CN100572296C - A kind of method of yeast wastewater advanced treatment - Google Patents
A kind of method of yeast wastewater advanced treatment Download PDFInfo
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- CN100572296C CN100572296C CNB2007100535980A CN200710053598A CN100572296C CN 100572296 C CN100572296 C CN 100572296C CN B2007100535980 A CNB2007100535980 A CN B2007100535980A CN 200710053598 A CN200710053598 A CN 200710053598A CN 100572296 C CN100572296 C CN 100572296C
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Abstract
The present invention relates to a kind of method of yeast wastewater advanced treatment.A kind of method of yeast wastewater advanced treatment is characterized in that it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent after biochemical treatment, stirs fast, and the mixing speed of whipping process is 300～600rpm fast; Described inorganic flocculating agent is a molysite, and the add-on of inorganic flocculating agent is pressed: add 11～15mmol Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+Add organic floculant then, stir, organic floculant is a cationic-type polyacrylamide, the organic floculant that adds 2～10mg in every liter of yeast wastewater bio-chemical effluent, enter settling pond after the stirring and carry out solid-liquid separation, settling of floccus, supernatant liquor is further removed COD and colourity by activated carbon adsorption.The present invention has COD and the high characteristics of chroma removal rate.
Description
Technical field
The present invention relates to a kind of method of yeast wastewater advanced treatment.
Background technology
Yeast wastewater is to make a kind of trade effluent that the yeast process produces through zymotechnique, fermented liquid centrifugation drying.The characteristics of yeast wastewater are that waste water is brownish black, the organic concentration height: isolating yeast wastewater from the yeast liquid fermentation tank, COD is up to 50000～100000mg/L.
Yeast wastewater is generally handled (Benito by traditional aerobic/anaerobic biochemical method, G.G. (1997) Decolorization of wastewater from an alcoholic fermentation process with trametesversicolor.Bioresource Technology, 61:33-37.).Yet, the biochemical treatment yeast wastewater that obtains behind the biochemical processing process (or claiming the yeast wastewater bio-chemical effluent) exists not enough: 1, yeast wastewater is through after traditional biochemical treatment, because pigment (melanoid) is difficult to be degraded by microorganisms in the waste water, the water outlet color is very dark; 2, COD concentration is higher.
The biochemical treatment yeast wastewater (being the yeast wastewater bio-chemical effluent) that obtains after the domestic and international at present yeast wastewater biochemical treatment to the generation of yeast production process carries out advanced treatment process (being the yeast wastewater advanced treatment process) and comprises methods such as physics, chemistry and microorganism.The physics method mostly is the process combination of ultrafiltration (UF) or ultrafiltration and nanofiltration (NF) based on membrane technology.Chemical method mainly is a chemical oxidization method, comprises ozone oxidation, Fenton reagent (hydrogen peroxide mixes with certain proportion with ferrous sulfate) oxidation, supercritical oxidation, electrochemical oxidation process etc.Part special bacteria, especially fungi have complicated enzyme system as white-rot fungi, under the condition that nutrition is restricted, and the melanoid of can degrading.The Mycophyta bacterial strain is used to the advanced treatment of yeast wastewater as aspergillusniger, Flavodon falvus, Pseudomonas fluorescens etc.
(chemical oxygen demand (COD), COD is meant that under certain condition the amount of the oxygenant that consumes is represented with the mg/litre of oxygen when handling water sample with strong oxidizer to membrane treatment process to waste water COD.It is the important indicator of reducing substance in the tolerance waste water.) and chroma removal rate respectively more than 80% and 90%, but investment cost and running cost are higher, and are easy to generate concentration polarization and membrane pollution problem.Chemical oxidization method has only 20～50% to the COD clearance mostly, also may produce other deleterious intermediate product in the reaction process.Supercritical oxidation process is organism in the degrading waste water fully almost, but investment is too high with working cost.Generally between 60～80%, effect is on the low side, and is subjected to the influence of environmental factors (as temperature, pH value and nutrition etc.) bigger, the decolorizing effect instability to the percent of decolourization of yeast wastewater for microorganism.
