CN103373747B - The evaporating concentrating method of yeast wastewater - Google Patents
The evaporating concentrating method of yeast wastewater Download PDFInfo
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Abstract
The invention provides a kind of evaporating concentrating method of yeast wastewater.The method comprises: (1) evaporization process, and yeast wastewater enters well heater (1) and heat-treats, and makes wastewater temperature be heated to 78-82 DEG C and carries out evaporating the two-phase stream obtaining comprising gas phase and liquid phase; (2) separation circuit, described two-phase stream is separated in separator (2); (3) steam compression cycle operation, then separating obtained secondary steam obtains compressing secondary steam through vapour compressor (3) process, and described compression secondary steam loops back well heater (1) thermal source recycling as a supplement; (4) mother liquor evaporization process again, separating obtained Recycling Mother Solution in separator (2) is returned well heater (1), again carry out (1) evaporization process, until solids level concentration is 10-14% (w/w) in yeast wastewater.The present invention reduces steam consumption, reduce cost for wastewater treatment.
Description
Technical field
The present invention relates to field of waste water treatment, particularly relate to a kind of evaporating concentrating method adopting the yeast wastewater of MVR technology.
Background technology
Produce raw material mainly cane sugar factory or the rear waste molasses produced of beet-sugar factory sugaring of live yeast.Molasses are the wastes in sugar refinery, very large on the impact of environment.Along with the development of yeast fermentation technology, use waste molasses production live yeast to become at present and effectively utilize waste molasses both at home and abroad, solve one of effective way of sugar plant pollution.But, in the production of live yeast, what can utilize is effective ingredient in molasses, the new organism that the carbohydrate cannot degraded in yeast fermentation, colloid and yeast metabolism produce again etc. are then along with the links in the flow process of producing discharges system, if these waste water directly discharge, great pollution will be caused to receiving water body.Therefore, after waste water has to pass through governance for reaching standard, could directly discharge.
Utilize molasses to produce the waste water produced in yeast process and belong to high concentrated organic wastewater, its COD (chemical oxygen demand (COD)) concentration is high, and containing the abundant inorganic microelement such as nitrogen, phosphorus, potassium, calcium, iron, biodegradability energy extreme difference.Usually adopt multiple-effect evaporation concentration systems to carry out concentration to the organic waste water of high density like this at present, its effect is better, but multiple-effect evaporation energy consumption is too high, and particularly steam consumption is very high.
MVR technology refers to mechanical steam recompression technology, its principle of work: it utilizes compressor mechanical work to improve the temperature of the secondary steam of vaporizer generation, again this secondary steam input vapo(u)rization system that improve temperature is used as heat-source Cycles, substitute the raw steam of the overwhelming majority, the raw steam of minute quantity only loses and heat content needed for the input and output material temperature difference for supplemental heat, thus significantly reduce the raw steam consumption of vapo(u)rization system, reach energy-saving and emission-reduction and water saving object.
Summary of the invention
Technical problem to be solved by this invention overcomes existing multiple-effect evaporation concentration systems when processing yeast wastewater, the energy consumption defect that particularly steam consumption is high, provide a kind of evaporating concentrating method of yeast wastewater, adopt MVR system, decrease steam consumption, reduce cost for wastewater treatment, synthesis energy saving Be very effective.
Second technical problem to be solved by this invention is when overcoming application MVR system process yeast wastewater, a difficult problem for the easy fouling of yeast wastewater, crystallization and foaming, according to yeast wastewater characteristics design vaporization temperature and evaporation process ultimate density, ensure to reduce fouling and crystallization.
The present invention adopts MVR system to concentrate yeast wastewater, concrete, be separated and vapour compressor process through separator, obtain compressing secondary steam, then be passed into by this compression secondary steam in well heater and utilize as heat-source Cycles, often evaporating 1 ton of water only needs to consume a small amount of raw steam (such as 0.03 ton), changes existing sextuple-effect evaporation concentration systems and often evaporates the present situation that 1 ton of water at least need consume raw steam 0.18 ton, decrease steam consumption, reduce cost for wastewater treatment.
The present invention detects different concns yeast wastewater physical parameter, study that it bubbles in evaporating concentration process, fouling and crystallization rule, in surprising discovery control heater, vaporization temperature is 78-82 DEG C (preferably 80 DEG C), in yeast wastewater, solids level concentration is 10-14% (w/w) (preferably 12% (w/w)), fouling and crystallization can be reduced, eliminate its disadvantageous effect.
