Synergistic Removal of Sulphate and Cr(ⅵ) Wastewater by Sponge Iron and Microorganisms

A technology of sponge iron and sulfate, applied in chemical instruments and methods, biological water/sewage treatment, water pollutants, etc., can solve problems such as loose structure, low activity, and low unit microbial content, and achieve enhanced reduction process, The effect of maintaining the reducing activity

Active Publication Date: 2019-06-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the floc structure of ordinary anaerobic sludge is loose, the sedimentation performance is poor, the unit microbial content is small, the activity is not high, and there is also the problem of bacterial loss.

Method used

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  • Synergistic Removal of Sulphate and Cr(ⅵ) Wastewater by Sponge Iron and Microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for removing sulfate and Cr(Ⅵ) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0039] (1) Preparation of sponge iron

[0040] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:1, reaction temperature 1160°C, and reaction time 20 min, iron slime was used as raw material to calcinate to prepare conventional sponge iron solid. Activate with dilute hydrochloric acid to prepare a sponge iron solution with a concentration of 0.2 g / L, which is designated as reaction solution A.

[0041] (2) Preparation of sulfate reducing bacteria SRB

[0042] Select 2 rings from a sulfate-reducing bacterium—Desulfovibrio (Desulfovibrio; Desulfovibrio desulfurization subspecies) purchased from China General Microorganism Culture Collection Management Center (Chaoyang District, Beijing, China, Zip Code 100101, No. 1.3469), Transfer it to 30ml of Desulfovibrio nutrient medium, culture at 35°C in...

Embodiment 2

[0054] A method for removing sulfate and Cr(Ⅵ) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0055] (1) Preparation of sponge iron

[0056]Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:1, reaction temperature 1160°C, and reaction time 20 min, iron slime was used as raw material to calcinate to prepare conventional sponge iron solid. Activate with dilute hydrochloric acid to prepare a sponge iron solution with a concentration of 0.1 g / L, which is designated as reaction solution A.

[0057] (2) Preparation of sulfate reducing bacteria SRB

[0058] Select 2 rings from a kind of sulfate-reducing bacterium—Desulfovibrio (same as Example 1) purchased by China Common Microorganism Culture Collection and Management Center, transfer it to 30ml nutrient solution, and cultivate it in the dark at 35°C for 3d, to 5% of the inoculum was expanded with the proliferation medium for 2 days, centri...

Embodiment 3

[0070] A method for removing sulfate and Cr(Ⅵ) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0071] (1) Preparation of sponge iron

[0072] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:1, reaction temperature 1160°C, and reaction time 20 min, iron slime was used as raw material to calcinate to prepare conventional sponge iron solid. Activate with dilute hydrochloric acid to prepare a sponge iron solution with a concentration of 0.5 g / L, which is designated as reaction solution A.

[0073] (2) Preparation of sulfate reducing bacteria SRB

[0074] Select 2 rings from a kind of sulfate-reducing bacterium—Desulfovibrio (same as Example 1) purchased by China Common Microorganism Culture Collection and Management Center, transfer it to 30ml nutrient solution, and cultivate it in the dark at 35°C for 3d, to 5% of the inoculum was expanded with proliferation medium for 2 days, and centr...

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Abstract

The invention discloses a method for synergically removing sulfate and Cr (VI) in wastewater through sponge iron and microorganisms. The method comprises the steps that under anaerobic conditions, a sponge iron solution A, a bacterial suspension B of sulfate reducing bacteria and a bacterial suspension C of sulfate reducing bacteria are mixed according to the volume ratio of 1 to 3 to 4, aging is performed for 30-60 minutes, sponge iron / microbial microspheres are repeatedly washed with deoxidized deionized water after the reaction finished and are soaked in a sterile saline solution to obtain a mixture of sponge iron and sulfate reducing bacteria / iron reducing bacteria; the mixture of sponge iron and sulfate reducing bacteria / iron reducing bacteria is mixed with sulfate and Cr (VI) in the wastewater, reaction is performed at room temperature for more than 24 hours, and meanwhile the sulphate and Cr (VI) in the wastewater are purified. The Cr (VI) metal removal rate of the method is above 89%, the required equipment is simple, reaction is completed at normal temperature and pressure, a product is a solid phase, a reaction system is a liquid phase, the product is easy to separate, and the method is used for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for advanced treatment of sewage, in particular to a method for advanced treatment of sewage containing sulfate and heavy metal Cr(VI) whose concentration exceeds the standard. Background technique [0002] Chromium-containing wastewater is recognized as one of the most serious environmental hazards today. Chromium pollution in water mainly comes from wastewater discharged from tanning, electroplating, and chromium salt production. Chromium mainly exists in the form of trivalent [Cr(Ⅲ)] and hexavalent [Cr(Ⅵ)] in water, of which Cr(Ⅵ) The toxicity is very high, about 100 times that of Cr(Ⅲ), if the content of Cr(Ⅵ) in water is greater than 0.1mg·L -1 , will have a toxic effect on the human body. Chromium-containing waste water with excessive content is mixed into agricultural irrigation or aquaculture, and if ingested into the human body through food, it will cause cancer. Moreover, it is irritating to human skin and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/10C02F101/22
CPCC02F3/34C02F3/345C02F3/346C02F2101/101C02F2101/22
Inventor 陈元彩张振
Owner SOUTH CHINA UNIV OF TECH
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