Because melanoid has oxidation resistant characteristics in the yeast wastewater, intractability is very big.At present, in the domestic production zymic producer almost there be not the real example up to standard of yeast wastewater processing.Current improvement to yeast wastewater lags behind the development of industry, has had influence on enterprise, even is restricting the sustainable development of whole industry.
Summary of the invention
The object of the present invention is to provide the method for the high yeast wastewater advanced treatment of a kind of COD and chroma removal rate.
To achieve these goals, technical scheme of the present invention is: a kind of method of yeast wastewater advanced treatment, it is characterized in that it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent after biochemical treatment, stir fast, the mixing speed of whipping process is 300～600rpm fast; Described inorganic flocculating agent is aluminium salt or molysite, and the add-on of inorganic flocculating agent is pressed: add 11～15mM (mmole) Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+Or Al
3+Add organic floculant then, stir, organic floculant is cationic-type polyacrylamide (using as coagulant aids), the organic floculant that adds 2～10mg in every liter of yeast wastewater bio-chemical effluent, enter settling pond after the stirring and carry out solid-liquid separation, settling of floccus, supernatant liquor (or claiming clear liquor) directly discharges or further removes COD and colourity by activated carbon adsorption.
Described supernatant liquor is to carry out under pH value＜7, temperature are 15～65 ℃ condition by charcoal absorption, must purify waste water; When gac is powder, whenever go up the required Powdered Activated Carbon consumption of clear liquid greater than 1g; When gac is particle, whenever go up the required granulated active carbon consumption of clear liquid greater than 10g.
When inorganic flocculating agent was molysite, the add-on of molysite control pH value scope was 4～5; Inorganic flocculating agent is when hanging down molecule aluminium salt, and add-on control flocculation water outlet (being supernatant liquor) the pH value scope of aluminium salt is 5～6; When inorganic flocculating agent was high molecular polymerize aluminum chloride, add-on control flocculation water outlet pH value scope was 5～7.
Described aluminium salt is Tai-Ace S 150, aluminum chloride or high molecular polymerize aluminum chloride.
Described molysite is iron(ic) chloride, ferric sulfate, iron nitrate or high molecular bodied ferric sulfate.
Described inorganic flocculating agent is iron(ic) chloride or iron nitrate, and when perhaps inorganic flocculating agent was aluminum chloride or aluminum nitrate, the add-on of inorganic flocculating agent was pressed: add 11～14mM (mmole) Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+Or Al
3+When described inorganic flocculating agent was Tai-Ace S 150, ferric sulfate or bodied ferric sulfate, the add-on of inorganic flocculating agent was pressed: add 12～15mM (mmole) Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+Or Al
3+When inorganic flocculating agent was polymerize aluminum chloride, the add-on of inorganic flocculating agent was pressed: add 4～7g polymerize aluminum chloride in the yeast wastewater bio-chemical effluent of every 1gCOD.
The invention has the beneficial effects as follows:
(1) adds inorganic flocculating agent in the employing yeast wastewater bio-chemical effluent, adopt inorganic flocculating agent consumption of the present invention, can improve COD and chroma removal rate effectively.With iron(ic) chloride and iron nitrate is flocculation agent, and more than 85% and 95%, outlet water organic substance concentration is lower than 200mg/L substantially respectively for COD and chroma removal rate.Ferric sulfate, aluminum chloride and polymerize aluminum chloride to COD and chroma removal rate respectively more than 75% and 90%.Tai-Ace S 150 to COD and chroma removal rate respectively more than 65% and 85%.
(2) successively add inorganic flocculating agent and organic floculant in the yeast wastewater bio-chemical effluent, organic floculant---cationic-type polyacrylamide is united use as coagulant aids and inorganic flocculating agent, can significantly reduce sedimentation time, and sludge volume also obviously reduces.
(3) add inorganic flocculating agent in the yeast wastewater bio-chemical effluent, the employing mixing speed is 300～600rpm, the effectively sedimentation of flco that flocculation produces.Stir speed (S.S.) is low, causes producing the flco rising phenomenon; Stirring intensity is excessive, makes the flco fragmentation easily, all influences effluent quality.
(4) the inorganic flocculating agent consumption is directly proportional with organic concentration.When yeast wastewater bio-chemical effluent water quality is undergone mutation, can adjust the flocculation agent consumption according to the stoichiometric relation between flocculation agent consumption and organic concentration, avoid flocculation agent to descend with quantity not sufficient or the excessive flocculating effect that causes.
