CN109336293A - The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) - Google Patents
The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) Download PDFInfo
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- CN109336293A CN109336293A CN201811400290.3A CN201811400290A CN109336293A CN 109336293 A CN109336293 A CN 109336293A CN 201811400290 A CN201811400290 A CN 201811400290A CN 109336293 A CN109336293 A CN 109336293A
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of removal techniques of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF), the present invention is to obtain the waste water for meeting sewage treatment plant's standard by the way that SS removal, water quality and water homogenizing, formaldehyde remove, calcium ion removes, SS is removed again in displacement waste water and Treatment of Sludge step removal displacement formaldehyde in waste water；The formaldehyde removal targeting of present invention process method is strong, and removal efficiency is high, and up to 99.8% or more, and the lime method reaction time is short, operating cost is low.
Description
Technical field
The invention belongs to formaldehyde in waste water removal technology fields, and in particular to a kind of dry tail gas spray of medium density fibre board (MDF)
The removal technique of dedusting displacement formaldehyde in waste water.
Background technique
To adapt to the stringenter wood-based panel industry atmosphere pollutants emission standards of country, the production of various regions medium density fibre board (MDF)
Enterprise is both needed to carry out upgrading on the basis of existing dry tail gas cyclone dust removal, and the upgrading technique of mainstream is adopted at present
It should to ensure that the substances such as salinity, formaldehyde will not be accumulated in circulated sprinkling water with circulated sprinkling dedusting+wet static dedusting technology
Technology needs periodically to replace part circulated sprinkling water, and displacement waste water has the following characteristics that coolant-temperature gage is high (at 50 DEG C or so)；
Organic concentration height (COD is in 10000mg/L or so)；Biodegradability is poor (B/C is below 0.3)；Coloration is high, and (coloration is at 5000 times
Left and right)；The features such as concentration of formaldehyde height (formaldehyde is in 1000mg/L or so).High-concentration formaldehyde wastewater is a kind of typical difficult biochemical drop
The toxicity organic wastewater of solution, formaldehyde therein can directly be reacted with the intracorporal protein of microorganism, DNA, RNA, to inhibit it
Bioactivity, even results in microorganism death, and general biochemical processing process is difficult to adapt to.
The treatment process of the formaldehyde waste water of high concentration, is mainly the following method at present:
First is that oxidizing process.In oxidizing process, what is the most commonly used is by H2O2And Fe2+The Fenton reagent of composition, PARA FORMALDEHYDE PRILLS(91,95) waste water
Oxidation processes are carried out, CO is oxidized the formaldehyde into2And H2O so that realize the drop to organic matters such as formaldehyde in waste water in a short time
Solution.The chemical agent that oxidizing process uses is more, and operating cost is high and oxidizing process is not high to the removal targeting of formaldehyde in waste water, goes
Except efficiency be easy to be influenced by other low molecule organic matters it is not high to the removal efficiency of the organic wastewater containing formaldehyde of complicated component.
Second is that biological treatment.Biological treatment is a kind of pollution processing that index low in cost, recyclable, environmentally friendly is high
Method.But since formaldehyde waste water has stronger inhibition or even destructiveness for microorganism, only not by biology itself
The processing work of formaldehyde waste water can be competent at.In concrete practice, usually by the degradation function of anaerobic hydrolysis-acidification combination aerobe,
It is jointly processed by formaldehyde waste water.Simultaneously, it is necessary to process range be limited to the formaldehyde waste water of low concentration, otherwise the formaldehyde in waste water
It will inhibit even to kill aerobe in advance.It in general, is handled by other methods elder generation PARA FORMALDEHYDE PRILLS(91,95) waste water, when
When concentration is reduced to safety index, then it is aided with biological treatment, to reach optimal formaldehyde waste water processing effect.
Third is that blow-off method.Blow-off method handles the principle of formaldehyde waste water, is for formaldehyde low boiling point, volatile and soluble easily in water
Chemical characteristic, by the Formaldehyde Gasification in formaldehyde waste water, and can be by the formaldehyde gas recycling and reusing of generation.This method,
Primarily directed to the higher formaldehyde waste water of concentration, certain recycle can be played the role of.However, this method has quite
Big limitation.First is that being unable to the lower formaldehyde waste water of concentration for the treatment of, and after formaldehyde waste water higher for concentration processing simultaneously
Decontamination cannot really be played the role of, it is still desirable to which other methods carry out advanced treating to waste water；Second is that it is low in economic efficiency, it blows
The energy consumption of de- method is larger, and can similarly be recycled to high-concentration formaldehyde wastewater by other separating technologies, in contrast
Blow-off method does not simultaneously have economic and practical.
