CN105271605A - Acrylonitrile wastewater treatment method - Google Patents
Acrylonitrile wastewater treatment method Download PDFInfo
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- CN105271605A CN105271605A CN201410331303.1A CN201410331303A CN105271605A CN 105271605 A CN105271605 A CN 105271605A CN 201410331303 A CN201410331303 A CN 201410331303A CN 105271605 A CN105271605 A CN 105271605A
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Abstract
The invention belongs to the technical field of industrial wastewater treatment, and concretely relates to an acrylonitrile wastewater treatment method. The method comprises the steps of homogenization, acidification, denitrification, nitrification and deposition. TMPD wastewater with very good biodegradability can be supplemented in the acrylonitrile wastewater treatment process as a carbon source, so the COD and total nitrogen treatment effect of acrylonitrile wastewater by a system is improved, and the problem of difficult standard reaching of direct treatment of the TMPD wastewater is solved, that is, purposes of waste control by waste, cost reduction and effect improvement are realized; and a new approach is provided for standard reaching treatment of the acrylonitrile wastewater. The method has the characteristics of simple flow and low running cost.
Description
Technical field
The invention belongs to industrial waste water treatment, be specifically related to a kind for the treatment of process of acrylic nitrile waste water.
Background technology
Vinyl cyanide is the organic cyanogen of a kind of hypertoxic type that is colourless, Semen Armeniacae Amarum taste, has high toxicity and potential genetoxic, and be one of noxious pollutant important in environment, it not only destroys water ecosystem, also the life and health of harm humans.Vinyl cyanide is one of the main raw material of synthon, synthetic resins, synthetic rubber and organic synthesis industry, is mainly used in the productions such as acrylic fibers, paracril, adiponitrile, acrylamide, ABS resin.At present, maximum production methods applied by domestic and international vinyl cyanide is propylene ammmoxidation process, namely with propylene, ammonia and air for main raw material, under the effect of certain reaction conditions (temperature: 445 ± 5 DEG C, pressure: 0.055 ~ 0.075MPa) and catalyzer (SAC-2000), generate vinyl cyanide and water, by product is mainly acetonitrile and sodium cyanide.Reaction product after over-quenching, absorption, the series of measures such as refining are separated, containing vinyl cyanide, acetonitrile, sodium cyanide, ammonia and by product propionitrile, acetone, acetaldehyde, acetic acid etc. in factory effluent.The water quality situation of acrylic nitrile waste water is: COD, at 1500 ~ 4000mg/L, ammonia nitrogen about 50mg/L, total nitrogen about 300mg/L, reaches as high as 700mg/L, prussiate at 2 ~ 3mg/L.The comparatively cost-effective treatment process of acrylic nitrile waste water is biological process, the most extensive with A/O process application.As everyone knows, biochemical reaction carries out the ratio that must ensure C, N, P suitable in water smoothly, usual anaerobic reaction C:N:P=500:5:1, aerobic reaction C:N:P=100:5:1.And the ratio of organism and total nitrogen is obviously on the low side in acrylic nitrile waste water, therefore biochemical treatment difficulty is larger.From disclosed bibliographical information, the way solving this problem is at present a large amount of supplementary carbon sources, and carbon source uses glucose, starch, methyl alcohol and ethanol usually, and therefore, the running cost of system is higher.
2, 2, 4-trimethylammonium-1, 3-pentanediol (TMPD) is a kind of important organic chemical industry's intermediate, at synthetic perfume, lubricating oil, topcoating, refining of petroleum, in textile printing and dyeing and foodstuffs industry, tool has been widely used, TMPD production technique waste water is high concentrated organic wastewater, containing isobutyric aldehyde, propyl carbinol, butanic acid, isopropylcarbinol, isobutyl ester, pungent pentanediol etc., the COD of waste water is at 70000 ~ 100000mg/L, be without nitrogenous source in water, without phosphorus source, because this wastewater biodegradability is very good, the process of current employing engineering bacteria one-step oxidation process, hydraulic detention time (HRT) is 160h, COD enters sewage farm advanced treatment after dropping to about 300mg/L.The expense of the method process waste water is very high, and a large amount of excess sludges produced also are difficult to dispose.
Chinese patent CN103641277A (201310681566.0) " treatment process of acrylic nitrile waste water ", the technical process that this invention adopts is: short-cut nitrification and denitrification-anoxic-precipitation-catalyzed oxidation-BAF, process acrylic nitrile waste water.The advantage of this technology be COD, ammonia nitrogen clearance higher, water outlet reaches GB8978-1996 first discharge standard.Shortcoming is long flow path, needs in anoxic pond, add a large amount of carbon source (methyl alcohol, ethanol), and to meet the carbon-nitrogen ratio needed for denitrification, running cost is higher.
