Preparation method of modified biochar with improved ammonia nitrogen removal ability

A technology of biochar modification, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of environmental secondary pollution, waste of resources, poor effect, etc., and achieve improved removal efficiency, sufficient raw materials, and the effect of reducing secondary pollution

Inactive Publication Date: 2017-01-25
KUNMING UNIV OF SCI & TECH
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because biochar has a well-developed pore structure and the surface is rich in oxygen-containing functional groups such as -COOH, -COH and -OH, they generate a large number of negative charges and can effectively adsorb inorganic ions in water or soil (such as Cu 2+ , Hg 2+ , NH 4 + etc.) and organic compounds, but the current application of biochar to the removal of ammonia nitrogen is not effective
[0005] Yak dung comes from plateau areas. For a long time, yak dung in plateau areas has accumulated in large quantities on grasslands, causing secondary pollution to the environment and waste of resources. The problem of resource utilization of yak dung needs to be solved urgently

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of modified biochar with improved ammonia nitrogen removal ability
  • Preparation method of modified biochar with improved ammonia nitrogen removal ability
  • Preparation method of modified biochar with improved ammonia nitrogen removal ability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the modified biochar that improves ammonia nitrogen removal ability described in this embodiment specifically comprises the following steps:

[0028] (1) Collect yak dung, air-dry it, and then crush it to 0.5~3cm;

[0029] (2) The yak manure obtained in step (1) was heated to 600°C at a heating rate of 5°C / min under the protection of nitrogen gas, and then kept at a constant temperature for 60 minutes, and then naturally cooled with the furnace under the condition of continuous nitrogen flow;

[0030] (3) The biochar obtained in step (2) is pulverized and passed through a 100-mesh sieve to obtain conventional biochar, which is recorded as BC600. Mix the biochar and water evenly at a ratio of 1:4 by mass to volume, and then add the mixture with a volume of 1 The concentration of % is the sodium azide sterilization of 20g / L, and mixes;

[0031] (4) The sterilized mixture in step (3) is subjected to cyclic freezing and thawing, with 24 hours as a...

Embodiment 2

[0041] The preparation method of the modified biochar that improves ammonia nitrogen removal ability described in this embodiment specifically comprises the following steps:

[0042] (1) Collect yak dung, air-dry it, and crush it to 0.5-3 cm;

[0043] (2) The yak manure obtained in step (1) is protected by argon gas, the heating rate is 4°C / min, and the temperature is raised to 450°C for 100 minutes. The furnace is naturally cooled, and the argon is kept open during the cooling period;

[0044] (3) The biochar obtained in step (2) is crushed and passed through a 100-mesh sieve to obtain conventional biochar, denoted as BC450, and the biochar is physically modified. The mass-volume ratio of yak dung biochar to water is 1:3. The ratio is mixed evenly, and the biochar mixed with water is heated to 121°C in a high-temperature sterilization pot for 45 minutes, and then cooled naturally to complete the sterilization;

[0045] (4) The sterilized biochar and water mixture in step (3)...

Embodiment 3

[0049] The preparation method of the modified biochar that improves ammonia nitrogen removal ability described in this embodiment specifically comprises the following steps:

[0050] (1) Collect yak dung, air-dry it, and crush it to 0.5-3 cm;

[0051] (2) The yak manure obtained in step (1) is fed with nitrogen protection, the heating rate is 3°C / min, and the temperature is raised to 300°C for 150 minutes, the furnace is naturally cooled, and the nitrogen is kept open during the cooling period;

[0052] (3) The biochar obtained in step (2) is pulverized and passed through a 100-mesh sieve to obtain conventional biochar, which is denoted as BC300. The biochar is physically modified, and the mass-volume ratio of yak dung biochar to water is 1:2. Mix evenly in proportion, then add 2% of the volume of the mixture to sterilize with sodium azide at a concentration of 15g / L, and mix evenly;

[0053] (4) Step (3) The mixture of sterilized biochar and water is cyclically frozen and th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of modified biochar with improved ammonia nitrogen removal ability. The preparation method includes the specific steps of collecting biomass, subjecting the biomass to air drying, crushing and high-temperature pyrolysis under the protection of inert gas to obtain biochar, pulverizing the biochar prior to sieving, mixing the sieved pulverized biochar with water evenly prior to sterilization, and subjecting the sterilized biochar to circulating freezing and defreezing, suction filtration, drying and grinding so as to obtain the modified biochar. The preparation method has the advantages that the biochar is modified physically, so that the ability of the biochar to adsorb ammonia nitrogen in a water body is improved effectively, the modified biochar can be used for treatment of ammonia-nitrogen-containing wastewater, and biological and efficient utilization of the biomass is achieved.

Description

technical field [0001] The invention relates to a preparation method of modified biochar that improves the ability to remove ammonia nitrogen, and belongs to the field of ecological protection of plateau lakes. [0002] technical background [0003] Nitrogen is one of the important nutrient sources for plants, but excessive nitrogen output will lead to the deterioration of the ecological environment, among which ammonia nitrogen (NH 4 + ) is one of the most common nitrogen pollutants, mainly originating from the use of chemical fertilizers in agriculture, aquaculture, municipal sewage, detergent manufacturing and mineral processing industries. The discharge of ammonia nitrogen into rivers, lakes and other water bodies will lead to eutrophication of water bodies. High concentrations of ammonia nitrogen will cause a sharp decrease in dissolved oxygen concentration in water bodies, causing serious damage to aquatic organisms and the environment. Therefore, reducing the output ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58C02F101/16
CPCB01J20/20B01J2220/4887C02F1/283C02F2101/16
Inventor 黄兵汪艳如罗专溪陈樑侯杰发李金丽
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap