Composite type magnetic microalgae biological adsorbent and method thereof for adsorbing cadmium in wastewater

A microalgae biological and adsorbent technology, applied in biological water/sewage treatment, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of difficult separation of microalgae and wastewater, low activity of microalgae, loss of microalgae, etc. , to achieve the effect of effective recycling, reducing difficulty and preventing loss

Inactive Publication Date: 2019-01-18
ZHEJIANG OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at overcoming the problem that microalgae are easily lost from the reactor in the treatment of microalgae adsorbing pollutants in waste water in the prior art, and the separation of microalgae and waste water is difficult after the treatment is completed, the cost is high, and the activity of microalgae is low. The problem is to provide a composite magnetic microalgae biosorbent that can effectively fix the microalgae, prevent the loss of the microalgae from the reactor, facilitate the separation of the microalgae and the wastewater after the treatment, and have high microalgae activity. Method for Adsorbing Cadmium in Wastewater

Method used

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  • Composite type magnetic microalgae biological adsorbent and method thereof for adsorbing cadmium in wastewater

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Effect test

Embodiment 1

[0033] A composite magnetic microalgae biosorbent, the preparation method of the composite magnetic microalgae biosorbent is as follows:

[0034] (S.1) Microalgae culture: inoculate microalgae with Chlorella in BG11 medium for shaking culture, culture temperature is 20°C, shaking frequency is 100rpm, light condition is 50μmol m -2 the s -1 , to obtain a microalgae bioconcentration of 5×10 7 Individual / mL microalgae culture solution;

[0035] (S.2) Magnetic Fe 3 o 4 Preparation of nanoparticles: Ferric salt, ferrous salt and hydrochloric acid were formulated into Fe 3+ , Fe 2+ An acidic iron salt solution with a molar ratio of 2.0:1:1 to HCl, the ferric salt is ferric sulfate, and the ferrous salt is ferrous sulfate, and then added dropwise into ammonia water with a mass fraction of 20% , the volume ratio of iron salt solution and ammonia water is 1:4. After precipitation and separation, add distilled water to wash 3 times, and vacuum freeze-dry for 36 hours to obtain mag...

Embodiment 2

[0038] A composite magnetic microalgae biosorbent, the preparation method of the composite magnetic microalgae biosorbent is as follows:

[0039] (S.1) Microalgae culture: Scenedesmus was inoculated with microalgae in BG11 medium for shaking culture, the culture temperature was 30°C, the shaking frequency was 220 rpm, and the light condition was 150 μmol m -2 the s -1 , the microalgae bioconcentration was 8×10 7 Individual / mL microalgae culture solution; (S.2) Magnetic Fe 3 o 4 Preparation of nanoparticles: Ferric salt, ferrous salt and hydrochloric acid were formulated into Fe 3+ , Fe 2+An acidic iron salt solution with a molar ratio of 3.0:1:1 to HCl, the ferric salt is ferric chloride, and the ferrous salt is ferrous sulfate, and then added dropwise into ammonia water with a mass fraction of 30% In this method, the volume ratio of iron salt solution and ammonia water is 1:6. After precipitation and separation, add distilled water to wash 4 times, and vacuum freeze-dry ...

Embodiment 3

[0042] A composite magnetic microalgae biosorbent, the preparation method of the composite magnetic microalgae biosorbent is as follows:

[0043] (S.1) Microalgae culture: Inoculate Botrytis algae with microalgae in BG11 medium for shaking culture. The culture temperature is 25°C, the shaking frequency is 150rpm, and the light condition is 100μmol m -2 the s -1 , the microalgae bioconcentration was 6×10 7 Individual / mL microalgae culture solution;

[0044] (S.2) Magnetic Fe 3 o 4 Preparation of nanoparticles: Ferric salt, ferrous salt and hydrochloric acid were formulated into Fe 3+ , Fe 2+ An acidic iron salt solution with a molar ratio of 2.5:1:1 to HCl, the ferric salt is ferric carbonate, and the ferrous salt is ferrous chloride, and then added dropwise into ammonia water with a mass fraction of 25% In this method, the volume ratio of iron salt solution and ammonia water is 1:5. After precipitation and separation, add distilled water to wash 4 times, and vacuum freez...

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Abstract

The invention relates to the field of sewage treatment, and particularly relates to a composite type magnetic microalgae biological adsorbent and a method thereof for adsorbing cadmium in wastewater.A preparation method of the composite type magnetic microalgae biological adsorbent comprises the following steps: (S.1) microalgae culture: culturing microalgae in a culture medium to obtain microalgae culture liquid; (S.2) preparation of magnetic Fe3O4 nano particles: preparing an acid iron salt solution from trivalent iron salt, bivalent iron salt and hydrochloric acid, and performing precipitation separation and cleaning to obtain magnetic Fe3O4 nano particles; (S.3) compounding: adding the magnetic Fe3O4 nano particles into the microalgae culture liquid, and performing shake culture to obtain magnetic microalgae. The invention overcomes the problems of the prior art that the microalgae is easily lost from a reactor, the difficulty in separating microalgae and wastewater is great, thecost is high and the microalgae activity is low, and has the following advantages: (1) the composite type microalgae biological adsorbent can be effectively recycled to prevent loss; (2) the separation is convenient while the separation cost is low; (3) the activity and the overall treatment efficiency are high.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a composite magnetic microalgae biosorbent and a method for adsorbing cadmium in waste water. Background technique [0002] As a metal, cadmium (Cd) is widely used in electroplating industry, chemical industry, electronics industry, nuclear industry and other fields. A considerable amount of cadmium (Cd) is discharged into the environment through waste gas, waste water and waste residue every year, causing pollution. Compared with other metals, cadmium is more easily absorbed by crops, thus posing a huge threat to human health. [0003] Common cadmium (Cd) treatment methods include chemical precipitation, ion exchange, adsorption and other methods. The adsorption method for the removal of heavy metal pollutants in wastewater has the advantages of flexible and convenient operation process, advanced treatment, and recovery of heavy metal ions in wastewater through desorption, and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F3/32C02F101/20
CPCB01J20/06B01J20/24B01J20/28009B01J2220/46B01J2220/4825C02F3/322C02F2101/20
Inventor 李晨高锋杨红丽彭苑媛
Owner ZHEJIANG OCEAN UNIV
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