CN103585963A - Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof - Google Patents
Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of heavy-metal wastewater treatment and particularly relates to a method for preparing an aureobasidium pullulans fermented wheat-bran adsorbent and application of the adsorbent. The method specifically comprises the steps of crushing wheat bran, then, inoculating aureobasidium pullulans cell sap with the concentration of 5-15%, and carrying out solid-state fermentation for 48-120 hours at the temperature of 20-30 DEG C, thereby obtaining the heavy-metal bio-adsorbent which contains pullulan, aureobasidium pullulans thallus cells and fermented wheat bran residues. According to the application, the prepared adsorbent is applied to industrial wastewater treatment so as to remove heavy-metal chromium ions from wastewater, the chromium ion adsorbed wheat-bran adsorbent is applied to incineration power generation, meanwhile, heavy-metal chromium is separated and recovered from ash slag, and the incineration ash slag is applied to soil fertilization serving as an organic fertilizer adjuvant. According to the method and the application, not only is the efficient comprehensive utilization of agricultural waste resources realized, but also the method has the advantages that the raw materials are wide in source, are cheap and are easily obtained, the cost of the product is low, the process is simple, waste water and waste residues which pollute the environment are not caused, the adsorption capacity is large, the performance is stable, and the like.
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 and application in chromate waste water is processed of Aureobasidium pullulans fermenting wheat bran adsorbent.
Background technology
Therefore toxic heavy metal in air, water and soil, as chromium manganese, becomes global problem just gradually to the serious threat of environment, just becomes one be imbued with challenging work with effective removal of the toxic heavy metal ion of environmental correclation and isolation technics.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 is removed by there is chemical reaction, comprises neutralization precipitation method, sulphide precipitation, ferrite coprecipitation, chemical reduction method, electrochemical reducing and high molecular heavy metals trapping agent method etc.Equations of The Second Kind is to make that heavy metal in waste water adsorbs, concentrates under the condition that does not change its chemical form, separated method, comprises absorption, solvent extraction, evaporation and freezing method, ion-exchange and membrane separation process etc.The 3rd class is the method that heavy metal in waste water is removed in the effects such as flocculation by microorganism or plant, absorption, accumulation, enrichment, 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 source to heavy metal use and discharge contains, also need research and development new type natural adsorbent, heavy metal chelating agent and the biotechnology improvement to heavy metal pollution more, bring into play the advantage that their costs are low, efficiency is high, and strengthen the integrated application of multiple improvement technology, find and administer the new effective way of heavy metal pollution, to improving quality and the efficiency important in inhibiting of sewage disposal.
In recent years, research about " cheapness " adsorbent heavy-metal ion removal is a lot, utilize agricultural by-products, the research of making heavy metal ion in adsorbent removal solution as wood chip, bark, husk, wheat bran, maize peel and corncob etc. receives much concern, and the industrial wastes such as active carbon, flyash, scrap rubber and animal bone powder etc. also can be used for heavy-metal ion removal.The long-term wheat yield of China is up to 1.15 hundred million tons of left and right, and the wheat bran producing in flour process is at 3000～3,500 ten thousand tons, aboundresources, and cheap and easy to get, at present, the wheat bran main application of China is to make feed, economic worth is not high.In wheat bran, contain the functional groups such as a large amount of celluloses and protein, can be used for absorption or complexation heavy metal ion, but its adsorbance is but very little, has limited its actual utilization in industry; Researcher has carried out study on the modification to wheat bran, or activation be prepared into active carbon, increase its specific area, thereby increase its adsorbance, but such modification is all through peracid, alkali treatment, easily contaminated environment and processing cost are high, have limited its application in industry.
Based on effectively solving and contain the problem existing in chromium production wastewater treatment technique at present, adopt Aureobasidium pullulans solid state fermentation wheat bran to process the factory effluent containing chromium, can collect wheat bran, Aureobasidium pullulans thalline, Pul three's adsorptivity is in one, and because Aureobasidium pullulans is edible safety fungi, greatly improved the absorption property of heavy metal and security, and solid state fermentation is prepared biological adsorption agent, technique is simple, low production cost, do not produce environmental contaminants, and the wheat bran adsorbent after Adsorption of Chromium is saturated 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 that traditional chromate waste water is processed, with low cost, the highly effective and safe method that the invention provides a kind of biological adsorption agent of preparing with Aureobasidium pullulans solid state fermentation wheat bran and 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. after 60 ℃ of oven dry of wheat bran, pulverize, cross respectively 100 orders and 40 order sub-sieves, get respectively 100 orders and 40 order sub-sieve lower parts of screen and divide with the ratio of 1: 3 and mix;
2. the preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, the HCl solution that 0.01%VB1 is 0.1mol/L by concentration is adjusted pH to 6.0;
3., after getting and pulverizing wheat bran mixture and mix with the ratio of 1: 1.5 (m/v) with nutritive water, in 121 ℃ of boiling 0.5h, obtain wheat bran pretreatment thing;
(2) fermentation of wheat bran adsorbent preparation
Pack the wheat bran pretreatment thing obtaining in (1) into fermentation vat, and inoculate 5～10% Aureobasidium pullulans somatic cells (m/m), after 20～25 ℃ of fermentation 1～3d, by material-water ratio, to wheat bran fermentation vat in supplement the nutrients water after at 1: 0.25, be warmed up to 25～30 ℃, then obtain wheat bran adsorbent after the 3～5d that ferments.
