CN102863071A - Advanced treatment method for decolorizing yeast wastewater - Google Patents
Advanced treatment method for decolorizing yeast wastewater Download PDFInfo
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- CN102863071A CN102863071A CN2012104076119A CN201210407611A CN102863071A CN 102863071 A CN102863071 A CN 102863071A CN 2012104076119 A CN2012104076119 A CN 2012104076119A CN 201210407611 A CN201210407611 A CN 201210407611A CN 102863071 A CN102863071 A CN 102863071A
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Abstract
The invention discloses an advanced treatment method for decolorizing yeast wastewater. The specific method includes that ozone aeration treatment is used, and effects of catalysts are combined, so that the discharge water chroma can be better than discharge requirements (50 times) in discharge standard of water pollutants for yeast industry GB 2546-2010, and the ozone adding amount is effectively reduced simultaneously. By means of the advanced treatment method for decolorizing yeast wastewater, current situations that wastewater advanced treatment systems in yeast industries depend on a chemical precipitation method to remove chroma are changed, and problems of large chemical sludge amount, high treatment cost and difficulties for chroma to reach the standard are solved; and the advanced treatment method for decolorizing yeast wastewater is high in process operability and applicable to engineering renovation projects and novel projects which are performed by domestic yeast enterprises about decolorizing issues.
Description
Technical field
The invention belongs to the waste water decoloring process field, particularly go out the advanced treatment decoloring method of system water for yeast wastewater biochemistry.
Background technology
Colourity in the yeast wastewater is progressively to produce accumulation by the colourity in the waste molasses in sugaring and yeast fermentation process to form, mainly contain the compositions such as phenolic material and amino nitrogen compound, polyphenols is oxidized to brown pigments under the effect of enzyme, reducing sugar alkali decomposes institute's synthetic macromolecule pheomelanins, reducing sugar and amino acid reaction generate the brown polymkeric substance, the sugar thermolysis becomes the caramel colorant of dark brown, phenolic material and iron reaction generate the pigment of comprehensive above-mentioned each materials such as compound of dark color, yeast wastewater is brownish black, and colourity reaches about 6400 times.
In the process of biological treatment yeast wastewater, find, anaerobic process are better to the removal effect of chroma in waste water, water inlet colourity is about 3200 times, anaerobic effluent generally can reach 480-600 doubly, chroma removal rate is more than 81%, but colourity increases on the contrary to some extent after aerobic treatment, outputted aerobic water colourity is generally 640-800 doubly, this is that the colour developing group of part polyphenolic compound is reduced, but is not decomposed into small molecules fully because at anaerobic stages, temporarily do not develop the color, at aerobic stage, after these colour developing groups are oxidized, the colour developing group before recovering again, again present color, this type of polyphenolic substance is biological hard-degraded substance, is difficult to thoroughly decompose in the biosystem treating processes remove, and finally discharges from biosystem with outputted aerobic water.
The method of yeast wastewater advanced treatment mainly is chemical method at present, utilize the flocculation agent processing of decolouring, chroma removal rate is 75% to the maximum, simultaneously because the disposal of the adding of chemical agent, chemical sludge, working cost significantly increases, and has brought adverse influence for the development of yeast enterprise, thereby, how can effectively remove the colourity in the yeast wastewater, reduce simultaneously the cost of decolouring, become the major issue that the yeast wastewater advanced treatment need to solve.
Summary of the invention
The invention provides a kind of method of yeast wastewater advanced treatment decolouring, adopt the method for heterogeneous catalysis ozonize, effectively remove the colourity in the waste water, at utmost reduce ozone dosage simultaneously.
A kind of yeast wastewater degree of depth decoloration treatment method provided by the invention, adopt following technical scheme:
The former water of yeast wastewater is the biochemical system water outlet, colourity is in 500 times to 800 times scopes, under the acting in conjunction of ozone and catalyzer, the former water of this yeast wastewater is carried out the heterogeneous catalysis ozonization, ozone dosage is below 50mg/L, reaction time is 30 minutes, and effluent color dilution can reach below 50 times.Described catalyzer is solid catalyst, this solid catalyst comprises Manganse Dioxide, aluminum oxide and cupric oxide, wherein the weight ratio of Manganse Dioxide, aluminum oxide and cupric oxide is 0.8-1.2:0.7-0.9:0.27-0.33, the particle diameter of Manganse Dioxide, aluminum oxide and cupric oxide is 4-8mm, and solid catalyst is the fixed bed form in reactor, and catalyzer adds and highly is 2.5-3m.
Preferably, the air water approach axis is reverse in the reactor, and ozone gas enters reactor from the bottom, and the former water of yeast wastewater enters reactor from the top.
Preferably, to water inlet, the backflow ratio is 1-1.5 times of flooding quantity with the reactor effluent recycling.
