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Method for treating hexavalent chromium wastewater based on pyrrhotite biochar loaded acidophilic bacteria biological membrane

A technology of pyrrhotite and acidophilic bacteria, which is applied in the field of pollutant biological treatment, can solve the problems of high cost of reducing agent, reducing the utilization rate of reducing agent, and low treatment efficiency, so as to avoid secondary pollution and increase the reduction rate , filter thoroughly effect

Pending Publication Date: 2021-04-09
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

The above-mentioned treatment method of chromium-containing wastewater has the following defects: ① the cost of reducing agent is high, and it may cause secondary pollution if it is not properly treated; , reducing the utilization rate of the reducing agent, resulting in low processing efficiency
Using FeSO 4 Modification, preparation of loaded pyrrhotite (Fe 1-x The biochar of S) removes hexavalent chromium in wastewater by adsorption and reduction, and acidophilic bacteria can adsorb on the surface of pyrrhotite to form a biofilm, inhibit the passivation layer produced during the reduction of hexavalent chromium, and acidophilus Bacterial extracellular polymers have adsorption to heavy metals such as trivalent chromium, so the method proposed by the present invention is a method with low cost, high efficiency, and easy promotion, and no relevant reports have been seen at present

Method used

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  • Method for treating hexavalent chromium wastewater based on pyrrhotite biochar loaded acidophilic bacteria biological membrane
  • Method for treating hexavalent chromium wastewater based on pyrrhotite biochar loaded acidophilic bacteria biological membrane
  • Method for treating hexavalent chromium wastewater based on pyrrhotite biochar loaded acidophilic bacteria biological membrane

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example 1

[0022] The simulated wastewater with a concentration of 300mg / L was treated at a temperature of 25°C and a pH of 5.5. The waste sawdust from a furniture factory was crushed and passed through a 20-mesh sieve to obtain sawdust powder; after mixing ferrous sulfate and sawdust powder according to the ratio of 0.8:1 in mass ratio, they were made into a 15% (w / v) suspension, fully After stirring, dry at 105°C, place in a tube furnace, and pyrolyze at 600°C for 1 hour under nitrogen atmosphere to obtain pyrrhotite-loaded biochar; inoculate ferrous sulfur oxide into 9K medium Bacillus, cultivated to the logarithmic phase at 28°C; add the loaded orpiment iron biochar into the medium at a ratio of 10% (w / v), shake it at 120 rpm for 0.5h, and filter to obtain the loaded Biochar of acid bacteria: Add the biochar loaded with acidophilic bacteria into the hexavalent chromium wastewater at a ratio of 100g / L, and simultaneously use an aeration device for air aeration to control the dissolved...

example 2

[0024] The electroplating wastewater containing hexavalent chromium in an electroplating factory was treated. The concentration of hexavalent chromium in the wastewater at room temperature was 189.7mg / L, and the pH was 2.5. The straw is pulverized and passed through a 20-mesh sieve to obtain the straw powder; after mixing the ferrous sulfate and the straw powder according to the ratio of 1:1 by mass, they are made into a 30% (w / v) suspension, and after fully stirring, the Dry at ℃, place in a tube furnace, and pyrolyze at 550℃ for 2 hours under nitrogen atmosphere to obtain pyrrhotite-loaded biochar; Cultivate to the logarithmic phase under conditions; add orpiment iron-loaded biochar into the medium at a ratio of 10% (w / v), shake at 180 rpm for 0.5h, and filter to obtain biochar loaded with acidophilus bacteria ; The biochar loaded with acidophilus is added to the hexavalent chromium wastewater in a ratio of 50g / L, and an aeration device is used for air aeration at the same t...

example 3

[0026] The electroplating wastewater containing hexavalent chromium from a chromium salt factory was treated. The concentration of hexavalent chromium in the wastewater at room temperature was 156.8 mg / L, and the pH was 3. Pulverize the rice husk and pass through a 40-mesh sieve to obtain rice husk powder; mix ferrous sulfate and rice husk powder according to the ratio of 0.8:1 by mass, make a 20% (w / v) suspension, and stir thoroughly , dried at 65°C, placed in a tube furnace, and pyrolyzed at 650°C for 3 hours in a nitrogen atmosphere to obtain pyrrhotite-loaded biochar; inoculate Thiobacillus ferrooxidans and Sulfobacillus, cultivated at 35°C for 24h to the logarithmic phase; add orpiment iron-loaded biochar into the medium at a ratio of 10% (w / v), shake at 120 rpm for 1h, and obtain the loaded Biochar of acidophilus: add the biochar loaded with acidophilus into the hexavalent chromium wastewater at a ratio of 45g / L, and use an aeration device to aerate with oxygen to contro...

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Abstract

The invention discloses a method for treating hexavalent chromium wastewater based on a pyrrhotite biochar-loaded acidophilic bacteria biological membrane, which comprises the following steps: (1) preparing pyrrhotite-loaded biochar: crushing biomass, soaking the crushed biomass in FeSO4, and pyrolyzing in a tubular furnace; (2) culturing acidophilic bacteria and preparing a biological membrane: adding the pyrrhotite-loaded biochar into an acidophilic bacteria culture medium, and adsorbing the acidophilic bacteria on the surface of pyrrhotite after oscillation to form the biological membrane; and (3) wastewater treatment: adding the pyrrhotite biochar loaded with the acidophilic bacteria biofilm into the wastewater containing hexavalent chromium, controlling the temperature to be 20-60 DEG C, carrying out air or oxygen aeration by using an aeration device, and filtering the solution when the wastewater does not contain hexavalent chromium. The method has the advantages of low cost, mild reaction, simple process and high chromium removal rate, and can be applied to treatment of hexavalent chromium-containing wastewater in electroplating plants, smelting plants, electronic plants and the like.

Description

technical field [0001] The invention belongs to the field of biological treatment of pollutants, and mainly relates to a method for treating hexavalent chromium wastewater based on pyrrhotite biochar loaded with acidophilic bacteria biofilm. Background technique [0002] Chromium and its compounds are important industrial raw materials, widely used in electroplating, smelting, electronic processing, leather processing, and pigment printing and dyeing industries. However, with the development of industry, a large amount of hexavalent chromium wastewater has caused serious environmental pollution. Chromium in wastewater is mainly hexavalent chromium and trivalent chromium, of which trivalent chromium can form precipitates and has low toxicity, while hexavalent chromium is an important pollutant because of its high solubility in water and strong biological toxicity. [0003] At present, the treatment methods of wastewater containing hexavalent chromium mainly include chemical ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/70C02F101/22
CPCC02F9/00C02F3/106C02F3/107C02F1/283C02F1/28C02F1/70C02F2101/22
Inventor 张盼月叶俊沛李青青杨佩徽
Owner BEIJING FORESTRY UNIVERSITY
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