CN104891721A - Method for advanced treatment of coking wastewater - Google Patents
Method for advanced treatment of coking wastewater Download PDFInfo
- Publication number
- CN104891721A CN104891721A CN201510324582.3A CN201510324582A CN104891721A CN 104891721 A CN104891721 A CN 104891721A CN 201510324582 A CN201510324582 A CN 201510324582A CN 104891721 A CN104891721 A CN 104891721A
- Authority
- CN
- China
- Prior art keywords
- treatment
- flocculation
- iron
- post
- mentioned steps
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to a method for advanced treatment of coking wastewater. The method comprises the following steps: (1) performing column packing: soaking iron scraps in dilute sulphuric acid and a dilute NaOH solution respectively, smashing coke, uniformly mixing the iron scraps and coke according to the volume ratio of 12:1, and filling an iron carbon column with the mixture; (2) adding a flocculant in the coking wastewater subjected to the column packing treatment for flocculation and sedimentation treatment; (3) performing acidification on the wastewater; (4) performing column-passing treatment on the acidated wastewater to enable the wastewater to enter from the bottom of the iron carbon column and flow out from the upper part of the iron carbon column; (5) performing neutralizing treatment and sedimentation; (6) repeatedly performing the steps (2) to (5) on supernatant obtained in the step (5); (7)performing sand filtration treatment. According to the invention, the process is simple, required equipment during implementation is simple, the operation is convenient, the effect is excellent and rapid, the required chemicals and reagents are cheap and available, and the device is low in operating cost and higher in practicality.
Description
Technical field:
The present invention relates to one to be applied in sewage environment protection treatment field, particularly relate to a kind of method for advanced treatment on coking wastewater.
Background technology
Coking chemical waste water is the waste water produced in coal coke, gas purification and coke chemicals removal process.The feature of this waste water is that COD, ammonia nitrogen concentration are high, containing inorganic salts such as a large amount of ammonium salts, sulfide, prussiates, and organic components is complicated, mainly contain phenolic compound, polycyclc aromatic compound, heterogeneous ring compound and fats compound, and Pollutant levels are high, belong to bio-refractory organic waste water.Coking chemical waste water generally will pass through one-level pre-treatment, secondary biochemical treatment and advanced treatment and could discharge.At present, coking chemical waste water is after secondary biochemical treatment, and water outlet COD, total phenol, ammonia and nitrogen pollution substrate concentration are still very high, and color and luster is comparatively dark, does not reach discharging standards, therefore must process coking tail water.The method of existing coking tail water process mainly contains flocculation sediment filtration method, absorption method, membrane separation process, chemical oxidization method, break point chlorination method, immobilized biotechnology and Powdered Activated Carbon method etc., these methods cut both ways, not that one-time investment is too large, control expense is high, be exactly complex process, poor effect, be all difficult to reach emission standard and obtain promising result.
Given this, in Chinese patent 200610151008.3, mention a kind of advanced treatment method for carbonization wastewater, it carries out according to the following steps: (one) passes into flocculation basin through the coking chemical waste water of common process and adds chemistry one biological composite flocculation agent; (2) sand filtration post is pumped into; (3) aeration is carried out to the waste water through sand filtration, pass into afterwards in immobilized biological activated carbon reactor and stop 30 ~ 40min, get final product water outlet; Be provided with immobilized biological activated carbon post in the immobilized biological activated loft reactor of step (three), immobilized biological activated carbon post is fixed with engineering bacteria.Although this advanced treatment method for carbonization wastewater operating process is relatively simple to a certain extent, the effect of its Treatment of Coking Effluent is poor, and take effect comparatively slow, the pollutent in waste water cannot be processed to greatest extent, and water outlet is difficult to reach emission standard.
A kind of deep treatment method of coking chemical waste water is mentioned in Chinese patent 201410201208.X, adopt the steps such as electrolysis, flocculation, advanced treatment, draining for the treatment of the coking chemical waste water after Biochemical method, after the process of traditional biological facture, chroma in waste water is larger, COD concentration can not meet emission standard, and residual a small amount of phenols and prussiate.Although this treatment process can process coking chemical waste water to a certain extent, but operating procedure relative complex, loaded down with trivial details, the pharmaceutical chemicals needed in treating processes is also relatively many, and the processing cost of coking chemical waste water is higher, efficiency is lower, economical and practical not, be unfavorable for large-scale promotion application.