Present invention improves over existing MVR system, anti-foaming device is provided with between well heater discharge port and recycle pump opening for feed, well heater is run back together with the defoamer that mother liquor after separator is separated and anti-foaming device provide, can prevent yeast wastewater from bubbling in evaporating concentration process, ensure MVR device continuous and steady operation.Aforesaid operations is simple and convenient, is easy to the addition controlling defoamer.
In order to solve the problems of the technologies described above, the invention provides a kind of evaporating concentrating method of yeast wastewater, the method comprises: (1) evaporization process, yeast wastewater enters well heater 1 and heat-treats, and makes wastewater temperature be heated to 78-82 DEG C and carries out evaporating the two-phase stream obtaining comprising gas phase and liquid phase; (2) separation circuit, described two-phase stream is separated in separator 2; (3) steam compression cycle operation, then separating obtained secondary steam obtains compressing secondary steam through vapour compressor 3 process, and described compression secondary steam loops back well heater 1 thermal source recycling as a supplement; (4) mother liquor evaporization process again, returns Recycling Mother Solution separating obtained in separator 2 to well heater 1, again carries out (1) evaporization process, until solids level concentration is 10-14% (w/w) in yeast wastewater.
The evaporating concentrating method of aforesaid yeast wastewater, in (1) evaporization process, the compression secondary steam circulated with (3) steam compression cycle operation is, before thermal source thermal treatment yeast wastewater, pass into raw steam as thermal source in well heater 1.
Described raw steam refers to primary steam, namely without the steam used.
The evaporating concentrating method of aforesaid yeast wastewater, in (3) steam compression cycle operation, the temperature of described compression secondary steam is 85.5-89.5 DEG C.
The evaporating concentrating method of aforesaid yeast wastewater, in (4) mother liquor again evaporization process, described Recycling Mother Solution adds defoamer before returning well heater 1.
The evaporating concentrating method of aforesaid yeast wastewater, described defoamer is polyoxypropylene ethylene oxide glyceryl ether, and addition is add 0.5-1Kg according to yeast wastewater per ton.
The commercially available polyoxypropylene ethylene oxide glyceryl ether being conventionally used as defoamer all can be applicable to the present invention, the polyoxypropylene ethylene oxide glyceryl ether such as prepared by following method: be polymerized under potassium hydroxide catalysed and temperature 90 ~ 95 DEG C, pressure 0.4 ~ 0.5MPa by glycerine with propylene oxide, then add oxyethane to be polymerized at temperature 90 ~ 95 DEG C and pressure < 0.3MPa, hydroxyl value is 45-60.
The evaporating concentrating method of aforesaid yeast wastewater, in (4) mother liquor again evaporization process, described Recycling Mother Solution is returned in well heater 1 and is mixed with the yeast wastewater passed into continuously, is heat-treated in well heater 1 by described compression secondary steam.
The evaporating concentrating method of aforesaid yeast wastewater, in (3) steam compression cycle operation, passes into raw steam by the amount of often evaporating 1 ton of water and supplement raw steam 0.03 ton in well heater 1.
Accompanying drawing explanation
Fig. 1 yeast wastewater evaporation concentration device of the present invention
Embodiment
For fully understanding the object of the present invention, feature and effect, by following concrete embodiment, the present invention is elaborated.
The present invention adopts MVR system to carry out evaporation concentration to yeast wastewater, compression secondary steam is passed in well heater and utilizes as heat-source Cycles, often evaporate 1 ton of water only to need to consume a small amount of raw steam (such as 0.03 ton), decrease steam consumption, reduce cost for wastewater treatment.In control heater of the present invention, vaporization temperature is 78-82 DEG C (preferably 80 DEG C), in yeast wastewater, solids level concentration is 10-14% (w/w) (preferably 12% (w/w)), fouling and crystallization can be reduced, eliminate its disadvantageous effect.
The invention provides a kind of evaporating concentrating method of yeast wastewater, the method comprises: (1) evaporization process, yeast wastewater enters well heater (1) and heat-treats, and makes wastewater temperature be heated to 78-82 DEG C and carries out evaporating the two-phase stream obtaining comprising gas phase and liquid phase; (2) separation circuit, described two-phase stream is separated in separator (2); (3) steam compression cycle operation, then separating obtained secondary steam obtains compressing secondary steam through vapour compressor (3) process, and described compression secondary steam loops back well heater (1) thermal source recycling as a supplement; (4) mother liquor evaporization process again, separating obtained Recycling Mother Solution in separator (2) is returned well heater (1), again carry out (1) evaporization process, until solids level concentration is 10-14% (w/w) in yeast wastewater.
