CN103585963B - A kind of chromate waste water process biological adsorption agent preparation method and application thereof - Google Patents
A kind of chromate waste water process biological adsorption agent preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to technical field of heavy metal wastewater treatment, be specifically related to a kind of preparation method and application of Aureobasidium pullulans fermenting wheat bran adsorbent.Concrete grammar: by wheat bran pulverize after, inoculum density be the Aureobasidium pullulans cell liquid of 5 ~ 15% in 20 ~ 30 DEG C of solid state fermentation 48 ~ 120h, obtain the Biosorbent for heavy metals containing Pul, Aureobasidium pullulans somatic cells and fermenting wheat bran residue.By obtained adsorbent for the treatment of industrial wastewater, remove the heavy metal ion chromium in waste water, the wheat bran adsorbent of Adsorption of Chromium ion is used for burning electricity generation, simultaneously heavy metal chromium in separation and recovery lime-ash, and incineration residue is used as fertilizer auxiliary material and fertilizes the soil.This invention not only achieves the high-efficiency comprehensive utilization of agricultural wastes resource, and it is extensive to have raw material sources, and cheap and easy to get, product cost is low, and technique is simple, does not pollute the waste water of environment, waste residue, and adsorption capacity is large, steady performance.
Description
Technical field
The present invention relates to the preparation of biological adsorption agent and the technical field of heavy metals in industrial wastewater pollutant control, be specifically related to a kind of preparation method of Aureobasidium pullulans fermenting wheat bran adsorbent and the application in chromate waste water process.
Background technology
Toxic heavy metal in air, water and soil, as chromium manganese, becomes global problem just gradually to the serious threat of environment, therefore just becomes one with effective removal of the toxic heavy metal ion of environmental correclation and isolation technics and is imbued with challenging work.At present, countries in the world process for treating heavy-metal waste water mainly contains three classes: the first kind is the method that heavy metal ions in wastewater passes through to occur chemical reaction removing, comprises moderate water-cut stage, sulphide precipitation, ferrite coprecipitation, chemical reduction method, electrochemical reducing and high molecular heavy metals trapping agent method etc.Equations of The Second Kind makes the heavy metal in waste water under the condition not changing its chemical form, carry out the method for adsorbing, concentrating, being separated, and comprises absorption, solvent extraction, evaporation and freezing method, ion-exchange and membrane separation process etc.3rd class removes the method for heavy metal in waste water by the effect such as flocculation, absorption, accumulation, enrichment of microorganism or plant, comprising bioflocculation, biochemical process and plant ecological reparation etc.
Traditional chemistry, Physical processing cost is high, effect is unstable, except application cleaner production and recycling economy technology from heavy metal source use and except discharge contains, also need the improvement that research and development new type natural adsorbent, heavy metal chelating agent and biotechnology heavy metal are more polluted, play the advantage that their costs are low, efficiency is high, and strengthen the integrated application of multiple Treatment process, find and administer the new effective way of heavy metal pollution, to the quality and the efficiency important in inhibiting that improve sewage disposal.
In recent years, research about " cheapness " adsorbent heavy-metal ion removal is a lot, utilize agricultural by-products, the research making heavy metal ion in adsorbent removal solution as wood chip, bark, husk, wheat bran, maize peel and corncob etc. receives much concern, and industrial waste and the animal bone powders etc. such as active carbon, flyash, scrap rubber also can be used for heavy-metal ion removal.The long-term wheat yield of China is up to about 1.15 hundred million tons, and the wheat bran produced in flour processing process is at 3000 ~ 3,500 ten thousand tons, and aboundresources, cheap and easy to get, at present, the wheat bran main application of China makes feed, and economic worth is not high.Containing the functional group such as a large amount of celluloses and protein in wheat bran, can be used for absorption or complexation heavy metal ion, but its adsorbance is but very little, limits its actual utilization in the industry; Researcher has carried out study on the modification to wheat bran, or activation is prepared into active carbon, increases its specific area, thus increase its adsorbance, but such modification is all through acid, alkali treatment, easy contaminated environment and processing cost high, limit its application in the industry.