A kind of deep treatment method of coking chemical waste water is mentioned in another Chinese patent 201410677839.9, comprise the following steps: the water outlet of coking wastewater biochemical is adsorbed after the slurrying of converter dust-removing ash in contact tank, supernatant liquor after absorption enters preliminary sedimentation tank and carries out preliminary solid-liquid separation, supernatant liquor after separation enters the further solid-liquid separation of second pond after adding coagulating agent flocculation, and finally filtration or ultrafiltration are to standard water discharge.Although this treatment process operating procedure is relatively simple, cost is lower to a certain extent, and its water treatment effect is general, and advanced treatment cannot fall pollutent in waste water, water outlet is difficult to reach emission standard.
In sum, be necessary to do perfect further to prior art.
Summary of the invention:
The present invention is to solve the complex treatment process, the poor effect that exist in the prior art mentioned in above-mentioned background technology, filler easily hardens, water outlet is difficult to reach the technical problems such as emission standard, and it is simple to propose a kind of technical process, and technique required equipment is simple, easy to operate, effective, instant effect, medicine used and reagent cheap and easy to get, the expense of plant running is low, has the method for advanced treatment on coking wastewater of very high practicability.
The present invention is achieved by the following technical solutions:
A kind of above-mentioned method for advanced treatment on coking wastewater, is characterized in that, comprise the following steps:
(1) fill post, namely first soak waste iron filing with diluted acid and dilute alkaline soln respectively, more fully wash iron filings with clear water, meanwhile, pulverized by coke, get the coke crushed, the volume ratio being 10-13:1 in iron filings and coke ratio mixes rear loading iron carbon post;
(2) flocculation treatment, is about to the coking chemical waste water after the process of above-mentioned steps (1) dress post, adds concentration range and carry out flocculation postprecipitation at the flocculation agent of 2-3g/L;
(3) acidification, is about to the supernatant liquor after above-mentioned steps (2) flocculation treatment precipitation, adds concentrated acid and be modulated into the solution that pH value is 3, staticly settle;
(4) post process is crossed, be about to supernatant liquor after above-mentioned steps (3) acidification leaves standstill adopt and reverse-flowly first enter water head tank, then waste water is made to enter from the bottom of iron carbon post, top is flowed out, controlling water inlet flow velocity is 3-5mL/min, and air compressor is opened while waste water enters, adjustment flow, makes the iron carbon filler in iron carbon post be in fluidized state;
(5) neutralizing treatment, is about to cross the top water outlet after post process through above-mentioned steps (4), is modulated into the solution of pH value range between 8-9 with the milk of lime that concentration is 4%-5%, and postprecipitation;
(6) be the operation that supernatant liquor after above-mentioned steps (5) neutralizing treatment being precipitated repeats in above-mentioned steps (2)-(5);
(7) sand filtration process, the waste water processed by above-mentioned steps (6) imports sand-bed filter, controls filtering velocity 6-8m/h, to retain more tiny throw out, water outlet COD can be down to 50-60mg/L, and SS can be down to 20-30mg/L, colourity close to colourless, to reach emission standard.
The described method for advanced treatment on coking wastewater, wherein: that in described step (1), dilute acid soln adopts is rare H
2sO
4solution, the dilute NaOH solution that dilute alkaline soln adopts.
The described method for advanced treatment on coking wastewater, wherein: be coke is ground into the granularity of granularity near iron filings in described step (1), get the coke crushed, the volume ratio being 12:1 in iron filings and coke ratio mixes rear loading iron carbon post.
The described method for advanced treatment on coking wastewater, wherein: be adopt FeCl in described step (2)
3as flocculation agent; Described step (2) flocculation treatment is by adding flocculation agent FeCl
3after, positive 3 valency Fe ions are at dissociation in water, and its hydrolysate has cohesion and flocculation two kinds of effects concurrently; Positive 3 valency Fe ions also hydrolyzable generate Fe (OH)
3colloid, to adsorb the suspended particle in waste water, makes the granulated in dispersion state reticulate structure, becomes more thick flocs unit and precipitate.
