CN103193366A - Integrated treatment method of corn alcohol wastewater - Google Patents
Integrated treatment method of corn alcohol wastewater Download PDFInfo
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- CN103193366A CN103193366A CN2013101605863A CN201310160586A CN103193366A CN 103193366 A CN103193366 A CN 103193366A CN 2013101605863 A CN2013101605863 A CN 2013101605863A CN 201310160586 A CN201310160586 A CN 201310160586A CN 103193366 A CN103193366 A CN 103193366A
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Abstract
The invention relates to an integrated treatment method of corn alcohol wastewater. The method is high in biochemical efficiency, simple to operate and low in treatment cost. Biochemical effluent is superior to a discharge standard of fermentation alcohol wastewater, and deep effluent meets a requirement of make-up water of industrial recycling cooling water. The method comprises the steps that a grid intercepts a thick and big suspended matter; the wastewater is cooled; a pH value of the wastewater is adjusted; the wastewater with the pH value being adjusted is pump into a hydrolytic acidification tank, and subjected to hydrolytic acidification, and then to anaerobic treatment by an internal recycling up-flow anaerobic sludge blanket; partial wastewater after the anaerobic treatment is subjected to aerobic treatment by a filling cyclic activated sludge system method; partial wastewater not subjected to the anaerobic treatment flows back to a water inlet of the up-flow anaerobic sludge blanket, and then enters the up-flow anaerobic sludge blanket for the anaerobic treatment; blasting is required in the aerobic treatment process; and the wastewater after the aerobic treatment enters an intermediate water well, is precipitated in a coagulative precipitation tank, then enters a multi-medium filter for filtering, and is disinfected. The method is simple to operate, low in treatment cost, and high in biochemical efficiency.
Description
Technical field
The present invention relates to wastewater treatment, particularly a kind of integrated processing method of corn alcohol waste water.
Background technology
Corn alcohol waste water is distillation leftover---the alcohol residue (high concentrated organic wastewater) of simple distillation tower bottom discharging when being raw material distillation fermenting-ripening wine with dregs with the corn, and the washing water in the production process (middle concentration organic waste water) and water coolant.The corn alcohol wastewater discharge is big, and the waste water that 1 ton of alcohol of every production is discharged is 10 ~ 14 tons, is the alcohol industry important pollution sources.Corn alcohol waste water principal pollutant are CODcr, NH3-N, SS, and its concentration is respectively at 3000 ~ 15000mg/L, 10 ~ 35mg/L, between 800 ~ 2500mg/L.Other pollutent mainly comprises: be suspended in grease, starch, glue in the waste water; Be dissolved in sugar in the water, acid, alkali, salt etc.; Average water temperature reaches 75 ℃, and the wastewater temperature of discharging at the bottom of the still kettle is up to 100 ℃; The suspension content height, wherein organism accounts for 94% ~ 95%, and ash content accounts for 5% ~ 6%; Outward appearance muddiness, colourity height, easily corrupt.The waste water color is darker, can not directly enter water body, otherwise can influence the photosynthesis of waterplant and algae, reduces oxygen in water concentration, thereby influences the growth of hydrocoles.Corn alcohol waste water is acid (pH generally is lower than 5.5), contains phosphoric acid salt and organic acid, and corrodibility is strong.The crops is not only burnt in the direct irrigation and drainage of these organic acids and mineral acid farmland to death, and makes soil compaction.In addition, contain a large amount of low molecular compounds in the corn alcohol waste water, as butanols, ethanol, acetone etc., and organism such as a large amount of carbohydrate, nitrogen compound, fat, nitrogen, phosphorus content height are if directly discharging can cause body eutrophication.
The treatment process that adopts both at home and abroad mainly is biochemical treatment process at present.
