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Method for converting toxic hexavalent chromium into trivalent chromium by organic matter

A technology of organic matter and trivalent chromium, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution and low removal rate of sludge or sediment, and improve flocculation Effect, avoid secondary pollution, effect with obvious effect

Inactive Publication Date: 2018-05-11
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing method for removing toxic hexavalent chromium in waste water, sludge or soil has a low removal rate and produces a large amount of sludge or sediment to cause secondary pollution, a method for removing toxic hexavalent chromium by using organic matter is proposed. Method for converting chromium to trivalent chromium

Method used

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specific Embodiment approach 1

[0027] Specific implementation mode one: the present embodiment adopts the method that poisonous hexavalent chromium is converted into trivalent chromium by organic matter and is carried out according to the following steps:

[0028] To contain Cr 6+ Add organic matter to the waste water, control pH = 4-8, react for 30-60 minutes, and then complete;

[0029] The organic matter is a mixture of one or more of glucose, white granulated sugar, sucrose or ethanol in any proportion.

[0030] This embodiment has the following beneficial effects:

[0031] 1. In this embodiment, the toxic Cr 6+ rapid conversion to Cr 3+ , Cr 6+ The transformation process is safe and environmentally friendly, with obvious effects, and quickly realizes the transformation of the valence state of heavy metal chromium, which is suitable for the treatment of heavy metal Cr in wastewater, reducing Cr 6+ Harm to the environment, and the treatment process does not produce additional sludge or sediment, avo...

specific Embodiment approach 2

[0034]Specific embodiment two: the difference between this embodiment and specific embodiment one is that: the 6+ Organic matter is added to the waste water, the pH is controlled to be 6, and the reaction is completed in 45 minutes; the organic matter is glucose. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: Cr in the waste water 6+ The ratio of the concentration of BOD to the concentration of BOD provided by organic matter in wastewater is 1: (2-6). Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for converting toxic hexavalent chromium into trivalent chromium by organic matter, relates to a method for converting toxic hexavalent chromium into trivalent chromium, and aims to solve the problems of low removal rate of existing methods for removing toxic hexavalent chromium from wastewater, sludge or soil and secondary pollution caused by a large amount of sludge or sediment. The method comprises the following steps: adding the organic matter to the wastewater containing Cr<6+>, and controlling pH to be 4-8 for reaction for 30 -60 minutes; or, mixing the organic matter with soil containing Cr<6+> or sludge containing Cr<6+>, then adding domestic sludge, and controlling pH to be 4-8 for reaction for 60-120 minutes. Toxic Cr<6+> is rapidly converted intoCr<3+> with a biological inhibition method, the conversion process of Cr<6+> is safe and environmentally friendly, the effect is remarkable, conversion of valence states of heavy metal chromium is rapidly realized, secondary pollution is avoided, and the cost is low. The method is suitable for conversion of toxic hexavalent chromium into trivalent chromium.

Description

technical field [0001] The invention relates to a method for converting toxic hexavalent chromium into trivalent chromium. Background technique [0002] Heavy metals are widely used in different application fields and play an important role. Adding metal ions will greatly improve the performance of materials. For example, aircraft materials contain a certain amount of chromium to improve their strength, and the metal surface is chrome-plated to increase corrosion resistance. In the context of rapid industrial development, more and more heavy metal-rich wastewater is directly or indirectly discharged into the environment, and more and more pollutants are discharged into the environment. Human activities are the main cause of heavy metal pollution in water, and the substandard discharge and arbitrary discharge of industrial heavy metal wastewater are the most important reasons, among which heavy metal ion wastewater produced by mining, mineral processing, metallurgy, electropl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/22
CPCC02F1/70C02F2101/22
Inventor 魏利赵云发张玉华陈光浩
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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