Method for preparing modified biochar with aquatic plant waste and hematite

Modified biochar is prepared from aquatic plant waste and hematite, and uses ultrasonic and high-temperature pyrolysis technology to solve the problem of biochar's insufficient adsorption capacity for nitrate and phosphate, and achieve efficient and low-cost eutrophication of water bodies. Wastewater treatment.

CN105771898AInactive Publication Date: 2016-07-20LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
Filing Date
2016-04-28
Publication Date
2016-07-20
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing biochar has insufficient adsorption capacity for nitrate and phosphate in water, and the preparation method of existing iron-loaded biochar composite materials is complex and expensive, making it difficult to effectively deal with the problem of eutrophication in water.

Method used

Modified biochar is prepared from aquatic plant waste and hematite. Through ultrasonic treatment and high-temperature pyrolysis technology, combined with nitrogen protection, the adsorption performance of the biochar is improved, and the neutrality is maintained by flushing with deionized water.

Benefits of technology

The prepared modified biochar has high adsorption capacity for nitrate and phosphate, is low in cost, has high stability, is reusable, is suitable for industrial production, and significantly improves the treatment effect of eutrophic wastewater.

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Abstract

The invention belongs to the field of biochar adsorbing materials, and relates to a method for preparing modified biochar with aquatic plant waste and hematite. The method includes the following steps: (1) naturally drying aquatic plants prior to crushing to obtain aquatic plant powder; (2) crushing the hematite to obtain hematite powder; (3) weighing the hematite powder prior to putting the hematite powder into deionized water, and performing ultrasonic treatment to obtain suspension; (4) weighing the aquatic plant powder, soaking the aquatic plant powder in the suspension, and stirring and drying to obtain fully mixed aquatic plant and hematite mixture; (5) weighing the fully mixed aquatic plant and hematite mixture, putting the mixture in a batch-type atmosphere furnace, and feeding nitrogen into the furnace; performing temperature programming to the target temperature, and maintaining final-temperature pyrolysis; after the pyrolysis process is finished, obtaining the target product, namely the modified biochar. The modified biochar has strong adsorbability in nitrate and phosphate, high in stability and reusable.
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