The described method for advanced treatment on coking wastewater, wherein: that the concentrated acid in described step (3) adopts is dense H
2sO
4; Described step (3) acidification is changed at the solubleness of phenols, ammonia nitrogen substances, impels it to separate out; Meanwhile, sulfide also can react and generate corresponding gas and precipitation.
The described method for advanced treatment on coking wastewater, wherein: comprise a microelectrolysis processing waste water process in described step (4), specifically comprise electrochemical reaction, redox reaction and electro-coagulation.
The described method for advanced treatment on coking wastewater, wherein: be adopt concentration to be the milk of lime of 5% in described step (5).
The described method for advanced treatment on coking wastewater, wherein: be utilize quartz sand filter media to retain more tiny throw out in described step (7).
Beneficial effect:
The method technical process that the present invention is used for advanced treatment on coking wastewater is simple, it utilizes soda acid immersion iron filings can remove the impurity spot on its surface, coke and iron filings granularity are close to it can be made to mix, be conducive to the carrying out of the reactions such as light electrolysis, simultaneously, gac has larger specific surface area, mainly physical adsorption occurs by intermolecular effect, utilizes the gac of light electrolysis post can play the effect of absorption and decolouring to waste water; Afterwards, by adding FeCl
3after, positive 3 valency Fe ions are at dissociation in water, and its hydrolysate has cohesion and flocculation two kinds of effects concurrently, can adsorb the suspended particle in waste water, makes the granulated in dispersion state reticulate structure, becomes more thick flocs unit and precipitate; Again, the solubleness of the material such as phenols, ammonia nitrogen in solution can be made to change, impel it to separate out by acidifying, meanwhile, the materials such as sulfide also can react and generate corresponding gas and precipitation, are convenient to removing; In addition, adopt reverse-flow and regulate suitable flow velocity, can make waste water, in post, electrochemical reaction, redox reaction and electro-coagulation etc. fully occur, thus reduce COD and the colourity of solution, in addition, in post, iron carbon filler is in fluidisation shape, can increase oxygen level in post, be conducive to the generation of redox reaction, and avoid iron carbon to lump; And add milk of lime and adjust pH value of solution when being 8-9, produce a large amount of Fe (OH)
2, Fe (OH)
3colloidal solid, other suspended substance in absorption waste water, simultaneously under the prerequisite of coagulant aids made by milk of lime, forms siderotil flower, has very strong Coagulation and Adsorption effect; Finally by sand filtration process, can more tiny suspended particulate be removed, reach the object of purifying liquid waste.Whole method technique required equipment is simple, easy to operate, effective, instant effect, medicine used and reagent cheap and easy to get, the expense of plant running is low, has very high practicability.
Accompanying drawing illustrates:
Fig. 1 is the process flow sheet of the method for the invention;
Fig. 2 is the structural representation of the iron carbon post for implementing the method for the invention;
1-cylindrical shell in figure, 2-baffle plate, 3-iron carbon filler, 4-water inlet pipe, 5-inlet pipe, 6-effluent weir, 7-rising pipe, 8-charging opening, 9-pillar.
Embodiment:
As shown in Figure 1, 2, the present invention is used for the method for advanced treatment on coking wastewater, and it specifically comprises the following steps:
S010, dress post,
Namely first rare H is used respectively
2sO
4(or rare HCl) and dilute NaOH solution (or with the NaCO of concentration 10%
3but need heating) soak waste iron filing, fully iron filings are washed again with clear water, simultaneously, coke is ground into the granularity of granularity near iron filings, get the iron filings handled well, the volume ratio being then 10-13:1 (in the present embodiment, iron filings and coke ratio are 12:1) in iron filings and coke ratio mixes rear loading iron carbon post.
S020, flocculation treatment
The coking chemical waste water be about to after the process of dress post adds flocculation agent FeCl
3(concentration range of flocculation agent is between 2-3g/L) carries out flocculation postprecipitation; Wherein, flocculation treatment process is mainly by adding flocculation agent FeCl
3after, positive 3 valency Fe ions are at dissociation in water, and its hydrolysate has cohesion and flocculation two kinds of effects concurrently; Positive 3 valency Fe ions also hydrolyzable generate Fe (OH)
3colloid, its surface-area is very large, and activity is higher, can adsorb the suspended particle in waste water, makes the granulated in dispersion state reticulate structure, becomes more thick flocs unit and precipitate.