A kind of method of wheat bran adsorbent Adsorption heavy metals in industrial wastewater chromium ion, described method comprises: the waste water containing chromium is injected to wheat bran adsorbent fermentation vat, the ratio of 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/L H
2sO
4regulate its pH to 1～7 with NaOH, carry out adsorption reaction 30～60min, detect in waste water chromium content up to standard after, then carry out Separation of Solid and Liquid, the waste water of emission compliance.
The method of described wheat bran adsorbent Adsorption heavy metals in industrial wastewater chromium ion, is characterized in that: wheat bran fermentation vat that waste water is injected continuously or is in batches processed the heavy metal wastewater thereby containing chromium, saturated to the absorption of 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 delivery port of the false end of taper, after heavy metal wastewater thereby detection is up to standard, opens delivery port and carries out waste discharge, reclaims containing heavy metal wheat bran.
A kind of described method that fully utilizes the wheat bran of Adsorption of Heavy Metals chromium ion and reclaim chromium, it is characterized in that: have the wheat bran adsorbent of heavy metal chromium to reclaim absorption, after pressing dry, for combustion power generation and reclaim heavy metal chromium, the lime-ash of isolating chromium fertilizes the soil as fertilizer auxiliary material.
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, in combustion ashes, inoculate after Aureobasidium pullulans cell liquid 5-10% heap cultivation 10-20d, heavy metal chromium enters in solution, thereby in combustion ashes, reclaim and isolate chromium, the heap fermentation lime-ash of isolating chromium fertilizes the soil as biological organic fertilizer auxiliary material.
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, propose first to adopt biological adsorption agent processing prepared by Aureobasidium pullulans solid state fermentation wheat bran to study containing the factory effluent of chromium, prepare a kind of new adsorbent, development heavy metal pollution is controlled to new technology practical significance.
4, preparation-obtained new adsorbent Aureobasidium pullulans solid state fermentation wheat bran, the adsorptivity that can integrate wheat bran, Aureobasidium pullulans thalline, Pul three, for chromate waste water, there is higher treatment effeciency and good absorption property, and processing cost is cheap, easy to operate.For the processing of poisonous difficult degradation pollutant 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 can provide the energy for generating electricity by burning, and reclaims heavy metal, and combustion ashes fertilizes the soil as biological organic fertilizer auxiliary material, does not pollute waste water, the waste residue of environment, takes full advantage of useful resources simultaneously.This invention is introduced the theory of cleaner production and recycling economy among the improvement of heavy metal wastewater thereby, considers that resource reclaims, and realizes economic benefit and environmental benefit doulbe-sides' victory when administering pollution.For actual engineering design and application provide technical support, also the processing for sewage provides new method.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is further described, but this example of just lifting 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 be according to the description of technical scheme of the present invention and preferred embodiment thereof; make various possible being equal to and change or replace, but all these changes or replacement all should belong to the protection domain of claim of the present invention.
Embodiment 1 not fermenting wheat bran to Cr
6+adsorption effect research
1. the pretreatment of wheat bran
Wheat bran, after 60 ℃ of oven dry are pulverized, is crossed 40 mesh sieves screenings, uses 0.1mol/L H
2sO
4adjust pH to desirable value with NaOH solution, and regulate wheat bran liquid concentration to desired concn, in 121 ℃ of insulation 0.5h.
2. adsorption treatment method
Get 100ml initial concentration and be respectively 300mg/L Cr
6+solution, in 250ml conical flask, is used 0.1mol/L H
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 and be respectively 25,30, the 150rpm adsorption reaction of vibrating in the water-bath constant temperature oscillator of 35,40 and 45 ℃, 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, dilutes 100 times, uses 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, with a small amount of distilled water, stir and make, after its dissolving, to 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 make 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), under optimal adsorption condition, be placed in shaking table, 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, dilutes 100 times, uses atomic absorption spectroscopy determination concentration of metal ions, and calculates adsorption rate.