Main component in the corn alcohol waste water mostly is the available nutritive substance of microorganism, and the biodegradability of waste water is good, therefore more often adopts biochemical process to handle to this waste water both at home and abroad.The characteristics high according to this class concentration of organic wastewater, the method for employing mainly are anaerobism+aerobic treatment.Biochemical process is the method the most widely that present corn alcohol wastewater treatment is adopted, and has obtained certain removal effect.But still exist weak point: the anaerobic treatment time is longer, and reactor initial start-up process is slow, and concentration of suspension height in the corn alcohol waste water, has limited the operating performance of anaerobic reactor.The winter operation instability is big to the fluctuation of ammonia nitrogen removal effect.Since implementing in January, 2012 " fermentation alcohol and liquor industry pollution discharge standard ", grain distillery's contaminated wastewater thing discharging is no longer carried out " integrated wastewater discharge standard " (GB8978-1996), the strictness of operative norm has phenomenon not up to standard when having caused the waste water of part grain distillery discharging.Simultaneously anaerobic process is not obvious to the chromaticity removing effect of corn alcohol waste water with aerobic method, thus explore a kind of easy and simple to handle, treatment effect good, less investment, corn alcohol waste water treatment process that working cost is low are problems of needing solution badly.
Summary of the invention
At above-mentioned situation, for overcoming the defective of prior art, the present invention's purpose just provides a kind of integrated processing method of corn alcohol waste water, can effectively solve the biochemical efficiency height, simple to operate, processing costs is low, bio-chemical effluent is better than the fermentation alcohol wastewater discharge standard, the problem that industrial circulating cooling water replenishes the water water quality requirement is satisfied in degree of depth water outlet simultaneously.
The technical scheme that the present invention solves is at first to regulate wastewater pH at equalizing tank; With the waste water acidifying pre-treatment that is hydrolyzed, to remove part suspended substance in the waste water, improve the biodegradability of waste water, the acidication hydraulic detention time is 10 ~ 12h; The waste water after acidication is handled is carried out internal recycle upflow type anaerobic sewage sludge reactor (UASB claims upflow anaerobic sludge blanket process again) anaerobic treatment, the unlatching of internal recycle can be from main regulation upflow type anaerobic sewage sludge reactor (UASB) volumetric loading again; And then the waste water after the anaerobic treatment carried out filler circulating type active sludge method (CASS) aerobic treatment, adopt coagulating sedimentation-filtration and sterilization process to carry out advanced treatment the waste water after the aerobic treatment at last, the steps include: that grid tackles thick suspended substance, through the cooling tower cooling, enter equalizing tank and regulate the pH value; Waste water pump behind the adjust pH is gone into the hydrolysis acidification pool, acidication is by internal recycle upflow type anaerobic sewage sludge reactor anaerobic treatment, part waste water after the anaerobic treatment carries out filler circulating type active sludge method aerobic treatment, without the part return of waste water of anaerobic treatment to upflowing anaerobic sludge reactor water-in, enter the upflow type anaerobic sewage sludge reactor again, carry out anaerobic treatment, to carry out air blast in the aerobic treatment process, well in the middle of waste water after the aerobic treatment enters, carry out the coagulative precipitation tank post precipitation again, enter hypermedia strainer and filter, after sterilization, can reach emission standard, recycling.
That the integrated treatment technology of the present invention has is simple to operate, processing costs is low, biochemical efficiency is high, and degree of depth water outlet can be satisfied " Code for design of industrial recirculating cooling water treatment " (GB50050-2007) requirement, is that one in the corn alcohol wastewater treatment innovated greatly.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Provided by accompanying drawing, the present invention at first regulates wastewater pH at equalizing tank in concrete enforcement; With the waste water acidifying pre-treatment that is hydrolyzed, to remove part suspended substance in the waste water, improve the biodegradability of waste water, the acidication hydraulic detention time is 10-12h; The waste water after acidication is handled is carried out internal recycle upflow type anaerobic sewage sludge reactor (UASB claims upflow anaerobic sludge blanket process again) anaerobic treatment, the unlatching of internal recycle can be from main regulation upflow type anaerobic sewage sludge reactor (UASB) volumetric loading again; And then the waste water after the anaerobic treatment carried out filler circulating type active sludge method (CASS) aerobic treatment, and adopt coagulating sedimentation-filtration and sterilization process to carry out advanced treatment the waste water after the aerobic treatment at last, its concrete steps are:
(1) waste water is removed thick suspended substance through the grid interception of spacing 5mm earlier after entering sewage plant, enter cooling tower again wastewater temperature is down to 38-40 ℃, the cooling tower water outlet is from flowing into equalizing tank, and regulating wastewater pH by sodium hydroxide lye is 6.0 ± 0.5, and the equalizing tank surface load is 0.7-0.8m
3/ m
2H, hydraulic detention time 2.5-3h;
(2) waste water pump behind pH regulator is gone into the acidifying that is hydrolyzed of hydrolysis acidification pool, hydraulic detention time is 10-12h; Through the waste water of acidication, wastewater flow rate is made as Q
1, pumping into internal recycle upflow type anaerobic sewage sludge reactor water inlet pipe, part is by the waste water of upflow type anaerobic sewage sludge reactor internal circulation apparatus backflow simultaneously, and the wastewater flow rate of backflow is made as Q
2, being incorporated in the water inlet pipe of internal recycle upflow type anaerobic sewage sludge reactor, the water yield is made as Q in the water inlet pipe, Q=Q
1+ Q
2, reflux ratio Q
2︰ Q
1=50-300 ︰ 100(is Q
2︰ Q
1=50-300%), the water distribution system by its bottom is evenly distributed to mixed waste water in the internal recycle upflow type anaerobic sewage sludge reactor, thereby realize volumetric loading from main regulation;
(3) waste water after internal recycle upflow type anaerobic sewage sludge reactor anaerobic treatment is carried out aerobic treatment from flowing into filler circulating type active sludge method pond, the volumetric loading in filler circulating type active sludge method pond is 0.3-0.5 kgBOD/m
3D, dissolved oxygen concentration is 2.0-2.5mg/L, sludge concentration 4000-5000 mg/L, the pond water outlet of filler circulating type active sludge method well in the middle of flowing in the gas blower aeration rate control pond by regulating, and the hydraulic detention time of middle well is 3-4h;
(4) waste water after step (3) is handled is pumped into coagulative precipitation tank, add polyaluminium sulfate (PAS) by volume pump in the pond simultaneously and carry out coagulation, every processing 1m
3Waste water polyaluminium sulfate dosage is 60g; The coagulating sedimentation water outlet pumps into more medium filter, fills gravel, quartz sand, hard coal medium in the more medium filter from top to bottom; Adopt dioxide peroxide (ClO
2) producer is to filtering water outlet disinfection, every 1m
3The dioxide peroxide dosage is 20g in the waste water; After disinfecting, namely become and reach " Code for design of industrial recirculating cooling water treatment " (GB50050-2007) requirement.
In order to guarantee result of use, the internal reflux pipeline is set up in gap between the granular mud bed and triphase separator of the main part of described internal recycle upflow type anaerobic sewage sludge reactor, internal circulation system helps to regulate wastewater temperature and pH value, improve upflow velocity, promote the muddy water mixing efficiency, shorten upflow type anaerobic sewage sludge reactor starting period and granule sludge culture cycle, improve the sewage purification processing efficiency, reduce the terminal pollution load (namely to solve the terminal higher problem of pollution load of handling) of handling; Internal circulation system is realized autonomous volume adjusted load by regulating reflux ratio;
Described filler circulating type active sludge method pond, by straining at reaction tank below the hydrophone 0.5m, more than the 1.0m of bottom, pond net cage is set, (the suspension ball is the commercially available prod to filling diameter 8cm suspension ball in the net cage, as the high plumbing equipment in Henan, Gongyi City factory, the shine product of emerging plastics factory of Hebei) as circulating type active sludge method pond filler, filler can effectively avoid the aeration bubble to the shearing of its surface biological film, reducing current washes away biomembranous, thereby be conducive to microorganic adhesion, microbial film thickness increases gradually, final microbial film thickness is probably at 0.4mm, synchronous nitration and denitrifying condition have been created, make some generation times longer, the nitrifier more less than value-added speed adhered to breeding, finally reaches CASS pond enhanced biological denitrification effect; Biophase is abundant in the microbial film, has prolonged microorganism food chain, has improved biomass, thereby promotes the impact resistance in CASS pond; Dosing of filler can be reduced sludge yield in addition, thereby is difficult for producing sludge bulking.
Also need explanation to be:
(1) grid
Because big floating matter and particulate matter in the corn alcohol waste water are all fewer, the pollutent of grid interception is few, selects artificial scarfing cinder mode for use; Grid spacing 5mm.