Catalyst fixed bed along with continuous operation, can trap water in suspended substance, can form a skim at catalyst surface, affect catalytic effect, so, need to carry out regular back flushing to catalyst fixed bed.Backwash water be Process for Effluent or tap water all can, enter from reactor bottom, flow out on top; The back flushing air inlet is air, enters from reactor bottom, discharges from reactor top.Preferably, catalyst fixed bed backwashing period is 24 to 48 hours, and backwashing time is 20 to 30 minutes.
The chief component composition of colourity has caramel colorant, Mei Lade pigment and Polyphenols pigment in the yeast wastewater, and these pigments can't be decomposed by microorganism, so the colourity of waste water is still very high after the routine biological treatment.The dependence of conventional depth treatment process adds coagulated agent and precipitates COD and colourity in the removal waste water, but a large amount of use of coagulated agent is limited to the removal effect of colourity, thereby cause secondary pollution but also can produce a large amount of chemical sludges, also improved the cost of wastewater treatment.
Itself has strong oxidizing property ozone, can be used for the removal of colourity, but yeast wastewater colourity is high, directly uses ozone dosage bigger than normal, and the ozone cost of manufacture is high, directly uses the ozone processing cost of decolouring too high.Produce hydroxyl radical free radical and other free groups of having in a large number strong oxidizing property under the effect of catalyzer, deoxidation causes the organism of colourity.The present invention adopts with the solid catalyst that comprise Manganse Dioxide, aluminum oxide and cupric oxide of specified weight than configuration, and its catalytic efficiency to ozonization is high, has significantly reduced ozone dosage, makes simultaneously effluent color dilution satisfy emission request.Because the catalyzer type of service is fixed filter bed, rejection effect is obvious, the suspended substance in can the former water of effectively catching, thus effectively avoided suspended substance catalysis ozone to be produced the disadvantageous effect of the chain reaction of hydroxyl radical free radical.Reactor adopt the form of gas-water counterflow also can effectively avoid since air water in the same way, upflow velocity is too fast causes the expansion of catalyzer filter bed to cause the filter bed crown_interception to descend, to the disadvantageous effect of generation hydroxyl radical free radical.Simultaneously, use solid catalyst to make filter bed, can be so that solid-liquid separation.
Description of drawings
Fig. 1 is yeast wastewater catalytic ozonation decoloration treatment method schematic diagram.
Embodiment
In order to make the technical scheme described in the present invention more be convenient to understand, below in conjunction with embodiment yeast wastewater advanced treatment decoloring method of the present invention is further elaborated.
Embodiment 1
The former water of yeast wastewater is the biochemical system water outlet of certain yeast factory of the north, colourity is in 500 times to 800 times scopes, under the acting in conjunction of ozone and catalyzer, the former water of this yeast wastewater is carried out the heterogeneous catalysis ozonization, ozone dosage is below 50mg/L, reaction time is 30 minutes, and effluent color dilution can reach below 50 times.Described catalyzer is solid catalyst, this solid catalyst comprises Manganse Dioxide, aluminum oxide and cupric oxide, the weight ratio of Manganse Dioxide, aluminum oxide and cupric oxide is 0.8-1.2:0.7-0.9:0.27-0.33, wherein the particle diameter of Manganse Dioxide, aluminum oxide and cupric oxide is 4-8mm, and solid catalyst is the fixed bed form in reactor, and catalyzer adds and highly is 2.5-3m.
The air water approach axis is reverse in the reactor, and ozone gas enters reactor from the bottom, and the former water of yeast wastewater enters reactor from the top.Catalyst fixed bed backwashing period is 24 to 48 hours, and backwashing time is 20 to 30 minutes.
Table 1 is the intermittent type Decolorant Test result of the biochemical system water outlet of certain yeast factory of the north, can find out with direct ozone oxidation and compare, adopt the method for catalytic ozonation that the usage quantity of ozone is obviously reduced, and effluent color dilution has significant lifting, can stablize and reach 50 times requirement.
Table 1
Embodiment 2
The former water of yeast wastewater is the biochemical system water outlet of certain yeast factory of the north, colourity is in 500 times to 800 times scopes, under the acting in conjunction of ozone and catalyzer, the former water of this yeast wastewater is carried out the heterogeneous catalysis ozonization, ozone dosage is below 50mg/L, reaction time is 30 minutes, and effluent color dilution can reach below 50 times.Described catalyzer is solid catalyst, this solid catalyst comprises Manganse Dioxide, aluminum oxide and cupric oxide, the weight ratio of Manganse Dioxide, aluminum oxide and cupric oxide is 0.8-1.2:0.7-0.9:0.27-0.33, wherein the particle diameter of Manganse Dioxide, aluminum oxide and cupric oxide is 4-8mm, and solid catalyst is the fixed bed form in reactor, and catalyzer adds and highly is 2.5-3m.
The air water approach axis is reverse in the reactor, and ozone gas enters reactor from the bottom, and the former water of yeast wastewater enters reactor from the top.Catalyst fixed bed backwashing period is 24 to 48 hours, and backwashing time is 20 to 30 minutes.