Based on effectively solving containing Problems existing in chromium production wastewater treatment technique at present, adopt the process of Aureobasidium pullulans solid state fermentation wheat bran containing the factory effluent of chromium, wheat bran can be collected, Aureobasidium pullulans thalline, the adsorptivity of Pul three is in one, and due to Aureobasidium pullulans be edible safety fungi, substantially increase absorption property and the security of heavy metal, and solid state fermentation prepares biological adsorption agent, technique is simple, low production cost, do not produce environmental contaminants, and Adsorption of Chromium saturated after wheat bran adsorbent can separate chromium, carry out recycling, to guarantee the chromium pollutant qualified discharge in waste water, realize environmental benefit and economic benefit doulbe-sides' victory.
Summary of the invention
In view of the present situation of traditional chromate waste water process, the invention provides a kind of biological adsorption agent prepared with Aureobasidium pullulans solid state fermentation wheat bran and with low cost, the highly effective and safe method that utilize chromium in its Adsorption waste water.
To achieve these goals, the technical scheme that the present invention proposes is:
A preparation method for Aureobasidium pullulans solid state fermentation wheat bran adsorbent, concrete steps are as follows:
(1) pretreatment of wheat bran
1. 60 DEG C, wheat bran is pulverized after drying, and crosses 100 orders and 40 order sub-sieves respectively, gets 100 orders and 40 order sub-sieve lower parts of screen respectively and divides and mix with the ratio of 1: 3;
2. the preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, 0.01%VB1, adjusts pH to 6.0 with the HCl solution that concentration is 0.1mol/L;
3. get and pulverize after wheat bran mixture mixes with the ratio of 1: 1.5 (m/v) with nutritive water, in 121 DEG C of boiling 0.5h, obtain wheat bran pretreatment thing;
(2) fermentation of wheat bran adsorbent is standby
The wheat bran pretreatment thing obtained in (1) is loaded fermentation vat, and inoculate the Aureobasidium pullulans somatic cells (m/m) of 5 ~ 10%, after 20 ~ 25 DEG C of fermentation 1 ~ 3d, supplement the nutrients after water in wheat bran fermentation vat by material-water ratio 1: 0.25, be warmed up to 25 ~ 30 DEG C, then obtain wheat bran adsorbent after the 3 ~ 5d that ferments.
A kind of wheat bran adsorbent removes the method for heavy metals in industrial wastewater chromium ion, described method comprises: the waste water containing chromium is injected wheat bran adsorbent fermentation vat, the ratio controlling adsorbent and waste water is 10: 100 ~ 60: 100 (quality: volume), the concentration of heavy metal in waste water chromium ion is 100 ~ 500mg/L, adopts 0.1mol/LH
2sO
4regulate its pH to 1 ~ 7 with NaOH, carry out adsorption reaction 30 ~ 60min, detect chromium content in waste water up to standard after, then carry out Separation of Solid and Liquid, the waste water of emission compliance.
Described wheat bran adsorbent removes the method for heavy metals in industrial wastewater chromium ion, it is characterized in that: continuously or in batches waste water is injected the heavy metal wastewater thereby of wheat bran fermentation vat process containing chromium, saturated to wheat bran adsorbent.
Described recovery, containing the method for heavy metal chromium wheat bran, is characterized in that described method comprises: wheat bran fermentation vat has taper false end delivery port, after heavy metal wastewater thereby detection is up to standard, opens delivery port and carries out waste discharge, reclaim containing heavy metal wheat bran.
Described a kind ofly fully utilize the wheat bran of Adsorption of Heavy Metals chromium ion and reclaim the method for chromium, it is characterized in that: the wheat bran adsorbent being adsorbed with heavy metal chromium is reclaimed, reclaim heavy metal chromium for combustion power generation after pressing dry, the lime-ash isolating chromium is used as fertilizer auxiliary material and fertilizes the soil.
Described recovery heavy metal chromium method, it is characterized in that described method comprises: recovery contains the wheat bran of heavy metal through pressing dry to water content 20-30%, natural drying, for burning electricity generation, inoculate Aureobasidium pullulans cell liquid 5-10% heap cultivation 10-20d in combustion ashes after, heavy metal chromium enters in solution, thus chromium is isolated in recovery in combustion ashes, the heap fermentation lime-ash isolating chromium is used as biological organic fertilizer auxiliary material and fertilizes the soil.
Compared with prior art, advantage of the present invention and beneficial effect are:
1, raw material wheat bran wide material sources, with low cost, and utilize agricultural machining discarded object to prepare efficient adsorption material, meets the treatment of wastes with processes of wastes against one another, resource high-efficiency comprehensive utilization theory.
2, sorbing material preparation technology used is easy to operate, simple.
