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Method for cooperatively removing and selectively recovering heavy metal cations and non-metal anions from wastewater

A technology of heavy metals and cations, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve problems such as poor treatment effect, heavy secondary pollution, and poor load-bearing capacity, and achieve operational Simple, low cost, anti-leaching effect

Inactive Publication Date: 2016-04-20
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the defects of poor load tolerance, poor treatment effect, and heavy secondary pollution in the wastewater containing heavy metal cations and non-metallic toxic anion composite pollutants in the prior art, the present invention provides a collaborative removal method using chitosan-based composite adsorbents. and methods for selective recovery of heavy metal cations and nonmetal toxic anions

Method used

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  • Method for cooperatively removing and selectively recovering heavy metal cations and non-metal anions from wastewater

Examples

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Effect test

Embodiment 1

[0032] A method for synergistically removing and selectively recovering heavy metal cations and non-metal poisonous anions by using a chitosan-based composite adsorbent, the steps of which are:

[0033] (1) Synergistic adsorption: put 10mL of adsorbent into a jacketed glass adsorption column (Φ20×300mm), keep the column temperature at 25°C, and mix nickel ion and phosphate (initial concentration of nickel ion is 1mmol / L , the initial concentration of phosphate ions is 1mmol / L), adjust the pH to 5, pass through the adsorption column filled with adsorbent at a flow rate of 5BV / h, and the processing capacity is 50BV / batch. The average concentration of nickel ions in the adsorbed water is 0.721mmol / L, and the concentration of phosphate ions is 0.324mmol / L.

[0034] (2) Nickel ion recovery: raise column temperature to 30 ℃, use 20BV dilute hydrochloric acid solution (molar concentration is 0.001mmol / L, the concentration of hydrochloric acid and sodium hydroxide in the following exa...

Embodiment 2

[0041] With embodiment 1, difference is: the initial concentration of nickel ion is 1mmol / L in the step (1), and the initial concentration of phosphate ion is 2mmol / L, under the same adsorption and regeneration condition, remaining nickel ion after adsorption The concentration is 0.759mmol / L, and the phosphate ion concentration is 0.658mmol / L. The desorption rate of nickel ions in the first stage of regeneration reached 94%, and no phosphate was detected; the desorption rate of phosphate in the second stage of regeneration reached 97%.

Embodiment 3

[0043] Same as Example 1, the difference is that the column temperature in the adsorption stage in step (1) is changed to 40°C, the flow rate of the mixed solution is 30BV / h, the average concentration of nickel ions in the adsorbed water is 0.712mmol / L, and the concentration of phosphate ions is 0.303 mmol / L. The desorption effect is close to Example 1.

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Abstract

The invention discloses a method for cooperatively removing and selectively recovering heavy metal cations and non-metal anions from wastewater and belongs to the field of sewage purification. The method comprises steps as follows: 1) cooperative adsorption: the pH value of wastewater is adjusted to range from 3-10, and then the wastewater is pumped into an adsorbent bed filled with a chitosan-based composite adsorbent; 2) recovery of heavy metal cations: first-stage generation is performed on the adsorbent in Step 1) with a dilute acid solution; 3) recovery of non-metal anions: second-stage regeneration is performed on the generated adsorbent in Step 2) with a dilute alkali solution, and the completely regenerated adsorbent is cleaned with clear water to be neutral and can be reused. The method can cooperatively remove and selectively recover high-purity heavy metal cations and poisonous non-metal anions, has dual benefit of pollution reduction and resource recovery, is applicable to wastewater in heavy industries, is also applicable to comprehensive wastewater and biochemical tail water in industrial parks as well as polluted surface water, underground water and the like, and has the wide application range.

Description

technical field [0001] The invention belongs to the field of sewage purification, and more specifically relates to a method for synergistically removing and selectively recovering heavy metal cations and non-metal anions in waste water. Background technique [0002] With the acceleration of industrialization, surface water and groundwater are generally polluted by a variety of toxic and harmful substances, including heavy metal cations and non-metal poisonous anions. Heavy metal cations mainly include Cu, Zn, Cd, Ni, Hg, etc., which are not biodegradable and metabolizable, and have "three-induced" effects, while non-metallic toxic anions mainly include NO 3- 、PO 4 3- ,P 2 o 7 4- Relevant water environment quality standards at home and abroad have put forward strict limits for the above pollutants. Compound pollution is common in water bodies in my country, and the coexistence of multiple pollutants greatly increases the difficulty of treatment. At present, the convent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28B01J20/26B01J20/30B01J20/28
CPCB01J20/06C02F1/286C02F1/288C02F9/00B01J20/24B01J20/261B01J20/28021C02F1/66C02F2301/08C02F2101/163C02F2101/105C02F2101/20B01J2220/4825B01J2220/4806B01J2220/46B01J2220/4812
Inventor 刘福强张艳红朱长青朱增银韦蒙蒙陈达罗堃张小朋李爱民
Owner NANJING UNIV
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