S030, acidification
Be about to the supernatant liquor after above-mentioned steps S020 flocculation treatment precipitation, add dense H
2sO
4(or dense HCl) is modulated into the solution that pH value is 3, staticly settles; Wherein, by acidification, the solubleness of the material such as phenols, ammonia nitrogen is changed, impels it to separate out; Meanwhile, the materials such as sulfide also can react and generate corresponding gas and precipitation, are convenient to removing.
S040, excessively post process
Be about to supernatant liquor after above-mentioned steps S030 acidification leaves standstill adopt and reverse-flowly first enter water head tank, then waste water is made to enter from the bottom of iron carbon post (it is 3-5mL/min that control waste water enters flow velocity), top is flowed out, and air compressor is opened while waste water enters, adjustment flow, makes the iron carbon filler in iron carbon post be in fluidized state; Wherein, comprise a microelectrolysis processing waste water process in this step, there is multiple reaction mechanism, be mainly electrochemical reaction, redox reaction and electro-coagulation; Organic removal and the main reactive behavior relying on [H] of nascent state and newly exposed iron atom to have of decolouring in waste water; In the electrolyte, iron filings and carbon granules form small galvanic cell, and iron filings constantly lose electronics and the consumption that is corroded as anode, and carbon granules, as negative electrode, is H
+and O
2obtain electronics and place is provided; In acid condition, the galvanic corrosion constantly carrying out iron filings makes a large amount of positive divalent Fe ion enter solution, and not only effectively overcome the passivation of anode, the positive divalent Fe ion of synkaingenesis state also has deoxidization, degradation effect to pollutent; Positive divalent Fe ion generates positive 3 valency Fe ions after participating in redox reaction, because reaction later stage solution ph raises, positive divalent Fe ion, positive 3 valency Fe ions are hydrolyzed into the complex compound of iron, can play effective absorption, cohesion and co-precipitation to other colloid in waste water and suspended substance; Carbon granules not only has very bigger serface and containing a large amount of unsaturated link(age) and oxygen-content active group on its microcosmic surface, have absorption and decolorization to organic molecule in quite wide pH value range.
S050, neutralizing treatment
Be about to cross the top water outlet after post process through above-mentioned steps S040, be modulated into the solution of pH value range between 8-9 with the milk of lime that concentration is 4-5% (adopting 5% in the present embodiment), and postprecipitation; Wherein, be by a large amount of positive divalent Fe ion, the positive 3 valency Fe ions in solution in microelectrolysis process in this step, be adjusted to after pH is 8-9 by adding 5% milk of lime, produce a large amount of Fe (OH)
2, Fe (OH)
3colloidal solid, other suspended substance in absorption waste water, simultaneously under the prerequisite of coagulant aids made by milk of lime, forms siderotil flower, has very strong Coagulation and Adsorption effect, to reach the object of purifying liquid waste.
S060, be the operation supernatant liquor in above-mentioned steps S050 repeated in above-mentioned steps S020-S050.
S070, sand filtration process
Waste water by above-mentioned steps S060 process imports sand-bed filter, and control filtering velocity 6-8m/h, utilize quartz sand filter media to retain more tiny throw out, water outlet COD can be down to 50-60mg/L, and SS can be down to 20-30mg/L, and colourity, close to colourless, reaches emission standard.
