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Biological absorbent used for treating heavy metal wastewater and application of biological absorbent

A biosorbent and heavy metal technology, applied in the direction of microorganism-based methods, microorganisms, biological water/sewage treatment, etc., can solve the problems of different adsorption effects of metal ions, high production cost of biosorbents, complicated preparation process, etc., to achieve Enhanced adsorption of heavy metal ions, uniform spherical size, and high chitin content

Active Publication Date: 2016-07-06
北京长兴泰华科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the traditional adsorption method, the biosorption method has the following advantages: 1) metals can be selectively removed at low concentrations; 2) energy saving, high treatment efficiency; 3) easy separation and recovery of heavy metals; Adsorbents are easy to regenerate and use, and biological cells need to be immobilized, which increases the cost of biosorbent production
[0004] Because the cell wall of fungal organisms contains a large amount of chitin and other glucans such as mannan, galactose and glucosamine, etc., during the heavy metal adsorption process, the functional groups on the cell surface—COOH,—NH2,—OH can interact with The combination of metal ions, so as to achieve the purpose of adsorption of metal ions, among which, the strains of Rhizopus have good adsorption effect on most metals, and Rhizopus oryzae has the advantages of high chitin content in the cell wall and other advantages. One of the options, the patent 201310482555.X chooses Rhizopus oryzae as the adsorbent, reacts with the mixed iron salt solution, adds Zizania leaf powder and curing agent to prepare a magnetic biosorbent, and uses the inactivated bacteria as the biological adsorbent. The raw material of the adsorbent, in addition, the preparation process is complicated
[0005] It has been reported in the literature that mold mycelium balls of uniform size can remove metal ions in wastewater very well. Although mold itself has the characteristics of forming balls, affected by environmental conditions, mycelium aggregates may present different shapes, such as uniform Mycelium balls, flocculent mycelium, irregular mycelium clusters, etc., so it is not easy to obtain the ideal shape of the bacteria with good repeatability and parallelism. In addition, the rice roots obtained under different fermentation conditions The content of chitin in the mold is different, which makes the adsorption effect of metal ions in wastewater different

Method used

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  • Biological absorbent used for treating heavy metal wastewater and application of biological absorbent
  • Biological absorbent used for treating heavy metal wastewater and application of biological absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A biosorbent for treating heavy metal wastewater is prepared by the following method:

[0022] 1) Preparation of corn flour hydrolyzate: A) pulverizing commercially available corn flour to obtain micro corn flour with an average particle diameter of 800 microns; B) mixing micro corn flour and water into a paste at a ratio of 180%, Heat to 40-70°C, add amylase and plant protease, the amylase enzyme amount is 1300U / g micro corn flour, the amount of plant protease is 0.15wt% of micro corn flour, and then pass through 800-1000 mesh screen while it is hot Filtrate to obtain a uniform filtrate, add water to adjust the sugar content after the filtrate is cooled, and make a total sugar of 30g / L corn flour hydrolyzate, the gained corn flour hydrolyzate is composed of corn flour hydrolyzate clear liquid and corn flour hydrolysis residue particles, the corn flour The weight ratio of the hydrolyzed clear liquid to the cornflour hydrolyzed granules is 90-95:5-10;

[0023] 2) Prepar...

Embodiment 2

[0025] A method for preparing a biosorbent for treating heavy metal wastewater, which is prepared by the following method:

[0026] 1) Preparation of degerm corn flour hydrolyzate: A) pulverize commercially available degerm corn flour to obtain micro-degerm corn flour with an average particle diameter of 500 microns; B) mix micro-degerm corn flour with water at 150% After mixing into a paste, heat to 40-70°C, add amylase and plant protease, the amount of amylase added is 1200U / g micro-degerminated corn flour, and the amount of plant protease is 0.1wt of micro-degerminated corn flour %, and then filtered through a 800-1000 mesh screen while it was hot to obtain a uniform filtrate. After the filtrate was cooled, water was added to adjust the sugar content to make a total sugar of 30g / L corn flour hydrolyzate. Flour hydrolyzed clear liquid and degerminated corn flour hydrolyzed residue granules, the weight ratio of degermed corn flour hydrolyzed clear liquid to degermed corn flou...

Embodiment 3

[0029] A method for preparing a biosorbent for treating heavy metal wastewater, which is prepared by the following method:

[0030]1) Preparation of cassava flour hydrolyzate: A) commercially available cassava flour is pulverized to obtain micro-cassava flour with an average particle diameter of 1000; 40-70 DEG C, add amylase and plant protease, amylase added enzyme amount is 1500U / g micro-tapioca flour, the consumption of plant protease is 0.2wt% of micro-tapioca flour, then pass through 800-1000 mesh screen filter while hot, Obtain uniform filtrate, add water to adjust sugar content after filtrate cooling, make total sugar be 30g / L cassava flour hydrolyzate, gained cassava flour hydrolyzate is made up of cassava flour hydrolyzed clear liquid and corn flour hydrolyzed residue particles, described cassava flour hydrolyzed clear liquid The weight ratio of liquid to cassava flour hydrolyzed particles is 90-95:5-10;

[0031] 2) Preparation of Rhizopus oryzae mycelium balls: take...

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Abstract

The invention discloses a method for treating heavy metal wastewater. The method comprises the following steps: 1) immobilizing pseudomonas pseudoalcaligenes and saccharomyces cerevisiae mixed bacteria collected after mixed fermentation culture into immobilized cell spheres of which the appearance is spherical and the interior is of a porous meshed structure; 2) taking starch raw material hydrolysate as a culture medium, inoculating rhizopus oryzae spore suspension under the condition that the pH value is equal to 3-6, performing shaking culture for 24-48 hours, filtering and collecting to obtain rhizopus oryzae mycelium pellets of which the diameter is 50-100 microns; 3) filling the immobilized cell spheres and the rhizopus oryzae mycelium pellets in a biological adsorber, wherein the biological adsorber is formed by connecting a plurality of adsorbing columns in series; 4) regulating the initial heavy metal ion concentration of the heavy metal wastewater to be less than or equal to 800 mg / L, and allowing the wastewater to flow through the biological adsorber after the pH value is equal to 5-7, wherein the hydraulic retention time in each adsorbing column is 0.5-1 hour. By utilization of different types of microbial viable bacteria, different heavy metals (such as Cd<2+>, Hg<2+>, Cu<2+>, Zn<2+>, Ni<2+>, Ag<2+> and Pb<2+>) can be well adsorbed under the effects of different adsorption mechanisms.

Description

technical field [0001] The invention belongs to a preparation method and application of a biological adsorbent for treating heavy metal wastewater. Background technique [0002] At present, there are three main types of heavy metal wastewater treatment methods: chemical reaction method, concentration separation method and biological adsorption method. The first category is the removal of heavy metal ions in wastewater through chemical reactions, including neutralization precipitation, sulfide precipitation, ferrite co-precipitation, chemical reduction, electrochemical reduction, and polymer heavy metal collectors; The second category is the method of concentrating and separating heavy metals in wastewater without changing their chemical form, including adsorbent adsorption, ion exchange and membrane separation; the third category of biosorption is a new development this year. The heavy metal sewage treatment method uses microorganisms and their derivatives to absorb heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C12P19/14C12P19/00C12N1/14C12R1/845
CPCC02F3/34C12N1/14C12P19/00C12P19/14
Inventor 洪寅
Owner 北京长兴泰华科技发展有限公司
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