CN105060628A - Semi-coke wastewater treatment method - Google Patents
Semi-coke wastewater treatment method Download PDFInfo
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- CN105060628A CN105060628A CN201510469604.5A CN201510469604A CN105060628A CN 105060628 A CN105060628 A CN 105060628A CN 201510469604 A CN201510469604 A CN 201510469604A CN 105060628 A CN105060628 A CN 105060628A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- 239000000571 coke Substances 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000002351 wastewater Substances 0.000 claims abstract description 94
- 238000000034 method Methods 0.000 claims abstract description 55
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 32
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005345 coagulation Methods 0.000 claims abstract description 13
- 230000015271 coagulation Effects 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 238000005273 aeration Methods 0.000 claims abstract description 5
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- 230000007062 hydrolysis Effects 0.000 claims description 30
- 238000006460 hydrolysis reaction Methods 0.000 claims description 30
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- 238000010992 reflux Methods 0.000 claims description 4
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical group CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000006396 nitration reaction Methods 0.000 description 7
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- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
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- 238000012545 processing Methods 0.000 description 3
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- FYGHSUNMUKGBRK-UHFFFAOYSA-N 1,2,3-trimethylbenzene Chemical compound CC1=CC=CC(C)=C1C FYGHSUNMUKGBRK-UHFFFAOYSA-N 0.000 description 2
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical compound O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
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- 239000003245 coal Substances 0.000 description 2
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- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
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- 239000000243 solution Substances 0.000 description 2
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- TZRXHJWUDPFEEY-UHFFFAOYSA-N Pentaerythritol Tetranitrate Chemical class [O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O TZRXHJWUDPFEEY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002053 acidogenic effect Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
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- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
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- 235000019253 formic acid Nutrition 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009439 industrial construction Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
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- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 description 1
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Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a semi-coke wastewater treatment method. A pretreatment process comprises the following steps: production wastewater goes through an oil separation sedimentation tank and undergoes oil-water separation, and obtained wastewater enters an equalization pool; the production wastewater in the equalization pool is pumped to a coagulation and air floatation machine and undergoes air floatation separation, and obtained production wastewater enters a first intermediate water pool; and production wastewater in the first intermediate water pool is pumped to a filtering system and is filtered, the obtained filtrate enters a phenol extraction system, and phenol extraction removed wastewater is pumped into an ammonia stripping tower in order to remove most free ammonia. A biochemical treatment process comprises the following steps: production wastewater obtained after removal of most of ammonia nitrogen through the ammonia stripping tower goes through a comprehensive equalization pool, obtained wastewater enters a hydrolysis-acidification pool, and wastewater from the hydrolysis-acidification pool enters an HABR compound anaerobic baffled reactor; and obtained wastewater enters an A/O treatment system, powdered active carbon is added to an aerobic tank in the A/O treatment system, wastewater discharged from the A/O treatment system enters a sedimentation tank, wastewater from the sedimentation tank goes through a third intermediate water pool, wastewater from the third intermediate water pool goes through an aeration bio-filter, and water discharged from the aeration bio-filter, reaching discharge standards, is discharged. The system has the advantages of simplicity, low cost and standard reaching discharge realization.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly a kind for the treatment of process of blue charcoal waste water.
Background technology
According to the difference of coking industry investment and production mode, the metallurgical coke that coking chemical waste water is divided into pollution lighter and coke waste water and with serious pollution semicoke and blue charcoal waste water two kinds.
Blue charcoal waste water is the waste water produced in coal semicoke product and quenching process, main containing coal tar oily substance, if any the coal tar oily substance that methyl alcohol, ethanol, formic acid, acetic acid, benzene,toluene,xylene, trimethylbenzene, phenol type substances, naphthalene, anthracene, quinone etc. are main, also containing a large amount of loop chain organic compound, nitrine class inorganic chemical and ammonia nitrogen etc.Because blue charcoal belongs to semicoke product, its waste water quality composition is similar to coke waste water.In coke production, pyrolysis temperature is about 1000 DEG C, and pyrolysis temperature relatively low (about 650 DEG C) in the production of blue charcoal.Therefore containing a large amount of not by the pollutent of high temperature oxidation in blue charcoal factory effluent, its concentration exceeds about 10 times than coke waste water, and the concentration of ammonia nitrogen, phenols is also far above coke waste water, but prussiate and thiocyanide concentration are lower than coke waste water.