Summary of the invention
The present invention is directed to prior art problem, provides in a kind of dry tail gas spraying and dedusting displacement waste water of medium density fibre board (MDF)
The formaldehyde removal targeting of the removal technique of formaldehyde, present invention process method is strong, and removal efficiency is high, and up to 99.8% or more, and
The lime method reaction time is short, and operating cost is low.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF), the technique includes following
Step:
(1) it replaces SS removal in waste water: displacement waste water being pumped into flotation tank by water pump and be added flocculating agent A, removes waste water
In SS；
(2) water quality and water homogenizing: flotation tank water outlet gravity flow enters the homogenizing that conditioning tank carries out water quality and water；
(3) formaldehyde removes: the waste water in conditioning tank being continuously pumped into the first formaldehyde resin reactor by water pump, then presses formaldehyde
It is that lime mixing is added in 2:1, and adjusting pH value is 12, is warming up to 70-75 DEG C, carries out preliminary with lime quality concentration ratio
Resinification reaction；Then gravity flow enters the second formaldehyde resin reactor, is warming up to 80-85 DEG C, under stirring, first again
Aldehyde continues that polymerization reaction generation hexose occurs；
(4) calcium ion removes: the water outlet of the second formaldehyde resin reactor removes reactor from calcium ion is flowed into, and sodium carbonate is added,
It is thoroughly mixed, then separates sludge with waste water, wherein sodium carbonate amount is consistent with amount of lime；
(5) SS is removed again: calcium ion removes reactor water outlet and removes reactor from SS is flowed into, and first adjusts pH value of waste water with sulfuric acid
It to neutrality, then adds suitable aluminium polychloride and anionic polyacrylamide and is stirred, remove and reacted in waste water
The suspended impurity of generation, water outlet obtain the waste water for meeting sewage plant influent quality requirement；
(6) Treatment of Sludge: the sludge that above-mentioned flotation tank, calcium ion removal reactor and SS removal reactor generate is discharged into sludge
Pond is transported outward after being dehydrated by sludge dewatering equipment desiccation, and the filtrate of generation, which is back in conditioning tank, to be continued with.
Further, flocculating agent A is cationic polyacrylamide, dosage 30-50mg/L in step (1).
Further, homogenizing is completed by air stirring in step (2), and stirring air dosage is 1-2m3/ (m2H).
Further, the first formaldehyde resin reactor and the second formaldehyde resin reactor series operation in step (3),
Its heating mode is steam direct heating.
Further, the first formaldehyde resin reactor and when the second formaldehyde resin reactor overall reaction in step (3)
Between be 3h.
The present invention has the advantages that formaldehyde resin reactor is using two sets of continuous series fortune in present invention process method
Row, compared with conventional intermittent duty, reactor volume is small, low cost and heat loss is few, and steam demand amount is small, operating cost
Low, removal formaldehyde is more efficient；Meanwhile formaldehyde resin reactor heating mode uses steam direct heating mode, with other
Heating method is compared, and the thermal efficiency is high, and steam demand amount is small, further decreases operating cost and cost；In addition, the present invention is logical
The mating calcium ion removal reactor of formaldehyde resin reactor is crossed, Ca remaining in waste water is removed2+, avoid remaining in waste water
Ca2+The harm such as fouling blockage is generated to follow-up equipment；Formaldehyde removal targeting of the invention is strong, and removal efficiency is high, up to
99.8% or more.
Detailed description of the invention
Fig. 1 is formaldehyde removal device flow diagram in the embodiment of the present invention.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, the present invention will be further described for following instance, but
It is not used to limit the scope of the present invention.
Embodiment 1
A kind of removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF), the technique includes following
Step:
(1) it replaces SS removal in waste water: displacement waste water being pumped into flotation tank by water pump and be added flocculating agent A, dosage is
50mg/L removes the SS in waste water；
(2) water quality and water homogenizing: flotation tank water outlet gravity flow enter conditioning tank by air stirring progress water quality and water it is equal
Change, stirring air dosage is 2m3/ (m2H)；
(3) formaldehyde removes: the waste water in conditioning tank being continuously pumped into the first formaldehyde resin reactor by water pump, then presses formaldehyde
It is that lime mixing is added in 2:1, and adjusting pH value is 12, is heated up using steam direct heating mode with lime quality concentration ratio
To 70 DEG C, preliminary resinification reaction is carried out；Then gravity flow enters the second formaldehyde resin reactor, is warming up to 85 DEG C again,
Under stirring, formaldehyde continues that polymerization reaction generation hexose, the first formaldehyde resin reactor and the second formaldehyde resin occurs
Change reactor total reaction time is 3h；
(4) calcium ion removes: the water outlet of the second formaldehyde resin reactor removes reactor from calcium ion is flowed into, and sodium carbonate is added,
It is thoroughly mixed, then separates sludge with waste water；
(5) SS is removed again: calcium ion removes reactor water outlet and removes reactor from SS is flowed into, and first adjusts pH value of waste water with sulfuric acid
It to neutrality, then adds aluminium polychloride and anionic polyacrylamide and is stirred, remove what reaction in waste water generated
Suspended impurity, water outlet obtain the waste water for meeting sewage plant influent quality requirement；
(6) Treatment of Sludge: the sludge that above-mentioned flotation tank, calcium ion removal reactor and SS removal reactor generate is discharged into sludge
Pond is transported outward after being dehydrated by sludge dewatering equipment desiccation, and the filtrate of generation, which is back in conditioning tank, to be continued with.