Chinese patent CN202016935U (201120121780.7) " a kind of containing nitrile wastewater denitrification treatment apparatus ", the technical process that this utility model adopts is: equalizing tank-anaerobic pond-settling tank-oxygen compatibility pool-Aerobic Pond-sludge sump, process is containing nitrile waste water, anaerobic pond is hung with semi soft packing, settling tank, built with swash plate, is all equipped with graded stuffing in oxygen compatibility pool, Aerobic Pond.The advantage of this technology is that the clearance of COD, ammonia nitrogen and total nitrogen is all higher, and water outlet reaches GB8978-1996 first discharge standard.Shortcoming is when adopting A/O technique to remove total nitrogen, require have higher carbon-nitrogen ratio just can reach higher nitric efficiency in sewage, the non-constant of biodegradability containing nitrile waste water, is difficult to provide a large amount of biodegradability carbon sources, the arbitrary way of the not mentioned biodegradability carbon source of this utility model.
Chinese patent CN102718362A (201210205190.1) " a kind of bioremediation of Wastewater from Acrylonitrile Production ", the technical process that this invention adopts is: all quality regulate-anaerobic-aerobic-nitrated-second ponds, process acrylic nitrile waste water.The feature of this technique adds semi soft packing in hypoxia response district to carry out biofilm, and biomass can significantly be increased.Shortcoming needs to add solid carbon source in front end, nitration reaction district, and this dosing method is easy to carbon source is degraded in nitration reaction district, and hypoxia response district can not get enough carbon sources supplement, will qualified discharge be difficult in theory.
Chinese patent CN103159374A (201110424220.3) " a kind for the treatment of process to the organic waste water containing vinyl cyanide material ", the technical process that this invention adopts is: materializing strategy (flocculating settling)-anoxic microbial hydrolytic acidifying-aerobic microbiological biochemistry-treating technology (Fenton reagent oxidation, in alkali and coagulation), this combination process effectively can process the high concentration hard-degraded organic waste water containing vinyl cyanide material produced in polyacrylonitrile production process.This invention be suitable for influent COD≤1000mg/L containing acrylic nitrile waste water, need to add to form nutritive salt by glucose, urea and potassium primary phosphate mixture, running cost is high, and COD removal efficiency is low, and effluent quality does not reach the requirement of GB8978-1996 primary standard.
Chinese patent CN102399044B (201110371133.6) " a kind of integrated processing method of Wastewater from Acrylonitrile Production ", the technical process that this invention adopts is: equalizing tank-A/O biochemical treatment-filtration-reverse osmosis device, process acrylic nitrile waste water.In this technique, feed water by reverse osmosis COD is up to 118mg/L, and the cleaning of system and maintenance cost are very high, and reverse osmosis produced water COD is 72mg/L, and the risk of carrying out reuse as circulating cooling make up water is higher.
Summary of the invention
The object of this invention is to provide a kind for the treatment of process of acrylic nitrile waste water, contaminant removal efficiency is high, standard water discharge, flow process are simple, running cost is low.
Acrylic nitrile waste water of the present invention is the waste water that propylene ammmoxidation process produces vinyl cyanide generation, the main water quality characteristic of waste water is COD at 1500 ~ 4000mg/L, BOD/COD 0.25 ~ 0.50, ammonia nitrogen about 50mg/L, total nitrogen about 300mg/L, reaches as high as 700mg/L, prussiate at 2 ~ 3mg/L.TMPD waste water is the high concentrated organic wastewater produced in TMPD production process, main water quality characteristic be COD at 70000 ~ 100000mg/L, BOD/COD 0.60 ~ 0.75.
Technical process of the present invention is: homogeneous-acidifying-denitrification-nitrated-precipitation.
