Method for preparing nano zero-valent iron from water purification plant iron-containing sludge and application

A nano-zero-valent iron and water purification plant technology, applied in water/sludge/sewage treatment, water pollutants, nanotechnology, etc., can solve the problems of unfavorable large-scale industrial application, complicated preparation process, and high cost of raw materials. Achieve the effect of convenient recycling modification, simple preparation method and easy recycling

Inactive Publication Date: 2019-04-12
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current preparation process of zero-valent iron is complicated, the energy consumption is large, and the cost of raw materials is high, which is not conducive to large-scale industrial application. The problem is to provide a method and application for preparing nano-zero-valent iron from iron-containing sludge in a water purification plant. The prepared nano-zero-valent iron has high-efficiency catalytic performance and good magnetic properties, and can be used to activate persulfate catalytic oxidation Advanced Oxidation Process for Degrading Organic Pollutants in Water

Method used

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  • Method for preparing nano zero-valent iron from water purification plant iron-containing sludge and application
  • Method for preparing nano zero-valent iron from water purification plant iron-containing sludge and application
  • Method for preparing nano zero-valent iron from water purification plant iron-containing sludge and application

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specific Embodiment approach 1

[0025] Specific embodiment one: what this embodiment records is a kind of method that utilizes the iron-containing sludge of water purification plant to prepare nanometer zero-valent iron, and the specific steps of described method are as follows:

[0026] Step 1: Pretreatment of iron-containing sludge: first, air-dry the iron-containing sludge naturally to a moisture content of 5% to 10%, then pulverize it, and then put the pulverized sludge into a blast drying box. Dry at 105°C for 24 hours, then further grind and sieve through 200 mesh to obtain a dry sludge sample; the source of the iron-containing sludge is: the coagulation / flocculation treatment unit of the water purification plant uses iron salt ( Contains ferric chloride, ferric sulfate, polyferric chloride, polyferric aluminum chloride and other iron-containing reagents) as a flocculant, after coagulation-sedimentation treatment to obtain high-concentration muddy water, then add polyacrylamide, stir and centrifuge and ...

specific Embodiment approach 2

[0028] Embodiment 2: In Embodiment 1, a method for preparing nanometer zero-valent iron using iron-containing sludge from a water purification plant, in step 2, the inert gas is argon.

specific Embodiment approach 3

[0029] Specific embodiment three: a method for preparing nano-zero-valent iron from the iron-containing sludge of a water purification plant described in specific embodiment one or two, in step two, the flow rate of the inert gas or nitrogen is 160 mL / min ; During the calcination process, the flow rate of inert gas or nitrogen was 100 mL / min.

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Abstract

The invention provides a method for preparing nano zero-valent iron from water purification plant iron-containing sludge. After the sludge taken from a water purification plant settling pond is subjected to filter-press dewatering, air-drying and smashing, the sludge is subjected to high-temperature drying pretreatment, dry iron sludge particles are obtained, the dry iron sludge particles are ground and screened, and an iron sludge sample is obtained; and under inert gas shielding, high-temperature calcination and pyrolysis are carried out, and the magnetic nano zero-valent iron material is obtained. The invention relates to application of the nano zero-valent iron catalyst prepared with the method in activating persulfate to oxidatively degrade organic pollutants in water. The method is based on resource recovery of the sludge produced through a water purification plant, the prepared catalyst has an efficient catalytic degradation effect, the catalyst is easily separated, recovered and reused from a water phase under an external magnetic field, the raw materials are environmentally friendly and easy to obtain, the preparation method is simple and economical, waste is turned into wealth, the effect of treating waste water with waste is achieved, and broad practical application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and water treatment, and in particular relates to a method and application of preparing nanometer zero-valent iron from iron-containing sludge of a water purification plant. Background technique [0002] Nano zero-valent iron has a large specific surface area, good adsorption, and strong reducibility, so it has efficient catalytic properties for certain peroxides (such as: persulfate, etc.); at the same time, zero-valent iron With good magnetic characteristics, it can be separated from water by an external magnetic field and reused. It can be used for catalytic degradation to remove organic pollutants in water environment. It is regarded as a catalytic material with broad application prospects and has received extensive attention in recent years. The currently reported preparation methods of nano-zero-valent iron mainly include chemical methods and physical methods. The method re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B01J23/745B01J35/08C02F1/72B82Y40/00C02F101/30
CPCB01J23/745B01J35/0033B01J35/08B22F9/20B82Y40/00C02F1/725C02F2101/30
Inventor 朱世俊徐勇鹏王威
Owner HARBIN INST OF TECH
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