Blue charcoal Wastewater Pollutant is of a great variety, complicated component, wherein COD, NH
3the concentration of-N, phenol and ammonia is higher, and organic composition is complicated, and most exist with the form of polycyclic aromatic hydrocarbons, aromatic series and heterogeneous ring compound, and containing a considerable amount of hazardous and noxious substances, biodegradability is poor, and NH in this waste water
3-N, TN (total nitrogen) are higher, and some of them nitrogen-containing heterocycle compound has toxicity, mutagenicity and carinogenicity to human body and animal.
Principal feature has:
1) oil-contg is high: in blue charcoal factory effluent, oil-contg is high, sometimes up to 2500mg/L, is dissolved with a large amount of pollutent in oil.
2) phenol content height Phenol for Waste Water content is up to 2660mg/L.Because the biodegradability of phenol is poor, and there is larger recovery value, therefore, first should carry out phenol extraction.
3) ammonia-nitrogen content is high
In blue charcoal factory effluent, ammonia content is high, sometimes up to 3000mg/L.The ammonia of high density is not only difficult to remove with biochemical process, and it has certain toxic action to biochemical treatment effect microorganism, can kill active sludge time serious, destroys whole biological treatment system.
4) hardly degraded organic substance content is high
Containing a large amount of benzene series, naphthalene system and heterocyclic hardly degraded organic substance in blue charcoal factory effluent, it is up to standard that common aerobic activated sludge process is difficult to directly process.
Just because blue charcoal waste water contains above feature, certainly directly can not discharge, therefore search out an applicable industrial construction, effective method of wastewater treatment becoming at present our problem in urgent need to solve.
Summary of the invention
For existing problem, the object of the present invention is to provide a kind for the treatment of process that can ensure the effective blue charcoal waste water of engineering construction, after treatment can qualified discharge.
To achieve these goals, technical scheme of the present invention is: a kind of blue charcoal method of wastewater treatment, comprises pretreatment stage and biochemical treatment stage, it is characterized in that: wherein pretreatment stage comprises:
Factory effluent carries out oily water separation through oil partiting precipitation pool, then enters the equilibrium that equalizing tank carries out water quality and quantity; Factory effluent in equalizing tank is extracted into coagulation air-float machine through lift pump, adds emulsion splitter, flocculation agent and coagulating agent in coagulation air-float machine, and after dissolved air flotation, factory effluent enters the first intermediate pool;
Factory effluent in first intermediate pool is extracted into filtering system again and filters, the SS further in removing waste water and oily substance;
Filtrate after filtration enters phenol extraction system, and waste water after extracting and dephenolizing regulates pH10-12, removes most free ammonia with pumping in Ammonia blowing-out tower after being steam heated to 45-55 DEG C;
The described biochemical treatment stage comprises:
Remove the factory effluent after most ammonia-nitrogen through Ammonia blowing-out tower and enter hydrolysis acidification pool behind comprehensive adjustment pond, enter HABR composite anaerobic baffled reactor from hydrolysis acidification pool waste water out, utilize the anaerobic bacterium in anaerobic pond to degrade to the organism in waste water;
Then enter A/O treatment system, the Aerobic Pond in A/O treatment system adds Powdered Activated Carbon, and waste water out enters settling tank afterwards from A/O treatment system, then after the 3rd intermediate pool, BAF qualified discharge.
Factory effluent of the present invention refers to the waste water produced in the blue charcoal production process except quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water.After the method process, energy qualified discharge, current engineering has been built, and is in stable running status, and technical process is simple, and device is few, and construction cost is low, and working cost is low.
In such scheme: also comprise water collecting basin, quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water are collected water collecting basin, is then extracted into comprehensive adjustment pond and mixes with pretreated factory effluent.Quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water are collected separately, without pretreatment stage, directly enter the biochemical treatment stage, because the oil-contg of these waste water own is not high, phenol content is not high, biodegradability is good, directly mixes with factory effluent, reduces pre-treatment cost.
