Modified biochar algistat as well as use method and preparation method thereof

A technology of biochar and algae inhibitor, which is applied in the field of water pollution treatment, to achieve the effect of fast adsorption, easy to obtain and cheap source, and save the time of algae inhibition

Pending Publication Date: 2021-08-20
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual water body, it is not yet known whether the modified biochar can achieve good algae inhibition effect.

Method used

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  • Modified biochar algistat as well as use method and preparation method thereof
  • Modified biochar algistat as well as use method and preparation method thereof
  • Modified biochar algistat as well as use method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of modified biochar algae inhibitor, the specific steps are as follows:

[0032] The dried rice straw was crushed and passed through a 200-mesh sieve, and then 1.0 g of biomass raw material under the sieve was added to 100 ml of 2.5 g / L magnesium chloride, stirred for 24 hours, evaporated and crystallized. Four parts of biomass after appropriate crystallization were taken and placed in four crucibles respectively. Wrap the crucible containing the biomass with tin foil, and place it in a nitrogen-filled box-type atmosphere furnace for anaerobic carbonization; set the target temperatures of the four crucibles at 400°C, 500°C, 600°C, and 700°C, respectively, and set the temperature at 5°C / Heating at a heating rate of min to the target temperature, continued carbonization at the target temperature for 2 h, and naturally cooled to room temperature to obtain four different magnesia-based biochars, which were sealed and stored for future use, respectively...

Embodiment 2

[0036] The modified biochar algae inhibitors prepared at different carbonization temperatures carry out the algae inhibition method, and the specific process is as follows:

[0037] Step 1: Take the microcystis aeruginosa algae liquid grown to the logarithmic phase cultured by BG11 without any pretreatment.

[0038] Step 2. Add four parts of 0.4 g of modified biochar algicides prepared at different calcination temperatures (i.e. BMC400, BMC500, BMC600 and BMC700) to four parts of 100 mL of algae suspension, and the magnetic stirring speed is set to 100 rpm. After reacting for 5 minutes, place a strong magnet at the bottom of the reactor and let it stand for 10 minutes.

[0039] Step 3: Take four samples of the supernatant of the algal suspension, measure the concentration of chlorophyll a, and determine the removal rate T of the microcystis aeruginosa cells by the modified biochar algicides prepared at four different carbonization temperatures.

[0040] The cell removal rate ...

Embodiment 3

[0045] The comparison of algae inhibitory effect of BMC600 modified biochar algae inhibitor under different dosage and different treatment time is as follows:

[0046] Step 1: Take the microcystis aeruginosa algae liquid grown to the logarithmic phase cultured by BG11 without any pretreatment.

[0047]Step 2: Using BMC600 modified biochar to conduct four sets of algae inhibition tests on the suspension of Microcystis aeruginosa. In each group of algae inhibition tests, the amount of algae suspension was 100ml, and the magnetic stirring speed was set at 100rpm. The dosages of BMC600 modified biochar in the four groups of algae inhibition tests were 0.5, 1.0, 2.0, 3.0, 4.0 g / L respectively. For each group of algae inhibition tests, samples were taken at 0, 1, 2, 3, 4, and 5 minutes after the catalyst was added, and the chlorophyll a concentration of the samples was measured, and the removal rate T of Microcystis aeruginosa cells was calculated respectively.

[0048] The relati...

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Abstract

The invention discloses a modified biochar algistat as well as a use method and a preparation method thereof. The algistat is obtained by modifying magnesium oxide-based biochar through ferroferric oxide. The nano-modified biochar is used for algal inhibition and algal toxin adsorption, and the raw materials are rich in source, low in price and easy to obtain. According to the composite catalyst, a solution can be rapidly clarified and transparent in the algal inhibition process, flocculates which have magnetism and are easy to settle are formed, and the modified biochar is convenient to recycle and reuse. Besides, the modified biochar used in the invention does not need to pre-treat an algae solution (namely a process of removing a culture medium, including centrifugation and washing) in the algae inhibition process, so that effective algae inhibition can be realized, and the time consumed by algae inhibition is less. While the algal inhibition time is saved, the algal inhibition efficiency same as or higher than that of the existing algal inhibition process is achieved.

Description

technical field [0001] The invention relates to a preparation method of modified biochar based on rice straw and its application in the process of inhibiting algae and adsorbing microcystin, belonging to the technical field of water pollution treatment. Background technique [0002] Global warming, greenhouse effect, water eutrophication and other global problems have intensified, and cyanobacteria blooms caused by a large amount of nitrogen and phosphorus pollutants from industry and agriculture into lakes and reservoirs have become the focus of attention and research by scholars at home and abroad. According to the data reported by the Ministry of Ecology and Environment, as of August 4, 2020, 33 of the 97 key lakes (reservoirs) in the country are still in a state of eutrophication, and the status of cyanobacteria blooms in eutrophic lakes is still severe. At the same time, algae toxins secreted by cyanobacteria can inhibit the growth and reproduction of other organisms in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/28B01J20/20B01J20/30
CPCC02F1/5236C02F1/288B01J20/041B01J20/06B01J20/20
Inventor 张杭君李惜子张炜文
Owner HANGZHOU NORMAL UNIVERSITY
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