The main raw material of yeast industry is the waste molasses produced after the sugaring of sugar refinery, comprises cane molasses and beet sirup.Molasses carry out fermentative production molasses after treatment, then after separation, washing, drying, obtain yeast product.Separation after molasses process, molasses fermented rear separation, commodity fermentation, washing, drying and other steps all can produce waste water.Described yeast is industrial useful yeast, include but not limited to yeast belong (Saccharomyces), the yeast of mycocandida (Candida) and Rhodotorula (Rhodotorula), such as yeast saccharomyces cerevisiae (Saccharomycescerevisiae).
Used yeast waste water of the present invention is take waste molasses as the waste water produced in the process of main material production yeast, containing materials such as higher melanochrome, phenols and caramel; Containing the dry-matter of about 0.5% in yeast wastewater, main component is the nutritive ingredient in yeast protein, Mierocrystalline cellulose, colloidalmaterial and the waste molasses that is not fully utilized, as residual sugar etc.Yeast wastewater COD index and concentration (w/w) the standard GB8978-1996 of employing test, and complete mixed yeast wastewater index situation is in table 1.
Table 1
According to the difference of COD in yeast wastewater, be divided into high-concentration yeast wastewater and lower concentration yeast wastewater.High-concentration yeast wastewater refers to the waste water of centrifugation and filtration unit discharge in Yeast Fermentation Process, and COD is up to 80000mg/L; Lower concentration yeast wastewater refers to the waste water and the sanitary wastewater that rinse discharge in Yeast Fermentation Process, and COD is at about 1500mg/L.High-concentration yeast wastewater, lower concentration yeast wastewater and complete mixed yeast wastewater all can apply evaporating concentrating method of the present invention.
It is preferred yeast wastewater evaporation concentration device shown in Fig. 1.This device comprises well heater 1, separator 2, vapour compressor 3 and recycle pump 4; Wherein well heater 1, separator 2 is connected successively with vapour compressor 3, concrete, and the first discharge port 11 of well heater 1 connects the opening for feed of separator 2, the gas discharge mouth of separator 2 connects the inlet mouth of vapour compressor 3, and the air outlet of vapour compressor 3 connects the inlet mouth 14 of well heater 1.
The opening for feed 13 of well heater 1 and the connection line A of the second discharge port 12 are provided with recycle pump 4; The liquid outlet opening of separator 2 is connected on pipeline A by pipeline B.After carrying out gas-liquid separation in separator 2, the gas phase (secondary steam) after separation is compression secondary steam after vapour compressor 3 compresses, and entering well heater 1 as heat-source Cycles utilizes; In separator 2, separating obtained Recycling Mother Solution returns well heater 1 evaporation concentration further.
Preferably, yeast wastewater evaporation concentration device comprises anti-foaming device (not shown) further, is arranged on pipeline A.This anti-foaming device comprises the defoamer storage tank, vacuum breaker and the automatic switch valve that connect successively, automatic switch valve and recycle pump link, namely when recycle pump starts, automatic switch valve is opened, defoamer to enter in mother liquor and mixes with mother liquor under recycle pump suction function, bubbles after well heater 1 and separator 2 heating vacuumize to prevent yeast wastewater.
The present invention's well heater 1 used, separator 2, vapour compressor 3, recycle pump 4 and defoamer storage tank, vacuum breaker and automatic switch valve are conventional commercial equipment, and preferred well heater 1 is falling-film evaporator.
Below in conjunction with said apparatus, describe the technological process of yeast wastewater evaporation concentration of the present invention in detail.
