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Method for removing cadmium ions in wastewater by utilizing chicken manure biological carbon to absorb

A cadmium ion, biochar technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc., to achieve the effect of eliminating fecal pollution, good adsorption effect, and preventing fecal pollution

Inactive Publication Date: 2019-06-14
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for removing cadmium ions in wastewater by using chicken manure biochar to absorb and remove cadmium ions. The technical problem to be solved is to prevent and eliminate fecal pollution and remove Cadmium ions in wastewater to achieve the purpose of "circular economy, energy saving, treating waste with waste, turning waste into treasure"

Method used

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  • Method for removing cadmium ions in wastewater by utilizing chicken manure biological carbon to absorb
  • Method for removing cadmium ions in wastewater by utilizing chicken manure biological carbon to absorb
  • Method for removing cadmium ions in wastewater by utilizing chicken manure biological carbon to absorb

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preparation example Construction

[0047] As preferably, the preparation method of described chicken manure biochar comprises the following steps:

[0048] (1) Pretreatment is carried out to chicken manure, and described pretreatment comprises impurity removal, natural air-drying, pulverizing, sieving and drying;

[0049] (2) in N 2 Under protection, the pretreated chicken manure is pyrolyzed to obtain chicken manure biochar.

[0050] In the above step (1), natural air-drying refers to collecting fresh chicken manure and air-drying naturally; impurity removal refers to the removal of impurities such as stones and feathers in chicken manure; sieving is to remove the crushed coarse particles, It is beneficial to the later pyrolysis, making it more fully pyrolyzed.

[0051] In the above step (2), in N 2 Under protection, put the chicken manure obtained in step (1) into a muffle furnace for pyrolysis, after the pyrolysis is completed, cool it to below 60°C, take out the obtained black solid product, and the prep...

Embodiment 1

[0073] The present embodiment provides a kind of preparation method of chicken manure biochar, it comprises the following steps:

[0074] (1) After the fresh chicken manure is removed from impurities, it is naturally air-dried in a ventilated place in the room, and passed through a 40-mesh sieve;

[0075] (2) put the material that step (1) obtains in the corundum crucible, and it is placed in the muffle furnace, under N 2 Carry out pyrolysis treatment under protection, the pyrolysis temperature is 200, 400, 600 and 800°C respectively, the pyrolysis time is 2h, the initial temperature is 60°C, and the heating time is 1h;

[0076] (3) After the depyrolysis is completed, cool to below 60° C., take it out, and obtain a black solid product, which is chicken manure biochar (BC);

[0077] (4) After the chicken manure biochar obtained in step (3) is collected, it is finely ground in a universal high-speed pulverizer, passed through a 100-mesh sieve, and stored. The basic element com...

Embodiment 2

[0091] Such as Figure 6-14 As shown, in this example, the chicken manure biochar with different pyrolysis temperatures obtained in Example 1 was used to carry out the heavy metal adsorption experiment.

[0092] Three batches of adsorption experiments were carried out using chicken manure biochar: adsorption kinetics study, isothermal adsorption study and pH effect study. By comparing the adsorption effects under different adsorption time, pH and adsorption temperature, the biochar with the best preparation temperature for heavy metal Cd(II) adsorption was screened out.

[0093] 1. Study on adsorption kinetics: Weigh 4g of chicken manure biochar with different pyrolysis temperatures into 1L beakers, add 1000mL of 200mol·L -1 Cd(II) with 0.01mol / L NaNO 3 As background electrolyte, use 0.1mol / L HNO 3 and NaOH to adjust the pH of the Cd(II) solution to 5.0; samples were taken within the specified time, and the concentration of Cd(II) in the filtrate was measured.

[0094] The...

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Abstract

The invention relates to a method for removing cadmium ions in wastewater by utilizing chicken manure biological carbon to absorb. The method comprises the following steps: After grinding and sievingthe chicken manure biological carbon, mixing with wastewater containing the cadmium ions; regulating the pH (Potential of Hydrogen) value and absorbing, wherein the chicken manure biological carbon isobtained by carrying out high-temperature pyrolysis on chicken manure under an oxygen-free condition. According to the method provided by the invention, the chicken manure is subjected to simple pre-treatment and then is pyrolyzed under the oxygen-free condition to obtain the chicken manure biological carbon. The method provided by the invention has the advantages of simple technology, wide raw material source, low cost, high safety, waste utilization and environment protection and the like. The chicken manure biological carbon prepared by the method is used for removing the cadmium ions in the wastewater; compared with other absorption materials, the chicken manure biological carbon has a good absorption effect on the cadmium ions in the wastewater and absorption balance can be realizedat room temperature within a short time.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for removing cadmium ions in wastewater by using chicken manure biochar to adsorb and remove cadmium ions. Background technique [0002] Cadmium (Cd) is a heavy metal with high biotoxicity and is a major pollutant in the environment. It can accumulate in the food chain and cause damage to human health, such as high blood pressure, anemia, bone and kidney damage caused by long-term exposure damage. Studies have shown that cadmium has the characteristics of refractory degradation, high toxicity, and easy accumulation, which will cause serious harm to the ecological environment and organisms. Therefore, it is crucial to remove the heavy metal cadmium ion Cd(II) from wastewater. In recent years, the removal of cadmium has received more and more attention. [0003] Manure treatment has always been one of the technical problems that modern chicken f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/20B01J20/30C02F101/20
Inventor 孙约兵闫翠侠徐应明迪娜·吐尔生江王农
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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