Heavy metal wastewater treatment agent derived from camellia oleifera seed industrial chain and application thereof

Abstract

This invention belongs to the field of heavy metal ion pollution treatment technology, specifically disclosing a heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application. The formula for removing heavy metal ions from wastewater includes the following components: 20-30 parts pH buffer, 1-4 parts camellia seed product, 1-4 parts Bacillus subtilis, and 2-7 parts flocculant / adsorbent. This invention provides a solution for removing heavy metal ions from wastewater, which, through the synergistic effect of the components, effectively removes heavy metal ions from wastewater, bringing them to national standards. Furthermore, the wastewater heavy metal ion treatment agent disclosed in this invention has the characteristics of high removal efficiency and good economic benefits, and it is biodegradable after use, without causing secondary pollution to the treated environment.

Description

Technical Field

[0001] This invention is applied to the field of heavy metal pollution treatment technology, and relates to the environmental protection treatment of heavy metal wastewater, particularly to a heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application. Background Technology

[0002] With the continuous acceleration of industrialization, heavy metal ions Ni 2+ Cr 3+ Cu 2+ and Pb 2+ Pollutants such as heavy metals are discharged into water bodies or soil, causing ecosystem damage. These discharged heavy metal ions are highly toxic and persistent pollutants that can accumulate in the human body through the food chain, leading to cellular disorders, protein denaturation, and tissue cancer, thus directly threatening human health. Currently, methods for removing heavy metal ions from wastewater mainly include ion exchange, chemical sedimentation, and membrane filtration. However, these methods have disadvantages such as high energy consumption, complex operation, and the potential for secondary environmental pollution. In contrast, adsorption methods, due to their low cost, simple operation, and high efficiency, are gradually attracting the attention of researchers.

[0003] Tea saponin is a natural glycoside compound extracted from the tea seed meal, tea seed powder, or tea cake of camellia oleifera seeds. Its molecular structure includes a hydrophobic aglycone, a hydrophilic sugar, and an organic acid. The hydroxyl groups in its molecule have strong complexing and reducing properties, enabling it to adsorb heavy metal ions from water or soil, and can also remove Cr... 6+ Reduced to Cr 3+ Secondly, tea saponin has the advantages of being abundant, green, inexpensive, and easily degradable, making it an excellent nonionic surfactant for removing heavy metal ions from wastewater. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, in order to solve the problems of high cost, easy secondary pollution, high energy consumption, and complex operation of existing heavy metal ion wastewater treatment solutions.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, comprising the following raw materials in parts by weight.

[0007] 20-30 parts pH buffer, 1-4 parts camellia seed product, 1-4 parts Bacillus subtilis, and 2-7 parts flocculant adsorbent.

[0008] Preferably, the heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application include the following steps:

[0009] (1) Take 100 mL of industrial wastewater and prepare a mixed solution containing multiple heavy metal ions in a beaker, and adjust the pH to 6-8 with 2-10 g of pH buffer.

[0010] (2) Add 1-3 parts of camellia seed product, 2-8 parts of flocculant, and 1-3 parts of Bacillus subtilis to the prepared wastewater, respectively, and control the concentrations of camellia seed product, flocculant, and Bacillus subtilis to 5-30 mg / L, 2-50 mg / L, and 5-40 mg / L, respectively. Stir continuously in a magnetic stirrer (500-3000 rpm) for 2-5 h, then filter to separate the precipitate. Take the supernatant for a second experiment to remove heavy metal ions.

[0011] (3) Adjust the pH of the obtained supernatant to 6-8 again using pH buffer, add the same concentration of camellia seed product (5-30 mg / L), flocculant (2-50 mg / L) and Bacillus subtilis (5-40 mg / L), stir in a magnetic stirrer at 500 rpm for 2-5 h, filter the precipitate, and take the supernatant to test the residual heavy metal ion concentration and COD concentration.

[0012] This invention discloses a heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application. Compared with existing technologies, this invention uses pH buffers, camellia seed products, flocculants, and Bacillus subtilis as raw materials, and can efficiently treat Cu in wastewater. 2+ Ni 2+ Pb 2+ Cr 3+ The method effectively adsorbs and treats heavy metal ions. Furthermore, the raw materials used in the solution provided by this invention decompose naturally, preventing secondary pollution to the environment and effectively protecting ecological safety and human health. Attached Figure Description

[0013] Figure 1 It is the initial concentration of heavy metal ions in the experimental wastewater.

[0014] Figure 2 It is the concentration of heavy metal ions in the experimental wastewater after secondary treatment.

[0015] Figure 3 It compares the treatment efficiency of heavy metal ions in experimental wastewater with the COD concentration before and after treatment. Detailed Implementation

[0016] The technical solutions in the implementation of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0018] All ingredients used in the formulations of this invention were purchased through commercial channels.

[0019] The wastewater in this embodiment of the invention originates from wastewater from the printed circuit board (PCB) industry and electroplating plants, and is formulated into a mixed solution containing a variety of heavy metal ions based on this wastewater.