(2) cooling tower
Because the corn alcohol wastewater temperature is too high, surpass the scope that microorganism can bear, need waste water be stablized by cooling tower and be down to 38 ~ 40 ℃, so that follow-up biological process is carried out smoothly.
(3) equalizing tank
Because corn alcohol waste water is acid waste water, warm methanogen growth during waste water ph hangs down and is not suitable for need add alkali and regulate about waste water to 6.0, so that follow-up biological process is carried out smoothly.
(4) hydrolysis acidification pool
Equalizing tank water pumps in the hydrolysis acidification pool.Hydrolysis acidification pool has been created the acidifying that is hydrolyzed of certain amphimicrobian environment to sewage, the acidication process of anaerobic treatment takes place, the material decomposition of difficult degradation is become the organic substrates of degraded easily, waste water is because acidification partly is converted into voltaile fatty acid simultaneously, and the filler in the pond can be removed part suspended substance in the waste water by adsorption in addition.Anaerobic reactor partial reflux water with pump into internal recycle UASB reactor after the acidication water outlet mixes, to reduce anaerobic reactor entering organic matter of water concentration.The hydrolysis acidification pool hydraulic detention time is 10 ~ 12h.
(5) internal recycle UASB reactor
Internal recycle UASB sets up internal circulation apparatus in reactor triphase separator bottom, internal circulation system helps to regulate wastewater temperature and pH, can improve upflow velocity, promote the muddy water mixing efficiency, obviously shorten UASB reactor start-up phase and granule sludge culture cycle, improve the sewage purification processing efficiency, organism in the removal waste water by a relatively large margin can solve the terminal higher problem of pollution load of handling; Internal circulation system can be realized autonomous volume adjusted load by regulating reflux ratio in addition.
(6) filler CASS pond
Internal recycle UASB water outlet is from flowing in the filler CASS pond, and flooding velocity is regulated and control by distribution apparatus.In filler CASS pond, make good use of the effect of oxygen animalcule, organism is further degraded, thereby waste water is purified, well in the middle of water outlet enters.Filler CASS pond bottom is provided with microporous aeration device, and dissolved oxygen concentration is 2.0 ~ 2.5mg/L in the gas blower aeration rate control pond by regulating, and top is established and strained hydrophone and carry out draining, and volumetric loading is 0.3 ~ 0.5 kgBOD/ (m
3D), sludge concentration 4000 ~ 5000 mg/L.
(7) well in the middle of
Enter coagulative precipitation tank in order to ensure waste water with stable flow velocity and load, well in the middle of arranging, filler CASS water outlet is well in the middle of flowing into, and middle well hydraulic detention time is 3 ~ 4h.
(8) coagulative precipitation tank
Waste water after aerobic treatment by being pumped to coagulative precipitation tank, being added PAS by volume pump in the pond simultaneously and carries out coagulation, every processing 1m
3Waste water PAS dosage is 60g.
(9) more medium filter
The coagulating sedimentation water outlet pumps into more medium filter, fills media such as gravel, quartz sand, hard coal in the strainer from top to bottom, by the adsorption of strainer medium, can effectively remove suspended substance and colourity in the waste water.
(10) sterilization pool
Filter water outlet and flow automatically into sterilization pool, adopt ClO
2Producer carries out disinfection every processing 1m to filtering water outlet
3Waste water ClO
2Dosage is 20g, satisfies industrial circulating cooling water after the filtration water outlet is sterile-processed and replenishes the water requirement.
By stating as can be seen, treatment process of the present invention is to adopt the COMBINED PROCESS of pre-treatment+internal recycle UASB anaerobic treatment+filler CASS aerobic treatment+coagulating sedimentation-filtration and sterilization process advanced treatment.Waste water elder generation handles through acidication, can reduce the concentration of hard-degraded substance and inhibition ion, the biodegradability of part suspended substance and raising waste water in the removal waste water; Waste water after acidication is handled enters internal recycle UASB anaerobic treatment workshop section, utilizes most of organism in the anaerobion degradation water; Filler CASS aerobic treatment, further degradation of organic substances are carried out in the anaerobism water outlet again; Turbidity of wastewater after aerobic treatment, microbial biomass are all bigger, adopt coagulating sedimentation-filtration and sterilization process advanced treatment at last, advanced treatment system can add dose by adjusting according to the treatment effect of biochemical system and guarantee that effluent quality satisfies recirculated cooling water and replenishes the water requirement.That the integrated treatment technology of the present invention has is simple to operate, processing costs is low, biochemical efficiency is high, guarantee that degree of depth effluent quality satisfies industrial circulating cooling water and replenishes advantages such as water requirement.