Table 2 is the continuous stripping test-results of biochemical system water outlet of certain yeast factory of the north, can find out with direct ozone oxidation and compare, and the dosage of ozone is controlled at the 50mg/L level, and effluent color dilution can be stablized and reaches 50 times requirement.
Table 2
When continuous stripping was tested, ozone dosage was fixed, and every day, water sampling was measured colourity, and every day, to catalyst fixed bed back flushing once flushing cycle was 20 minutes simultaneously.
Claims (4)
1. yeast wastewater advanced treatment decoloring method, it is characterized in that: the former water of yeast wastewater is the biochemical system water outlet, colourity is in 500 times to 800 times scopes, under the acting in conjunction of ozone and catalyzer, the former water of this yeast wastewater is carried out the heterogeneous catalysis ozonization, ozone dosage is below 50mg/L, and reaction time is 30 minutes, and effluent color dilution can reach below 50 times; Described catalyzer is solid catalyst, this solid catalyst comprises Manganse Dioxide, aluminum oxide and cupric oxide, wherein the weight ratio of Manganse Dioxide, aluminum oxide and cupric oxide is 0.8-1.2:0.7-0.9:0.27-0.33, the particle diameter of Manganse Dioxide, aluminum oxide and cupric oxide is 4-8mm, and solid catalyst is the fixed bed form in reactor, and catalyzer adds and highly is 2.5-3m.
2. a kind of yeast wastewater advanced treatment decoloring method according to claim 1 is characterized in that, the air water approach axis is reverse in the reactor, and ozone gas enters reactor from reactor bottom, and the former water of yeast wastewater enters reactor from reactor head.
3. a kind of yeast wastewater advanced treatment decoloring method according to claim 2 is characterized in that, catalyst fixed bed backwashing period is 24 to 48 hours, and backwashing time is 20 to 30 minutes.
4. a kind of yeast wastewater advanced treatment decoloring method according to claim 1 is characterized in that, to water inlet, the backflow ratio is 1-1.5 times of flooding quantity with the reactor effluent recycling.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105419939A (en) * | 2014-09-10 | 2016-03-23 | 浙江医药股份有限公司新昌制药厂 | Fixed bed decolorization process of polyunsaturated fatty acid |
| CN105668881A (en) * | 2016-03-16 | 2016-06-15 | 湖南京明环保科技有限公司 | Wastewater treatment system containing ammonia nitrogen |
| CN108821421A (en) * | 2018-06-27 | 2018-11-16 | 丰城恒泰食品有限公司 | A kind of biodegrading process of burnt sugar coloring |
| CN109939695A (en) * | 2019-04-03 | 2019-06-28 | 宁夏大学 | A kind of support type O3The preparation of catalyst and its application in coal chemical industry high-salt wastewater COD removal |
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| JPH10128350A (en) * | 1996-10-25 | 1998-05-19 | Nippon Shokubai Co Ltd | Method for treating wastewater containing coloring matter |
| CN101428924A (en) * | 2008-12-09 | 2009-05-13 | 江苏工业学院 | Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means |
| CN101450828A (en) * | 2008-11-25 | 2009-06-10 | 江苏工业学院 | Method for processing VC wastewater by catalytic ozonation |
| CN102001773A (en) * | 2010-12-17 | 2011-04-06 | 黑龙江大学 | Water treatment method combining ozone catalytic oxidation with ultra-filtration membrane |
| CN102491581A (en) * | 2011-11-14 | 2012-06-13 | 中国海洋石油总公司 | Advanced treatment method for production waste water of acrylic acid and ester device |
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2012
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Patent Citations (5)
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| JPH10128350A (en) * | 1996-10-25 | 1998-05-19 | Nippon Shokubai Co Ltd | Method for treating wastewater containing coloring matter |
| CN101450828A (en) * | 2008-11-25 | 2009-06-10 | 江苏工业学院 | Method for processing VC wastewater by catalytic ozonation |
| CN101428924A (en) * | 2008-12-09 | 2009-05-13 | 江苏工业学院 | Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105419939A (en) * | 2014-09-10 | 2016-03-23 | 浙江医药股份有限公司新昌制药厂 | Fixed bed decolorization process of polyunsaturated fatty acid |
| CN105668881A (en) * | 2016-03-16 | 2016-06-15 | 湖南京明环保科技有限公司 | Wastewater treatment system containing ammonia nitrogen |
| CN105668881B (en) * | 2016-03-16 | 2018-07-27 | 湖南京明环保科技有限公司 | Wastewater treatment system containing ammonia nitrogen |
| CN108821421A (en) * | 2018-06-27 | 2018-11-16 | 丰城恒泰食品有限公司 | A kind of biodegrading process of burnt sugar coloring |
| CN108821421B (en) * | 2018-06-27 | 2021-06-29 | 丰城恒泰食品有限公司 | Degradation method of caramel color |
| CN109939695A (en) * | 2019-04-03 | 2019-06-28 | 宁夏大学 | A kind of support type O3The preparation of catalyst and its application in coal chemical industry high-salt wastewater COD removal |
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