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Application of Modified Crop Straw to Adsorption of Low Concentration Oily Sewage

A crop straw, low-concentration technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., to achieve good adsorption, good adsorption, and improve adsorption effect.

Active Publication Date: 2021-05-11
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have tried to use a variety of adsorbents to adsorb and treat wastewater containing emulsified oil and dissolved oil, but finding cheap, efficient and excellent adsorbents is still a hot spot for researchers.

Method used

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  • Application of Modified Crop Straw to Adsorption of Low Concentration Oily Sewage
  • Application of Modified Crop Straw to Adsorption of Low Concentration Oily Sewage
  • Application of Modified Crop Straw to Adsorption of Low Concentration Oily Sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing modified crop straw, which is prepared by the following method:

[0034] S1. Removing surface wax: pulverize the rice straw sample with a pulverizer, soak in 1-2mol / L NaOH solution for 20-24h, wash with distilled water until neutral, and dry at 50-60°C;

[0035] S2. Hydrogen bond activation: use 50wt% H 3 PO 4 Soak in the solution for 20-24 hours, wash with distilled water until neutral, and dry at 50-60°C;

[0036] S3. Preparation of sodium cellulose: adding the activated straw powder into a 10-15mol / L NaOH solution, stirring and reacting for 2-4h, filtering and drying to obtain sodium cellulose;

[0037] S4. Modification: add long-chain monohalogenated alkanes to organic solvents, add cellulose sodium, react for 3-5 hours, filter, wash with distilled water, evenly spray 5wt% triethylamine, and dry at 50-60°C to obtain Modified cellulose;

[0038] Long-chain monohalogenated alkanes have the structure of formula I:

[0039]

[0040] Formul...

Embodiment 2

[0046] A method for preparing modified crop straw, which is prepared by the following method:

[0047] S1. Removing surface wax: pulverize the straw samples with a pulverizer, soak in 1-2mol / L NaOH solution for 20-24h, wash with distilled water until neutral, and dry at 50-60°C;

[0048] S2. Hydrogen bond activation: use 50wt% H 3 PO 4 Soak in the solution for 20-24 hours, wash with distilled water until neutral, and dry at 50-60°C;

[0049] S3. Preparation of sodium cellulose: adding the activated straw powder into a 10-15mol / L NaOH solution, stirring and reacting for 2-4h, filtering and drying to obtain sodium cellulose;

[0050] S4. Modification: add long-chain monohalogenated alkanes to organic solvents, add cellulose sodium, react for 3-5 hours, filter, wash with distilled water, evenly spray 5wt% triethylamine, and dry at 50-60°C to obtain Modified cellulose;

[0051] Long-chain monohalogenated alkanes have the structure of formula I:

[0052]

[0053] Formula I; ...

Embodiment 3

[0057] A method for preparing modified crop straw, which is prepared by the following method:

[0058] S1. Removing surface wax: pulverize the rice straw sample with a pulverizer, soak in 1-2mol / L NaOH solution for 20-24h, wash with distilled water until neutral, and dry at 50-60°C;

[0059] S2. Hydrogen bond activation: use 50wt% H 3 PO 4 Soak in the solution for 20-24 hours, wash with distilled water until neutral, and dry at 50-60°C;

[0060] S3. Preparation of sodium cellulose: adding the activated straw powder into a 10-15mol / L NaOH solution, stirring and reacting for 2-4h, filtering and drying to obtain sodium cellulose;

[0061] S4. Modification: add long-chain monohalogenated alkanes to organic solvents, add cellulose sodium, react for 3-5 hours, filter, wash with distilled water, evenly spray 5wt% triethylamine, and dry at 50-60°C to obtain Modified cellulose;

[0062] Long-chain monohalogenated alkanes have the structure of formula I:

[0063]

[0064] Formul...

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Abstract

The present invention proposes a preparation method of modified crop straw, which is prepared by the following method: S1. remove surface wax; S2. hydrogen bond activation: use H 3 PO 4 Soak in the solution, wash with distilled water until neutral, and dry; S3. Preparation of sodium cellulose: add the activated straw powder into a concentrated NaOH solution and stir for reaction, filter, and dry to obtain sodium cellulose; S4. Modification: Add chain-halogenated alkanes to organic solvents, add cellulose sodium, react, filter, wash with distilled water, and dry to obtain modified cellulose; S5. Carbonization: put the modified cellulose into a high-temperature resistance furnace for nitrogen protection at high temperature carbonization to obtain modified crop straw. The preparation method of the invention is simple, and the obtained modified crop straw has good adsorption property for oil in low-concentration oily sewage, and the pollution oil content after adsorption is reduced to 0.001-0.002%, which has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a modified crop straw, a preparation method thereof, and an application for adsorption of low-concentration oily sewage. Background technique [0002] Oily sewage is mainly produced in the process of oil extraction, refining, storage and transportation and related chemical production. Most of the oil in the sewage (slick oil and dispersed oil) can be basically removed after physical recovery and biochemical treatment, while a small amount of the remaining part (emulsified oil and dissolved oil) will still remain in the sewage. With the increasingly stringent environmental protection requirements, the treatment of this part of residual oil needs to be solved urgently. As an efficient treatment process for low-concentration organic wastewater, adsorption has attracted the attention of many researchers. Researchers have tried to use a variety of adsorbents to adsorb and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/32
CPCB01J20/20B01J2220/4825C02F1/283C02F2101/32
Inventor 刘梅陈庆国郝焱杨桥赵美璐
Owner ZHEJIANG OCEAN UNIV
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