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
The method for advanced treatment on coking wastewater of the embodiment of the present invention 1, specifically comprises the following steps:
S110, to get waste iron filing some, with dilute sulphuric acid, iron filings soaked the oxide compound removing its surface, then soak with dilute NaOH solution, remove the greasy dirt on its surface, more fully wash iron filings with clear water; Coke being ground into the granularity of granularity near iron filings, getting the iron filings handled well, is then that 12:1 (volume ratio) mixes in iron filings and coke ratio, dress post;
S120, the coking chemical waste water after secondary biochemical treatment is entered flocculation basin, add flocculation agent FeCl by 3g/L
3, staticly settle;
S130, above-mentioned steps S120 flocculation treatment is left standstill after supernatant liquor enter acidification pond, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle;
S140, above-mentioned steps S130 acidification is left standstill after supernatant liquor enter in water head tank with reverse-flow, namely intake bottom pillar, top water outlet, and regulate water inlet flow velocity to be 4mL/min, open air compressor simultaneously, adjust desired flow, make iron carbon filler in post be in fluidisation shape;
S150, the top water outlet after crossing post process through above-mentioned steps S140 is entered neutralization precipitation pond, adjust solution ph to be 8-9 with 5% milk of lime, staticly settle;
S160, the supernatant liquor after leaving standstill is entered flocculation basin carry out secondary flocculation treatment through the process of above-mentioned steps S150 neutralization precipitation, add flocculation agent FeCl by 3g/L
3, staticly settle; Supernatant liquor after secondary flocculation treatment being left standstill enters acidification pond and carries out after-souring process, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle; Supernatant liquor employing after after-souring process being left standstill is reverse-flow to be entered in water head tank, and keep draining flow velocity to be 4mL/min, top water outlet enters neutralization precipitation pond and carries out Two-step neutralization precipitation process, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime; Supernatant liquor after Two-step neutralization precipitation process being left standstill enters flocculation basin and carries out three flocculation treatment, adds flocculation agent FeCl by 3g/L
3, staticly settle; Supernatant liquor after flocculating three times again enters acidification pond and carries out three acidifyings, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle; Enter in water head tank by reverse-flow for the supernatant liquor employing after three acidifyings, keep water inlet flow velocity to be 4mL/min, top water outlet enters neutralization precipitation pond and carries out three neutralization precipitations, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime;
S170, above-mentioned steps S160 tri-neutralization precipitation process are left standstill after supernatant liquor enter sand-bed filter, control filtering velocity 6m/h, water outlet COD drops to 53mg/L by 236mg/L, and SS drops to 24mg/L by 162mg/L, and colourity is close to colourless.
The method technical process for advanced treatment on coking wastewater of the embodiment of the present invention 1 is simple, it utilizes soda acid immersion iron filings can remove the impurity spot on its surface, coke and iron filings granularity are close to it can be made to mix, be conducive to the carrying out of the reactions such as light electrolysis, simultaneously, gac has larger specific surface area, mainly physical adsorption is there is by intermolecular effect, utilize the gac of light electrolysis post can play the effect of absorption and decolouring to waste water, whole method is easy to operate, effective, instant effect, medicine used and reagent cheap and easy to get, the expense of plant running is low, there is very high practicability.
Embodiment 2
The method for advanced treatment on coking wastewater of the embodiment of the present invention 2, specifically comprises the following steps:
S210, to get waste iron filing some, with dilute sulphuric acid, iron filings soaked the oxide compound removing its surface, then soak with dilute NaOH solution, remove the greasy dirt on its surface, more fully wash iron filings with clear water; Coke being ground into the granularity of granularity near iron filings, getting the iron filings handled well, is then that 12:1 (volume ratio) mixes in iron filings and coke ratio, dress post;
S220, the coking chemical waste water after secondary biochemical treatment is entered flocculation basin, add flocculation agent FeCl by 2g/L
3, staticly settle;
S230, the supernatant liquor after leaving standstill through above-mentioned steps S220 flocculation treatment is entered acidification pond, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle;
S240, the supernatant liquor after leaving standstill adopted reverse-flowly enter in water head tank through above-mentioned steps S230 acidification, namely intake bottom pillar, top water outlet, and regulate water inlet flow velocity to be 3mL/min, open air compressor simultaneously, adjust desired flow, make iron carbon filler in post be in fluidisation shape;
S250, the top water outlet after crossing post process through above-mentioned steps S240 is entered neutralization precipitation pond, adjust solution ph to be 8-9 with 5% milk of lime, staticly settle;
S260, the supernatant liquor after leaving standstill is entered flocculation basin carry out secondary flocculation treatment through the process of above-mentioned steps S250 neutralization precipitation, add flocculation agent FeCl by 2g/L
3, staticly settle; Supernatant liquor after secondary flocculation treatment being left standstill enters acidification pond and carries out after-souring process, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle; Supernatant liquor employing after after-souring process being left standstill is reverse-flow to be entered in water head tank, and keep water inlet flow velocity to be 3mL/min, top water outlet enters neutralization precipitation pond and carries out Two-step neutralization precipitation process, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime; Supernatant liquor after Two-step neutralization precipitation process being left standstill enters flocculation basin and carries out three flocculation treatment, adds flocculation agent FeCl by 2g/L
3, staticly settle; Supernatant liquor after three flocculation treatment being left standstill enters acidification pond and carries out three acidification, enriching H
2sO
4adjust pH value of solution to be 3, staticly settle; Supernatant liquor employing after three acidification being left standstill is reverse-flow to be entered in water head tank, and keep water inlet flow velocity to be 3mL/min, top water outlet enters neutralization precipitation pond and carries out three neutralization precipitation process, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime;
S270, above-mentioned steps S260 tri-neutralization precipitation process are left standstill after supernatant liquor enter sand-bed filter, control filtering velocity 8m/h, water outlet COD drops to 52mg/L by 236mg/L, and SS drops to 22mg/L by 162mg/L, and colourity is close to colourless.
