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Process for repairing chromium-polluted underground water by adopting micro-nano composite particles

A composite particle, micro-nano technology, applied in the direction of contaminated groundwater/leachate treatment, water pollutants, adsorbed water/sewage treatment, etc., can solve the problems of narrow pH range, unstable products, etc., and achieve the improvement of adsorption effect , multiple adsorption sites, good adsorption performance

Pending Publication Date: 2022-04-01
SUZHOU ZHONGSHENG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cellulose still has some disadvantages in application, such as the applicable pH range is narrow; it is degradable under acid and alkaline conditions, and the product is unstable

Method used

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  • Process for repairing chromium-polluted underground water by adopting micro-nano composite particles
  • Process for repairing chromium-polluted underground water by adopting micro-nano composite particles
  • Process for repairing chromium-polluted underground water by adopting micro-nano composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A process for repairing chromium-contaminated groundwater by using micro-nano composite particles, comprising the following steps:

[0029] S1. The ZrOCl2 solution with a concentration of 0.1mol / L is configured, wood powder with a diameter of 100um is added, stirred and impregnated, then ammonia water is added, and reacted in an autoclave. The temperature in the autoclave is 120°C, and the reaction time is 40h. After the reaction is completed, put it into the muffle furnace and burn it at a high temperature. The burning temperature is 780°C to obtain porous ZrO 2 Material;

[0030] S2. The porous ZrO prepared in step S1 2 The material was dissolved in an aqueous NMMO solvent with a concentration of 92 wt% to obtain ZrO with a concentration of 5 wt% 2 / NMMO mixture;

[0031] S3. With ZrO 2 / NMMO mixed solution is used as solvent, bamboo pulp cellulose is used as cellulose precursor, and bamboo pulp cellulose is dissolved in ZrO 2 / NMMO mixed solution, heated and vac...

Embodiment 2

[0036] A process for repairing chromium-contaminated groundwater by using micro-nano composite particles, comprising the following steps:

[0037] S1. The ZrOCl2 solution with a concentration of 0.2mol / L is configured, and resin particles with a diameter of 2mm are added, stirred and impregnated, then ammonia water is added, and reacted in an autoclave. The temperature in the autoclave is 140°C, and the reaction time is 20h. After the reaction is completed, put it into the muffle furnace for high-temperature burning, and the burning temperature is 850°C to obtain porous ZrO 2 Material;

[0038] S2. The porous ZrO prepared in step S1 2The material was dissolved in an aqueous NMMO solvent with a concentration of 90wt% to obtain ZrO with a concentration of 2wt% 2 / NMMO mixture;

[0039] S3. With ZrO 2 / NMMO mixed solution is used as solvent, bamboo pulp cellulose is used as cellulose precursor, and bamboo pulp cellulose is dissolved in ZrO 2 / NMMO mixed solution, heated and ...

Embodiment 3

[0044] A process for repairing chromium-contaminated groundwater by using micro-nano composite particles, comprising the following steps:

[0045] S1. The configuration concentration is 0.15mol / L ZrOCl2 solution, adding polylactic acid particles with a diameter of 1mm, stirring and impregnating, then adding ammonia water, reacting in the autoclave, the temperature in the autoclave is 125 ° C, and the reaction time is 30h. After the reaction is completed, put it into a muffle furnace and burn it at a high temperature at 800°C to obtain porous ZrO 2 Material;

[0046] S2. The porous ZrO prepared in step S1 2 The material was dissolved in an aqueous NMMO solvent with a concentration of 90 wt% to obtain a concentration of 3.6 wt% ZrO 2 / NMMO mixture;

[0047] S3. With ZrO 2 / NMMO mixed solution is used as solvent, bamboo pulp cellulose is used as cellulose precursor, and bamboo pulp cellulose is dissolved in ZrO 2 / NMMO mixed solution, heated and vacuumized at 110°C for 7h to...

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Abstract

The process for repairing the chromium-polluted underground water comprises the following steps: S1, preparing a porous ZrO2 material; s2, the porous ZrO2 material prepared in the step S1 is dissolved in an NMMO water solvent, and a ZrO2 / NMMO mixed solution is obtained; s3, preparing cellulose-ZrO2 composite aerogel by taking the ZrO2 / NMMO mixed solution as a solvent and bamboo pulp cellulose as a cellulose precursor; s4, grafting carbonyl groups or phenolic hydroxyl groups on the surface of the cellulose-ZrO2 composite aerogel prepared in the step S3, so as to obtain surface modified cellulose-ZrO2 composite aerogel; s5, loading nano-iron on the outer side of the modified cellulose-ZrO2 composite aerogel prepared in the step S4 to obtain micro-nano composite particles; and S6, repairing underground water by adopting the micro-nano composite particles. According to the invention, the micro-nano composite particles are combined with an ex-situ remediation technology, so that the pollution of heavy metal chromium in underground water can be greatly reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a process for repairing chromium-contaminated groundwater by using micro-nano composite particles. Background technique [0002] Groundwater is an essential natural resource for human survival. Compared with surface water, it has the advantages of wide distribution, stable water quality parameters, and less pollution, and is an excellent water supply source. The total amount of water resources in my country is large, but the per capita water resources are very scarce, only 1 / 4 of the world average level. [0003] my country's groundwater resources are "more in the south and less in the north", accounting for 1 / 3 of the country's total water resources. In recent years, my country's population growth and rapid economic development have led to an increasingly severe supply and demand situation for groundwater resources. With the increasing amount of groundwater mining in our countr...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F103/06
Inventor 张宗文王兵程文博
Owner SUZHOU ZHONGSHENG ENVIRONMENTAL REMEDIATION CO LTD