3, the biological adsorption agent process proposing first to adopt Aureobasidium pullulans solid state fermentation wheat bran to prepare is studied containing the factory effluent of chromium, prepares a kind of new adsorbent, and controlling new technology to development heavy metal pollution has practical significance.
4, preparation-obtained new adsorbent Aureobasidium pullulans solid state fermentation wheat bran, the adsorptivity of wheat bran, Aureobasidium pullulans thalline, Pul three can be integrated, for chromate waste water, there is higher treatment effeciency and good absorption property, and processing cost is cheap, easy to operate.For the process of poisonous Recalcitrant chemicals heavy metal chromium ion industrial wastewater provides scientific basis.
5, the adsorbent that prepared by the present invention belongs to environmental friendliness shaped material, can not produce secondary pollution.Wheat bran adsorbent after Adsorption of Chromium is saturated provides the energy by burning for generating electricity, and reclaims heavy metal, and combustion ashes fertilizes the soil as biological organic fertilizer auxiliary material, does not pollute the waste water of environment, waste residue, takes full advantage of useful resources simultaneously.The theory of cleaner production and recycling economy is introduced among the improvement of heavy metal wastewater thereby by this invention, considers resource reclaim, realize economic benefit and environmental benefit doulbe-sides' victory while pollution administration.For the engineering design of reality and application provide technical support, also for the process of sewage provides new method.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described, but this example just lifted for the ease of understanding, should not be considered to be limitation of the scope of the invention.Equally; any person of ordinary skill in the field all can according to the description of technical scheme of the present invention and preferred embodiment thereof; make various possible equivalent change or replacement, but all these change or replace the protection domain that all should belong to claim of the present invention.
The non-fermenting wheat bran of embodiment 1 is to Cr
6+adsorption effect is studied
1. the pretreatment of wheat bran
After wheat bran dries pulverizing in 60 DEG C, cross 40 mesh sieve screenings, use 0.1mol/LH
2sO
4adjust pH to desirable value with NaOH solution, and regulate wheat bran liquid concentration to desired concn, in 121 DEG C of insulation 0.5h.
2. adsorption treatment method
Get 100ml initial concentration and be respectively 300mg/LCr
6+solution, in 250ml conical flask, uses 0.1mol/LH
2sO
4regulate its pH to 1.0 with NaOH, 2.0,3.0,3.8,4.7,5.9 and 7.0, add 10,20,30,40,50,60g/L wheat bran, be placed in temperature to be respectively 150rpm in the water-bath constant temperature oscillator of 25,30,35,40 and 45 DEG C and to carry out vibration adsorption reaction, 0.25,0.5,1,1.5 and 2h after filter respectively, pipette certain supernatant, all dilute 100 times, use atomic absorption spectroscopy determination concentration of metal ions, and draw optimal adsorption condition.
Blank is the mixed liquor of 50mL solion and 50mL deionized water, and under optimal adsorption condition, same shaking table vibration, pipettes certain solution, dilute 100 times, use atomic absorption spectroscopy determination concentration of metal ions.
3. the preparation of standard liquid
Accurately take the potassium bichromate of 88.254g, put in beaker, after making it dissolve with a small amount of distilled water stirring, move in the volumetric flask of 1000mL, adding distil water constant volume, is made into containing Cr
6+the solution of 300mg/L, then be diluted to variable concentrations and carry out making Cr
6+calibration curve.
4.Cr
6+adsorption rate analysis
Get containing Cr
6+the solution 5mL of 300mg/L, put into 100mL triangular flask, add the above-mentioned adsorbent of 5mL (every sample repeats three times), shaking table is placed under optimal adsorption condition, after 150r/min vibration, the centrifugal 5min of 10000r, pipettes certain supernatant, dilute 100 times, use atomic absorption spectroscopy determination concentration of metal ions.Blank is the mixed liquor of 5mL solion and 5mL deionized water, and under optimal adsorption condition, same shaking table vibration, pipettes certain solution, dilute 100 times, use atomic absorption spectroscopy determination concentration of metal ions, and calculate adsorption rate.
Adsorption rate=(C
0-C
t)/C
0
In formula: C
0for the concentration (mg/L) of blank; C
tfor the supernatant (mg/L) after absorption.