The treatment process of acrylic nitrile waste water of the present invention, step is as follows:
(1) homogeneous: acrylic nitrile waste water and TMPD waste water enter homogeneous pond, are provided with perforated pipe bottom homogeneous pond, pressurized air is introduced perforated pipe realizes water quality well-balanced adjustment by aeration agitation, in the water outlet of homogeneous pond, add microcosmic salt; The BOD value sum of acrylic nitrile waste water and TMPD waste water and the ratio of total nitrogen are 20:1-5:1;
(2) acidifying: the water outlet of homogeneous pond enters acidification pool acidification, installs stirring in slurry device in acidification pool, introduces in acidification pool when acidification pool starts by the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process;
(3) denitrification: enter the denitrification process of denitrification pond after the nitrification tank water outlet of acidification pool water outlet, backflow and the active sludge mixing of backflow;
(4) nitrated: the water outlet of denitrification pond enters nitrification tank nitration treatment, the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process, to denitrification pond, is introduced in nitrification tank when nitrification tank starts by nitration reaction effluent recycling;
(5) precipitate: nitrification tank water outlet enters after settling tank precipitates further, the content of supernatant C OD and ammonia nitrogen can reach municipal sewage plant and accept standard, active sludge major part after precipitation returns to denitrification pond, and small part is disposed as excess sludge.
Acidification condition described in step (2) is that hydraulic detention time HRT controls at 24-30h, and dissolved oxygen DO is less than 0.3mg/L.
Denitrification treatment condition described in step (3) are that hydraulic detention time HRT controls at 20-25h, and dissolved oxygen DO is less than 0.5mg/L.
Nitration treatment condition described in step (4) is that hydraulic detention time HRT controls at 40-50h, and dissolved oxygen DO is 3-5mg/L, pH is 6.0-9.0.
Nitration reaction effluent recycling described in step (4) is 1-5 to the reflux ratio in denitrification pond.
The treatment process of acrylic nitrile waste water of the present invention, concrete steps are as follows:
(1) homogeneous: acrylic nitrile waste water and TMPD waste water enter homogeneous pond by pipeline by a certain percentage, are provided with perforated pipe bottom homogeneous pond, pressurized air is introduced perforated pipe realizes water quality well-balanced adjustment by aeration agitation.
Acrylic nitrile waste water is relevant with total nitrogen content with the BOD value of two kinds of sewage with the blending ratio of TMPD waste water, usually requires that the BOD value sum of two kinds of sewage and the ratio of total nitrogen are 20:1-5:1.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying: the water outlet of homogeneous pond enters acidification pool, by the metabolism of acidification bacteria, under anoxic condition, the macromole organic pollutant of part difficult degradation is broken down into small molecules organic pollutant; Part propylene nitrile, prussiate etc. are decomposed into small molecules, easily degraded to the pollutent of the toxic effect of biology and pollutent to biological nontoxic or low toxicity; Ammonifying bacteria can be converted into free ammonia nitrogen by containing the nitrogen-containing group in N organism, and the ammonia nitrogen concentration in sewage will raise, and completes simultaneously and removes the part of waste water COD.
Acidification pool planted agent installs stirring in slurry device; Hydraulic detention time HRT controls at 24-30h; Dissolved oxygen DO is less than 0.3mg/L; Acidification pool needs the active sludge in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.
(3) denitrification: acidification pool water outlet enters denitrification pond after mixing with the nitrification tank water outlet of backflow and the active sludge of backflow, denitrifying bacterium utilizes the organic carbon source of acidification pool water outlet that the NO3-N and NO2-N in nitrification tank water outlet is reduced to N
2discharge into the atmosphere, thus complete total nitrogen and thoroughly remove from sewage, simultaneously by most of organic substance decomposing, COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
Denitrification tank waterpower residence time HRT controls at 20-25h; Dissolved oxygen DO is less than 0.5mg/L.
(4) nitrated: the water outlet of denitrification pond enters nitrification tank, the microorganism in water continues residual organic substances to resolve into CO
2and H
2o, mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.Nitration reaction water outlet is back to denitrification pond in proportion, for anti-nitration reaction provides necessary NO3-N and NO2-N.Nitration reaction effluent recycling is 1-5 to the reflux ratio in denitrification pond.
Nitrification tank needs the active sludge in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 40-50h; Dissolved oxygen DO is at 3-5mg/L; PH is at 6.0-9.0.
(5) precipitate: the water outlet of nitration reaction district enters after settling tank precipitates further, and the content of supernatant C OD and ammonia nitrogen can reach municipal sewage plant and accept standard.Active sludge major part after precipitation returns to denitrification pond, and small part is disposed as excess sludge.
The present invention mixes a certain proportion of TMPD high concentrated organic wastewater in acrylic nitrile waste water, is fully used by TMPD high concentrated organic wastewater as organic carbon source, reaches the object of the treatment of wastes with processes of wastes against one another, cost efficiency.The method is applicable to the process of the fine waste water of propylene, has the advantages that contaminant removal efficiency is high, standard water discharge, flow process are simple, running cost is low.