[0020] Example 1

[0021] Weigh 20 parts of sodium bicarbonate from the prepared wastewater and adjust the pH. Then add 1 part of tea saponin, 1 part of Bacillus subtilis, and 1 part of acid-soluble chitosan in sequence. Mix and stir at 1000 rpm for 2 hours, filter and precipitate. Take the supernatant and add the same amount of tea saponin, Bacillus subtilis, and acid-soluble chitosan for a second treatment.

[0022] Example 2

[0023] Weigh 20 parts of sodium bicarbonate from the prepared wastewater and adjust the pH. Then add 1 part of tea saponin, 1 part of Bacillus subtilis, and 2 parts of acid-soluble chitosan in sequence. Mix and stir at 1000 rpm for 2 hours, filter and precipitate. Take the supernatant and add the same amount of tea saponin, Bacillus subtilis, and acid-soluble chitosan for a second treatment.

[0024] Example 3

[0025] Weigh 20 parts of sodium bicarbonate from the prepared wastewater and adjust the pH. Then add 1 part of tea saponin, 1 part of Bacillus subtilis, and 3 parts of acid-soluble chitosan in sequence. Mix and stir at 1000 rpm for 2 hours, filter and precipitate. Take the supernatant and add the same amount of tea saponin, Bacillus subtilis, and acid-soluble chitosan for a second treatment.

[0026] Example 4

[0027] Weigh 20 parts of sodium bicarbonate from the prepared wastewater and adjust the pH. Then add 1 part of tea saponin, 1 part of Bacillus subtilis, and 4 parts of acid-soluble chitosan in sequence. Mix and stir at 1000 rpm for 2 hours, filter and precipitate. Take the supernatant and add the same amount of tea saponin, Bacillus subtilis, and acid-soluble chitosan for a second treatment.

[0028] In this invention, the added tea saponin, as a component of the high-performance composite adsorption material, is mainly responsible for the specific removal of wastewater containing cadmium, copper ions, etc.

[0029] Sodium bicarbonate increases the pH value, creating alkaline conditions for subsequent precipitation and also softening the water.

[0030] Acid-soluble chitosan strongly adsorbs residual low-concentration heavy metal ions through mechanisms such as coordination of functional groups such as amino groups on the molecular chain and ion adsorption. Technical effect

[0031] Prepare Cu 2+ The concentration was 1712.38 mg / L, Ni 2+ The concentration was 468.27 mg / L, Co 2+ The concentration was 644.53 mg / L, Pb 2+ The concentration was 496.57 mg / L, Cr 3+ Simulated wastewater with a concentration of 442.31 mg / L was treated using the formulations described in Examples 1-4. After adsorption by stirring at 1000 rpm for 2 hours, the supernatant was collected and subjected to secondary treatment using the same formulations. The ion concentration in the wastewater was then measured, and the removal rates of various heavy metal ions in the treated simulated wastewater were calculated. The results are as follows: Figure 1-3 As shown.

[0032] Depend on Figure 1-3 As can be seen, this invention uses tea saponin as the main component and employs different formulations to treat simulated wastewater. After two consecutive treatments, the removal rate of heavy metal ions can reach over 99%. Its mechanism of action lies in the fact that tea saponin can significantly enhance the surface adsorption performance of inorganic minerals, thereby strengthening the adsorption and removal effect of heavy metal ions in wastewater. Simultaneously, the treatment agent described in this invention also exhibits excellent COD removal performance.

[0033] The tea saponin used in this invention is readily biodegradable, enabling the resource utilization of the camellia seed industry chain and turning waste into treasure. Furthermore, the raw materials used in the solution provided by this invention are natural, environmentally friendly, and biodegradable with zero secondary pollution, resulting in significant social and environmental benefits.

[0034] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, characterized in that, The raw materials include the following parts by weight: 20-30 parts pH buffer, 1-4 parts camellia seed product, 1-4 parts Bacillus subtilis, and 2-7 parts flocculant and adsorbent.

2. The heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application as described in claim 1, characterized in that... The camellia seed products include one or more of tea meal, tea seed powder, tea seed cake, and tea saponin.

3. The heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application as described in claim 1, characterized in that... The wastewater treatment method includes the following steps: After adjusting the pH of the wastewater to 6-9, camellia seed products, acid-soluble chitosan, and Bacillus subtilis were added separately, and the mixture was continuously stirred at 500-3000 rpm for 2-5 hours. After sedimentation and separation, the supernatant was collected and subjected to multiple reaction treatments.

4. The heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application as described in claim 1, characterized in that... The pH buffer includes one or more of sodium bicarbonate and sodium carbonate.

5. The heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application as described in claim 1, characterized in that... The flocculant adsorbent includes one or more of acid-soluble chitosan, sodium alginate, and plant tannins.

6. A heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, as described in claim 3, is characterized in that... The wastewater is treated 1-3 times.

7. A heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, as described in claim 4, is characterized in that... The mass ratio of sodium bicarbonate to sodium carbonate is 1-10: 3-5.

8. A heavy metal wastewater treatment agent derived from the camellia seed industry chain and its application, as described in claim 5, is characterized in that... The mass ratio of the acid-soluble chitosan, sodium alginate, and plant tannins is 2-4: 1-2: 1-2.

9. An application for treating wastewater containing heavy metal ions or organic wastewater as described in any one of claims 1 to 8.

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