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Method for improving bio-availability of sulfur by means of converting sulfur into polysulfide

A technology of sulfide and polysulfide, applied in the field of wastewater treatment, can solve the problems of low water solubility and low bioavailability of elemental sulfur

Inactive Publication Date: 2016-09-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both are not only ring structures, but also have extremely low water solubility (19±6nmolL -1 ), so theoretically the bioavailability of elemental sulfur is not high

Method used

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  • Method for improving bio-availability of sulfur by means of converting sulfur into polysulfide
  • Method for improving bio-availability of sulfur by means of converting sulfur into polysulfide
  • Method for improving bio-availability of sulfur by means of converting sulfur into polysulfide

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The synthesis of embodiment 1 soluble zerovalent sulfur

[0040] In this example, by setting six 200ml Erlenmeyer flasks with pH in the range of 6-8.5, the reaction equilibrium time and the equilibrium concentration of soluble zerovalent sulfur were explored. The synthesis of soluble zerovalent sulfur does not depend on the presence of microorganisms, that is, as long as there is S 0 and HS - , PS can be formed at a suitable pH.

[0041] refer to figure 1 , PS concentration was positively correlated with sulfide concentration and pH. When the pH is 8.5, it takes 2.5h to react to reach equilibrium, and the equilibrium concentration of soluble zerovalent sulfur is 135.00mg / L. However, when the pH drops to 6, the reaction equilibrium time is extremely short, and the soluble zerovalent sulfur is only 0.38 mg / L, making it almost impossible to synthesize. The relationship between the equilibrium concentration of dissolved zerovalent sulfur and pH in the figure is consist...

Embodiment 2

[0042] Example 2 Effect of soluble zerovalent sulfur on sulfur reduction

[0043] In this example, by setting 6 Erlenmeyer flasks (2.4L), the initial sulfide concentration is 0-200mg / L, glucose is used as the carbon source, the sludge concentration is 0.68gVSS / L, and the dosage of elemental sulfur is 5g / L. L, the initial pH is adjusted to the optimum range of 7.5 with HCL or NaOH.

[0044] figure 2 and image 3 In , it reflects the effect of dissolved zerovalent sulfur on the sulfur reduction rate and the concentration change of dissolved zerovalent sulfur.

[0045] 1). The initial sulfide concentration increased from 0mg / L to 200mg / L, and the initial dissolved zerovalent sulfur concentration rose from a very low value to 206.34mg / L, which increased the driving force of the sulfur reduction process. In the first 3 hours, the average rate of sulfur reduction under different initial sulfide concentrations showed a nearly linear increase, and the bioreduction rate of elementa...

Embodiment 3

[0048] The control of embodiment 3 soluble zerovalent sulfur

[0049] refer to Figure 4 , in the present embodiment, by setting 3 Erlenmeyer flasks (2.4L), the initial sulfide concentration is 0mg / L. With glucose as carbon source (TOC=40mg / L), the sludge concentration is 0.66gVSS / L, S 0 The dosage is 5g / L. The initial pH of the first Erlenmeyer flask was adjusted to 7.5 (NC) with HCL or NaOH, and 12.48mMFe was added to the second 2+ (C1), the third Erlenmeyer flask was adjusted to pH 6 with HCL, and its pH was kept constant throughout the experiment (C2).

[0050] After precipitating PS and sulfide, microorganisms will interact with S 0 direct contact. S at 9h 0 The reduction rate, C1 is only 2.5% of NC, while C2 has no obvious sulfide accumulation. After the experiment, the TOC of C1 and C2 did not change significantly, and the soluble zerovalent sulfur of the two during the reaction was also not detected. While under non-control conditions, the removal rate of TOC w...

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Abstract

The invention belongs to the field of wastewater treatment, and provides a method for improving bio-availability of sulfur by means of converting the sulfur into polysulfide. The method is characterized in that solid elemental sulfur in an aqueous solution is quickly dissolved and is converted into the polysulfide under normal temperature and normal pressure by means of controlling a pH value and an initial HS<-> concentration, so that the bio-availability of the sulfur is improved. The method disclosed by the invention has the advantages that a synthesis process of dissolved zero-valent sulfur is explained, the biological reduction rate of the elemental sulfur is improved by the dissolved zero-valent sulfur, meanwhile the sulfide production rate is also accelerated, and the synthesis rate of the dissolved zero-valent sulfur is increased with the increasing of the biological reduction rate of the elemental sulfur, therefore a positive feedback reaction among the biological reduction rate of the elemental sulfur, the sulfide production rate and the dissolved zero-valent sulfur is formed under the conditions limited by the method.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a method for sulfonating sulfur into polysulfide to improve its bioavailability. Background technique [0002] Elemental sulfur is a substance that exists widely in nature. It has both oxidizing and reducing properties, so it can be used as a reducing agent or oxidizing agent in the sewage treatment process, such as autotrophic denitrification of nutrient-poor sewage, heavy metal-containing wastewater Biological treatment, denitrification of drinking water and groundwater, and even urban sewage treatment with low sludge production rate. [0003] Under anaerobic conditions, microorganisms can use organic matter or H 2 As an electron donor, the dissimilatory reduction of elemental sulfur into sulfides (sulfides have S in the water phase 2- 、HS - and H 2 S three forms). Elemental sulfur in the natural state exists in the form of chains and rings, and the most st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/20
CPCC01B17/20
Inventor 江峰张泽锋梁爽张怡萍郭家华丘艳莹何嘉豪陈梦丽
Owner SOUTH CHINA NORMAL UNIVERSITY
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