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Method for synthesizing polymeric ferric sulfate by microbial catalysis

A technology of polymerizing ferric sulfate and microorganisms, which is applied in the field of environmental engineering, can solve the problems of high equipment and production conditions, large acid input, etc., and achieve the effect of increasing the basicity, reducing the amount of addition, and improving the flocculation effect

Inactive Publication Date: 2009-08-12
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a new method for the synthesis of polyferric sulfate by microbial catalysis, which overcomes the defects that have been brought by chemical synthesis in the past, such as the need to strengthen operations such as oxidant, high temperature, and high pressure for chemical synthesis, and the amount of acid input Large, high requirements on equipment and production conditions, etc.

Method used

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  • Method for synthesizing polymeric ferric sulfate by microbial catalysis
  • Method for synthesizing polymeric ferric sulfate by microbial catalysis
  • Method for synthesizing polymeric ferric sulfate by microbial catalysis

Examples

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Embodiment 1

[0035] Example 1 Catalytic synthesis of polyferric sulfate by microbial method

[0036] Weigh analytically pure FeSO 4· 7H 2 O300g is placed in a 500mL conical flask, add 200mL of deionized water, measure 100mL of Thiobacillus ferrooxidans inoculum with a graduated cylinder and put it in the conical flask, and adjust the pH of the system to 1.4 with sulfuric acid, seal the bottle mouth with gauze, and place at 28°C Constant temperature shaking incubator at 180r.min -1 Shake culture under the conditions for 60 hours, take it out, put it in a cool and dry place and let it stand for 3 weeks, then filter to remove the insoluble matter, and measure the indicators of the product. After analysis, the basicity is 14.5%, and the property parameters of this product are as follows:

[0037] project standard value Measured value of this product Density, g / cm 3 (20°C) — 1.285 pH (1% aqueous solution) 2.0—3.0 2.2 Total iron content, %≥ 11.0 11.27 R...

Embodiment 2

[0039] Example 2 Catalytic synthesis of polyferric sulfate by microbial method

[0040] Weigh analytically pure FeSO 4· 7H 2 O 35kg is placed in the reactor (full-automatic microbial fermentation tank) that has added 20L deionized water, add Thiobacillus ferrooxidans inoculum 15L, and after adjusting system pH=1.4 with sulfuric acid, open the reactor, the temperature is set to 28 ℃ , and ventilation and stirring at the same time, the reaction 60h. After taking it out, put it in a cool and dry place to stand and mature for 4 weeks, then filter to remove the insoluble matter. The properties and parameters of the product are as follows.

[0041] project standard value Measured value of this product Density, g / cm 3 (20°C) — 1.281 pH (1% aqueous solution) 2.0—3.0 2.15 Total iron content, %≥ 11.0 11.25 Reduced iron content, %≤ 0.1 — Basicity, %≥ 9.0 14.3

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Abstract

The invention provides a method for synthesizing polymeric ferric sulfate through microbial catalysis. The method comprises the steps of taking ferrous sulphate and water as main raw materials, performing aerobic culture on the raw materials for 2 to 4 days at normal temperature and normal pressure through the catalysis of Thiobacillus ferrooxidans, preparing a polymeric ferric sulfate solution through oxidation, hydrolysis, polymerization and other processes, keeping the solution stand to cure the solution for 3 to 4 weeks, filtering the cured solution and obtaining a product. The product is a homogeneous red brown polymeric ferric sulfate solution, of which the base saturation degree can reach 14.0 percent, and cannot deteriorate after long-term storage. The method for preparing polymeric ferric sulfate has the advantages of convenient operation, economic viability, safety, reliability, energy conservation and environmental protection, and is a novel method for preparing polymeric ferric sulfate with high efficiency and convenience.

Description

1. Technical field [0001] The invention relates to a microbial catalytic synthesis method of polyferric sulfate, a high molecular inorganic flocculant used in water treatment such as water supply and drainage, and belongs to the technical field of environmental engineering. 2. Background technology [0002] Polymerized ferric sulfate is an inorganic polymer flocculant developed in recent years. It introduces hydroxyl groups into the network structure of iron molecular clusters. - Bridging to form multi-nuclear complex ions. Compared with traditional flocculants such as ferric chloride, aluminum sulfate, and ferric sulfate chloride, polymerized ferric sulfate has the advantages of less dosage in the purification process, wide pH range, and high removal rate of impurities (SS, COD, turbidity, etc.) , low residue concentration, large alum flowers and fast sedimentation, good decolorization effect, non-toxic and other advantages. The production methods of polyferric sulfate ar...

Claims

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Application Information

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IPC IPC(8): C12P3/00C12R1/01
Inventor 周立祥宋兴伟
Owner NANJING AGRICULTURAL UNIVERSITY
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