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Reductive iron-sulfur mixed colloid as well as preparation method and application thereof

A colloidal, iron-sulfur technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problem of reducing the reactivity and migration ability of ferrous sulfide particles, and the stabilization effect is not very ideal, Solve the problems of low passivation efficiency of heavy metals, achieve the effect of good sludge passivation of heavy metals, good practical application potential, and high economic utilization

Inactive Publication Date: 2020-09-04
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferrous sulfide minerals have a large particle size and low passivation efficiency for heavy metals; and nano-ferrous sulfide, due to the van der Waals force between nanoparticles, the particles are easy to agglomerate to form large particle agglomerates, making the surface reaction site Points are reduced, which significantly reduces the reactivity and migration ability of ferrous sulfide particles, and will lose reactivity in a short time, which significantly limits its industrial application
The existing iron-based colloids are easy to oxidize, easy to agglomerate and have short reaction time, and the passivation effect is not good, which is the main problem of using iron-based colloids to treat sludge containing heavy metals
Therefore, the stabilization effect of iron-based colloids for treating heavy metals in sludge is not very ideal

Method used

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  • Reductive iron-sulfur mixed colloid as well as preparation method and application thereof
  • Reductive iron-sulfur mixed colloid as well as preparation method and application thereof
  • Reductive iron-sulfur mixed colloid as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Preparation and application of a reducing iron-sulfur mixed colloid for the stabilization and restoration of heavy metals in sludge

[0023] In this example, the water-soluble organic polymer compound is sodium polyacrylate (PAAS). Under the condition of a water bath at a temperature of 80°C, it is mechanically stirred at 400r / min for 1h, dissolved in water, and 0.1% by mass of polyacrylate is prepared. Sodium acrylate solution; ferrous sulfate (FeSO 4 ) solution concentration is 0.25mol / L; sodium sulfide (Na 2 S) The solution concentration is 0.5mol / L.

[0024] After the prepared water-soluble organic polymer solution was exposed to nitrogen for 0.5h, under normal temperature and anaerobic conditions, mechanically stirred at 400r / min, and FeSO was slowly added to the solution at a rate of less than 5mL / min. 4 Solution, obtain water-soluble organic polymer ferrous mixed colloid, wherein FeSO 4 The mass ratio to PAAS is 10:1. After the dropwise addition wa...

Embodiment 2

[0028] Example 2: Preparation and application of a reducing iron-sulfur mixed colloid for the stabilization and repair of heavy metals in sludge

[0029] In this example, the water-soluble organic polymer compound is polysodium methacrylate (SPMAA). Under the condition of a water bath at a temperature of 70°C, it is mechanically stirred at 350r / min for 1 hour, dissolved in water, and the mass percentage of the configuration is 0.15%. Sodium polymethacrylate solution; ferrous sulfate (FeSO 4 ) solution concentration is 0.5mol / L; sodium sulfide (Na 2 S) The solution concentration is 1.0mol / L.

[0030] After the prepared water-soluble organic polymer solution was exposed to nitrogen for 0.5h, under normal temperature and anaerobic conditions, mechanically stirred at 400r / min, and FeSO was added to the solution at a rate of 50 drops / min. 4 Solution, obtain water-soluble organic polymer ferrous mixed colloid, wherein FeSO 4 The mass ratio to SPMAA is 20:1. After the dropwise addit...

Embodiment 3

[0034] Example 3: Preparation and application of an original iron-sulfur mixed colloid for the stabilization and restoration of heavy metals in sludge

[0035] In this example, the water-soluble organic polymer compound is sodium polyacrylate (PAAS). Under the condition of a water bath at a temperature of 75° C., it is mechanically stirred at 400 r / min for 1 hour, dissolved in water, and 0.15% by mass of polyacrylate is prepared. Sodium acrylate solution; ferrous sulfate (FeSO 4 ) solution concentration is 0.5mol / L; sodium sulfide (Na 2 S) The solution concentration is 1.0mol / L.

[0036] After the prepared water-soluble organic polymer solution was exposed to nitrogen for 0.5h, under normal temperature and anaerobic conditions, mechanically stirred at 400r / min, and FeSO was slowly added to the solution at a rate of less than 5mL / min. 4 Solution, obtain water-soluble organic polymer ferrous mixed colloid, wherein FeSO 4 The mass ratio to PAAS is 12:1. After the dropwise add...

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Abstract

The invention discloses a reductive iron-sulfur mixed colloid as well as a preparation method and application thereof. The colloid comprises a water-soluble organic polymer compound and a ferrous sulfide compound; the water-soluble organic polymer compound is one or two of polyacrylate and polymethacrylate. The reductive iron-sulfur mixed colloid provided by the invention has high passivation rateon heavy metals in sludge under different pH and organic matter conditions, and the passivation effect is remarkable and long-lasting. The preparation method disclosed by the invention is simple, practical, convenient and easy to implement, simple in process equipment requirement, green in process flow, free of secondary pollution, wide in raw material cost source and low in price, can be used for efficiently passivating polluted heavy metal sludge, and has good market application potential.

Description

technical field [0001] The invention relates to a restoration agent for sludge, in particular to a reducing iron-sulfur mixed colloid, a preparation method and an application thereof. Background technique [0002] Sludge is a solid, semi-solid or liquid residue produced in the sewage treatment process. It is an extremely complex heterogeneous body composed of bacterial cells, organic debris and inorganic particles. With the improvement of economic development and urbanization level, the world produces about 45 million tons of sludge annually. Due to the rapid doubling of sludge production and its complex composition, the effective treatment and disposal of sludge has become one of the current hot spots. Sludge treatment is an important link in the sewage treatment process. Due to the special methods currently required to treat sludge, the cost of sludge treatment accounts for more than 50% of the operating cost of sewage treatment, because municipal sludge has a strong met...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/00C02F2101/20
Inventor 李时银姚有如阴俐米纳李晶何欢杨绍贵宋海欧
Owner NANJING NORMAL UNIVERSITY
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