Pending yeast wastewater enters in the shell and tube heating tube of well heater 1 by the opening for feed 13 of well heater 1, and material flows downward along heater heats inside pipe wall in evenly membranaceous; Entered in well heater 1 by inlet mouth 14 by the raw steam of 115-125 DEG C simultaneously, be evenly distributed on the outer wall of shell and tube heating tube, the raw steam of the yeast wastewater in heating tube and heating tube outer wall carries out heat exchange, produces the two-phase streams comprising gas phase and liquid phase.Water is condensed into after the steam heat exchange of heating tube outer wall, discharge outside well heater 1, preferably, this water of condensation enters interchanger to feed material (yeast wastewater) preheating, yeast wastewater is preheating to 50-60 DEG C, reclaim the heat in water of condensation and the temperature reducing water of condensation to meet biochemical treatment temperature requirement, discharge after then this water of condensation of biochemical treatment reaches wastewater discharge standard.
When in well heater 1, the vaporization temperature of yeast wastewater reaches 78-82 DEG C, the Partial Liquid Phase (mother liquor) in above-mentioned two-phase stream is flowed out by the second discharge port 12 of well heater 1, enters in pipeline A.Partial Liquid Phase in two-phase stream and gas phase flow out from the first discharge port 11 of well heater 1, enter in separator 2 by the opening for feed of separator 2, then in separator 2, carry out gas-liquid separation, upper strata obtains gas phase (secondary steam), and lower floor obtains concentrated mother liquor.Separator 2 upper strata gained gas phase (secondary steam) is sent in vapour compressor 3 and processes, obtain the compression secondary steam of temperature 85.5-89.5 DEG C (preferably 87.5 DEG C), described compression secondary steam loops back in well heater 1 and replaces raw steam, as the thermal source of heat exchange yeast wastewater, be evenly distributed on the outer wall of shell and tube heating tube.Raw steam is passed into from the inlet mouth 14 of well heater 1, for heat content needed for supplemental heat loss and the input and output material temperature difference by the amount of often evaporating 1 ton of water and supplement raw steam 0.03 ton.
Preferably, the vacuum system of vapour compressor 3 passes into water of condensation, rinses vapour compressor impeller, extends the work-ing life of vapour compressor 3, and to the superheated vapour cooling after compression, makes the secondary steam obtained become saturation steam.
Separator 2 lower floor obtains concentrated mother liquor and enters in pipeline A by the liquid outlet opening of separator 2, the mother liquor flowed out with well heater 1 second discharge port 12 mixes, loop back in well heater 1 by recycle pump 4 effect, mix with the yeast wastewater newly added, flow downward along heater heats inside pipe wall in evenly membranaceous.Preferably, the automatic switch valve of anti-foaming device and recycle pump link, and automatic switch valve is opened, and defoamer to enter in mother liquor and mixes with mother liquor under recycle pump suction function, and the Recycling Mother Solution after then adding defoamer is returned in well heater 1.The present invention's defoamer used is polyoxypropylene ethylene oxide glyceryl ether, and addition is according to newly adding yeast wastewater interpolation per ton 0.5-1Kg.
The yeast wastewater of heating tube inwall and the raw steam of heating tube outer wall carry out heat exchange, produce the two-phase streams comprising gas phase and liquid phase.Be condensed into water after the steam heat exchange of heating tube outer wall, discharge outside well heater 1.When in well heater 1, the vaporization temperature of yeast wastewater reaches 78-82 DEG C (preferably 80 DEG C), the Partial Liquid Phase (mother liquor) in above-mentioned two-phase stream is flowed out by the second discharge port 12 of well heater 1, enters in pipeline A.Partial Liquid Phase in two-phase stream and gas phase flow out from the first discharge port 11 of well heater 1 and enter separator 2, repeat above-mentioned separator 2 and be separated gas phase and mother liquor, vapour compressor 3 processed compressed obtains the process compressing secondary steam, loop compression secondary steam and mother liquor.
When solids level concentration in yeast wastewater reaches 10-14% (w/w) (preferably 12% (w/w)), open yeast wastewater discharging control valve 5, yeast wastewater will be concentrated and discharge.Now MVR plant running is stablized, and closes automatic switch valve, stops adding defoamer.Adopt yeast wastewater evaporating concentrating method of the present invention, MVR device can continue utilization more than 10 days, even reaches 17 days.
