter to be filtered, obtain filtrate and dewatered cake；
(4) filtrate of step (3) is back in thickener, obtains COD for 42mg/L, colourity is 39 qualified water outlet；
(5) dewatered cake that step (3) is obtained by with clear water with 7:3 ratio mixing, while adding 0.5% (w%)
Dispersant sodium metnylene bis-naphthalene sulfonate and 0.02w% stabilizer polyacrylamide water-coal-slurry is made.
Wherein, the source of coking tail water is Shandong Rong Xin coalifications Co., Ltd, and the source of industrial waste sulfuric acid is：Inner Mongol
Ancient American side's coking of coal Co., Ltd；Dry coke quenching source is：Weifang development coking Co., Ltd, the ratio surface of the dry coke quenching
Product：26.86m2/ g, particle diameter -0.074mm accounts for 92%.
Embodiment 5,
It is similar to Example 3, differ only in：Coke powder amount used is 30g/L in step (2).As a result show：It is available
COD is 25mg/L, and colourity is 32 qualified water outlet.
Embodiment 6,
It is similar to Example 3, differ only in：
Step (5) by dewatered cake by with clear water with 8：2 ratio mixing, while the dispersant 1- naphthalenes of addition 1.0%
Sulfonate sodium (C10H7SO3Na) stabilizer the sodium carboxymethylcellulose ([C with 0.04%6H7O2(OH)2CH2COONa] water n) is made
Coal slurry.
Embodiment 7,
It is similar to Example 6, differ only in：
Step (5) by dewatered cake by with clear water with 8：2 ratio mixing, while the dispersant 1- naphthalenes of addition 0.6%
Sulfonate sodium (C10H7SO3Na) stabilizer the sodium carboxymethylcellulose ([C with 0.1%6H7O2(OH)2CH2COONa] water n) is made
Coal slurry.
Comparative example 1,
Comparative example 1 is similar to Example 1, and it is coal dust to differ only in comparative example 1 sorbent used：Coking coal is crushed and ground
Mill, the material content for yielding less than 200 mesh accounts for 90wt% product, i.e. coal dust.
According to the identical step of embodiment 1, as a result show：Static balance time described in step (3) is 360min, is obtained
COD is 130mg/L, and colourity is 123 supernatant.
Comparative example 2,
Comparative example 2 is similar to Example 1, and it is dry coke quenching primary dust removing coke powder to differ only in comparative example 2 sorbent used
(wherein specific surface area is 18.4m220%)/g, -0.074mm account for, and according to the identical step of embodiment 1, as a result show, step
(3) static balance time described in is 3min, obtains COD for 92mg/L, and colourity is 103 supernatant.
Comparative example 3,
Comparative example 3 is similar to Example 1, the step of differing only in comparative example 1 without addition sulfuric acid solution, according to reality
The identical step of example 1 is applied, is as a result shown：Static balance time described in step (3) is 5min, obtains COD for 107mg/L, color
Spend the supernatant for 134.
Comparative example 4,
Comparative example 4 is similar to Example 1, differs only in sulfuric acid described in embodiment 1 replacing hydrochloric acid, according to implementation
The identical step of example 1, as a result shows：Static balance time described in step (3) is 5min, obtains COD for 67mg/L, colourity is
52 supernatant.
Claims (10)
1. a kind of method of Treatment of Wastewater in Coking, it is characterised in that comprise the steps：
A. sulfuric acid solution is added into coking chemical waste water, regulation pH value of solution is 2-6, forms acid water system；
B. dry coke quenching two-stage dust removal coke powder is added into the acid water system, mixes and obtains product after adsorbing；
C. products therefrom is carried out after separation of solid and liquid, obtains water outlet and dewatered cake；
D. clear water is added into dewatered cake, additive is added, water-coal-slurry is mixed to prepare.
2. a kind of method of Treatment of Wastewater in Coking according to claim 1, it is characterised in that：It is described to the acidic bodies of water
The addition of the dry coke quenching two-stage dust removal coke powder added in system is 10-30g/L.