Adsorption rate=(C
0-C
t)/C
0
In formula: C
0concentration (mg/L) for blank; C
tfor the supernatant concentration (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 throws in that concentration improves and the prolongation of adsorption time and increasing, but when wheat bran input concentration rises to 30g/L, adsorption time and reaches 1h, adsorb and substantially reach balance, ascensional range is very little.
Embodiment 2 Aureobasidium pullulans thalline counterweight metal adsorption effect researchs
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
By activating the inoculum concentration of thalline with 2%, be inoculated in fresh fermentation medium, control pH6.0,30 ℃, 150r/min shaking flask cultivation 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 respectively 80,160,320mg Aureobasidium pullulans thalline, render to and contain 100mL Cr
6+concentration is in the triangular flask of 300mg/L waste water, temperature is regulated to respectively 10,20,30 ℃, pH is regulated to respectively 3,4,5, be placed in water bath with thermostatic control shaking table, under 150r/min, vibrate respectively 0.25,0.5,1h, 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, dilutes 100 times, uses 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
Adopt Aureobasidium pullulans thalline 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: controlling pH is 3, in 30 ℃ of absorption 1h.Cr in the aqueous solution
6+with different forms, exist, acidity determines the umber that various forms are shared.During pH < 4, HCrO
4 -for Main Morphology; During pH > 7, CrO
4 2-for Main Morphology.Experimental result shows, pH is 3 o'clock, and adsorption effect is better, shows Cr
6+mainly 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 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 because repulsion effect hinders close to cell of metal ion, pH value is lower, and resistance is larger.H in solution
+when concentration reduces, can expose more adsorption site position, be conducive to approaching and being adsorbed on cell surface of metal ion.Under the certain condition of concentration of metal ions, along with the increase of bacterium amount, the adsorbance of metal ion is also increased, but metal ion fully occupied behind cell point position, absorption reaches balance, and 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 after the time is increased to necessarily, absorption reaches balance, and continuing increases adsorption time, and adsorption effect is not obvious.Adsorption temp is mainly the factors such as group heat of adsorption power, absorption thermal capacitance and physiological metabolism activity by affecting thalline, and then affects adsorption effect.Due to Cr in this experiment
6+mainly with HCrO
4 -form is adsorbed by thalline, and it mainly relies on adsorption to the absorption of metal ion, and temperature is on its absorption property impact little.
Embodiment 3 Aureobasidium pullulans solid state fermentation wheat bran are to the research of heavy metal adsorption effect
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 is prepared the method for adsorbent
(1) after 60 ℃ of oven dry of wheat bran, pulverize, cross respectively 100 orders and 40 order sub-sieves, get respectively 100 orders and 40 order sub-sieve lower parts of screen and divide with the ratio of 1: 3 and mix;
(2) preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, the HCl solution that 0.01%VB1 is 0.1mol/L by concentration is adjusted pH to 6.0;
(3) after getting and pulverizing wheat bran mixture and mix with the ratio of 1: 1.5 (m/v) with nutritive water, in 121 ℃ of boiling 0.5h, obtain wheat bran pretreatment thing;
(4) pack the wheat bran pretreatment thing preparing into fermentation vat, and inoculate 5% Aureobasidium pullulans somatic cells (m/m), after 25 ℃ of fermentation 3d, by material-water ratio, to wheat bran fermentation vat in supplement the nutrients water after at 1: 0.25, be warmed up to 28 ℃ of 3d that ferment again and obtain wheat bran adsorbent, standby.
3. adsorption treatment method
Get 100ml initial concentration and be respectively 300mg/L Cr
6+solution, in 250ml conical flask, adopts 0.1mol/L H
2sO
4regulate respectively its pH to 1.0 with NaOH, 2.0, 3.0, 3.8, 4.7, 5.9 and 7.0, add respectively 10, 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, the 150rpm adsorption reaction of vibrating in the water-bath constant temperature oscillator of 40 and 45 ℃, 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, dilutes 100 times, adopts 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 after Aureobasidium pullulans fermentation to process waste water, to Cr
6+adsorption rate can reduce along with the rising of exhausted water pH value, but along with the wheat bran interpolation raising of concentration and the prolongation of adsorption time after fermentation, increase, when wheat bran adds concentration when rising to 40g/L, adsorption time and reaching 1h, absorption reaches balance substantially, ascensional range is very little, but the 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 for containing heavy metal Cr
6+the processing of waste water, effectively raises the adsorption rate to heavy metal, and operating procedure is simple, more economically.
