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Synergistic removal of sulfate and zn(ii) wastewater by sponge iron and microorganisms

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

Active Publication Date: 2019-04-09
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 sulfate and zn(ii) wastewater by sponge iron and microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for the collaborative removal of sulfate and Zn(II) wastewater by sponge iron and microorganisms comprises 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) 2:3, reaction temperature 1200°C, and reaction time 30 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 0.3 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 subsp. Transfer to 40ml Desulfovibrio nutrient medium, culture in the dark at 35°C for 5 days, use Desulfovibrio proliferation medium with 5% inoculum to carry out expanded culture for 2 days, and centrifuge at 3000r / min for 20min to obtain...

Embodiment 2

[0054] A method for the collaborative removal of sulfate and Zn(II) wastewater by sponge iron and microorganisms comprises 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) 2:3, reaction temperature 1200°C, and reaction time 30 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 0.5 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 4d, and then 5% of the inoculum was expanded with proliferation medium for 3 day...

Embodiment 3

[0070] A method for the collaborative removal of sulfate and Zn(II) wastewater by sponge iron and microorganisms comprises 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) 2:3, reaction temperature 1200°C, and reaction time 30 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 0.1 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 5d, 5% of the inoculum was expanded with proliferation medium for 2 days, and ce...

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Abstract

The invention relates to a method for removing sulfate and Zn(II) wastewater by virtue of synergism of spongy iron and microorganisms. The method comprises the following steps of: mixing a spongy iron solution A, a bacterial suspension B of sulphate reducing bacteria and a bacterial suspension C of ferric reducing comamonas at a volume ratio of (1:1:1) to (1:3:4), aging the mixture for 40-60 minutes, repeatedly washing with deoxidization deionized water after reaction is finished, and soaking a product in a stroke-physiological saline solution, thereby obtaining a mixture of spongy iron and sulphate reducing bacteria / iron-reducing bacteria; mixing the mixture of spongy iron and sulphate reducing bacteria / iron-reducing bacteria with the sulfate and the Zn(II) wastewater, performing reaction at a room temperature for 20 hours or more, and purifying the wastewater sulfate and the Zn(II) at the same time. The method is capable of achieving the Zn(II) removal rate not less than 91%, required equipment is simple, the operation is convenient, reaction is finished at the normal temperature and a normal pressure, products are in a solid phase, the reaction system is in a liquid phase, the products are easy to separate, and 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 Zn (II) whose concentration exceeds the standard. Background technique [0002] Due to rapid economic development and accelerated urbanization, the world currently imports about 3.93 million tons of zinc into the ocean through rivers every year. Industrial wastewater discharged from mining sites, mineral processing plants, alloy plants, metallurgical complexes, machine manufacturing plants, galvanizing plants, instrumentation plants, organic synthesis plants, and paper mills contains a large amount of zinc compounds. The discharge of these zinc-containing wastewater , causing serious environmental pollution and waste of resources. Moreover, once zinc-containing wastewater enters the environment, it cannot be biodegraded, and most of it participates in the food chain cycle and eventually accum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/28
CPCC02F3/28C02F3/34
Inventor 陈元彩牛珠玉张振
Owner SOUTH CHINA UNIV OF TECH
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