5. wheat bran is to Cr
6+adsorption effect
Table 1 exhausted water pH adsorbs Cr to wheat bran
6+impact
Table 2 wheat bran injected volume adsorbs Cr to wheat bran
6+impact
Table 3 adsorption time adsorbs Cr to wheat bran
6+impact
From table 1,2 and 3, wheat bran is to Cr
6+adsorption rate can reduce along with the rising of exhausted water pH value, but along with wheat bran throw in concentration improve and adsorption time prolongation and increase, but when wheat bran input concentration rise to 30g/L, adsorption time reach 1h time, adsorb substantially reach balance, ascensional range is very little.
Embodiment 2 Aureobasidium pullulans thalline heavy metal adsorption effect is studied
1. the preparation of bacterium culture medium
Strain activation and culture base (g/L): potato 200 sucrose 20 peptone 5 agar powder 20pH nature distilled water 1000mL0.103MPa sterilizing 20min;
Seed culture medium (g/L): sucrose 50, Na
2hPO
45.0, yeast extract 3.0, MgSO
47H
2o0.2, (NH
4)
2sO
40.6, NaCl0.1, pH6.0, distilled water 1000mL, 0.103Mpa, sterilizing 20min;
Fermentation medium (g/L): sucrose 50, Na
2hPO
45.0, yeast extract 2.0, MgSO
47H
2o0.4, (NH
4)
2sO
40.6, NaCl0.1, pH6.5, distilled water 1000mL, 0.103MPa, sterilizing 20min.
2. the preparation method of Aureobasidium pullulans thalline
Be inoculated in fresh fermentation medium by activating the inoculum concentration of thalline with 2%, control pH6.0,30 DEG C, 150r/min Shaking culture 4d.The centrifugal 5min of 10000r, collects thalline, and thalline is through deionized water washing twice, and supernatant discarded, obtains wet thallus stand-by.
3. Aureobasidium pullulans thalline is to Cr
6+absorption
Adopt four factors (pH, time, bacterium amount, temperature) three horizontal L
9(3
4) orthogonal experiment research Aureobasidium pullulans thalline is to Cr
6+optimal adsorption condition.Get the triangular flask of 9 250mL, take 80 respectively, 160,320mg Aureobasidium pullulans thalline, render to containing 100mLCr
6+concentration is in the triangular flask of 300mg/L waste water, temperature is regulated to 10,20,30 DEG C respectively, pH is regulated to 3,4,5 respectively, be placed in water bath with thermostatic control shaking table, under 150r/min, vibrate 0.25 respectively, 0.5,1h, the then centrifugal 5min of 10000rpm, pipette certain supernatant, dilute 100 times, adopt atomic absorption spectroscopy determination concentration of metal ions, and draw optimal adsorption condition.
Blank is the mixed liquor of 50mL solion and 50mL deionized water, and under optimal adsorption condition, same shaking table vibration, pipettes certain solution, dilute 100 times, use atomic absorption spectroscopy determination concentration of metal ions.
5. the preparation of standard liquid
With in embodiment 13.
6.Cr
6+adsorption rate analysis
With in embodiment 14.
7. Aureobasidium pullulans thalline is to Cr
6+adsorption effect
Aureobasidium pullulans thalline is adopted to carry out Cr
6+absorption orthogonal experiment, after atomic absorption spectrophotometer detects, draw the concentration of Aureobasidium pullulans thalline Adsorption of Chromium ion under each experiment condition, and adsorption rate, in table 4.
Table 4 Aureobasidium pullulans thalline absorption Cr
6+orthogonal experiment results
As shown in Table 4, Aureobasidium pullulans thalline absorption Cr
6+optimum condition be: control pH is 3, in 30 DEG C absorption 1h.Cr in aqueous
6+exist with different forms, acidity determines the number shared by various form.During pH < 4, HCrO
4 -for Main Morphology; During pH > 7, CrO
4 2-for Main Morphology.Experimental result shows, when pH is 3, adsorption effect is better, shows Cr
6+main with HCrO
4 -form is adsorbed by thalline.Four factors is to Aureobasidium pullulans thalline absorption Cr
6+influential effect size order is followed successively by pH > bacterium amount > time > temperature.This is because solution ph affects chemical state and the adsorbent cell surface metal adsorption site of metal ion simultaneously.When pH value is low, the linking group of cell membrane can be hydrated hydrogen ion and occupy, and hinder close to cell of metal ion due to repulsion effect, pH value is lower, and resistance is larger.As H in solution
+when concentration reduces, more adsorption site position can be exposed, be then conducive to the close of metal ion and be adsorbed on cell surface.Under the condition that concentration of metal ions is certain, along with the increase of bacterium amount, metal biosorption amount is also increased, but after metal ion fully occupies cell point position, absorption reaches balance, the size of bacterium amount, just no longer affects effective absorption of metal ion.Adsorption time is also one of reason of impact absorption, and be increased to necessarily when the time, absorption reaches balance, and continue to increase adsorption time, adsorption effect is not obvious.Adsorption temp mainly by affecting group heat of adsorption power, the factor such as absorption thermal capacitance and physiological metabolism activity etc. of thalline, and then affects adsorption effect.Due to Cr in this experiment
6+main with HCrO
4 -form is adsorbed by thalline, and it mainly relies on adsorption to metal biosorption, and the absorption property impact of temperature on it is also little.