Because in yeast wastewater, COD concentration is high, containing organic substances such as the abundant inorganic trace such as nitrogen, phosphorus, potassium, calcium, iron and element humic acids, xanthohumic acids, biodegradability energy extreme difference, very easily fouling and crystallization in evaporating concentration process.The present inventor is found by research, reduce vaporization temperature, when material evaporation concentrates, its crystallization trend is obviously strengthened, and improves vaporization temperature, when material evaporation concentrates, its scaling tendency is obviously strengthened, and the formation of crystallization and fouling is all unfavorable for the steady running of evaporation concentration process of the present invention; In addition, in yeast wastewater, solids level concentration is more than 15% after (w/w), and well heater 1 fouling is significantly accelerated, and is unfavorable for the steady running of vapo(u)rization system long period.Therefore the present invention is after large quantity research, in order to reduce crystallization and fouling, the vaporization temperature selecting yeast wastewater in well heater 1 is 78-82 DEG C (preferably 80 DEG C), in yeast wastewater, solids level concentration is 10-14% (w/w) (preferably 12% (w/w)), balance and reduce crystallization and the relation reducing fouling, at utmost utilize device processes ability, MVR system energy continuous and steady operation more than 10 days, even reaches more than 17 days.
The present invention adopts MVR system to carry out evaporation concentration to yeast wastewater, and compression secondary steam is passed in well heater and utilizes as heat-source Cycles, and often evaporating 1 ton of water only needs to consume a small amount of raw steam, decreases steam consumption, reduces cost for wastewater treatment.
Yeast wastewater after process of the present invention can adopt conventional multiple effect evaporation concentration to 55-60% (W/W) further, then adopts spray drying device to manufacture fertilizer, feed etc.Such as disclosed in CN102060341CN, adopting 2-6 single-effect evaporator, take ammonium sulfate as catalyzer, pH value controls at 3.0-7.0, and thickening temperature controls at 20-90 DEG C, most preferably 50-65 DEG C, crystalline inorganic salt, is then used as fodder additives or organic fertilizer after super-dry.
Set forth the enforcement of method of the present invention below by specific embodiment, one skilled in the art will appreciate that this should not be understood to the restriction to the claims in the present invention scope.
Embodiment
Following examples equipment used sees the following form.
| Device name | Producer's title | Model |
| Well heater | Yixing Grant | φ3*24m，S＝3500m 2 |
| Separator | Yixing Grant | φ4.5*7.2m |
| Vapour compressor | Germany Piller | 50770KKXGAE 80900 |
Embodiment 1
Adopt beet molasses as fermenting raw materials yeast saccharomyces cerevisiae, the yeast wastewater produced in yeast separation process by yeast is as the evaporation concentration object of the present embodiment.The COD of this yeast wastewater is 5000mg/L, and in waste water, solids level concentration is 4% ± 1% (W/W), and is preheating to 60 DEG C.
Yeast wastewater is with 65m
3the flow of/h enters in the shell and tube heating tube of well heater 1 by the opening for feed 13 of well heater 1, and material flows downward along heater heats inside pipe wall in evenly membranaceous; Entered in well heater 1 by inlet mouth 14 by the raw steam of 115-125 DEG C simultaneously, be evenly distributed on the outer wall of shell and tube heating tube, the raw steam of the yeast wastewater in heating tube and heating tube outer wall carries out heat exchange, produces the two-phase streams comprising gas phase and liquid phase.Be condensed into water after the steam heat exchange of heating tube outer wall, discharge outside well heater 1.
When the vaporization temperature that the temperature sensor of well heater 1 bottom records middle yeast wastewater reaches 80 DEG C (pressure is 474mbar (absolute pressure)), Partial Liquid Phase (mother liquor) in above-mentioned two-phase stream is flowed out by the second discharge port 12 of well heater 1, enters in pipeline A.Partial Liquid Phase in two-phase stream and gas phase flow out from the first discharge port 11 of well heater 1, enter in separator 2 by the opening for feed of separator 2, then in separator 2, carry out gas-liquid separation, upper strata obtains gas phase (secondary steam), and lower floor obtains concentrated mother liquor.Sent in vapour compressor 3 on separator 2 upper strata gained gas phase (secondary steam) and process, obtain the compression secondary steam of temperature 87.5 DEG C, described compression secondary steam loops back in well heater 1, and is evenly distributed on the outer wall of shell and tube heating tube.Raw steam is passed into from the inlet mouth 14 of well heater 1, for heat content needed for supplemental heat loss and the input and output material temperature difference by the amount of often evaporating 1 ton of water and supplement raw steam 0.03 ton.
