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Preparation of alkali-modified biochar and application of alkali-modified biochar in removal of emerging pollutants in sewage

A biochar, alkali modification technology, applied in the field of environmental protection and comprehensive utilization of waste resources, can solve the problems of secondary pollution, high cost of treatment process, incomplete removal of emerging pollutants, etc., and achieves less secondary pollution and operation. Simple, low-cost effects

Inactive Publication Date: 2021-06-11
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the incomplete removal of existing emerging pollutants, as well as the current situation of high cost of treatment process, strict operation and easy to cause secondary pollution, so as to solve the problem that emerging pollutants bring greater risks to the environment and human health, A simple, efficient and economical method for the preparation of alkali-modified biochar, and a method for removing emerging pollutants in sewage by using the alkali-modified biochar

Method used

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  • Preparation of alkali-modified biochar and application of alkali-modified biochar in removal of emerging pollutants in sewage
  • Preparation of alkali-modified biochar and application of alkali-modified biochar in removal of emerging pollutants in sewage
  • Preparation of alkali-modified biochar and application of alkali-modified biochar in removal of emerging pollutants in sewage

Examples

Experimental program
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Effect test

preparation example Construction

[0078] figure 1 It is a schematic flow chart of the preparation process of alkali-modified biochar and the removal of emerging pollutants in sewage by using alkali-modified biochar in the present invention. Such as figure 1 As shown, the initial biochar was prepared by pyrolysis carbonization method, the initial biochar was impregnated with alkaline solution to prepare alkali-modified biochar, and then put into the sewage containing emerging pollutants and fully contacted by shaking, or the emerging pollutants The mixed solution creeps through the fixed bed column filled with alkali-modified biochar, and the emerging pollutants in the above two methods will be adsorbed on the surface or pores of the biochar, achieving a good removal effect.

[0079] Among them, the pyrolysis operating conditions of the tube furnace are heating temperature of 700°C and heating time of 2 hours.

Embodiment 1

[0080] The preparation of embodiment 1 alkali-modified biochar

[0081] First, clean the collected wheat straw with ultrapure water, dry it in an oven at 80°C for 24 hours, cut the dry straw into small pieces of about 2 cm, put them in a quartz crucible, wrap them in aluminum foil, and place them in a tube furnace. Under the atmosphere, heat up to 700°C at a heating rate of 10°C / min, hold for 2h, then stop heating, and keep the nitrogen atmosphere until the tube furnace cools down to room temperature, turn off the nitrogen switch and the electric furnace power supply, take out the crucible and seal it for storage, and obtain the described initial biochar. Then the initial biochar was ground with an agate mortar and passed through a 120-mesh sieve to obtain initial biochar powder (BC). Weigh 5g of initial biochar powder into a 50mL Erlenmeyer flask, slowly add 50mL of 1mol / L sodium hydroxide solution along the wall to ensure that the mass-volume ratio of initial biochar powder...

Embodiment 2

[0083] Embodiment 2 utilizes the static adsorption of alkali-modified biochar

[0084] In a 100mL glass bottle, the alkali-modified biochar NBC prepared in Example 1 of the present invention was put into sewage containing a single emerging pollutant (BPA, tetracycline TC, ofloxacin OFL, etc.). The specific implementation is to drop 200mg / L of alkali-modified biochar and 20mg / L of single pollutant into a glass bottle containing 50mL of sewage (to ensure that the mass ratio of alkali-modified biochar to emerging pollutants is 10:1), and then The glass bottle was placed in a shaker and oscillated at a speed of 180r / min for 70h to carry out the static removal experiment of pollutants.

[0085] image 3 is the effect of alkali-modified biochar on the removal of different emerging pollutants over time in the static adsorption method. It can be seen from the figure that the adsorption of NBC to OFL and BPA is rapidly saturated within 9 hours, and the adsorption to TC only reaches e...

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Abstract

The invention discloses alkali modified biochar and a preparation method thereof, and a method for removing emerging pollutants in sewage by using the modified biochar. The method comprises the following steps: preparing initial biochar by using a pyrolysis carbonization method, dipping the initial biochar in an alkaline solution, oscillating and fully contacting, washing with ultrapure water until the pH value is neutral, and carrying out suction filtration and drying to prepare the alkali modified biochar. Compared with the initial biochar, the alkali modified biochar prepared by the invention has larger specific surface area and stronger hydrophobicity, and has higher adsorption capacity and better removal effect on emerging pollutants bisphenol A and antibiotics (tetracycline TC, ofloxacin OFL and the like). Meanwhile, pollutants adsorbed on the alkali modified biochar are not easy to desorb, so that secondary pollution is avoided. In conclusion, emerging pollutants in sewage can be effectively removed, meanwhile, secondary pollution of the alkali-modified biochar after adsorption is little, and the method has the advantages of being easy to operate, efficient, environmentally friendly, capable of saving cost and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection and comprehensive utilization of waste resources, and relates to an alkali-modified biochar, a preparation method and an application for removing emerging pollutants in sewage. Background technique [0002] In recent decades, a large number of artificial or natural sources of compound pollutants have been newly discovered in the aquatic environment. These pollutants usually exist in trace concentrations (from ppt level to ppb level), and are mostly organic in nature. Known as "emerging pollutants" (EC). Major categories of EC include pharmaceuticals and personal care products, surfactants, plasticizers, pesticides, flame retardants, and nanomaterials, among others. Antibiotics and the endocrine-disrupting chemical bisphenol-A are often found in aquatic environments due to their high levels of use. [0003] In recent years, reports of antibiotics detected in water bodies have shown that EC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C10B53/02C02F1/28
CPCB01J20/20B01J20/3078B01J20/3085B01J2220/4825C02F1/283C10B53/02Y02E50/10
Inventor 谢冰汤烨崔玉雪李烨苏应龙
Owner EAST CHINA NORMAL UNIV
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