By provided by the invention by acrylic nitrile waste water and TMPD waste water mixed processing method by a certain percentage, after homogeneous-acidifying-denitrification-nitration treatment, water outlet can reach municipal sewage plant and accept standard.
The present invention compared with prior art, has following beneficial effect:
Extraordinary for biodegradability TMPD waste water adds in the process of acrylic nitrile waste water as carbon source by the present invention, this technical scheme can not only improve system to acrylic nitrile waste water COD and total nitrogen treatment effect, and solve TMPD waste water and be difficult to the difficult problem that directly process is up to standard, namely the object of the treatment of wastes with processes of wastes against one another, cost efficiency is reached, provide a new way for acrylic nitrile waste water process up to standard again, this technique has the advantages that flow process is simple, running cost is low.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention;
In figure: 1, acrylic nitrile waste water; 2, TMPD waste water; 3, homogeneous pond; 4, acidification pool; 5, denitrification pond; 6, nitrification tank; 7, settling tank; 8, phosphorus source; 9, stripping reflux; 10, sludge reflux.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 4000mg/L, BOD/COD is 0.27, and ammonia nitrogen is 55mg/L, and total nitrogen is 687mg/L, and prussiate is 3mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 98000mg/L, BOD/COD is 0.72.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 18:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 8810mg/L, BOD is 5850mg/L, and total nitrogen is 650mg/L, BOD/ total nitrogen is 9.0.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 30h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 158mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 25h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 50h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is 3.5 to the reflux ratio in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 110mg/L, and ammonia nitrogen is 4.5mg/L, and prussiate is 0.5mg/L, can reach municipal sewage plant and accept standard.
Embodiment 2
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 2370mg/L, BOD/COD is 0.32, and ammonia nitrogen is 42mg/L, and total nitrogen is 420mg/L, and prussiate is 2.8mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 72000mg/L, BOD/COD is 0.69.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 25:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 4972mg/L, BOD is 3187mg/L, and total nitrogen is 418mg/L, BOD/ total nitrogen is 7.6.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 24h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 120mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 20h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 40h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is to the reflux ratio 3 in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 100mg/L, and ammonia nitrogen is 3.5mg/L, and prussiate is 0.4mg/L, can reach municipal sewage plant and accept standard.
Embodiment 3
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 3120mg/L, BOD/COD is 0.42, and ammonia nitrogen is 62mg/L, and total nitrogen is 625mg/L, and prussiate is 3mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 72000mg/L, BOD/COD is 0.69.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 33:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 5150mg/L, BOD is 2950mg/L, and total nitrogen is 590mg/L, BOD/ total nitrogen is 5.0.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 27h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 172mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 22.5h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 45h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is to the reflux ratio 5.0 in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 125mg/L, and ammonia nitrogen is 3.8mg/L, and prussiate is 0.5mg/L, can reach municipal sewage plant and accept standard.
Embodiment 4
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 1500mg/L, BOD/COD is 0.42, and ammonia nitrogen is 52mg/L, and total nitrogen is 253mg/L, and prussiate is 3mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 98000mg/L, BOD/COD is 0.72.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 20:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 6050mg/L, BOD is 4800mg/L, and total nitrogen is 240mg/L, BOD/ total nitrogen is 20.0.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 28.6h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 127mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 24h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 48h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is to the reflux ratio 3.5 in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 45mg/L, and ammonia nitrogen is 0.7mg/L, and prussiate is 0.1mg/L, can reach municipal sewage plant and accept standard.
Embodiment 5
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 1950mg/L, BOD/COD is 0.47, and ammonia nitrogen is 39mg/L, and total nitrogen is 280mg/L, and prussiate is 3mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 85000mg/L, BOD/COD is 0.68.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 25:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 5100mg/L, BOD is 3240mg/L, and total nitrogen is 270mg/L, BOD/ total nitrogen is 12.0.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 30h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 115mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 25h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 50h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is to the reflux ratio 4.5 in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 40mg/L, and ammonia nitrogen is 0.7mg/L, and prussiate is 0.1mg/L, can reach municipal sewage plant and accept standard.
Embodiment 6
The main water quality characteristic of certain acrylonitrile plant factory effluent is COD be 1500mg/L, BOD/COD is 0.42, and ammonia nitrogen is 52mg/L, and total nitrogen is 253mg/L, and prussiate is 3mg/L.The main water quality characteristic of certain TMPD factory waste water is COD be 98000mg/L, BOD/COD is 0.72.