In such scheme: the waste water in equalizing tank before being extracted into coagulation air-float machine, first by being steam heated to 25-30 DEG C.Can significantly improve breakdown of emulsion, daf efficiency, and can not the steam energy of at substantial.Most of organism in waste water can be removed by oil removal precipitation, breakdown of emulsion air supporting, alleviate subsequent technique processing pressure.
In such scheme: pretreatment stage, in phenol extraction system, extraction agent is MIBK extraction agent, be 3:1-4:1 according to the throughput ratio of waste water and extraction agent, the extraction out of phenol extraction system enters phenol reextraction system, strip with alkali lye, the concentration of alkali lye is 10%-15%, and the throughput ratio of extraction agent and alkali lye is 2:1-3:1.In the dephenolize waste water of discharging, containing phenol amount≤200mg/L, clearance more than 90%.
In such scheme: the biochemical treatment stage, pulsed water distributor is set in the import of hydrolysis acidification pool.Pulse water distributing device is set at water-in, makes Inlet flow pattern all become pulse mode over time and space, while raising uniformity of water distribution, improve muddy water mixture strength.
In such scheme: arrange aerating apparatus in the bottom of hydrolysis acidification pool, gap aeration, keep dissolved oxygen in pond to be in double oxygen or non-critical anaerobic state, meanwhile, aerating apparatus plays stirring mud, strengthens the effect of muddy water mixing.
In such scheme: draw a return line at the water outlet of hydrolysis acidification pool and be connected with shore pipe, reflux pump is adopted water outlet to be back in hydrolysis acidification pool through shore pipe interval.Prevent deposition to stir mud, reduce reaction dead zone ratio.
In above-mentioned side's scheme: also draw at the water outlet of hydrolysis acidification pool and have another return line, this return line to the water inlet pipe of hydrolysis acidification pool for diluting the concentration of entering organic matter of water.
In such scheme: described A/O treatment system comprises anoxic pond, Aerobic Pond, and waste water first enters Aerobic Pond after anoxic pond, after finally entering settling tank precipitation, enter next link; Effluent part wherein in the partial sludge of settling tank and Aerobic Pond is back to anoxic pond again.By the mixed solution of Aerobic Pond and the sludge reflux of settling tank to anoxic pond, can when realizing anti-nitration reaction, organism in raw wastewater can be utilized directly as organic carbon source, become nitrogen by what return from Aerobic Pond containing the nitrate denitrification in the mixed solution of nitrate.The basicity produced due to anti-nitration reaction in denitrification reactor (anoxic pond) can enter aerobic nitrification reactor (Aerobic Pond) with water outlet, about compensating the half of required consumption basicity in nitration reaction process.Aerobic nitrator is arranged on the rear end of flow process, and organism usually residual in denitrification process also can be made to be able to further removal.
In such scheme: the amount adding Powdered Activated Carbon in Aerobic Pond is 50-100g/L.Add active carbon powder, improve the adsorption-flocculation performance of mud, thus improve the removal effect of COD.
The invention has the beneficial effects as follows: present invention process flow process is simple, construction cost is low, Technology is advanced, up to standard reliable, construction investment is reasonable, working cost is low, treated waste water finally can qualified discharge, improves the economic benefit of enterprise, environmental benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is present invention process schema;
Fig. 2 is the structural representation of hydrolysis acidification pool.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described:
Embodiment 1
Waste water handled by the present invention is blue charcoal waste water, is the waste water produced in coal semicoke product and quenching process.Waste water in production process except quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water is called factory effluent by the present invention, do not comprise sanitary wastewater, factory effluent, first after pre-treatment, mixes with quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water in comprehensive adjustment pond.
Emission standard:
According to the technical requirements of this project bid file, blue charcoal factory effluent performs " coking chemistry emission of industrial pollutants standard " (GB16171-2012), and institute's effluent master control water-quality guideline and emission concentration limit value should meet the requirement of table 1:
Table 1 sewage works water outlet master control water-quality guideline and concentration limit table look-up thereof
Waste water quality situation is in table 2:
Table 2
Whole treatment system comprises pretreatment stage and biochemical treatment stage
As shown in Figure 1: pretreatment stage comprises the oil partiting precipitation pool 1, equalizing tank 2, coagulation air-float machine 3, first intermediate pool 4, filtering system 5, phenol extraction system 6, phenol reextraction system 7, second intermediate pool 8, the Ammonia blowing-out tower 9 that connect successively.
