A kind of preparation method of strong carbon secreting type modified biochar

A biochar, modified technology, applied in sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc. The effect of sufficient raw materials and reduced production costs

Active Publication Date: 2021-04-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent document CN 104761057A discloses a biochar modular composite vertical flow constructed wetland system, the concept of adding biochar to the vertical flow constructed wetland, most of the currently used biochar is prepared at high temperature, and most of the organic matter is gasified, providing The capacity of the carbon source is extremely limited, and after a period of use, the processing capacity will decrease. Therefore, it is of great significance to develop a new type of high carbon-absorbing wetland substrate to promote the denitrification and denitrification effect of the wetland and realize the efficient utilization of wetland plant resources.

Method used

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  • A kind of preparation method of strong carbon secreting type modified biochar
  • A kind of preparation method of strong carbon secreting type modified biochar
  • A kind of preparation method of strong carbon secreting type modified biochar

Examples

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Effect test

Embodiment 1

[0036] A preparation method of strong carbon-mimicking type modified biochar, the steps are as follows:

[0037] (1) Take the root of the wetland plant Luzhu root, wash it, chop it into pieces with a diameter of 1 to 3 cm, and air-dry it to constant weight;

[0038] (2) Under the protection of nitrogen, the wetland plants treated in step (1) are rapidly carbonized at a low temperature by dry distillation to obtain biochar; the dry distillation temperature is 300° C., and the heating rate is 8° C. / min , dry distillation time 60min;

[0039] (3), load modification treatment: the biochar prepared by step (2) is mixed with the ferrous chloride solution of 3mol / L, leave standstill 12h to carry out loading ferrous, the biochar after the load is washed with deionized water until neutral, and then dried in an anaerobic environment at 105°C for 12 hours to obtain a strong carbon-leaching modified biochar, such as figure 2 shown.

Embodiment 2

[0041] A preparation method of strong carbon-mimicking type modified biochar, the steps are as follows:

[0042] (1) Wash the wetland plant willow stems of wetland plants, wash and chop into pieces with a diameter of 1-3 cm, and air-dry to constant weight;

[0043] (2) Under the protection of nitrogen, the wetland plants treated in step (1) are rapidly carbonized at a low temperature by dry distillation to obtain biochar; the dry distillation temperature is 250° C., and the heating rate is 5° C. / min , dry distillation time 40min;

[0044] (3), load modification treatment: the biochar prepared by step (2) is mixed with the ferrous chloride solution of 2mol / L, leave standstill 14h to carry out loading ferrous, the biochar after the load is washed with deionized water until Neutral, and then dried in an anaerobic environment at 100°C for 12 hours to obtain a strong carbon-secreting modified biochar.

Embodiment 3

[0046] A preparation method of strong carbon-mimicking type modified biochar, the steps are as follows:

[0047] (1) Take wetland plant water brocade stems of wetland plants, wash and chop into pieces with a diameter of 1 to 3 cm, and air-dry to constant weight;

[0048](2) Under the protection of nitrogen, the wetland plants treated in step (1) are rapidly carbonized at low temperature by dry distillation to obtain biochar; the dry distillation temperature is 320°C, and the heating rate is 8°C / min , dry distillation time 60min;

[0049] (3), loading modification treatment: the biochar prepared in step (2) is mixed with the ferrous chloride solution of 2.5mol / L, left to stand for 14h to carry out loading ferrous, and the biochar after loading is washed with deionized water to neutral, and then dried in an anaerobic environment at 110°C for 12 hours to obtain a strong carbon-absorbing modified biochar.

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Abstract

The invention relates to a preparation method of strong carbon-secreting modified biochar. In the method, under the protection of an inert gas, the processed wetland plants are subjected to rapid carbonization treatment at a low temperature through dry distillation to obtain biochar; Mix 0.5-3mol / L ferrous chloride solution, let it stand still to load ferrous, anaerobically dry after washing, and obtain strong carbon-secreting modified biochar. From the perspective of plant resource utilization, the preparation method of the present invention has sufficient raw materials and rich types, and the porous characteristics of wetland plants have inherent advantages over other biomass raw materials. The low-temperature dry distillation preparation method has low carbonization temperature, short carbonization time, and rapid temperature rise, and its organic carbon dissolution capacity is much higher than that of biochar prepared at high temperatures (>400°C). It is used to strengthen the denitrification of constructed wetlands and has achieved unexpected results.

Description

technical field [0001] The invention relates to a method for preparing biochar, in particular to a method for preparing strongly carbon-secreting ferrous-loaded ferrous-modified wetland plant biochar, belonging to the technical field of environmental engineering sewage treatment Background technique [0002] Constructed wetland, as a unique composite ecological sewage treatment technology composed of plants, substrates, microorganisms, etc., has outstanding application advantages in the advanced treatment of tail water of sewage treatment plants in developing areas, and has gradually become a common method for deep purification of sewage. One of the emerging methods. However, due to the low carbon-to-nitrogen ratio and high nitrate nitrogen content in the tail water that meets the standards, the denitrification and denitrification effect of constructed wetlands is often inhibited. In addition, the area of ​​wetland plant biomass produced in my country every year amounts to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/32C02F101/16
CPCC02F3/32C02F3/34C02F2003/003C02F2101/163C02F2101/166C02F2209/16Y02W10/10
Inventor 范金林李静刘菲菲张建张成禄
Owner SHANDONG UNIV
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