Embodiment 3 Aureobasidium pullulans solid state fermentation wheat bran heavy metal adsorption effect is studied
1. the preparation of bacterium culture medium
Strain activation and culture base (g/L): with embodiment 2;
Seed culture medium (g/L): with embodiment 2;
2. Aureobasidium pullulans solid state fermentation wheat bran prepares the method for adsorbent
(1) 60 DEG C, wheat bran is pulverized after drying, and crosses 100 orders and 40 order sub-sieves respectively, gets 100 orders and 40 order sub-sieve lower parts of screen respectively and divides and mix with the ratio of 1: 3;
(2) preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, 0.01%VB1, adjusts pH to 6.0 with the HCl solution that concentration is 0.1mol/L;
(3) get and pulverize after wheat bran mixture mixes with the ratio of 1: 1.5 (m/v) with nutritive water, in 121 DEG C of boiling 0.5h, obtain wheat bran pretreatment thing;
(4) the wheat bran pretreatment thing prepared is loaded fermentation vat, and inoculate the Aureobasidium pullulans somatic cells (m/m) of 5%, after 25 DEG C of fermentation 3d, supplement the nutrients after water in wheat bran fermentation vat by material-water ratio 1: 0.25, be warmed up to 28 DEG C of 3d that ferment again and obtain wheat bran adsorbent, for subsequent use.
3. adsorption treatment method
Get 100ml initial concentration and be respectively 300mg/LCr
6+solution, in 250ml conical flask, adopts 0.1mol/LH
2sO
4regulate its pH to 1.0 respectively with NaOH, 2.0, 3.0, 3.8, 4.7, 5.9 and 7.0, add 10 respectively, 20, 30, 40, 50, the wheat bran adsorbent that 60g/L Aureobasidium pullulans fermented is (containing Pul, the mixtures such as Aureobasidium pullulans somatic cells and wheat bran fermentation residue), be placed in temperature and be respectively 25, 30, 35, in the water-bath constant temperature oscillator of 40 and 45 DEG C, 150rpm carries out vibration adsorption reaction, absorption 0.25, 0.5, 1, 1.5 and 2h after filter respectively, pipette certain supernatant, dilute 100 times, adopt atomic absorption spectroscopy determination concentration of metal ions, and draw optimal adsorption condition.
Blank is the mixed liquor of 50mL solion and 50mL deionized water, and under optimal adsorption condition, same shaking table vibration, pipettes certain solution, dilute 100 times, adopt atomic absorption spectroscopy determination concentration of metal ions.
4. the preparation of standard liquid
With in embodiment 13.
5.Cr
6+adsorption rate analysis
With in embodiment 14.
6. Aureobasidium pullulans fermenting wheat bran adsorbent is to Cr
6+adsorption effect
Table 5 exhausted water pH is to Aureobasidium pullulans fermenting wheat bran absorption Cr
6+impact
Table 6 Aureobasidium pullulans fermenting wheat bran addition is to absorption Cr
6+impact
Table 7 adsorption time is to Aureobasidium pullulans fermenting wheat bran absorption Cr
6+impact
From table 5,6 and 7, adopt the wheat bran process waste water after Aureobasidium pullulans fermentation, to Cr
6+adsorption rate can reduce along with the rising of exhausted water pH value, but increase along with the wheat bran interpolation raising of concentration after fermentation and the prolongation of adsorption time, when wheat bran add concentration rise to 40g/L, adsorption time reach 1h time, absorption reaches balance substantially, ascensional range is very little, but the most high adsorption rate of purer wheat bran improves 70.04%, and purer Aureobasidium pullulans somatic cells improves 264.78%.As can be seen here, the wheat bran after Aureobasidium pullulans solid state fermentation is used for containing heavy metal Cr
6+the process of waste water, effectively raises the adsorption rate of heavy metal, and operating procedure is simple, more economically.