The biochemical treatment stage comprises for collecting quenching waste water, coal-fired pipeline water of condensation, the water collecting basin 10 of gas liquor water shutoff and laboratory assay water, comprehensive adjustment pond 11, hydrolysis acidification pool 12, HABR composite anaerobic baffled reactor 13, anoxic pond 14, Aerobic Pond 15, settling tank 16, the 3rd intermediate pool 18, BAF 19 and clean water basin 20, the water qualified discharge of clean water basin 20.
Concrete treatment process process is:
1, oil removal precipitation
Factory effluent enters oil partiting precipitation pool 1.
Containing a large amount of oily substance in factory effluent, dissolve a large amount of organic pollutant in oil, by the removal to tar-like substance, also can remove some organic pollutants, and then reduce the operating load of follow-up workshop section.
Oils in factory effluent can be divided into oil slick, dispersed oil, oil in water emulsion and dissolving oil 4 kinds:
(1) oil slick, its warp is generally greater than 100 μm, floats on the water surface with the form of external phase, forms oil film or oil reservoir.
(2) dispersed oil, with small oil droplet suspension in water, unstable, usually become oil slick after leaving standstill for some time, the grain of oil droplet is through generally between 10 ~ 100 μm.
(3) oil in water emulsion, when in waste water containing certain tensio-active agent time or oil-water mixture after the impeller pump high speed rotating that rotating speed is about 3000r/min, oil droplet just becomes stable emulsion and is scattered in water, oil droplet grain is through minimum, be generally less than 10 μm, most between 0.1 ~ 2 μm, simple more difficult with the method for leaving standstill separation.
(4) dissolving oil, the microparticulate of dissolving with a kind of chemical mode oil, elaioleucite diameter is generally less than 0.1 μm.
First blue charcoal factory effluent enters oil partiting precipitation pool 1, carries out oily water separation wherein.The heavy oil separated is deposited in the oil bucket of bottom, is promoted to heavy oil storage tank stores by oil pump; Oil slick, dispersion on oil floats on water, are scraped to oil slick groove from flowing to the storage of light oil storage tank through Oil scraper.
After oil removal precipitation process, also containing a certain amount of oil slick, dispersed oil in waste water, removed by air-flotation system effect.
2 coagulation air-floats
From oil partiting precipitation pool 1, waste water out enters equalizing tank 2, is then extracted into coagulation air-float machine 3 with pump.
Entering between coagulation air-float machine 3, adopting plant area's steam waste water to be heated to 25-30 DEG C, the oil in water emulsion in waste water, colloidal type pollutent, adopting dosing air-dissolving air-float to be removed.Before dosing (coagulating agent and flocculation agent) air supporting, emulsion splitter (iron trichloride, add-on is 1-2g/L waste water) is adopted to make oil in water emulsion structure deteriorate, to reach in oil in water emulsion the object come that is respectively separated.
Adding coagulating agent is more wherein PAC, and flocculation agent is PAM, and the add-on of described PAC is 0.8-1.5g/L waste water, and the add-on of described PAM is 10 ~ 50mg/L.
Most of organism in waste water can be removed by oil removal precipitation, breakdown of emulsion, air supporting, alleviate subsequent technique processing pressure.
After coagulation air-float, enter the first intermediate pool 4, then go filtering system 5 to filter, removing residue.The backwashing water of filtering system 5 enters equalizing tank 2, and backwashing water is from clean water basin 20.Coagulation air-float machine residue out enters materialized mud pond 21, classification process after mud spiral pump 22, chamber filter press 23 press filtration.
3 phenol extractions
Filtering system 5 filtrate out enters phenol extraction system 6, and extraction agent is MIBK extraction agent, is that 3:1-4:1 extracts according to the throughput ratio of waste water and extraction agent.
