Method for removing lead in water body by using magnetic pig manure biochar

A technology for biochar and pig manure, which is applied in separation methods, chemical instruments and methods, water pollutants, etc. Quickly realize problems such as solid-liquid separation, and achieve the effects of controlling heavy metal pollution, reducing bioavailability, and strong alkalinity

Active Publication Date: 2018-05-29
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original biochar has the following problems in the actual use process: first, the specific surface area, pore volume and pore size of the original biochar are relatively small, and the removal efficiency of heavy metals is not high
Second, the reaction rate is slow and requires a long reaction time. Biochar can achieve adsorption equilibrium for heavy metals, and cannot effectively remove heavy metal pollution in water bodies.
Third, after the original biochar adsorbs heavy metals in water, it cannot quickly achieve solid-liquid separation and reduce secondary pollution; therefore, it is necessary to further study a modified biochar that can efficiently remove heavy metals in water. It can quickly achieve adsorption equilibrium, and at the same time quickly realize solid-liquid separation, reducing secondary pollution

Method used

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  • Method for removing lead in water body by using magnetic pig manure biochar
  • Method for removing lead in water body by using magnetic pig manure biochar
  • Method for removing lead in water body by using magnetic pig manure biochar

Examples

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Effect test

Embodiment 1

[0042] A kind of method utilizing magnetic pig manure biochar of the present invention to remove lead in water body comprises the following steps:

[0043] S1: First prepare magnetic pig manure biochar by the following method:

[0044] (1) Preparation of pig manure biochar: collect fresh pig manure, dry at 60°C to 10%-15%, pulverize, pass through a 100-mesh sieve, and seal and store for later use. Put the crushed and sieved pig manure into a tube furnace, feed in nitrogen, and pyrolyze at a high temperature. The heating rate is 8°C / min, the pyrolysis temperature is 500°C, and the pyrolysis residence time is 2h. Crushed and passed through a 100-mesh sieve to obtain pig manure biochar (BC).

[0045] (2) Preparation of pig manure biochar dispersion: Weigh 5g of pig manure biochar and add it to a beaker, add 50mL of ultrapure water to stir and disperse, the stirring speed is 800r / min, and the stirring time is 30min to obtain pig manure biochar Dispersions.

[0046] FeSO 4 ·7H ...

Embodiment 2

[0059] A method for removing lead in water using magnetic pig manure biochar of the present invention uses the magnetic pig manure biochar prepared in Example 1. This example investigates the effect of pH on the efficiency of magnetic pig manure biochar on lead treatment.

[0060] Take 0.01g of magnetic pig manure biochar in 10mL of 50mg / L lead-containing solution, and adjust the pH of the solution to 2, 3, 4, 5, 6, and 7 with 1M HCl and NaOH solutions. At 25°C and 180rpm, shake at constant temperature for 24h (5min or more than 4min is acceptable, as long as the adsorption equilibrium is reached). The treated solution is separated from solid and liquid under the action of an external magnetic field, and the supernatant is filtered through a filter with a pore size of 0.48 μm to obtain a filtrate. The untreated lead in the filtrate was measured with a flame atomic absorption spectrometer, and the treatment efficiency of the magnetic swine manure biochar under pH conditions was...

Embodiment 3

[0065] A method of using magnetic pig manure biochar to remove lead in water according to the present invention adopts the magnetic pig manure biochar prepared in Example 1. This example investigates the effect of the initial concentration of lead on the magnetic pig manure biochar on the lead treatment efficiency .

[0066]0.01g of magnetic pig manure biochar was added to 10mL of lead-containing aqueous solutions with concentrations of 5, 10, 20, 30, 50, 100, 200, 300, and 500mg / L, and the pH value of the solution was adjusted to 5 with 1M HCl and NaOH solutions. . Shake at a constant temperature of 25°C and 180rpm for 24h (5min or more than 4min is acceptable, as long as the adsorption equilibrium is reached). The treated solution is separated from solid and liquid under the action of an external magnetic field, and the supernatant is filtered through a filter with a pore size of 0.48 μm to obtain a filtrate. The untreated lead in the filtrate was measured with a flame ato...

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Abstract

The invention discloses a method for removing lead in a water body by using magnetic pig manure biochar. The method comprises the steps as follows: magnetic pig manure biochar is added to the lead-containing water body, the pH value of the water body is controlled between 2 and 7, and constant-temperature vibrating treatment is performed to adsorb lead in the water body. The magnetic pig manure biochar is prepared in the following steps: (1) pretreated pig manure is subjected to high-temperature pyrolysis in nitrogen and pig manure biochar is obtained; (2) a pig manure biochar dispersion liquid is prepared, a ferric iron salt solution and a ferrous iron salt solution are mixed and stirred, and an iron salt mixed solution is prepared; (3) the pig manure biochar dispersion liquid and the iron salt mixed solution are mixed and stirred, the pH value is adjusted, boiling, filtration, washing and drying are performed, and the magnetic pig manure biochar is obtained. The method has the advantages of being simple to operate, low in cost, capable of quickly and efficiently adsorbing lead, easy in separation and recovery, reusable, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for removing lead in water, in particular to a method for removing lead in water by using magnetic pig manure biochar prepared from pig manure as a raw material. Background technique [0002] Lead is a very toxic heavy metal. Due to the lead-containing wastewater, waste gas and waste residue discharged from industrial production processes such as mining, smelting, petroleum refining, storage batteries, glass, paint, paint, medicine, and ships, the pollution of lead and its compounds to the environment is becoming more and more serious. It can affect various organs such as nerves, hematopoiesis, digestion, urology, reproduction and development, cardiovascular, endocrine, immunity, bones, etc. The main target organs are the nervous system and hematopoietic system. What is more serious is that it affects the growth and intellectual development of infants and young ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34C02F1/28C02F101/20
CPCB01J20/20B01J20/28009B01J20/3475B01J2220/4887C02F1/281C02F2101/20
Inventor 王荣忠黄丹莲张辰刘云国赖萃曾光明薛文静龚小敏万佳张青罗浩
Owner HUNAN UNIV
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