(1) homogeneous:
Acrylic nitrile waste water enters homogeneous pond after mixing by the volume ratio of 20:1 with TMPD waste water, is provided with perforated pipe, pressurized air is introduced perforated pipe bottom homogeneous pond, is realized the well-balanced adjustment of water quality by aeration agitation.Water quality situation after adjustment: COD is 6050mg/L, BOD is 4800mg/L, and total nitrogen is 240mg/L, BOD/ total nitrogen is 20.0.
In the water outlet of homogeneous pond, add microcosmic salt supplement phosphoric needed for bio-metabolic process.
(2) acidifying:
Acidification pool needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in acidification pool when starting.Acidification pool planted agent installs stirring in slurry device, and hydraulic detention time HRT controls at 30h; Dissolved oxygen DO is less than 0.3mg/L.
Part can be converted into free ammonia nitrogen containing the nitrogen-containing group in N organism by Ammonifying bacteria, and the ammonia nitrogen concentration in sewage is increased to 127mg/L, completes simultaneously and removes the part of waste water COD.
(3) denitrification:
Denitrification tank waterpower residence time HRT controls at 25h; Dissolved oxygen DO is less than 0.5mg/L.
COD is significantly reduced.Anti-nitration reaction will produce a large amount of basicity, for follow-up nitration reaction to the demand of basicity.
(4) nitrated:
Nitrification tank needs the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process to introduce in nitrification tank when starting.Nitrification tank hydraulic detention time HRT controls at 50h; Dissolved oxygen DO is at 3-5mg/L; PH is at 7.3-8.5; Nitration reaction effluent recycling is to the reflux ratio 1.0 in denitrification pond.
Mineralized nitrogen is NO3-N and NO2-N by nitrifier, and ammonia nitrogen obtains effective elimination.
(5) precipitate:
The water outlet of nitration reaction district enters after settling tank precipitates further, and supernatant C OD is 55mg/L, and ammonia nitrogen is 1.7mg/L, and prussiate is 0.1mg/L, can reach municipal sewage plant and accept standard.
Claims (5)
1. a treatment process for acrylic nitrile waste water, is characterized in that step is as follows:
(1) homogeneous: acrylic nitrile waste water and TMPD waste water enter homogeneous pond, are provided with perforated pipe bottom homogeneous pond, pressurized air is introduced perforated pipe realizes water quality well-balanced adjustment by aeration agitation, in the water outlet of homogeneous pond, add microcosmic salt; The BOD value sum of acrylic nitrile waste water and TMPD waste water and the ratio of total nitrogen are 20:1-5:1;
(2) acidifying: the water outlet of homogeneous pond enters acidification pool acidification, installs stirring in slurry device in acidification pool, introduces in acidification pool when acidification pool starts by the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process;
(3) denitrification: enter the denitrification process of denitrification pond after the nitrification tank water outlet of acidification pool water outlet, backflow and the active sludge mixing of backflow;
(4) nitrated: the water outlet of denitrification pond enters nitrification tank nitration treatment, the active sludge produced in engineering bacteria one-step oxidation process process TMPD waster water process, to denitrification pond, is introduced in nitrification tank when nitrification tank starts by nitration reaction effluent recycling;
(5) precipitate: nitrification tank water outlet enters after settling tank precipitates further, the content of supernatant C OD and ammonia nitrogen can reach municipal sewage plant and accept standard, active sludge major part after precipitation returns to denitrification pond, and small part is disposed as excess sludge.
2. the treatment process of acrylic nitrile waste water according to claim 1, the acidification condition described in step (2) that it is characterized in that is that hydraulic detention time HRT controls at 24-30h, and dissolved oxygen DO is less than 0.3mg/L.
3. the treatment process of acrylic nitrile waste water according to claim 1, it is characterized in that the denitrification treatment condition described in step (3) are that hydraulic detention time HRT controls at 20-25h, dissolved oxygen DO is less than 0.5mg/L.
4. the treatment process of acrylic nitrile waste water according to claim 1, the nitration treatment condition described in step (4) that it is characterized in that is that hydraulic detention time HRT controls at 40-50h, and dissolved oxygen DO is 3-5mg/L, pH is 6.0-9.0.
5. the treatment process of acrylic nitrile waste water according to claim 1, is characterized in that the nitration reaction effluent recycling described in step (4) is 1-5 to the reflux ratio in denitrification pond.
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