Extraction agent after extraction enters phenol reextraction system 7, and carry out reextraction with alkali lye and obtain sodium phenolate, the extraction agent after reextraction enters phenol extraction system 6 again and extracts.Alkali lye is sodium carbonate solution or sodium hydroxide solution, and the concentration of alkali lye is 10%-15%, and the throughput ratio of extraction agent and alkali lye is 2:1-3:1.
By phenol content≤200mg/L after this extraction step, the waste water after extraction enters the second intermediate pool 8.
4, denitrogenation
In factory effluent, ammonia nitrogen up to 3000mg/L, can adopt biological denitrificaion intractability very large, enters biochemical system again and carry out biological denitrificaion after needing first pre-treatment to remove most ammonia-nitrogen completely.
This programme selects cost-effective blow-off method, and reclaim(ed) sulfuric acid ammonium also can produce certain economic value, offset operation cost.
Waste water enters Ammonia blowing-out tower 9, and the equipment that Ammonia blowing-out tower 9 removal of ammonia and nitrogen adopts is generally and fills Packed stripping tower and centrifugal blower.Ammonia blowing-out tower adopts circular packing tower structure, and tower top is waste water water distribution area, and middle part is packing area, and bottom is air flow method district and catchment area.Centrifugal blower blasts air from tower bottom, pH value is adjusted to 10-12, temperature be 45-55 DEG C (steam need be adopted to heat) waste water from tower top evenly spray and, waste water on the surface of filler carefully thin, uniform liquid film contact with air is reverse, under the effect of air, with NH
3the ammonia that free molecule form exists volatilizees from water, thus by ammonia nitrogen removal.Stripping gas containing ammonia adopts dilute sulphuric acid washing and recycling in recovery tower, generates ammonium sulfate, can make Agricultural Fertilizer and use.
5, acidication,
Quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water enter water collecting basin 10.
Waste water after denitrogenation enters comprehensive adjustment pond 11 and mixes with the waste water from water collecting basin 10.Then hydrolysis acidification pool 12 is pumped into.
Organism in blue charcoal waste water (comprising factory effluent, quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water) is divided into biodegradable and not biodegradable two classes.In biodegradable organic, have again readily biodegradable and difficult for biological degradation point.The poor major cause of blue charcoal wastewater biodegradability is that biological degradation at a slow speed and refractory organic proportion are higher.General Aerobic biological process to hardly degraded organic substance and chroma removal rate not high, this is because some complicated polymer substance under simple aerobic condition molecular structure be difficult to destroy, the biological degradation transformation period is very long.The Main Function of anaerobic biological treatment makes the hardly degraded organic substance in blue charcoal factory effluent and some chromophoric group disintegrate, be substituted or cracking (degraded), thus reduce the colourity of waste water, improves biodegradability.To some chromonic material, even if directly colourity can not be reduced, but change due to molecular structure or chromophoric group, it also can be made easily to be degraded under aerobic condition and to decolour.
Anaerobic treatment process has to pass through four-stage completely: hydrolysis stage, souring stage, acid decline stage, methanation stage.Acidication need complete anaerobic treatment the first two stage, and complete anaerobism has then needed anaerobic treatment whole stage.
Hydrolysis Acidification is under the environment of double oxygen or non-critical anaerobism, completes hydrolysis and acidifying two processes, by effects such as the hydrolysis of microorganism and acidogenic fermentations, the larger molecular organics of complexity is transferred to the process of the products such as simple organic.Make the Substance Transformation of some bio-refractories in waste water be easy degradation product by this process, be beneficial to follow-up biochemical treatment.In chemical industry, pharmaceutical industry waste water treatment technique, more adopt Hydrolysis Acidification as the pre-treatment of aerobic biochemical.
Acidication technique summary has the following advantages:
(1) product of hydrolysis, souring stage is mainly micromolecular organism, and biodegradability is generally better.Because acidication obviously can change the biodegradability of raw wastewater, thus reaction times and the energy consumption of subsequent disposal can be reduced.
(2) be hydrolyzed, acidization can make solid organic matters liquefy, degraded, waste sludge amount can be reduced, its function and anaerobic digester similar.