Through detecting, the dry tail gas spraying and dedusting displacement formaldehyde in waste water original concentration of medium density fibre board (MDF) in 1500mg/L,
Concentration of formaldehyde is in 3.0mg/L after the present invention removes process.
Embodiment 2
A kind of removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF), the technique includes following
Step:
(1) it replaces SS removal in waste water: displacement waste water being pumped into flotation tank by water pump and be added flocculating agent A, dosage is
30mg/L removes the SS in waste water；
(2) water quality and water homogenizing: flotation tank water outlet gravity flow enter conditioning tank by air stirring progress water quality and water it is equal
Change, stirring air dosage is 1.5m3/ (m2H)；
(3) formaldehyde removes: the waste water in conditioning tank being continuously pumped into the first formaldehyde resin reactor by water pump, then presses formaldehyde
It is that lime mixing is added in 2:1, and adjusting pH value is 12, is heated up using steam direct heating mode with lime quality concentration ratio
To 75 DEG C, preliminary resinification reaction is carried out；Then gravity flow enters the second formaldehyde resin reactor, is warming up to 80 DEG C again,
Under stirring, formaldehyde continues that polymerization reaction generation hexose, the first formaldehyde resin reactor and the second formaldehyde resin occurs
Change reactor total reaction time is 3h；
(4) calcium ion removes: the water outlet of the second formaldehyde resin reactor removes reactor from calcium ion is flowed into, and sodium carbonate is added,
It is thoroughly mixed, then separates sludge with waste water；
(5) SS is removed again: calcium ion removes reactor water outlet and removes reactor from SS is flowed into, and first adjusts pH value of waste water with sulfuric acid
It to neutrality, then adds aluminium polychloride and anionic polyacrylamide and is stirred, remove what reaction in waste water generated
Suspended impurity, water outlet obtain the waste water for meeting sewage plant influent quality requirement；
(6) Treatment of Sludge: the sludge that above-mentioned flotation tank, calcium ion removal reactor and SS removal reactor generate is discharged into sludge
Pond is transported outward after being dehydrated by sludge dewatering equipment desiccation, and the filtrate of generation, which is back in conditioning tank, to be continued with.
Through detecting, the dry tail gas spraying and dedusting displacement formaldehyde in waste water original concentration of medium density fibre board (MDF) in 1500mg/L,
Concentration of formaldehyde is in 2.0mg/L after the present invention removes process.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (5)
1. a kind of removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF), it is characterised in that: institute
State technique the following steps are included:
(1) it replaces SS removal in waste water: displacement waste water being pumped into flotation tank by water pump and be added flocculating agent A, removes waste water
In SS；
(2) water quality and water homogenizing: flotation tank water outlet gravity flow enters the homogenizing that conditioning tank carries out water quality and water；
(3) formaldehyde removes: the waste water in conditioning tank being continuously pumped into the first formaldehyde resin reactor by water pump, then presses formaldehyde
It is that lime mixing is added in 2:1, and adjusting pH value is 12, is warming up to 70-75 DEG C, carries out preliminary with lime quality concentration ratio
Resinification reaction；Then gravity flow enters the second formaldehyde resin reactor, is warming up to 80-85 DEG C, under stirring, first again
Aldehyde continues that polymerization reaction generation hexose occurs；
(4) calcium ion removes: the water outlet of the second formaldehyde resin reactor removes reactor from calcium ion is flowed into, and sodium carbonate is added,
It is thoroughly mixed, then separates sludge with waste water；
(5) SS is removed again: calcium ion removes reactor water outlet and removes reactor from SS is flowed into, and first adjusts pH value of waste water with sulfuric acid
It to neutrality, then adds suitable aluminium polychloride and anionic polyacrylamide and is stirred, remove and reacted in waste water
The suspended impurity of generation, water outlet obtain the waste water for meeting sewage plant influent quality requirement；
(6) Treatment of Sludge: the sludge that above-mentioned flotation tank, calcium ion removal reactor and SS removal reactor generate is discharged into sludge
Pond is transported outward after being dehydrated by sludge dewatering equipment desiccation, and the filtrate of generation, which is back in conditioning tank, to be continued with.
2. a kind of removal of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) according to claim 1
Technique, it is characterised in that: flocculating agent A is cationic polyacrylamide, dosage 30-50mg/L in step (1).
3. a kind of removal of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) according to claim 1
Technique, it is characterised in that: homogenizing is completed by air stirring in step (2), and stirring air dosage is 1-2m3/ (m2H).
4. a kind of removal of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) according to claim 1
Technique, it is characterised in that: the first formaldehyde resin reactor and the second formaldehyde resin reactor series operation in step (3),
Its heating mode is steam direct heating.
5. a kind of removal of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) according to claim 1
Technique, it is characterised in that: the first formaldehyde resin reactor and the second formaldehyde resin reactor total reaction time in step (3)
For 3h.
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| CN201811400290.3A CN109336293A (en) | 2018-11-22 | 2018-11-22 | The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) |
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| CN201811400290.3A CN109336293A (en) | 2018-11-22 | 2018-11-22 | The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190215 |
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| RJ01 | Rejection of invention patent application after publication |