The method of embodiment 4 Aureobasidium pullulans solid state fermentation wheat bran adsorbent application
Being 300mg/L by 20 cubic metres containing total chromium concn, waste water injects containing 4 tons of wheat bran adsorbent fermentation vats, adopts 0.1mol/LH
2sO
4regulate its pH to 2, carry out Aerated stirring adsorption reaction, detect chromium content in waste water at any time, after up to standard, the taper false end delivery port opening wheat bran fermentation vat carries out emission compliance waste water; Close delivery port subsequently, inject the chromium that new chromate waste water adsorbs waste water again, until wheat bran adsorbent saturated be extremely.Carry out Separation of Solid and Liquid, reclaim containing heavy metal wheat bran, through pressing dry to water content 20-30%, natural drying 2d, for burning electricity generation, inoculate after Aureobasidium pullulans cell liquid 5% heaps fermented and cultured 12d in combustion ashes, heavy metal chromium enters fermentation and oozes out in solution, thus chromium is isolated in recovery in combustion ashes, and the heap fermentation lime-ash isolating chromium is used as biological organic fertilizer auxiliary material and fertilizes the soil.
Claims (5)
1. a preparation method for Aureobasidium pullulans solid state fermentation wheat bran adsorbent, concrete steps are as follows:
(1) pretreatment of wheat bran
1. 60 DEG C, wheat bran is pulverized after drying, and crosses 100 orders and 40 order sub-sieves respectively, gets 100 orders and 40 order sub-sieve lower parts of screen respectively and divides and mix with the ratio of 1: 3;
2. the preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, 0.01%VB1, adjusts pH to 6.0 with the HCl solution that concentration is 0.1mol/L;
3. get pulverize wheat bran mixture and nutritive water with 1: 1.5 mass volume ratio mix after, in 121 DEG C of boiling 0.5h, obtain wheat bran pretreatment thing;
(2) fermentation of wheat bran adsorbent is standby
The wheat bran pretreatment thing obtained in (1) is loaded fermentation vat, and inoculation accounts for the Aureobasidium pullulans somatic cells of wheat bran pre-treatment substance amount 5 ~ 10%, after 20 ~ 25 DEG C of fermentation 1 ~ 3d, supplement the nutrients after water in wheat bran fermentation vat by material water quality volume ratio 1: 0.25, be warmed up to 25 ~ 30 DEG C, then obtain wheat bran adsorbent after the 3 ~ 5d that ferments.
2. the wheat bran adsorbent that a preparation method according to claim 1 obtains removes the method for heavy metals in industrial wastewater chromium ion, described method comprises: the waste water containing chromium is injected wheat bran adsorbent fermentation vat, the mass volume ratio controlling adsorbent and waste water is 10: 100 ~ 60: 100 tons/cubic metre, the concentration of heavy metal in waste water chromium ion is 100 ~ 500mg/L, adopts 0.1mol/LH
2sO
4regulate its pH to 1 ~ 7 with NaOH, carry out adsorption reaction 30 ~ 60min, detect chromium content in waste water up to standard after, then carry out Separation of Solid and Liquid, the waste water of emission compliance.
3. method as claimed in claim 2, is characterized in that: continuously or in batches waste water is injected the heavy metal wastewater thereby of wheat bran fermentation vat process containing chromium, saturated to wheat bran adsorbent.
4. method as claimed in claim 2, is characterized in that described method comprises: wheat bran fermentation vat has taper false end delivery port, after heavy metal wastewater thereby detection is up to standard, opens delivery port and carries out waste discharge, reclaim the wheat bran of Adsorption of Heavy Metals chromium ion.
5. fully utilize a method for the wheat bran of Adsorption of Heavy Metals chromium ion according to claim 4, it is characterized in that:
Recovery contains the wheat bran of heavy metal through pressing dry to water content 20 ~ 30%, natural drying, for burning electricity generation, Aureobasidium pullulans cell liquid is inoculated in combustion ashes, Aureobasidium pullulans cell liquid be 5 ~ 10% with the volume mass ratio of lime-ash, after heaping cultivation 10 ~ 20d, heavy metal chromium enters in solution, thus chromium is isolated in recovery in combustion ashes, and the heap fermentation lime-ash isolating chromium is used as biological organic fertilizer auxiliary material and fertilizes the soil.
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