Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof

An adsorbent and waste water technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of pollution-prone environment treatment cost, limit practical use, limit application, etc., to achieve The effect of low processing cost, convenient operation and low cost

Inactive Publication Date: 2014-02-19
射阳县芦苇开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wheat bran contains a large number of functional groups such as cellulose and protein, which can be used to adsorb or complex heavy metal ions, but its adsorption capacity is very small, which limits its practical use in industry; researchers have carried out research on wheat bran Modification research, or activation to prepare activated carbon, increase its specific surface area, thereby increasing its adsorption capacity, but such modifications are all treated with acid and alkali, which are easy to pollute the environment and have high processing costs, which limits its use in industry. Applications

Method used

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  • Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof
  • Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof
  • Method for preparing bio-adsorbent for chromium-containing wastewater treatment and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Unfermented wheat bran is to Cr 6+ Study on Adsorption Effect

[0028] 1. Pretreatment of wheat bran

[0029] Wheat bran was dried and pulverized at 60°C, sieved through a 40-mesh sieve, and mixed with 0.1mol / L H 2 SO 4 Adjust the pH to the desired value with NaOH solution, and adjust the concentration of the wheat bran liquid to the desired concentration, and keep it warm at 121°C for 0.5h.

[0030] 2. Adsorption treatment method

[0031] The initial concentration of 100ml is 300mg / L Cr 6+ The solution was placed in a 250ml Erlenmeyer flask with 0.1mol / L H 2 SO 4 and NaOH to adjust its pH to 1.0, 2.0, 3.0, 3.8, 4.7, 5.9 and 7.0, add 10, 20, 30, 40, 50, 60g / L wheat bran, and place the temperature at 25, 30, 35, 40 Carry out oscillation adsorption reaction at 150rpm in a water bath constant temperature oscillator at 45°C, filter after 0.25, 0.5, 1, 1.5 and 2h respectively, pipette a certain amount of supernatant, dilute them by 100 times, and measure ...

Embodiment 2

[0047] Example 2 Study on the adsorption effect of Aureobasidium pullulans to heavy metals

[0048] 1. Preparation of culture medium

[0049] Strain activation medium (g / L): potato 200 sucrose 20 peptone 5 agar powder 20pH natural distilled water 1000mL 0.103MPa sterilized for 20min;

[0050] Seed medium (g / L): sucrose 50, Na 2 HPO 4 5.0, yeast extract 3.0, MgSO 4 ·7H 2 O0.2, (NH 4 ) 2 SO 4 0.6, NaCl0.1, pH6.0, distilled water 1000mL, 0.103Mpa, sterilization for 20min;

[0051] Fermentation medium (g / L): sucrose 50, Na 2 HPO 4 5.0, yeast extract 2.0, MgSO 4 ·7H 2 O0.4, (NH 4 ) 2 SO 4 0.6, NaCl0.1, pH6.5, distilled water 1000mL, 0.103MPa, sterilization for 20min.

[0052] 2. Preparation method of Aureobasidium pullulans

[0053] The activated bacteria were inoculated into fresh fermentation medium with an inoculum amount of 2%, and the pH was controlled at 6.0, 30° C., and 150 r / min shake flask cultured for 4 days. Centrifuge at 10,000 r for 5 min to collect th...

Embodiment 3

[0066] Example 3 Study on the adsorption effect of solid-state fermented wheat bran by Aureobasidium pullulans on heavy metals

[0067] 1. Preparation of culture medium

[0068] Strain activation medium (g / L): with embodiment 2;

[0069] Seed culture medium (g / L): with embodiment 2;

[0070] 2. Method for preparing adsorbent by solid-state fermentation of wheat bran by Aureobasidium pullulans

[0071] (1) Wheat bran is dried at 60°C and pulverized, passed through 100-mesh and 40-mesh sampling sieves respectively, and mixed with the lower part of 100-mesh and 40-mesh sampling sieves at a ratio of 1:3;

[0072] (2) Preparation of nutrient water: 0.1% NaH 2 PO 4 , 0.1% MgSO 4 , 0.01% VB1, adjust the pH to 6.0 with a HCl solution with a concentration of 0.1mol / L;

[0073] (3) After mixing the pulverized wheat bran mixture and nutrient water at a ratio of 1:1.5 (m / v), cooking at 121° C. for 0.5 h to obtain a pretreated wheat bran;

[0074] (4) Put the prepared wheat bran pre...

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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 [0001] The invention relates to the technical field of the preparation of biosorbent and the treatment of heavy metal pollutants in industrial waste water, in particular to a preparation method of Aureobasidium pullulans fermented wheat bran adsorbent and its application in the treatment of chromium-containing waste water. Background technique [0002] Toxic heavy metals in the air, water and soil, such as chromium manganese, are becoming a serious threat to the environment, which is gradually becoming a global problem, so the effective removal and separation of toxic heavy metal ions related to the environment has become a challenging work . At present, there are three main types of heavy metal wastewater treatment methods in various countries in the world: the first type is the method of removing heavy metal ions in wastewater through chemical reactions, including neutralization precipitation method, sulfide precipitation method, ferrite co-precipitation me...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 余晓红李锋申玉香李凤伟薛峰彭英云
Owner 射阳县芦苇开发有限公司
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