Embodiment 3
S310, to get waste iron filing some, with dilute sulphuric acid, iron filings soaked the oxide compound removing its surface, then soak with dilute NaOH solution, remove the greasy dirt on its surface, more fully wash iron filings with clear water.Coke being ground into the granularity of granularity near iron filings, getting the iron filings handled well, is then that 12:1 (volume ratio) mixes in iron filings and coke ratio, dress post;
S320, the coking chemical waste water after secondary biochemical treatment is entered flocculation basin, add flocculation agent FeCl by 2g/L
3, staticly settle;
S330, the supernatant liquor after leaving standstill through above-mentioned steps S320 flocculation treatment is entered acidification pond, enriching H
2sO
4adjust pH value of solution to be about 3, staticly settle;
S340, the supernatant liquor after leaving standstill adopted reverse-flowly enter in water head tank through above-mentioned steps S330 acidification, namely intake bottom pillar, top water outlet, and regulate water inlet flow velocity to be 5mL/min, open air compressor simultaneously, adjust desired flow, make iron carbon filler in post be in fluidisation shape;
S350, the top water outlet after crossing post process through above-mentioned steps S240 is entered neutralization precipitation pond, adjust solution ph to be 8-9 with 5% milk of lime, staticly settle;
S360, the supernatant liquor after leaving standstill is entered flocculation basin carry out secondary flocculation treatment through the process of above-mentioned steps S350 neutralization precipitation, add flocculation agent FeCl by 2g/L
3, staticly settle; Supernatant liquor after secondary flocculation treatment being left standstill enters acidification pond and carries out after-souring process, enriching H
2sO
4adjust pH value of solution to be about 3, staticly settle; Supernatant liquor employing after after-souring process being left standstill is reverse-flow to be entered in water head tank, and keep draining flow velocity to be 5mL/min, top water outlet enters neutralization precipitation pond and carries out Two-step neutralization precipitation process, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime; Supernatant liquor after Two-step neutralization precipitation process being left standstill enters flocculation basin and carries out three flocculation treatment, adds flocculation agent FeCl by 2g/L
3, staticly settle; Supernatant liquor after three flocculation treatment being left standstill enters acidification pond and carries out three acidification, enriching H
2sO
4adjust pH value of solution to be about 3, staticly settle; Supernatant liquor employing after three acidification being left standstill is reverse-flow to be entered in water head tank, and keep water inlet flow velocity to be 5mL/min, top water outlet enters neutralization precipitation pond and carries out three neutralization precipitation process, adjusts solution ph to be 8-9, staticly settle with 5% milk of lime;
S370, above-mentioned steps S260 tri-neutralization precipitation process are left standstill after supernatant liquor enter sand filters process, control filtering velocity 7m/h, water outlet COD drops to 54mg/L by 241mg/L, and SS drops to 25mg/L by 162mg/L, and colourity is close to colourless.
Present invention process flow process is simple, and technique required equipment is simple, easy to operate, effective, instant effect, medicine used and reagent cheap and easy to get, the expense of plant running is low, has very high practicability.
