Treatment and reutilization method of organic and inorganic compound polluted loess leaching liquid

An inorganic composite and eluent technology, which is applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, inorganic chemistry, etc. Pollution and other problems, to achieve excellent removal effect, fast coagulation and hardening, convenient extraction and easy operation.

Active Publication Date: 2017-09-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the pollutants may migrate from the loess and the processing time is longer
[0004] The leaching technology of polluted loess is a new method of repairing polluted loess, and it is a supplement to the bioremediation of polluted loess. The leaching method mainly uses a leaching agent to clean the loess, so that the pollutants in the loess flow out with the leaching agent, and then The subsequent treatment of the eluent and loess can achieve the purpose of repairing the polluted loess, and it is necessary to re-treat the eluent to avoid secondary pollution. At present, most of the eluent treatment is a single treatment of heavy metal pollution or Organic pollution, and heavy metal and organic pesticide pollution cannot be dealt with at the same time

Method used

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  • Treatment and reutilization method of organic and inorganic compound polluted loess leaching liquid
  • Treatment and reutilization method of organic and inorganic compound polluted loess leaching liquid
  • Treatment and reutilization method of organic and inorganic compound polluted loess leaching liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] see figure 1 , at a temperature of 25°C, the concentration ratio of the three pollutants Pb / Cd / pyridion in the eluent is 5 / 5 / 10mL / g, and the eluate and the prepared adsorbent are separated into liquid-solid The ratio is 25 and placed in four 500ml beakers respectively, the pHs are 5, 6, 7, and 8 respectively, and stirring is carried out at a speed of 20-80 rpm to make the adsorbent fully contact with the solution. After it reacted for 4 hours, measure the amount of three kinds of pollutants in four beakers and obtain the removal rate, the obtained data are as follows: figure 1 The removal rates of Pb and Cd showed an upward trend with the increase of pH. When pH=8, the removal rate of Pb was 84.43%, and the removal rate of Cd was 75.59%. The formula fluctuation reaches the maximum at pH=6, which is 30.64, and the adsorption effect is the best when the removal rate is the maximum.

Embodiment 2

[0055] see figure 2 , the concentration ratio of the three kinds of pollutants Pb / Cd / pyridion in the eluate is 5 / 5 / 10mL / g at pH=7, the concentration ratio of the eluate and the adsorbent made in the liquid-solid ratio Place 25 in four 500ml beakers respectively, heat the four beakers in a water bath at 5°C, 15°C, 25°C, and 35°C, and stir at a rate of 20-80rpm to make the adsorbent fully contact with the solution. After it reacted for 4 hours, measure the amount of three kinds of pollutants in four beakers and obtain the removal rate, the obtained data are as follows: figure 2 As the temperature rises, the removal rate of Pb increases but the trend tends to be flat. When the temperature is 35°C, the removal rate of Pb reaches a maximum of 83.59%. The removal rate of Cd decreases slightly with the increase of temperature and reaches 15°C The maximum is 71.25%. The removal rate of pyrithione increases slowly with the increase of temperature. The maximum removal rate is 30.01% ...

Embodiment 3

[0057] see image 3 , at a temperature of 25°C, pH=7, and the concentration ratio of the three pollutants Pb / Cd / pyridion in the eluate being 5 / 5 / 10mL / g, the eluent and the prepared adsorption The agent was placed in four 500ml beakers with a liquid-solid ratio of 25, and stirred at a speed of 20-80rpm so that the adsorbent fully contacted with the solution. After 1h, 2h, 4h, and 8h, respectively, measure the amount of pollutants in the eluent after adsorption and obtain the removal rate, such as image 3 It is shown that with the increase of time, the Pb removal rate increases greatly between 1h and 2h, the upward trend of the curve between 2h and 4h is slightly slow, and the trend between 4h and 8h is flat and basically unchanged. The removal rate reached a maximum of 82.68% at 8h; the Cd removal rate increased with the increase of time, and the Cd removal rate increased greatly between 1h and 2h, and the upward trend of the curve between 2h and 8h was slightly slow, reachin...

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Abstract

The invention discloses a treatment and reutilization method of organic and inorganic compound polluted loess leaching liquid. The treatment and reutilization method comprises the following steps: putting an organic and inorganic compound body, a loess ferromanganese nodule and losses clay mineral into a granulating machine according to the mass ratio of (10 percent to 40 percent) to (10 percent to 40 percent) to (10 percent to 40 percent) and granulating; in a granulating process, adding a gypsum solution to prepare an adsorbent for carrying out adsorption treatment on the organic and inorganic polluted loess leaching liquid containing organic chlorpyrifos pesticide and inorganic heavy metal Pd / Cd. According to the treatment and reutilization method disclosed by the invention, the concentration of Pb and Cd in an adsorbed solution is detected; after the concentration reaches the standard, the solution can be directly reused for agricultural irrigation and drop irrigation and the aim of recycling and reutilizing the chlorpyrifos pesticide and other nutrients in the solution is realized. The adsorbent obtained by precipitation and centrifugal separation is safely backfilled or used in other ways, such as a road construction axillary material and a building axillary material.

Description

technical field [0001] The invention belongs to the technical field of organic and inorganic pollution treatment of loess, and in particular relates to a method for purifying and treating leaching wastewater of heavy metal polluted loess, and a method for treating and reusing organic pesticide pollution. Background technique [0002] Current status of loess pollution in my country Loess pollution can be roughly divided into heavy metal pollution, pesticide and organic pollution, radioactive pollution, pathogenic bacteria pollution and other types. Heavy metals are a major group of inorganic pollutants and pollute large areas of land due to their presence in sludge, fertilizers, pesticides, municipal waste, mine residues, and smelting industries. Most heavy metals are known carcinogens and can pose serious threats to living populations due to their non-degradable, persistent and cumulative nature. Chlorpyrifos is a broad-spectrum insecticide developed by Dow Chemical Company...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30C02F101/34C02F101/36C02F101/38
Inventor 范春辉赖苗
Owner SHAANXI UNIV OF SCI & TECH
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