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Synergistic removal of sulfate and cd(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 strong reducibility. , good removal performance, 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

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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 cd(ii) wastewater by sponge iron and microorganisms

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for removing sulfate and Cd(II) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0041] (1) Preparation of sponge iron

[0042] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:2, reaction temperature 1200°C, and reaction time 25 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 0.6 g / L, which is designated as reaction solution A.

[0043] (2) Preparation of sulfate reducing bacteria SRB

[0044] A kind of sulfate-reducing bacterium—Desulfovibrio (Desulfovibrio; Desulfovibrio desulfurization subspecies) purchased from China General Microorganism Culture Collection Management Center (Chaoyang District, Beijing, China, zip code 100101, number 1.3469) was selected for 2 rings, and the It was transferred to 40ml of Desulfovibrio...

Embodiment 2

[0056] A method for removing sulfate and Cd(II) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0057] (1) Preparation of sponge iron

[0058] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:2, reaction temperature 1200°C, and reaction time 25 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.

[0059] (2) Preparation of sulfate reducing bacteria SRB

[0060] A kind of sulfate-reducing bacterium---Desulfovibrio (Desulfovibrio) purchased from China Common Microorganism Culture Collection Management Center (Chaoyang District, Beijing, China, Zip Code 100101, No. 1.3469) picks 2 rings, transfers it in 40ml nutrient solution, Cultivate in the dark at 35°C for 5 days, use the proliferation medi...

Embodiment 3

[0072] A method for removing sulfate and Cd(II) wastewater in cooperation with sponge iron and microorganisms, comprising the following steps:

[0073] (1) Preparation of sponge iron

[0074] Under the conditions of carbon content (mass ratio of simple carbon powder to iron slime) 1:2, reaction temperature 1200°C, and reaction time 25 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.

[0075] (2) Preparation of sulfate reducing bacteria SRB

[0076] A sulfate-reducing bacterium—Desulfovibrio bacilli purchased from the China General Microorganism Culture Collection Management Center (Chaoyang District, Beijing, China, Zip Code 100101, No. 1.3469) was selected for 2 rings, transferred to 30ml of nutrient solution, and incubated at 35°C Cultivate in the dark for 3 days, use prolif...

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Abstract

The invention discloses a method for removing sulfate and Cd (II) wastewater through sponge iron and microorganism synergism. The method comprises: under the anaerobic condition, a sponge iron solution A, a bacterium suspension B of sulfate reducing bacteria, and a bacterium suspension C of iron reducing comamonas are mixed in a volume ratio of 1:1:1-1:3:4 and aged for 40-60 min, deoxidized and deionized water is used for repeated washing after a reaction is completed, and a sterilized saline solution is used for soaking; a mixture of sponge iron and sulfate reducing bacteria / iron reducing bacteria is obtained; the obtained mixture of sponge iron and sulfate reducing bacteria / iron reducing bacteria is mixed with sulfate and Cd(II) wastewater, the reaction lasts for more than 20 hours under the normal temperature, and wastewater sulfate and Cd(II) are purified at the same time. According to the method, the removal rate of Cd (II) metal is above 85%, required equipment is simple and convenient to operate, reactions are completed under normal temperature and normal pressure, products are the solid phase, a reaction system is a liquid phase, products can be separated easily, 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 Cd (II) whose concentration exceeds the standard. Background technique [0002] Cadmium-containing wastewater is recognized as one of the most serious environmental hazards today. Cadmium pollution in water mainly comes from surface runoff and industrial wastewater. The wastewater discharged from pyrite ore to produce sulfuric acid and phosphate rock to produce phosphate fertilizer contains high cadmium, which can reach tens to hundreds of micrograms per liter of wastewater. Cadmium particles formed by combustion and incineration of plastic products may enter the water; cadmium discharged from catalysts, pigments, plastic stabilizers, synthetic rubber vulcanizing agents, and fungicides that use pots as raw materials will also pollute water bodies. Among them, the cadmium content in drinking ...

Claims

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Application Information

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