Claims (8)
1. for a method for advanced treatment on coking wastewater, it is characterized in that, comprise the following steps:
(1) post is filled
Namely first soak waste iron filing with diluted acid and dilute alkaline soln respectively, more fully wash iron filings with clear water, meanwhile, pulverized by coke, get the coke crushed, the volume ratio being 10-13:1 in iron filings and coke ratio mixes rear loading iron carbon post;
(2) flocculation treatment
Be about to the coking chemical waste water after the process of above-mentioned steps (1) dress post, add concentration range and carry out flocculation postprecipitation at the flocculation agent of 2-3g/L;
(3) acidification
Be about to the supernatant liquor after above-mentioned steps (2) flocculation treatment precipitation, add concentrated acid and be modulated into the solution that pH value is 3, staticly settle;
(4) post process is crossed
Be about to supernatant liquor after above-mentioned steps (3) acidification leaves standstill adopt and reverse-flowly first enter water head tank, then waste water is made to enter from the bottom of iron carbon post, top is flowed out, controlling water inlet flow velocity is 3-5mL/min, and air compressor is opened while waste water enters, adjustment flow, makes the iron carbon filler in iron carbon post be in fluidized state;
(5) neutralizing treatment
Be about to cross the top water outlet after post process through above-mentioned steps (4), be modulated into the solution of pH value range between 8-9 with the milk of lime that concentration is 4-5%, and postprecipitation;
(6) be the operation that supernatant liquor after above-mentioned steps (5) neutralizing treatment being precipitated repeats in above-mentioned steps (2)-(5);
(7) sand filtration process
The waste water processed by above-mentioned steps (6) imports sand-bed filter, and control filtering velocity 6-8m/h, to retain more tiny throw out, water outlet COD can be down to 50-60mg/L, and SS can be down to 20-30mg/L, colourity close to colourless, to reach emission standard.
2. as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: that in described step (1), dilute acid soln adopts is rare H
2sO
4solution, the dilute NaOH solution that dilute alkaline soln adopts.
3. as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: be coke is ground into the granularity of granularity near iron filings in described step (1), get the coke crushed, the volume ratio being 12:1 in iron filings and coke ratio mixes rear loading iron carbon post.
4. as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: be adopt FeCl in described step (2)
3as flocculation agent;
Described step (2) flocculation treatment is by adding flocculation agent FeCl
3after, positive 3 valency Fe ions are at dissociation in water, and its hydrolysate has cohesion and flocculation two kinds of effects concurrently; Positive 3 valency Fe ions also hydrolyzable generate Fe (OH)
3colloid, to adsorb the suspended particle in waste water, makes the granulated in dispersion state reticulate structure, becomes more thick flocs unit and precipitate.
5. as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: that the concentrated acid in described step (3) adopts is dense H
2sO
4;
Described step (3) acidification is changed at the solubleness of phenols, ammonia nitrogen substances, impels it to separate out; Meanwhile, sulfide also can react and generate corresponding gas and precipitation.
6., as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: comprise a microelectrolysis processing waste water process in described step (4), specifically comprise electrochemical reaction, redox reaction and electro-coagulation.
7. as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: be adopt concentration to be the milk of lime of 5% in described step (5).
