CN101734832A - Treatment method of MDI wastewater - Google Patents
Treatment method of MDI wastewater Download PDFInfo
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- CN101734832A CN101734832A CN200910243205A CN200910243205A CN101734832A CN 101734832 A CN101734832 A CN 101734832A CN 200910243205 A CN200910243205 A CN 200910243205A CN 200910243205 A CN200910243205 A CN 200910243205A CN 101734832 A CN101734832 A CN 101734832A
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- hydraulic detention
- mdi
- reaction pond
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Abstract
The invention provides a treatment method of MDI wastewater, which treats the MDI wastewater by a combined process of a regulating reservoir + a mixed reaction pond + a settling pond + a volcanic anaerobic biofilter + a volcanic aeration biofilter, and water discharge indexes all accord with the second-level discharge standard of an integrated wastewater discharge standard (GB 8978-1996). Compared with the traditional treatment process, the invention has the advantages of high biomembrane activity, good discharged water quality, long back washing period, easy back washing, long service life of a carrier, water and energy saving, and the like.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, the method for wastewater treatment that produces in particularly a kind of diphenylmethanediisocyanate production process.
Background technology
Diphenylmethanediisocyanate (MDI) is one of main raw material of urethane industry.Aniline and formaldehyde being carried out condensation reaction under the hydrochloric acid catalyst effect, obtain polymethylene polyphenyl polyamine, utilize the polymethylene polyphenyl polyamine phosgenation reaction to produce monomer MDI and polymeric MDI again, is well-known method in the urethane industry.
The waste water that produces in the MDI production process comprises: the formaldehyde waste water that formaldehyde plant production is intermittently discharged, aniline (AN) and polyamines waste water that the production of condensation device is discharged continuously, the high-concentration desulfurized waste liquid of chlorobenzene (MCB) waste water that photochemical device production is discharged continuously and gas maker production periodic replacement.Organism mostly is hazardous and noxious substances in the MDI factory effluent, and biodegradability is poor, and BOD/COD=0.1～0.2 belongs to used water difficult to degradate.
The technology of present domestic processing MDI waste water adopts the suspended biological carrier of massive polyurethane material based on BAF, and in operational process, it is better to have an initial stage effluent quality, the unsettled shortcoming of long-time running water quality.In addition since the suspended biological carrier of massive polyurethane material wear no resistance, run off serious, be difficult for backwash, needs and frequently replenish, processing cost is remained high.Therefore the technology that needs a kind of novel processing MDI waste water of development.
Summary of the invention
The object of the present invention is to provide a kind of method of effective processing MDI waste water.
The object of the invention is achieved through the following technical solutions: MDI waste water passes through equalizing tank, mixed reaction pond, settling tank, volcanics anaerobic biofilter, volcanics BAF successively, the MDI discharged wastewater met the national standard after the processing.Concrete grammar is as follows:
MDI waste water at first enters equalizing tank, regulating pondage water quality; Enter mixed reaction pond then, add polymerization iron or the polyaluminium coagulants of 20～100ppm (preferred 30,40,50,70,80ppm) in the ingress; Waste water after the hybrid reaction precipitates through settling tank; The settling tank water outlet enters volcanics anaerobic biofilter and volcanics BAF successively; MDI discharged wastewater met the national standard after the processing.Described biological filter adopts volcanics as bio-carrier, and this bio-carrier is granular for there not being point, almost spherical irregular particle, coarse many micropores.Described volcanics bio-carrier tap density is 0.5～1g/cm
3, preferred 0.7～0.8g/cm
3
The basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process that adopts is:
Equalizing tank hydraulic detention time 10～14h;
Mixed reaction pond hydraulic detention time 15～20min;
Settling tank hydraulic detention time 2～4h;
Volcanics anaerobic biofilter hydraulic detention time 20～40h;
Volcanics BAF hydraulic detention time 20～40h.
Preferably: equalizing tank hydraulic detention time 12h;
Mixed reaction pond hydraulic detention time 17min;
Settling tank hydraulic detention time 3h;
Volcanics anaerobic biofilter hydraulic detention time 30h;
Volcanics BAF hydraulic detention time 30h.