The concentrated mother liquor that separator 2 lower floor obtains enters in pipeline A by the liquid outlet opening of separator 2, and the mother liquor flowed out with well heater 1 second discharge port 12 mixes, with 600m
3the flow of/h is acted on by recycle pump 4 and loops back well heater 1 from opening for feed 13, simultaneously the automatic switch valve of anti-foaming device and recycle pump link, automatic switch valve is opened, defoamer polyoxypropylene ethylene oxide glyceryl ether to add in mother liquor according to the addition newly adding yeast wastewater interpolation per ton 0.5-1Kg and to mix with mother liquor under recycle pump suction function, loop back in well heater 1 together, then with newly add with 65m
3the yeast wastewater mixing of/h flow, flows downward along heater heats inside pipe wall in evenly membranaceous.
The yeast wastewater of heating tube inwall and the raw steam of heating tube outer wall carry out heat exchange, produce the two-phase streams comprising gas phase and liquid phase.Be condensed into water after the steam heat exchange of heating tube outer wall, discharge outside well heater 1.When in well heater 1, the vaporization temperature of yeast wastewater reaches 80 DEG C, the Partial Liquid Phase (mother liquor) in above-mentioned two-phase stream is flowed out by the second discharge port 12 of well heater 1, enters in pipeline A.Partial Liquid Phase in two-phase stream and gas phase flow out from the first discharge port 11 of well heater 1 and enter separator 2, repeat above-mentioned separator 2 and be separated gas phase (secondary steam) and mother liquor, vapour compressor 3 processed compressed obtains the process compressing secondary steam, loop compression secondary steam and mother liquor.
When the solids level concentration that yeast wastewater finally processes reaches 12% (w/w), open yeast wastewater discharging control valve 5, concentrated yeast wastewater solids level concentration being reached 12% (w/w) is discharged.Now MVR plant running is stablized, and closes automatic switch valve, stops adding defoamer.
Adopt the MVR device of embodiment 1 processing method can continue utilization 15 days, run MVR device after 15 days out of service, find to occur fouling about 5mm in well heater 1, do not produce crystallization.Adopt acid solution and caustic dip well heater 1 after totally 15 hours MVR device restart again.
Embodiment 2
The technique that the present embodiment adopts is basic identical with embodiment 1, and difference is: the temperature of compression secondary steam is 85.5 DEG C; In well heater 1, the vaporization temperature of yeast wastewater is 78 DEG C; The solids level concentration that yeast wastewater finally processes is 10% (w/w).Adopt the MVR device of embodiment 2 processing method can continue utilization 17 days, in well heater 1, fouling thickness is only about 5mm, does not produce crystallization.
Embodiment 3
The technique that the present embodiment adopts is basic identical with embodiment 1, and difference is: the temperature of compression secondary steam is 85.5 DEG C; In well heater 1, the vaporization temperature of yeast wastewater is 78 DEG C; The solids level concentration that yeast wastewater finally processes is 12% (w/w).Adopt the MVR device of embodiment 3 processing method can continue utilization 16 days, in well heater 1, fouling thickness is only about 5mm, produces a small amount of crystallization.Embodiment 3 and embodiment 1 comparative illustration, maintain discharge concentration constant, and the trend reducing the crystallization of vaporization temperature material strengthens.
Embodiment 4
The technique that the present embodiment adopts is basic identical with embodiment 1, and difference is: the temperature of compression secondary steam is 89.5 DEG C; In well heater 1, the vaporization temperature of yeast wastewater is 82 DEG C; The solids level concentration that yeast wastewater finally processes is 14% (w/w).
Adopt the MVR device of embodiment 4 processing method can continue utilization 11 days, in well heater 1, fouling thickness is only about 6mm.
Comparative example 1
The technique that the present embodiment adopts is basic identical with embodiment 1, and difference is: the temperature of compression secondary steam is 93.5 DEG C; In well heater 1, the vaporization temperature of yeast wastewater is 85 DEG C; The solids level concentration that yeast wastewater finally processes is 16% (w/w).
Adopt the MVR device of the present embodiment processing method can continue utilization 3 days, in well heater 1, fouling is serious, and thickness can reach about 5mm.
Comparative example 2
The technique that the present embodiment adopts is basic identical with embodiment 1, and difference is: the temperature of compression secondary steam is 82.5 DEG C; In well heater 1, the vaporization temperature of yeast wastewater is 75 DEG C; The solids level concentration that yeast wastewater finally processes is 12% (w/w).