8., as claimed in claim 1 for the method for advanced treatment on coking wastewater, it is characterized in that: be utilize quartz sand filter media to retain more tiny throw out in described step (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510324582.3A CN104891721A (en) | 2015-06-12 | 2015-06-12 | Method for advanced treatment of coking wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510324582.3A CN104891721A (en) | 2015-06-12 | 2015-06-12 | Method for advanced treatment of coking wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104891721A true CN104891721A (en) | 2015-09-09 |
Family
ID=54024758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510324582.3A Pending CN104891721A (en) | 2015-06-12 | 2015-06-12 | Method for advanced treatment of coking wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104891721A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565563A (en) * | 2015-11-16 | 2016-05-11 | 河南豫冠化工科技开发有限公司 | Advanced treatment system for chemical wastewater |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004074087A (en) * | 2002-08-21 | 2004-03-11 | Mitsubishi Gas Chem Co Inc | Treatment method for cyanogen compound-containing waste liquid |
| CN102139979A (en) * | 2011-05-05 | 2011-08-03 | 中国科学院生态环境研究中心 | Method for treating coking waste water by electro-Fenton-coagulation combination process |
| CN102161543A (en) * | 2010-07-27 | 2011-08-24 | 王兵 | Advanced treatment method for well drilling wastewater based on compound catalytic oxidation of ozone |
| CN102464415A (en) * | 2010-10-29 | 2012-05-23 | 新奥科技发展有限公司 | Advanced treatment process for coal gasification wastewater |
| CN102627367A (en) * | 2012-04-24 | 2012-08-08 | 东北石油大学 | Method for advanced treatment of coking wastewater |
| CN203960001U (en) * | 2014-06-12 | 2014-11-26 | 河南众英环保工程有限责任公司 | A kind of high ammonia nitrogen coking wastewater processing system |
-
2015
- 2015-06-12 CN CN201510324582.3A patent/CN104891721A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004074087A (en) * | 2002-08-21 | 2004-03-11 | Mitsubishi Gas Chem Co Inc | Treatment method for cyanogen compound-containing waste liquid |
| CN102161543A (en) * | 2010-07-27 | 2011-08-24 | 王兵 | Advanced treatment method for well drilling wastewater based on compound catalytic oxidation of ozone |
| CN102464415A (en) * | 2010-10-29 | 2012-05-23 | 新奥科技发展有限公司 | Advanced treatment process for coal gasification wastewater |
| CN102139979A (en) * | 2011-05-05 | 2011-08-03 | 中国科学院生态环境研究中心 | Method for treating coking waste water by electro-Fenton-coagulation combination process |
| CN102627367A (en) * | 2012-04-24 | 2012-08-08 | 东北石油大学 | Method for advanced treatment of coking wastewater |
| CN203960001U (en) * | 2014-06-12 | 2014-11-26 | 河南众英环保工程有限责任公司 | A kind of high ammonia nitrogen coking wastewater processing system |
Non-Patent Citations (1)
| Title |
|---|
| 王海玥: "混凝/铁炭内电解处理焦化废水的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑（月刊）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565563A (en) * | 2015-11-16 | 2016-05-11 | 河南豫冠化工科技开发有限公司 | Advanced treatment system for chemical wastewater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100494098C (en) | Fenton and air-float integral water treating method | |
| CN101817575B (en) | Electric flocculation method and device for recovering and processing desulfurized wastewater | |
| CN102701496A (en) | Method and process for treating high-concentration organic wastewater difficult to degrade | |
| WO2010133151A1 (en) | Organic wastewater recycling treatment method | |
| CN102161543A (en) | Advanced treatment method for well drilling wastewater based on compound catalytic oxidation of ozone | |
| CN101993162A (en) | Method for treating reverse osmosis concentrated water | |
| CN102659281B (en) | Treatment method of liquor production wastewater | |
| CN103641230B (en) | Method for carrying out organic wastewater pretreatment by using an iron-carbon-Fenton-integrated reactor | |
| CN111606464A (en) | High COD phenol-containing sewage treatment method | |
| CN102442748B (en) | Deep treatment method of naphthenic acid wastewater | |
| CN107540135A (en) | A kind of safe and efficient percolate nanofiltration concentrate processing group technology | |
| CN210176671U (en) | High-salt high-concentration degradation-resistant organic wastewater treatment equipment | |
| CN110862182A (en) | Landfill leachate treatment device and method | |
| CN102627367A (en) | Method for advanced treatment of coking wastewater | |
| CN205099523U (en) | Heavy metal wastewater handles and recovery system | |
| CN112939352A (en) | Treatment method of comprehensive sewage of industrial park | |
| CN105110515B (en) | A kind of processing method of DSD acid waste water | |
| CN101671068B (en) | Method for iron internal electrolysis treatment of hard-degradation organic wastewater strengthened by magnetic catalyst and used fillings thereof | |
| CN104891721A (en) | Method for advanced treatment of coking wastewater | |
| CN105174567A (en) | Heavy metal wastewater treatment and recovery system and method | |
| CN101973661B (en) | Treatment method of processing wastewater of Chinese galls | |
| CN108395015A (en) | A kind of processing method of plating copper-containing wastewater | |
| CN211999245U (en) | Arsenic-containing organic wastewater treatment system | |
| CN105347580B (en) | A kind of method of suitable polymer flooding water processing standard discharge | |
| CN210764765U (en) | Novel wastewater treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |