Process for preparing short chain fatty acids by hydrophyte

A short-chain fatty acid and aquatic plant technology, which is applied in the field of short-chain fatty acid preparation by using aquatic plants, can solve the problems of long-term operation instability, troublesome processing technology, and low processing efficiency, so as to facilitate transportation and downstream process utilization, and improve conversion Efficiency, the effect of simple processing technology

Active Publication Date: 2008-10-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method of using aquatic plants as raw materials to prepare short-chain fatty acids, so as to overcome the disadvantages of troublesome follow-up treatment process and low processing efficiency of existing aquatic plants, and overcome the high cost of raw materials and long-term operation of existing anaerobic fermentation technology The shortcomings of instability can effectively treat a large number of aquatic plants produced by purifying water, reduce the production cost of short-chain fatty acids, and improve the working efficiency of anaerobic reactors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Utilize aquatic plant water hyacinth to prepare short-chain fatty acids

[0015] 1. Collect water hyacinth from river water bodies, dry it, and use a crushing machine to break it into particles less than 8mm in length; prepare a solution at a volume ratio of 1:1 of water and Peifen buffer, and then add the crushed water hyacinth dry material to 5-10g / L, stir well and use it as feed liquid for aquatic plants. Described Puffin's buffer is used with reference to the rumen purebred microorganisms degrading cellulose reported in the U.S. "Applied and Environmental Microbiology" (Applied and Environmental Microbiology, Pavlostathis SG, Miller TL, Wolin MJ, 1988, 54 (11), 2655-2659) The buffer solution is composed of: sodium bicarbonate 5g / L, disodium hydrogen phosphate 1.9g / L, potassium chloride 0.5g / L, sodium chloride 0.5g / L, magnesium chloride 0.13g / L, calcium chloride 0.05g / L, urea 0.5g / L.

[0016] 2. In this embodiment, an anaerobic reactor with a total v...

Embodiment 2

[0021] Example 2: Preparation of short-chain fatty acids by using the aquatic plant cattail

[0022] 1. Collect the aquatic plant cattail, dry it, and use a crushing machine to break it into particles with a length of less than 8mm; prepare the solution according to the volume ratio of water and Peifen buffer at 1:2, and then add the crushed cattail dry material to 5-30g / L, stirred and mixed evenly, used as feed liquid for aquatic plants. The composition of described Peifen buffer solution is: sodium bicarbonate 5g / L, disodium hydrogen phosphate 1.9g / L, potassium chloride 0.5g / L, sodium chloride 0.5g / L, magnesium chloride 0.13g / L, chloride Calcium 0.05g / L, urea 0.5g / L.

[0023]2. In this embodiment, an anaerobic reactor with a total volume of 4.9L is used, and the volume of the reaction zone is 2.5L. Heating and controlling the temperature of the reactor to 35° C., and the stirring rate to 100 rpm. After inoculation, the sludge concentration in the reactor is 20g / L, and th...

Embodiment 3

[0028] Embodiment 3: utilize aquatic plant canna and reed mixture to prepare short-chain fatty acid

[0029] 1, collect aquatic plant reed and canna, dry, be 1: 0.5-1.5 by the weight ratio of canna and reed, use pulverizer to break up the mixed raw material granule that length is less than 8mm; Prepare a solution at a ratio of 1:2, then add crushed reed and canna mixed raw material particles to 5-30g / L, stir and mix evenly, and use it as a feed liquid for aquatic plants. The composition of described Peifen buffer solution is: sodium bicarbonate 5g / L, disodium hydrogen phosphate 1.9g / L, potassium chloride 0.5g / L, sodium chloride 0.5g / L, magnesium chloride 0.13g / L, chloride Calcium 0.05g / L, urea 0.5g / L.

[0030] 2. The total volume of the anaerobic reactor used is 4.9L, wherein the volume of the reaction zone is 2.5L, the temperature of the reactor is controlled to be 35°C, and the stirring rate is 100 rpm. After inoculation, the sludge concentration in the reactor is 30g / L, a...

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Abstract

The invention relates to a method for preparing short chain fatty acid through aquatic plant. The method is characterized by comprising the following: a step of preparing solution according to the water PBS buffer fluid volume ratio of 1 to 1-3 and adding crushed dry matter of the aquatic plant into the solution according to the proportion of 5-30g/L; a step of adding feeding fluid with aquatic plant concentration of 5-10g/L into a reactor with sludge concentration of 10-30g/L and operating temperature of 25-45 DEG C at the adding speed of 0.5-2.0L/d and controlling the PH value ranging from 5.5 to 6.5 through baking soda; a step of discharging residue according to the proportion of 0.05-0.25L/d; a step of completing sludge acclimation when methane is not detected in the produced gas; a step of adding feeding fluid with aquatic plant concentration of 10-30g/L; and a step of controlling the PH value ranging from 5.5 to 6.5 until the reactor operates stably with degradation efficiency reaching 55-70 percent to obtain the short chain fatty acid mixed liquid which contains acetic acid, propaneoic acid and butyric acid and can be used as chemical raw material with high value added. The solid residue can be reused as raw material.

Description

technical field [0001] The invention belongs to the technical field of methods for processing and utilizing aquatic plants in the environmental protection technology, and in particular relates to a method for preparing short-chain fatty acids by using aquatic plants as raw materials and utilizing microbial anaerobic fermentation. Background technique [0002] Aquatic plants are often used to absorb nutrients such as nitrogen and phosphorus in the water body, so as to purify the water body and achieve the purpose of water body environmental protection, but at the same time, it will cause a large number of aquatic plants to deal with problems. Among the current follow-up utilization technologies of aquatic plants, Chinese Patent Publication No. CN1307838 mentions extracting nutrients from aquatic plants to process and refine medicines and feed additives, but the process is cumbersome and the extraction cost is high; Chinese Patent Publication No. CN1428314 The mentioned method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/52C12P7/54C02F11/04
CPCY02E50/343Y02E50/30
Inventor 俞汉青岳正波刘荣华胡真虎唐勇赵白航
Owner UNIV OF SCI & TECH OF CHINA
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