The inventive method is compared with the technology of domestic present processing MDI waste water has following advantage:
(1) a whole set of technological design is reasonable, can guarantee that the every index long-term stability of water outlet reaches the secondary discharge standard among " integrated wastewater discharge standard " (GB 8978-1996);
(2) as the volcanics surface micropore prosperity of biological filter bio-carrier, hole shape is horn-like, and have positive charge, more help microorganism set growth, therefore be easy to biofilm, biomass is big, makes anaerobic biofilter and BAF all have the ability of higher volumetric loading and anti-shock loading;
(3) the volcanics bio-carrier is little to flow resistance, be difficult for to stop up, and water distribution, gas distribution are even, thereby backwashing period is long, has reduced the water that causes because of back flushing and has consumed;
(4) volcanics bio-carrier tap density is little, makes that back flushing is easier to be carried out, thereby the energy consumption when having reduced aeration and back flushing;
(5) backwash bio-carrier later, biomembranous activity is extremely strong, can resume operation soon;
(6) volcanics bio-carrier long period of soaking is water insoluble, more can not produce the loose phenomenon of quality, and rate of expansion is low, the intensity height, in the operational process wearing and tearing little, reach work-ing life more than 10 years, year supplementary rate is less than 1%, thereby greatly reduces processing cost.
Description of drawings
Fig. 1 handles the process flow sheet of MDI waste water for the present invention.
Embodiment
Certain MDI manufacturing enterprise produces MDI waste water, always handles water yield 150m
3/ h.The influent quality of system is: COD
Cr≤ 3000mg/L, formaldehyde≤100mg/L, AN≤600mg/L, MCB≤100mg/L, Na
2S
2O
3≤ 4000mg/L, pH=5～12.Effluent quality requires to meet " integrated wastewater discharge standard " secondary discharge standard in (GB8978-1996), i.e. COD
Cr≤ 120mg/L, formaldehyde≤2.0mg/L, AN≤2.0mg/L, MCB≤0.4mg/L, Na
2S
2O
3≤ 1.0mg/L, pH=6～9.
Adopt " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process, the MDI waste water that this enterprise produces is handled.The every index of water outlet through long term monitoring is as follows: COD
Cr: 25～104mg/L, formaldehyde: do not detect～0.1mg/L AN: do not detect～0.5mg/L MCB: do not detect～0.1mg/L Na
2S
2O
3: do not detect, pH=7.7～8.9 meet the secondary discharge standard among " integrated wastewater discharge standard " (GB 8978-1996) fully.
Claims (10)
1. MDI method of wastewater treatment, it is characterized in that this method is: MDI waste water passes through equalizing tank, mixed reaction pond, settling tank, volcanics anaerobic biofilter, volcanics BAF successively, MDI discharge of wastewater after the processing, concrete steps are as follows: MDI waste water at first enters equalizing tank; Enter mixed reaction pond then, add polymerization iron or polyaluminium coagulants in the ingress; Waste water after the hybrid reaction precipitates through settling tank; The settling tank water outlet enters volcanics anaerobic biofilter and volcanics BAF successively; MDI discharge of wastewater after the processing.
2. MDI method of wastewater treatment according to claim 1 is characterized in that the described biological filter employing of this method volcanics as bio-carrier, and this bio-carrier is granular for there not being point, almost spherical irregular particle, coarse many micropores.
3. MDI method of wastewater treatment according to claim 1 and 2 is characterized in that the described volcanics bio-carrier of this method tap density is 0.5～1g/cm
3, or 0.7～0.8g/cm
3
4. MDI method of wastewater treatment according to claim 1 and 2 is characterized in that waste water enters mixed reaction pond in this method, and the amount that adds polymerization iron or polyaluminium coagulants in the ingress is 20～100ppm, or 30,40,50,70,80ppm.
5. MDI method of wastewater treatment according to claim 3 is characterized in that waste water enters mixed reaction pond in this method, and the amount that adds polymerization iron or polyaluminium coagulants in the ingress is 20～100ppm, or 30,40,50,70 or 80ppm.
