KR-102961266-B1 - Pellet-type biochar adsorbent for heavy metal removal and manufacturing method thereof

Abstract

A pellet-type biochar adsorbent for heavy metal removal and a method for manufacturing the same, and a method for manufacturing a pellet-type biochar adsorbent for heavy metal removal, are characterized by comprising: a) a step of manufacturing a pellet adsorbent by mixing powder-type biochar, alginic acid, and distilled water and molding them into a pellet type; and b) a step of manufacturing a modified adsorbent by modifying the pellet adsorbent with chitosan. According to this, a biochar adsorbent for treating heavy metal contaminated water is provided by utilizing biochar, which can be used as an eco-friendly purification material; pelletization facilitates utilization, recovery, and handling when applied to water treatment; and in particular, water treatment performance can be improved by increasing treatment efficiency through modification.

Inventors

• 정헌회
• 강광남
• 허문수
• 김지은

Assignees

• 에이티이 주식회사

Dates

Publication Date

20260511

Application Date

20221216

Claims (4)

1. a) A step of manufacturing a pellet adsorbent by mixing powdered biochar, alginate, and distilled water and molding them into a pellet type; b) a step of manufacturing a modified adsorbent by modifying the above-mentioned pellet adsorbent with chitosan; comprising, Step a) above is, a1) A step of obtaining a mixture by mixing 80~120g of powdered biochar and 30~50g of alginate per 1L of distilled water; a2) A step of extruding the above mixture through a nozzle to form it into a pellet shape to obtain a pellet molded product; a3) A step of immersing the above-mentioned pellet molded product in a 4.5~5.5% calcium chloride solution for a predetermined period of time to harden the pellet molded product; a4) A cutting step in which the pellet molded product cured through step a) above is washed with distilled water and cut to a predetermined length according to a certain standard; a5) A drying step of drying the pellet molded product cut through the above step a4) at a temperature of 65 to 75°C for 22 to 26 hours; comprising, The above step b) is, b1) A step of immersing the above-mentioned pellet adsorbent in a chitosan solution mixed with 60 ml of 2% acetic acid solution per 1 g of chitosan for 4 to 6 minutes; b2) A step of drying the pellet adsorbent obtained from step b1) at 65~75℃ for 22~26 hours; b3) A step of immersing the pellet adsorbent obtained from step b2) in a 1.2% caustic soda solution for 25 to 35 minutes; b4) a step of drying the pellet adsorbent obtained from step b3) at 65 to 75°C for 22 to 26 hours; characterized by comprising a method for manufacturing a pellet-type biochar adsorbent for heavy metal removal.
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4. A pellet-type biochar adsorbent manufactured by the adsorbent manufacturing method described in claim 1.

Description

Pellet-type biochar adsorbent for heavy metal removal and manufacturing method thereof The present invention relates to a pellet-type biochar adsorbent for heavy metal removal and a method for manufacturing the same, wherein the biochar adsorbent is manufactured using biochar to remove heavy metal contaminants contained in water, such as groundwater and surface water, and is improved by forming the adsorbent into pellets so that it is easy to handle, simple to apply and recover, and has improved treatment efficiency for heavy metal contaminants. In general, soil contaminated with oil and heavy metals leads to groundwater contamination, requiring consequent groundwater and water treatment. In particular, among these various pollutants, heavy metals such as copper and lead are toxic substances harmful to the human body and ecosystems, necessitating appropriate treatment. Various biological and physical/chemical treatment processes are being applied for this purpose; among these, methods using adsorbents primarily utilize expensive activated carbon adsorbents due to the advantages of simple facilities and convenient maintenance. Meanwhile, biochar is a material obtained by thermally decomposing biomass, and recently, the development of biochar utilizing various types of biomass is actively underway. However, these biochars differ in composition and adsorption capacity depending on the biomass used. To homogenize this, the thermal decomposition temperature and time are set as manufacturing conditions, or reactivity with specific substances is increased through modification. However, most of these biochars are manufactured and released in the final powder form, which has disadvantages such as difficulties in utilization and adsorbent recovery for water treatment applications; furthermore, the treatment efficiency of heavy metal pollutants during water treatment has not been satisfactory. FIG. 1 is a block diagram showing a method for manufacturing a pellet-type biochar adsorbent for heavy metal removal according to one embodiment of the present invention, and FIG. 2 is a photograph showing the step-by-step state of the process in which powdered biochar is manufactured into a modified biochar adsorbent in a method for manufacturing a pellet-type biochar adsorbent for heavy metal removal according to one embodiment of the present invention, and FIG. 3 is a block diagram specifically illustrating the manufacturing process of molding the pellet adsorbent of FIG. 1, and FIG. 4 is a schematic diagram showing the pellet adsorbent modification process of FIG. 1, and Figure 5 is a block diagram specifically illustrating the pellet adsorbent modification process of Figure 1. The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the invention is sufficiently conveyed to those skilled in the art. In describing the specific embodiments below, various specific details have been included to explain the invention more specifically and to aid understanding. However, a reader with sufficient knowledge in the art to understand the invention will recognize that it can be used without these various specific details. In some cases, it is noted in advance that commonly known aspects that are not significantly related to the invention have been omitted to prevent unnecessary confusion in describing the invention. Hereinafter, with reference to the drawings, a method for manufacturing a pellet-type biochar adsorbent for heavy metal removal according to an embodiment of the present invention and a pellet-type biochar adsorbent manufactured thereby will be described. The method for manufacturing a pellet-type biochar adsorbent according to the present invention is configured to include a step (s10) of manufacturing a pellet adsorbent and a step (s20) of manufacturing a modified adsorbent by modifying the manufactured pellet adsorbent with chitosan. The pellet adsorbent manufacturing step (s10) is configured to manufacture a pellet adsorbent by mixing powder-type biochar and alginic acid in distilled water, molding the mixed biochar mixture into a pellet type, and drying it. Specifically, the pellet adsorbent manufacturing step (s10) is configured to include a step of mixing materials to make a biochar mixture (s11), a step of molding the biochar mixture into a pellet shape (s12), a step of curing the molded pellet (s13), a step of washing and cutting the cured pellet (s14), and a step of drying the cut pellet to complete the pellet adsorbent (s15). The step of mixing materials (s11) is configured to obtain a biochar mixture by mixing 8