(5) charcoal absorption and flocculation process coupling, the outlet water organic substance clearance reaches more than 95%, and color removes fully.Outlet water organic substance concentration after the charcoal absorption is lower than 50mg/L, can be back to produce or other link.
The present invention is applicable to the yeast wastewater bio-chemical effluent after the yeast wastewater of yeast production process generation carries out biochemical treatment, has general applicability.Among the present invention, the effluent quality after Tai-Ace S 150 is handled satisfies the composite wastewater three class emission standards that present yeast industry is carried out, and the effluent quality after other inorganic flocculating agent is handled is far superior to composite wastewater three class emission standards.Medicament of the present invention and running cost are lower; With active carbon absorption technology associating, final outflow water can reuse, reduces the water of productive use water yield, and the conserve water resource has broad application prospects.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---iron(ic) chloride, the COD concentration of yeast wastewater bio-chemical effluent is 1000mg/L, adds 3.5g (12.95mM Fe in every liter of yeast wastewater bio-chemical effluent
3+) iron(ic) chloride, earlier the rotating speed with 500rpm stirs 1min; With speed drop to 40rpm; Add the 2mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min at a slow speed.Whipping process finishes, and enters settling pond and carries out solid-liquid separation.COD and chroma removal rate are respectively 86% and 96%.Organism in the supernatant liquor (COD) concentration is reduced to 140mg/L, supernatant liquor (flocculation water outlet) pH value 4.4.The flco that flocculation produces can sedimentation fully in 15min.
Embodiment 2:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---Tai-Ace S 150, the COD concentration of yeast wastewater bio-chemical effluent is 1000mg/L, adds 4.5g (13.5mM Al in every liter of yeast wastewater bio-chemical effluent
3+) Tai-Ace S 150, earlier the rotating speed with 300rpm stirs 2min; With speed drop to 40rpm; Add the 10mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min more at a slow speed.Whipping process finishes, and enters settling pond and carries out solid-liquid separation.COD and chroma removal rate are respectively 66% and 87%.Organism in the supernatant liquor (COD) concentration is reduced to 340mg/L, supernatant liquor (flocculation water outlet) pH value 5.3.Flco can sedimentation fully in 10min.
Embodiment 3:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---polymerize aluminum chloride, the COD concentration of yeast wastewater bio-chemical effluent is 1000mg/L, the polymerize aluminum chloride that adds 6.0g in every liter of yeast wastewater bio-chemical effluent, the rotating speed with 500rpm stirs 1min earlier; With speed drop to 40rpm; Add the 2mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min more at a slow speed.Whipping process finishes, and enters settling pond and carries out solid-liquid separation.COD and chroma removal rate are respectively 75% and 91%.COD concentration is reduced to 250mg/L in the supernatant liquor, supernatant liquor (flocculation water outlet) pH value 5.5.
Embodiment 4:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---ferric sulfate, the COD concentration of yeast wastewater bio-chemical effluent is 1000mg/L, adds 3.0g (15mM Fe in every liter of yeast wastewater bio-chemical effluent
3+) ferric sulfate, earlier with 300rpm (rev/min) rotating speed stir 2min; With speed drop to 60rpm; Add the 5mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min more at a slow speed; Enter settling pond after the stirring and carry out solid-liquid separation, settling of floccus gets supernatant liquor; COD and chroma removal rate reach 77% and 90% respectively; The COD concentration of supernatant liquor is reduced to 230mg/L, supernatant liquor (flocculation water outlet) pH value 4.1.
Supernatant liquor is through charcoal absorption, and charcoal absorption is in pH value＜7, and temperature is to carry out under 65 ℃ the condition, must purify waste water; Gac is the particle charcoal, and whenever going up the required granulated active carbon consumption of clear liquid is 11g.Organic removal rate reaches more than 95%, and color removes fully; Outlet water organic substance concentration after the charcoal absorption is lower than 50mg/L, can be back to produce or other link.