(3) do not need airtight pond, reduce cost, be convenient to safeguard.
(4) due to reaction controlling at product hydrogen, produce acetic acid and before the methane phase stage, water outlet, without the unpleasant odor of anaerobically fermenting, can improve the environment of waste water processing station.
(5) acidication technology gains everything and lose nothing, and being apt to add utilization to be the sharp weapon of biochemical treatment.
The present invention improves traditional hydrolysis acidification pool, and concrete structure is:
The structure of hydrolysis acidification pool 12, as Fig. 2, comprises pond body 12-1, arranges aerating apparatus 12-2 in the bottom of pond body 12-1, gap aeration, keeps dissolved oxygen in pond to be in double oxygen or non-critical anaerobic state, simultaneously, aerating apparatus 12-2 plays stirring mud, strengthens the effect of muddy water mixing.
The bottom of pond body 12-1 is provided with water inlet pipe, the pulsed water distributor 12-3 be connected with water inlet pipe is provided with in the body 12-1 of pond, rushing formula water distributor 12-3 is positioned at below aerating apparatus 12-2, Inlet flow pattern is made all to become pulse mode over time and space, improve uniformity of water distribution, improve muddy water mixture strength simultaneously.
Water outlet 12-4 is arranged on body 12-1 top, pond, and water outlet 12-4 draws a return line 12-5 and is connected with shore pipe 12-6, and shore pipe 12-6 is positioned at the lower end of pond body 1.Reflux pump is adopted water outlet to be back in hydrolysis acidification pool through shore pipe 12-6 interval.
Water outlet 12-4 also draws another return line, and this return line 12-5 connects the water inlet pipe of hydrolysis acidification pool for diluting the concentration of entering organic matter of water.
6, anaerobic reaction
Waste water after acidication enters HABR composite anaerobic baffled reactor 13, carries out anaerobic reaction, completes methanation.The organic acid that acidication is produced is converted into methane and carbon dioxide immediately.
7, A/O system
A/O system comprises anoxic pond 14, Aerobic Pond 15, and waste water is successively through anoxic pond 14, Aerobic Pond 15, settling tank 16.The effluent part of Aerobic Pond 15 and the partial sludge of settling tank 16 are back to anoxic pond 14.Add Powdered Activated Carbon in Aerobic Pond 14, dosage is 50-100g/L waste water.
Denitrification reactor (anoxic pond) is arranged on the front end of flow process, and removes COD
cr, the comprehensive aerobic reactor (Aerobic Pond) that carries out nitration reaction is then arranged on the rear end of flow process, raw wastewater enters anoxic pond and Aerobic Pond and settling tank successively, the mixed solution of Aerobic Pond and the partial sludge of settling tank are back to anoxic pond simultaneously, therefore, can when realizing anti-nitration reaction, organism in raw wastewater can be utilized directly as organic carbon source, become nitrogen by what return from aerobic reactor containing the nitrate denitrification in the mixed solution of nitrate.The basicity produced due to anti-nitration reaction in denitrification reactor can enter aerobic nitrification reactor with water outlet, about compensating the half of required consumption basicity in nitration reaction process.Aerobic nitrator is arranged on the rear end of flow process, and organism usually residual in denitrification process also can be made to be able to further removal.
8, settling tank 16 waste water out enters the 3rd intermediate pool 18, BAF 19 (BAF pond) and clean water basin 20, the water qualified discharge of clean water basin 20.The mud in whole biochemical treatment stage enters biochemical sludge pond 17, classification process after mud spiral pump 21, chamber filter press 22 press filtration.Concrete enters biochemical sludge pond from hydrolysis acidification pool, HABR composite anaerobic baffled reactor, settling tank mud out.
Table 3 is each index clearance analytical table after each step process of the present invention
Table 3 (mg/l)
As can be seen from Table 3, the clearance of CODcr can reach 99.93%, and the clearance of ammonia nitrogen can reach 99.72%, volatile phenol can reach 99.99%, the clearance of SS can reach 95.28%, and the clearance of petroleum substance can reach 99.99%, and the clearance of sulfide can reach 98.06%.And investigate through serial sampling after a while, find that water outlet can stably reaching standard discharge.The method is effective treatment process to blue charcoal waste water.