The present invention has obtained good useful technique effect through experiment and test, as:
Experimental example 1
The Henan corn distillery adopts the inventive method that this factory's waste water is handled, and former water COD is about 3500 mg/L, designing treatment amount 2000m
3, equalizing tank surface load 0.8m
3/ m
2H, hydraulic detention time 2.5h, hydrolyzing regulation pond hydraulic detention time 10h, volumetric loading 4.75 kgCOD/m of internal recycle UASB reactor
3D, upflow velocity are 0.45m/h, the volumetric loading 0.4kgBOD/m in CASS pond
3D, dissolved oxygen 2.5mg/L, sludge concentration 4500mg/L, outputted aerobic water COD average out to 60mg/L, NH
3-N average out to 0.8mg/L, every processing 1m
3Waste water PAS dosage is 60g,, fill media such as gravel, quartz sand, hard coal in the more medium filter from top to bottom, medium packing height 1.2m disinfects COD average out to 45mg/L, the NH of water outlet finally by crossing
3-N average out to 0.7mg/L satisfies industrial circulating cooling water and replenishes the water requirement.
Experimental example 2
The Henan corn distillery adopts the inventive method that this factory's waste water is handled, and former water COD is about 10000 mg/L, designing treatment amount 2000m
3, equalizing tank surface load 0.8m
3/ m
2H, hydraulic detention time 2.5h, hydrolyzing regulation pond hydraulic detention time 12h, volumetric loading 13.4 kgCOD/m of internal recycle UASB reactor
3D, upflow velocity are 0.3m/h, the volumetric loading 0.5kgBOD/m in CASS pond
3D, dissolved oxygen 2.5mg/L, sludge concentration 4500mg/L, outputted aerobic water COD average out to 65mg/L, NH
3-N average out to 1.0mg/L, every processing 1m
3Waste water PAS dosage is 60g,, fill media such as gravel, quartz sand, hard coal in the more medium filter from top to bottom, medium packing height 1.2m disinfects COD average out to 50mg/L, the NH of water outlet finally by crossing
3-N average out to 0.8mg/L satisfies industrial circulating cooling water and replenishes the water requirement.
Experimentize with different factories in different places through repeated multiple times, all obtained identical or akin result, show that method is reliable and stable, result of use is good, after tested: COD≤50mg/L, NH after sterile-processed
3-N≤1.0mg/L, SS≤5mg/L, turbidity≤5NTU, total Fe≤0.3mg/L and carbonate alkalinity≤100mg/L, satisfy " Code for design of industrial recirculating cooling water treatment " process water requirement (GB50050-2007), well satisfy industrial circulating cooling water and replenish the water requirement, realized corn alcohol Wastewater Recovery recycling, reduced environmental pollution, economize on resources and sewage disposal expense more than 1 times, production efficiency and biochemical efficiency improve more than 50%, economic and social benefit is huge, is that one in the corn alcohol wastewater treatment created greatly.