3. a kind of method of Treatment of Wastewater in Coking according to claim 1 or 2, it is characterised in that：Two grades of the dry coke quenching
The specific surface area of dedusting coke powder is 20-40m2/g。
4. a kind of method of Treatment of Wastewater in Coking according to claim 1 or 2, it is characterised in that：Two grades of the dry coke quenching
Particle of the granularity less than 0.074mm accounts for 90-95% in dedusting coke powder.
5. a kind of method of Treatment of Wastewater in Coking according to claim 1, it is characterised in that：It is described to add into dewatered cake
The weight ratio of clear water is 7:3-8:2.
6. a kind of method of Treatment of Wastewater in Coking according to claim 1, it is characterised in that：Described additive includes dividing
Powder and stabilizer.
7. a kind of method of Treatment of Wastewater in Coking according to claim 6, it is characterised in that：Described dispersant is naphthalene sulphur
Hydrochlorate or lignosulfonates, the addition of dispersant account for the 0.5-1.0w% of dewatered cake and clear water total amount.
8. a kind of method of Treatment of Wastewater in Coking according to claim 6, it is characterised in that：Described stabilizer is carboxylic first
Base cellulose or polyacrylamide, the addition of stabilizer account for the 0.02-0.1w% of dewatered cake and clear water total amount.
9. a kind of system for realizing Treatment of Wastewater in Coking method described in claim 1, it is characterised in that：It includes dry coke quenching list
Member, mixing apparatus, solid-liquid separating equipment, pulping equipment and coal water slurry boiler；Described dry coke quenching unit is connected with mixing apparatus,
Mixing apparatus is connected with solid-liquid separating equipment；
It is secondary that described dry coke quenching unit includes exporting the disposable dust remover that is connected with coke dry quenching furnace and with coke dry quenching furnace entrance be connected
Deduster, described secondary filter bottom is provided with the two-stage dust removal coke powder coke discharging mouthful being directly connected with mixing apparatus；
Coking chemical waste water charging aperture, two-stage dust removal finely-ground coke charging aperture, acid solution charging aperture are respectively equipped with described mixing apparatus
And discharging opening；
Described solid-liquid separating equipment includes concentrating clarifying equipment and disk vacuum filter, solid-liquid separating equipment and mixing apparatus
Bottom discharge mouthful be connected, product passes through to flow automatically and entered in concentrating clarifying equipment after absorption；
The entrance of disk vacuum filter is connected with the underflow outlet of concentrating clarifying equipment, and the filtrate of disk vacuum filter goes out
Mouth is connected with concentrating clarifying equipment, and the filtered solid outlet of disk vacuum filter is connected with pulping equipment.
10. a kind of system for realizing Treatment of Wastewater in Coking method described in claim 1, it is characterised in that：It includes coking chemical waste water
Agitator, solid-liquid separating equipment, cement slurry preparing barrel and coal water slurry boiler；Coking chemical waste water is respectively equipped with described coking chemical waste water agitator
Charging aperture, two-stage dust removal finely-ground coke charging aperture, acid solution charging aperture and discharging opening；The side of coking chemical waste water agitator is provided with dedusting
Coke powder transmission system, described solid-liquid separating equipment is connected with the bottom discharge mouthful of agitator；
Described dedusting coke powder transmission system includes the bucket elevator and bucket elevator of transmission dry coke quenching two-stage dust removal coke powder
The measuring belt that connected surge bunker, buffered storehouse send into dry coke quenching two-stage dust removal coke powder in coking chemical waste water agitator；
Described solid-liquid separating equipment includes thickener and disk filter, the underflow of thickener and the entrance phase of disk filter
Even, the filtrate input thickener that disk filter is filtered out, qualified water is discharged through overflow, the dewatered cake of disk filter discharge
Into cement slurry preparing barrel, add clear water and slurries additive agent it is well mixed after as fuel enter coal water slurry boiler.
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| CN114196452A (en) * | 2021-12-23 | 2022-03-18 | 新疆中泰创新技术研究院有限责任公司 | Method for preparing high-alkali coal-water coal slurry from coking wastewater |
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