The method of embodiment 4 Aureobasidium pullulans solid state fermentation wheat bran adsorbent application
By 20 cubic metres, contain the waste water that total chromium concn is 300mg/L and inject containing 4 tons of wheat bran adsorbent fermentation vats, adopt 0.1mol/L H
2sO
4regulate its pH to 2, carry out Aerated stirring adsorption reaction, detect at any time chromium content in waste water, up to standard after, the delivery port of the false end of taper of opening wheat bran fermentation vat carries out emission compliance waste water; Close subsequently delivery port, inject the chromium that new chromate waste water adsorbs waste water again, until wheat bran adsorbent is saturated for 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, in combustion ashes, inoculate after Aureobasidium pullulans cell liquid 5% heap fermented and cultured 12d, heavy metal chromium enters fermentation and oozes out in solution, thereby reclaims and isolate chromium in combustion ashes, and the heap fermentation lime-ash of isolating chromium fertilizes the soil as biological organic fertilizer auxiliary material.
Claims (6)
1. a preparation method for Aureobasidium pullulans solid state fermentation wheat bran adsorbent, concrete steps are as follows:
(1) pretreatment of wheat bran
1. after 60 ℃ of oven dry of wheat bran, pulverize, cross respectively 100 orders and 40 order sub-sieves, get respectively 100 orders and 40 order sub-sieve lower parts of screen and divide with the ratio of 1: 3 and mix;
2. the preparation of nutritive water: 0.1%NaH
2pO
4, 0.1%MgSO
4, the HCl solution that 0.01%VB1 is 0.1mol/L by concentration is adjusted pH to 6.0;
3., after getting and pulverizing wheat bran mixture and mix with the ratio of 1: 1.5 (m/v) with nutritive water, in 121 ℃ of boiling 0.5h, obtain wheat bran pretreatment thing;
(2) fermentation of wheat bran adsorbent preparation
Pack the wheat bran pretreatment thing obtaining in (1) into fermentation vat, and inoculate 5～10% Aureobasidium pullulans somatic cells (m/m), after 20～25 ℃ of fermentation 1～3d, by material-water ratio 1: 0.25 (m/v), in wheat bran fermentation vat, supplement the nutrients after water, be warmed up to 25～30 ℃, then obtain wheat bran adsorbent after the 3～5d that ferments.
2. a method of utilizing wheat bran adsorbent Adsorption heavy metals in industrial wastewater chromium ion described in claim 1, described method comprises: the waste water containing chromium is injected to wheat bran adsorbent fermentation vat, the ratio of 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 in waste water chromium content 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: wheat bran fermentation vat that waste water is injected continuously or is in batches processed the heavy metal wastewater thereby containing chromium, saturated to the absorption of wheat bran adsorbent.
4. method as claimed in claim 2, is characterized in that described method comprises: wheat bran fermentation vat has delivery port of the false end of taper, after heavy metal wastewater thereby detection is up to standard, opens delivery port and carries out waste discharge, reclaims containing heavy metal wheat bran.
5. a wheat bran that fully utilizes Adsorption of Heavy Metals chromium ion and reclaim the method for chromium, it is characterized in that: have the wheat bran adsorbent of heavy metal chromium to reclaim absorption, after pressing dry, for combustion power generation and reclaim heavy metal chromium, the lime-ash of isolating chromium fertilizes the soil as fertilizer auxiliary material.
6. method as claimed in claim 5, 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, in combustion ashes, inoculate after Aureobasidium pullulans cell liquid 5～10% (volume/lime-ash quality of cell liquid) heap cultivation 10～20d, heavy metal chromium enters in solution, thereby in combustion ashes, reclaim and isolate chromium, the heap fermentation lime-ash of isolating chromium fertilizes the soil as biological organic fertilizer auxiliary material.
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| CN111793565A (en) * | 2019-04-09 | 2020-10-20 | 黑龙江省福林环保科技有限公司 | ABS microbial agent for sewage treatment and preparation method thereof |
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| CN109201006A (en) * | 2018-09-03 | 2019-01-15 | 中成未来新材料（福建）有限公司 | A kind of environmental-protection adsorption material and preparation method thereof based on burning ash |
| CN111793565A (en) * | 2019-04-09 | 2020-10-20 | 黑龙江省福林环保科技有限公司 | ABS microbial agent for sewage treatment and preparation method thereof |
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