Claims (3)
1. the integrated processing method of a corn alcohol waste water is characterized in that, at first regulates wastewater pH at equalizing tank; With the waste water acidifying pre-treatment that is hydrolyzed, to remove part suspended substance in the waste water, improve the biodegradability of waste water, the acidication hydraulic detention time is 10-12h; The waste water after acidication is handled is carried out internal recycle upflow type anaerobic sewage sludge reactor anaerobic treatment, the unlatching of internal recycle can be from main regulation upflow type anaerobic sewage sludge reactor volumetric loading again; And then the waste water after the anaerobic treatment carried out filler circulating type active sludge method aerobic treatment, and adopt coagulating sedimentation-filtration and sterilization process to carry out advanced treatment the waste water after the aerobic treatment at last, its concrete steps are:
(1) waste water is removed thick suspended substance through the grid interception of spacing 5mm earlier after entering sewage plant, enter cooling tower again wastewater temperature is down to 38-40 ℃, the cooling tower water outlet is from flowing into equalizing tank, and regulating wastewater pH by sodium hydroxide lye is 6.0 ± 0.5, and the equalizing tank surface load is 0.7-0.8m
3/ m
2H, hydraulic detention time 2.5-3h;
(2) waste water pump behind pH regulator is gone into the acidifying that is hydrolyzed of hydrolysis acidification pool, hydraulic detention time is 10-12h; Through the waste water of acidication, wastewater flow rate is made as Q
1, pumping into internal recycle upflow type anaerobic sewage sludge reactor water inlet pipe, part is by the waste water of upflow type anaerobic sewage sludge reactor internal circulation apparatus backflow simultaneously, and the wastewater flow rate of backflow is made as Q
2, being incorporated in the water inlet pipe of internal recycle upflow type anaerobic sewage sludge reactor, the water yield is made as Q in the water inlet pipe, Q=Q
1+ Q
2, reflux ratio Q
2︰ Q
1=50-300 ︰ 100, the water distribution system by its bottom is evenly distributed to mixed waste water in the internal recycle upflow type anaerobic sewage sludge reactor, thereby realize volumetric loading from main regulation;
(3) waste water after internal recycle upflow type anaerobic sewage sludge reactor anaerobic treatment is carried out aerobic treatment from flowing into filler circulating type active sludge method pond, the volumetric loading in filler circulating type active sludge method pond is 0.3-0.5 kgBOD/m
3D, dissolved oxygen concentration is 2.0-2.5mg/L, sludge concentration 4000-5000 mg/L, the pond water outlet of filler circulating type active sludge method well in the middle of flowing in the gas blower aeration rate control pond by regulating, and the hydraulic detention time of middle well is 3-4h;
(4) waste water after step (3) is handled is pumped into coagulative precipitation tank, add polyaluminium sulfate (PAS) by volume pump in the pond simultaneously and carry out coagulation, every processing 1m
3Waste water polyaluminium sulfate dosage is 60g; The coagulating sedimentation water outlet pumps into more medium filter, fills gravel, quartz sand, hard coal medium in the more medium filter from top to bottom; Adopt dioxide peroxide (ClO
2) producer is to filtering water outlet disinfection, every 1m
3The dioxide peroxide dosage is 20g in the waste water.
2. the integrated processing method of corn alcohol waste water according to claim 1, it is characterized in that, the internal reflux pipeline is set up in gap between the granular mud bed and triphase separator of the main part of described internal recycle upflow type anaerobic sewage sludge reactor, internal circulation system helps to regulate wastewater temperature and pH value, improve upflow velocity, promote the muddy water mixing efficiency, shorten upflow type anaerobic sewage sludge reactor starting period and granule sludge culture cycle, improve the sewage purification processing efficiency, reduce the terminal pollution load of handling, internal circulation system is realized autonomous volume adjusted load by regulating reflux ratio.
3. the integrated processing method of corn alcohol waste water according to claim 1, it is characterized in that, described filler circulating type active sludge method pond, by straining at reaction tank below the hydrophone 0.5m, more than the 1.0m of bottom, pond net cage is set, filling diameter 8cm suspension ball is as circulating type active sludge method pond filler in the net cage, filler can effectively avoid the aeration bubble to the shearing of its surface biological film, reducing current washes away biomembranous, thereby be conducive to microorganic adhesion, microbial film thickness increases gradually, final microbial film thickness is probably at 0.4mm, synchronous nitration and denitrifying condition have been created, make some generation times longer, the nitrifier more less than value-added speed adhered to breeding, finally reaches CASS pond enhanced biological denitrification effect; Biophase is abundant in the microbial film, has prolonged microorganism food chain, has improved biomass, thereby promotes the impact resistance in CASS pond; Dosing of filler can be reduced sludge yield in addition, thereby is difficult for producing sludge bulking.
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| CN105110553A (en) * | 2015-08-05 | 2015-12-02 | 山东益源环保科技有限公司 | Method for treating high-concentration starch wastewater |
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| CN112299640A (en) * | 2019-07-26 | 2021-02-02 | 杭州维清环保工程有限公司 | Method for treating waste mash of corn alcohol |
| CN112299640B (en) * | 2019-07-26 | 2022-10-18 | 杭州维清环保工程有限公司 | Method for treating waste mash of corn alcohol |
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