Macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof

A composite adsorption and high molecular polymer technology, which is applied in the direction of adsorption of water/sewage treatment, water pollutants, and other chemical processes, can solve the problems of nitrogen content, improve tolerance, facilitate recycling, and reduce costs Effect

Active Publication Date: 2017-10-20
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-cost, small-occupied, reusable, and effective method for removing pollutants in wastewater for the existing mixed wastewater containing pollutants such as nitrogen, phosphorus, and heavy metals

Method used

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  • Macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof
  • Macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof
  • Macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof

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preparation example Construction

[0030] 1) The preparation of polymer biochar balls is to use one or more of agricultural and forestry wastes such as chaff, sawdust, straw, water hyacinth, and fruit shells as raw materials, first crushed, dried, and then cracked by microwave (power 1100 -1500W) to prepare biochar powder. The obtained biochar powder was dried in an oven at 105°C for 24 hours; β-cyclodextrin, sodium borohydride and water were added to a short-necked flat-bottomed flask, wherein the mass ratio of β-cyclodextrin to water was 1:1, The mass ratio of β-cyclodextrin to sodium borohydride ranges from 860:1 to 430:1, and stir until the cyclodextrin becomes a slurry. Weigh a certain amount of epichlorohydrin (the mass ratio of β-cyclodextrin to epichlorohydrin ranges from 1:1 to 1:1.5), and slowly drop it into the stirring liquid. After all the epichlorohydrin is dropped in, continue to stir for 15-25 minutes, and then slowly drop NaOH with a concentration of 40wt% (the mass ratio of β-cyclodextrin to ...

Embodiment 1

[0048] (1) Grind and grind the dried water hyacinth stems and leaves, and then crack them with 1300W microwave for 180s. The obtained biochar powder is mixed with β-cyclodextrin, sodium borohydride, water, epichlorohydrin, and NaOH with a concentration of 40wt%. After mixing with paraffin and going through a series of treatments such as mechanical stirring, the excess paraffin is filtered off, the polymer biochar spheres are washed with water or ethanol, and dried in an oven at 65°C to obtain the required polymer biochar spheres for use.

[0049] (2) Chlorella is selected as the algae species Chlorella vugaris , culture light intensity is 120 µmol photons / m 2 / s, the temperature is 26±2°C, the pH is 7, and the biomass concentration in the stock solution measured after 6 days of cultivation is 0.8g / L

[0050] (3) Put 2g of polymer biochar spheres into 50ml of algae liquid and let it stand for 5 hours to prepare the composite adsorbent for immobilizing microalgae with polymer ...

Embodiment 2

[0057] (1) Grind and grind the dried water hyacinth stems and leaves, and then crack them with 1300W microwave for 200s. After mixing with paraffin and going through a series of treatments such as mechanical stirring, the excess paraffin is filtered off, the polymer biochar spheres are washed with water or ethanol, and dried in an oven at 65°C to obtain the required polymer biochar spheres for use.

[0058] (2) Chlorella is selected as the algae species Chlorella vugaris , culture light intensity is 120 µmol photons / m 2 / s, the temperature is 26±2°C, the pH is 7, and the biomass concentration in the stock solution measured after 8 days of cultivation is 0.9g / L

[0059] (3) Put 2g of polymer biochar spheres into 50ml of algae liquid and let it stand for 5 hours to prepare the composite adsorbent for immobilizing microalgae with polymer biochar spheres. Another 2g of polymer biochar spheres was weighed for separate adsorption.

[0060] (4) The composite adsorbent and 2g of po...

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Abstract

The invention relates to a macromolecular biochar sphere-immobilized microalgal composite adsorbent and preparation and application thereof; the macromolecular biochar spheres are a spherical support formed under specific conditions by adding a macromolecular polymer to biochar that serves as a main material; microalgae and biochar spheres are mixed in a certain ratio, microalga-secreted extracellular polymer is used as a binder under the cooperation of lighting, nutrition and the other conditions, the binder reacts with developed pores in the surfaces of the biochar spheres to adsorb micrometer-level microalgal cells, and accordingly, the advantage of the biochar spheres to quickly adsorb heavy metals in wastewater is made full use, it is possible to further enrich the heavy metals in mixed wastewater via growth and metabolism of algal cells so as to consume nitrogen, phosphorus and other eutrophic nutrients in the wastewater. The method allows the nitrogen and phosphorus in wastewater to be effectively removed and heavy metals to be also removed, and has the advantages of zero secondary pollution, good production process simplicity, good availability and the like.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a composite adsorbent for microalgae immobilized by polymer biochar spheres and its preparation and application. Background technique [0002] With the continuous increase of population and the rapid development of social economy, fresh water resources are constantly being destroyed and polluted. Therefore, one of the current research hotspots is to find renewable, low-consumption and high-efficiency sewage biological treatment technologies. Among them, with the continuous development of industry, agriculture, fertilizer and other industries, the pollutants in the discharged wastewater are also increasing to form mixed wastewater. The pollution in the mixed wastewater mainly includes heavy metal elements such as Cd, Cu, Cr, Pb, Zn and Nutrients such as nitrogen and phosphorus. Mixed wastewater containing heavy metals is difficult to degrade and will be enriched along the food cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/24B01J20/30C02F1/28C02F101/10C02F101/16C02F101/20
CPCB01J20/20B01J20/24C02F1/288C02F2101/105C02F2101/16C02F2101/20
Inventor 沈英俞涛朱雯喆谢友坪陈剑锋
Owner FUZHOU UNIV
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