Modified rice straw stalk and preparation method and application thereof

A technology of rice straw and modification is applied in the environmental field to achieve the effects of reducing environmental pollution, enhancing adsorption capacity and increasing specific surface area.

Inactive Publication Date: 2015-11-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lignin tightly wraps cellulose and becomes a natural physical barrier to protect cellulose from microbial degradation, but it also becomes an obstacle in the process of cellulose utilization

Method used

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  • Modified rice straw stalk and preparation method and application thereof
  • Modified rice straw stalk and preparation method and application thereof
  • Modified rice straw stalk and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The preparation method of trace element liquid is:

[0043] Weigh 0.018g of CoCl 2 ·6H 2 O, 0.01g of CuSO 4 ·5H 2 O, 0.01g of ZnSO 4 ·7H 2 O, 0.01g of AlK(SO 4 ) 2 12H 2 O, 0.01g of Na 2 MoO 4 2H 2 O, 0.1g of MnSO 4 ·H 2 O, 0.3g of MgSO 4 ·7H 2 O, 0.1g of NaCl, 0.1g of FeSO 4 ·7H 2 O. 0.01g of HBO 3 and 0.01g of CaCl 2 , dissolved in 1 L of deionized water and adjusted to pH 4.5.

Embodiment 1

[0045] A modified rice straw of the present invention is prepared by the following preparation method:

[0046] (1) Break the rice straw through a sieve with a pore size of 2mm, wash it with deionized water, and dry it in an oven at 70°C; take 400g of dried rice straw, 1L of trace element solution, and 10mL of chrysosporium Solid-state fermentation is carried out after the Phaneroderma spore suspension is mixed, and the temperature is kept at 35° C. and the water content is 70% during the solid-state fermentation. After solid-state fermentation for 30 days, the fermented rice straw was taken out, washed with deionized water, put into an oven and dried at 70° C. to obtain fermented rice straw.

[0047] In the above step (1), the mass volume ratio of the dried rice straw and the trace element solution is 400g to 500g: 1L, and the volume ratio of the Phanerochaete chrysosporium spore suspension to the trace element solution is 0.01 to 0.015: 1, All can achieve the same or simila...

Embodiment 2

[0065] An application of the modified rice straw of the present invention in the treatment of cadmium-containing wastewater comprises the following steps:

[0066] (1) Take 5 copies of Cd 2+ 1L of industrial wastewater with a concentration of 300mg / L each, adjust the pH value to 2, 3, 4, 5, 6 with NaOH solution or HCl solution.

[0067] (2) Add 5 g of the modified rice straw stalks prepared in Example 1 to each of the above 5 parts of industrial waste water, and carry out vibration adsorption at a temperature of 20° C. and a rotating speed of 120 rpm. The straw is precipitated, and the supernatant is discharged to complete the analysis of Cd in industrial wastewater. 2+ adsorption treatment.

[0068] The supernatant was taken to determine the Cd in the wastewater after adsorption 2+ content, and the results are shown in Table 2.

[0069] Table 2: Cd in wastewater at different pH values 2+ removal efficiency

[0070] pH value

2

3

4

5

6

...

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Abstract

The invention discloses a modified rice straw stalk and a preparation method and an application thereof. The modified rice straw stalk is obtained by the steps of carrying out solid-state fermentation of rice straw stalk, a white-rot fungus spore suspension and a trace element liquid, then mixing with oxalic acid, and carrying out ultrasonic treatment and heating reaction. The preparation method includes the steps of solid-state fermentation and chemical treatment. The modified rice straw has high specific surface area and specific pore area, contains more -COO<-> groups, and can be applied to treatment of wastewater containing cadmium; an application method includes the following steps of mixing the modified rice straw stalk with the wastewater containing cadmium, and carrying out oscillation adsorption, wherein the mass volume ratio of the modified rice straw stalk to the wastewater containing cadmium is (5 g-6 g) to (1 L). The modified rice straw stalk has the advantages of high treatment efficiency, good treatment effect, environmental protection and no secondary pollution.

Description

technical field [0001] The invention relates to the field of environment, in particular to a biological treatment method for heavy metal wastewater, in particular to a modified rice straw, a preparation method thereof, and an application of the modified rice straw in treating cadmium-containing wastewater. Background technique [0002] Heavy metal pollution has become one of the important pollution problems facing the water environment. At present, most cities in my country have serious water quality problems to varying degrees. A large amount of untreated urban garbage, industrial wastewater and domestic sewage are discharged into the water body, making the water body The content of heavy metals increased sharply. Heavy metals cannot be biodegraded, on the contrary, they can be enriched by hundreds of times under the biomagnification of the food chain, and finally enter the human body. Heavy metals can strongly interact with proteins and enzymes in the human body, making th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 曾光明程敏黄丹莲赖萃刘洋危臻许飘张辰万佳黄超
Owner HUNAN UNIV
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