The present invention is not limited to above-described embodiment, should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a blue charcoal method of wastewater treatment, comprises pretreatment stage and biochemical treatment stage, it is characterized in that: wherein pretreatment stage comprises:
Factory effluent carries out oily water separation through oil partiting precipitation pool, then enters the equilibrium that equalizing tank carries out water quality and quantity; Factory effluent in equalizing tank is extracted into coagulation air-float machine through lift pump, adds emulsion splitter, flocculation agent and coagulating agent in coagulation air-float machine, and after dissolved air flotation, factory effluent enters the first intermediate pool;
Factory effluent in first intermediate pool is extracted into filtering system again and filters, the SS further in removing waste water and oily substance;
Filtrate after filtration enters phenol extraction system, and waste water after extracting and dephenolizing regulates pH10-12, removes most free ammonia with pumping in Ammonia blowing-out tower after being steam heated to 45-55 DEG C;
The described biochemical treatment stage comprises:
Remove the factory effluent after most ammonia-nitrogen through Ammonia blowing-out tower and enter hydrolysis acidification pool behind comprehensive adjustment pond, enter HABR composite anaerobic baffled reactor from hydrolysis acidification pool waste water out, utilize the anaerobic bacterium in anaerobic pond to degrade to the organism in waste water;
Then enter A/O treatment system, the Aerobic Pond in A/O treatment system adds Powdered Activated Carbon, and waste water out enters settling tank afterwards from A/O treatment system, then after the 3rd intermediate pool, BAF qualified discharge.
2. blue charcoal method of wastewater treatment according to claim 1, is characterized in that:
Also comprise water collecting basin, quenching waste water, coal-fired pipeline water of condensation, gas liquor water shutoff and laboratory assay water are collected water collecting basin, is then extracted into comprehensive adjustment pond and mixes with pretreated factory effluent.
3. blue charcoal method of wastewater treatment according to claim 1 or 2, is characterized in that: the waste water in equalizing tank before being extracted into coagulation air-float machine, first by being steam heated to 25-30 DEG C.
4. blue charcoal method of wastewater treatment according to claim 3, it is characterized in that: pretreatment stage, in phenol extraction system, extraction agent is MIBK extraction agent, be 3:1-4:1 according to the throughput ratio of waste water and extraction agent, the extraction out of phenol extraction system enters phenol reextraction system, strips with alkali lye, the concentration of alkali lye is 10%-15%, and the throughput ratio of extraction agent and alkali lye is 2:1-3:1.
5. blue charcoal method of wastewater treatment according to claim 4, is characterized in that: the biochemical treatment stage, arranges pulsed water distributor at the water-in of hydrolysis acidification pool.
6. blue charcoal method of wastewater treatment according to claim 5, is characterized in that: arrange aerating apparatus in the bottom of hydrolysis acidification pool, gap aeration, dissolved oxygen in pond is kept to be in double oxygen or non-critical anaerobic state, meanwhile, aerating apparatus plays stirring mud, strengthens the effect of muddy water mixing.
7. blue charcoal method of wastewater treatment according to claim 6, is characterized in that: draw a return line at the water outlet of hydrolysis acidification pool and be connected with shore pipe, adopts reflux pump water outlet to be back in hydrolysis acidification pool through shore pipe interval.
8. blue charcoal method of wastewater treatment according to claim 7, is characterized in that: also drawing at the water outlet of hydrolysis acidification pool has another return line, and this return line connects the water inlet pipe of hydrolysis acidification pool for diluting the concentration of entering organic matter of water.
9. blue charcoal method of wastewater treatment according to claim 8, is characterized in that: described A/O treatment system comprises anoxic pond, Aerobic Pond, and waste water first enters Aerobic Pond after anoxic pond, enters next link after finally entering settling tank precipitation; Effluent part wherein in the partial sludge of settling tank and Aerobic Pond is back to anoxic pond again.
10. blue charcoal method of wastewater treatment according to claim 9, is characterized in that: the amount adding Powdered Activated Carbon in Aerobic Pond is 50-100g/L.
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