Embodiment 5:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---aluminum chloride, the COD concentration of yeast wastewater bio-chemical effluent is 1750mg/L, adds 5.5g (23mM Al in every liter of yeast wastewater bio-chemical effluent
3+) aluminum chloride, earlier with 600rpm (rev/min) rotating speed stir 1min; With speed drop to 60rpm; Add the 5mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min more at a slow speed; Enter settling pond after the stirring and carry out solid-liquid separation, settling of floccus gets supernatant liquor; COD and chroma removal rate reach 78% and 92% respectively; The COD concentration of supernatant liquor is reduced to 380mg/L, supernatant liquor (flocculation water outlet) pH value 5.9.
Embodiment 6:
A kind of method of yeast wastewater advanced treatment, it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent of yeast wastewater gained after biochemical treatment that the yeast production process produces---iron nitrate, the COD concentration of yeast wastewater bio-chemical effluent is 1750mg/L, adds 9.5g (23.5mM Fe in every liter of yeast wastewater bio-chemical effluent
3+) iron nitrate, earlier the rotating speed with 500rpm stirs 1min; With speed drop to 60rpm; Add the 5mg cationic-type polyacrylamide in every liter of yeast wastewater bio-chemical effluent then, stir 10min more at a slow speed; Whipping process finishes, and enters settling pond and carries out solid-liquid separation, and settling of floccus gets supernatant liquor; COD and chroma removal rate reach 88% and 98% respectively; The COD concentration of supernatant liquor is reduced to 210mg/L, supernatant liquor (flocculation water outlet) pH value 4.3.Flco can sedimentation fully in 15min.
Supernatant liquor adsorbs with the Powdered Activated Carbon of 2g/L at normal temperatures, adsorption time 60min, and after mixed solution filtered, filtrate (purifying waste water) color removed fully, and COD concentration is lower than 50mg/L.
Claims (3)
1. the method for a yeast wastewater advanced treatment is characterized in that it comprises the steps: to add inorganic flocculating agent in the yeast wastewater bio-chemical effluent after biochemical treatment, stirs fast, and the mixing speed of whipping process is 300～600rpm fast; Described inorganic flocculating agent is a molysite, and the add-on of inorganic flocculating agent is pressed: add 11～15mmol Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+Add organic floculant then, stir, organic floculant is a cationic-type polyacrylamide, the organic floculant that adds 2～10mg in every liter of yeast wastewater bio-chemical effluent, enter settling pond after the stirring and carry out solid-liquid separation, settling of floccus, supernatant liquor is further removed COD and colourity by charcoal absorption;
Described supernatant liquor is to carry out under pH value＜7, temperature are 15～65 ℃ condition by charcoal absorption, must purify waste water; When gac is powder, whenever go up the required Powdered Activated Carbon consumption of clear liquid greater than 1g; When gac is particle, whenever go up the required granulated active carbon consumption of clear liquid greater than 10g.
2. the method for a kind of yeast wastewater advanced treatment according to claim 1 is characterized in that: described molysite is iron(ic) chloride, ferric sulfate, iron nitrate or high molecular bodied ferric sulfate.
3. the method for a kind of yeast wastewater advanced treatment according to claim 1, it is characterized in that: when described inorganic flocculating agent was iron(ic) chloride or iron nitrate, the add-on of inorganic flocculating agent was pressed: add 11～14mmol Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+When described inorganic flocculating agent was ferric sulfate or bodied ferric sulfate, the add-on of inorganic flocculating agent was pressed: add 12～15mmol Fe in the yeast wastewater bio-chemical effluent of every 1gCOD
3+
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| CN102515445A (en) * | 2011-12-30 | 2012-06-27 | 安琪酵母股份有限公司 | System and method for treatment of high-concentration yeast wastewater |
| CN102998347B (en) * | 2012-11-20 | 2016-06-22 | 中国科学院重庆绿色智能技术研究院 | Method for detecting chemical oxygen demand and equipment based on supercritical water oxidation |
| CN112694203A (en) * | 2019-10-21 | 2021-04-23 | 中国石油化工股份有限公司 | Treatment method of sewage containing heavy metals and high COD value |
| CN111792750B (en) * | 2020-06-17 | 2022-04-15 | 中国科学院青岛生物能源与过程研究所 | Fermentation liquor pretreatment method by coupling flocculation adsorption |
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