6. according to claim 1,2 or 5 described MDI method of wastewater treatment, it is characterized in that the basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process of adopting is:
Equalizing tank hydraulic detention time 10～14h;
Mixed reaction pond hydraulic detention time 15～20min;
Settling tank hydraulic detention time 2～4h;
Volcanics anaerobic biofilter hydraulic detention time 20～40h;
Volcanics BAF hydraulic detention time 20～40h.
7. MDI method of wastewater treatment according to claim 3 is characterized in that the basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process of adopting is:
Equalizing tank hydraulic detention time 10～14h;
Mixed reaction pond hydraulic detention time 15～20min;
Settling tank hydraulic detention time 2～4h;
Volcanics anaerobic biofilter hydraulic detention time 20～40h;
Volcanics BAF hydraulic detention time 20～40h.
8. MDI method of wastewater treatment according to claim 4 is characterized in that the basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process of adopting is:
Equalizing tank hydraulic detention time 10～14h;
Mixed reaction pond hydraulic detention time 15～20min;
Settling tank hydraulic detention time 2～4h;
Volcanics anaerobic biofilter hydraulic detention time 20～40h;
Volcanics BAF hydraulic detention time 20～40h.
9. MDI method of wastewater treatment according to claim 6 is characterized in that the basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process of adopting is:
Equalizing tank hydraulic detention time 12h;
Mixed reaction pond hydraulic detention time 17min;
Settling tank hydraulic detention time 3h;
Volcanics anaerobic biofilter hydraulic detention time 30h;
Volcanics BAF hydraulic detention time 30h.
10. according to claim 7 or 8 described MDI method of wastewater treatment, it is characterized in that the basic design parameters of " equalizing tank+mixed reaction pond+settling tank+volcanics anaerobic biofilter+volcanics BAF " combination process of adopting is:
Equalizing tank hydraulic detention time 12h;
Mixed reaction pond hydraulic detention time 17min;
Settling tank hydraulic detention time 3h;
Volcanics anaerobic biofilter hydraulic detention time 30h;
Volcanics BAF hydraulic detention time 30h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243205A CN101734832A (en) | 2009-12-29 | 2009-12-29 | Treatment method of MDI wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243205A CN101734832A (en) | 2009-12-29 | 2009-12-29 | Treatment method of MDI wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101734832A true CN101734832A (en) | 2010-06-16 |
Family
ID=42458943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910243205A Pending CN101734832A (en) | 2009-12-29 | 2009-12-29 | Treatment method of MDI wastewater |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102139976A (en) * | 2011-02-22 | 2011-08-03 | 上海化学工业区中法水务发展有限公司 | Treatment method for saliferous waste water from production process of MDI |
| CN109928582A (en) * | 2019-04-18 | 2019-06-25 | 南京清元景和环境科技有限公司 | Biological, the chemically composited processing method of formaldehyde-containing wastewater |
| CN109987692A (en) * | 2019-04-02 | 2019-07-09 | 温州医科大学 | The method of Fenton-like enhancing processing organic wastewater based on acetaldehyde acid construct |
-
2009
- 2009-12-29 CN CN200910243205A patent/CN101734832A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102139976A (en) * | 2011-02-22 | 2011-08-03 | 上海化学工业区中法水务发展有限公司 | Treatment method for saliferous waste water from production process of MDI |
| CN109987692A (en) * | 2019-04-02 | 2019-07-09 | 温州医科大学 | The method of Fenton-like enhancing processing organic wastewater based on acetaldehyde acid construct |
| CN109928582A (en) * | 2019-04-18 | 2019-06-25 | 南京清元景和环境科技有限公司 | Biological, the chemically composited processing method of formaldehyde-containing wastewater |
| CN109928582B (en) * | 2019-04-18 | 2021-11-19 | 南京清元景和环境科技有限公司 | Biological and chemical composite treatment method for formaldehyde-containing wastewater |
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Application publication date: 20100616 |