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A method for the synergistic removal of sulfate and cu(II) wastewater by sponge iron and microorganisms

A sponge iron and sulfate technology, applied in chemical instruments and methods, biological water/sewage treatment, water pollutants, etc., can solve the problems of low unit microbial content, poor sedimentation performance, loss of bacteria, etc., and achieve simple equipment, Convenient operation and strong electrochemical enrichment effect

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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  • A method for the synergistic removal of sulfate and cu(II) wastewater by sponge iron and microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of method that sponge iron and microorganism synergistically remove sulfate and Cu (II) waste water comprises the following steps:

[0040] (1) Preparation of sponge iron

[0041] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:3, reaction temperature 1100°C, and reaction time 20 minutes, 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 0.4 g / L, which is designated as reaction solution A.

[0042] (2) Extraction of sulfate-reducing bacteria SRB

[0043] Select 2 rings from a sulfate-reducing bacterium—Desulfovibrio (Desulfovibrio; Desulfovibrio subsp. Transfer to 30ml Desulfovibrio nutrient medium and culture in the dark at 35°C for 3 days, use Desulfovibrio proliferation medium with 5wt% inoculum to expand culture for 2 days, and centrifuge at 3000r / min for 10min to obtain the lo...

Embodiment 2

[0055] A kind of method that sponge iron and microorganism synergistically remove sulfate and Cu (II) waste water comprises the following steps:

[0056] (1) Preparation of sponge iron

[0057] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:3, reaction temperature 1100°C, and reaction time 20 minutes, 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 0.8 g / L, which is designated as reaction solution A.

[0058] (2) Preparation of sulfate-reducing bacteria SRB

[0059] 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 40ml of nutrient solution, and cultivate it in the dark at 35°C for 3d, with 5% of the inoculum was expanded with proliferation medium for 3 day...

Embodiment 3

[0071] A kind of method that sponge iron and microorganism synergistically remove sulfate and Cu (II) waste water comprises the following steps:

[0072] (1) Preparation of sponge iron

[0073] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:3, reaction temperature 1100°C, and reaction time 20 minutes, 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.

[0074] (2) Preparation of sulfate-reducing bacteria SRB

[0075] 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 40ml of nutrient solution, and cultivate it in the dark at 35°C for 3d, with 5% of the inoculum was expanded with proliferation medium for 3 day...

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Abstract

A method of removing sulfates and Cu (II) in waste water through combining sponge iron and microbes is disclosed. The method includes mixing a sponge iron solution A, a sulfate reducing bacterium suspension B and an iron-reducing comamonas bacterium suspension C in a volume ration of 1:1:1-1:3:4 under anaerobic conditions, ageing for 40-70 min, repeatedly washing with deoxygenated deionized water after the reaction is finished, and soaking in sterile physiological saline to obtain a mixture of the sponge iron and the sulfate reducing bacteria / iron-reducing bacteria. The mixture is mixed with the waste water containing the sulfates and the Cu (II), and reacted at room temperature for 20 h or more to simultaneously purify the sulfates and Cu (II) in the waste water. The removing rate of the Cu (II) by the method is 87% or above. The method is simple in required device and convenient to operate. Reactions are finished at room temperature under atmospheric pressure. A product is a solid phase, and a reaction system is a liquid phase so that the product is easy to separate. The method is suitable 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 Cu(II) whose concentration exceeds the standard. Background technique [0002] With the development of the metallurgical industry and the electronic industry, a large amount of copper powder washing wastewater, electroplating wastewater and alkaline ammonia etching waste liquid in the production process of printed circuit boards have been produced. These copper-containing wastewater have high economic value, but are harmful to people and the environment. There is danger. Relevant studies have shown that, as a beneficial element necessary for life, copper itself is less toxic, but after the human body inhales excessive copper, it will stimulate the digestive system, cause abdominal pain and vomiting, and long-term excess can cause liver cirrhosis. Copper is also highly toxic to lower organisms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/10C02F101/20C21B13/00
CPCC02F3/345C02F3/346C02F2101/101C02F2101/20C21B13/00
Inventor 陈元彩黄壮鹏黎良浩
Owner SOUTH CHINA UNIV OF TECH
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