Adopt the MVR device of the present embodiment processing method can continue utilization 4 days, well heater 1 intercrystalline is serious, and thickness can reach about 4mm.
As can be seen from embodiment 1-4, MVR system is adopted to carry out evaporation concentration to yeast wastewater, the vaporization temperature selecting yeast wastewater in well heater 1 is 78-82 DEG C (preferably 80 DEG C), the final concentration for the treatment of of yeast wastewater is 10-14% (w/w) (preferably 12% (w/w)), balance and reduce crystallization and the relation reducing fouling, at utmost utilize device processes ability, MVR device can continue utilization more than 10 days.
The present invention adopts MVR system to concentrate yeast wastewater, this secondary steam is passed in well heater and utilizes as heat-source Cycles, often evaporate 1 ton of water only to need to consume a small amount of raw steam (such as 0.03 ton), change existing sextuple-effect evaporation concentration systems and often evaporate the present situation that 1 ton of water at least need consume raw steam 0.18 ton, decrease steam consumption, reduce cost for wastewater treatment.
Yeast wastewater after the present invention concentrates can adopt multiple-effect evaporation concentration systems to be concentrated to 60% (W/W) left and right further, then adopts the method such as conventional centrifugal, spraying dry to obtain fodder additives or organic fertilizer.
Claims (7)
1. an evaporating concentrating method for yeast wastewater, the method comprises:
(1) evaporization process, yeast wastewater enters well heater (1) and heat-treats, and makes wastewater temperature be heated to 78-82 DEG C and carries out evaporating the two-phase stream obtaining comprising gas phase and liquid phase;
(2) separation circuit, described two-phase stream is separated in separator (2);
(3) steam compression cycle operation, then separating obtained secondary steam obtains compressing secondary steam through vapour compressor (3) process, and described compression secondary steam loops back well heater (1) thermal source recycling as a supplement;
(4) mother liquor evaporization process again, separating obtained Recycling Mother Solution in separator (2) is returned well heater (1), again carry out (1) evaporization process, until solids level concentration is 10-14% (w/w) in yeast wastewater;
The COD value of described yeast wastewater is 1500mg/L to 80000mg/L.
2. the evaporating concentrating method of yeast wastewater according to claim 1, it is characterized in that, in (1) evaporization process, the compression secondary steam circulated with (3) steam compression cycle operation is, before supplemental heat source thermal treatment yeast wastewater, pass into raw steam as thermal source in well heater (1).
3. the evaporating concentrating method of yeast wastewater according to claim 1 and 2, is characterized in that, in (3) steam compression cycle operation, the temperature of described compression secondary steam is 85.5-89.5 DEG C.
4. the evaporating concentrating method of yeast wastewater according to claim 1 and 2, is characterized in that, in (4) mother liquor again evaporization process, described Recycling Mother Solution returns that well heater (1) is front adds defoamer.
5. the evaporating concentrating method of yeast wastewater according to claim 4, is characterized in that, described defoamer is polyoxypropylene ethylene oxide glyceryl ether, and addition is add 0.5-1Kg according to yeast wastewater per ton.
6. the evaporating concentrating method of yeast wastewater according to claim 1, it is characterized in that, in (4) mother liquor again evaporization process, described Recycling Mother Solution is returned in well heater (1) and is mixed with the yeast wastewater passed into continuously, is heat-treated in well heater (1) by described compression secondary steam.
7. the evaporating concentrating method of yeast wastewater according to claim 1, is characterized in that, in (3) steam compression cycle operation, passes into raw steam by the amount of often evaporating 1 ton of water and supplement raw steam 0.03 ton in well heater (1).
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| CN104787823B (en) * | 2015-04-17 | 2017-03-15 | 黑龙江鑫达晟机械科技有限公司 | Yeast wastewater Zero discharge treatment method |
| CN109205716A (en) * | 2017-10-16 | 2019-01-15 | 广州中科鑫洲科技有限公司 | Concentrate and application after a kind of fermentation waste water MVPC processing method and processing |
| CN110639220B (en) * | 2019-10-31 | 2021-10-26 | 湖南汉华京电清洁能源科技有限公司 | Multi-effect evaporation system with pressure adjusting device and pressure adjusting method |
| CN114057339B (en) * | 2020-08-05 | 2023-04-07 | 安琪酵母股份有限公司 | Method for recycling selenium source in selenium-enriched yeast fermentation process and treatment system of selenium-containing wastewater |
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