Method for purifying microalgae biomass harvested by coagulation and recycling coagulant

A coagulant and biomass technology, applied in the field of microalgae cultivation, can solve problems such as operational complexity, gas leakage, and storage difficulties, and achieve the effects of reducing negative impacts, reducing process costs, and wide applicability

Active Publication Date: 2017-08-29
GUOTOU BIO TECH INVESTMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorine-containing salts in this method are salts such as sodium chlorate and sodium hypochlorite, which are oxidizing, costly, and difficult to store. Although the chlorine dioxide gas produced is collected and reused, the operation complexity of gas collection will be high. Safety issues such as gas leakage

Method used

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  • Method for purifying microalgae biomass harvested by coagulation and recycling coagulant
  • Method for purifying microalgae biomass harvested by coagulation and recycling coagulant
  • Method for purifying microalgae biomass harvested by coagulation and recycling coagulant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] see figure 2 , figure 2 It shows the comparison of the recovery efficiency of iron salt and PAC recovered from Scenedesmus after harvesting Scenedesmus with iron salt and PAC as coagulants respectively.

[0053] Experimental conditions: iron salts (FeCl 3 ) and PAC (purchased from Shanghai Sinopharm) to coagulate and harvest Scenedesmus, use acidic eluent to elute and recover the coagulant in Scenedesmus and purify the biomass. The samples of the same volume were taken from the same microalgae culture tank, the dosage of PAC was 9.8 mg / g (9.8 mg of PAC was added to each gram of algal liquid), and the pH was adjusted to 6.2±0.2; FeCl 3 The dosage is 40mg / g (add 40mg FeCl to each gram of algae liquid 3 ). When eluting with an acidic eluent, use HCl=0.1mol / L, and liquid-solid ratio=200ml / g. After elution, the collected supernatant was adjusted to pH 5-8 by using NaOH=5mol / L to obtain hydroxide precipitation. Settling and centrifuging to obtain the hydroxide of the ...

Embodiment 2

[0056] see image 3 , image 3 A graph showing the comparison of recovery efficiencies of aluminum salt coagulants from coagulation-harvested different microalgal biomass (Scenesus, Chlorella, and Haematococcus pluvialis).

[0057] Experimental conditions: For Scenedesmus acuminatus, Chlorellasorokiniana, and Haematococcus pluvialis, the algal liquids were harvested by coagulation; 3+ After (aluminum sulfate), adjust pH=6.2±0.2; during acid washing, HCl=0.1mol / L, liquid-solid ratio=200ml / g.

[0058] After elution, the collected supernatant was adjusted to pH 5-8 by using NaOH=5mol / L to obtain hydroxide precipitation. Settling and centrifuging to obtain the hydroxide of the recovered coagulant with very low water content, adding sulfuric acid to it, and completely neutralizing and dissolving the hydroxide, that is, the concentrated recovered coagulant aluminum sulfate is obtained.

[0059] The experimental results are as image 3 shown. Under the above-mentioned experiment...

Embodiment 3

[0062] see Figure 4-5 . in Figure 4 A graph showing the comparison of the harvesting efficiency of the freshly prepared aluminum salt solution and the aluminum salt solution recovered by the method of the present invention as a coagulant for harvesting microalgae.

[0063] Figure 5 The photo shown is a photo of the microalgae sedimentation after the newly prepared aluminum salt solution and the recovered aluminum salt solution are added as a coagulant to a beaker containing algae liquid, and the same time (15 min) has elapsed.

[0064] Experimental conditions: Take Scenedesmus acuminatus and aluminum sulfate as examples, use acidic eluent to recover aluminum salt coagulant, and study the recovery of coagulant according to the method of the present invention when it is used for harvesting microalgae, its harvest Whether the efficiency will be consistent with the harvest efficiency of the analytically pure coagulant purchased by the original factory (purchased from Shangha...

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Abstract

The invention relates to a method for purifying microalgae biomass harvested by coagulation and recycling a coagulant. The method comprises eluting, converting and recycling. The eluting comprises the following steps: adding an acid eluent into the microalgae biomass harvested by coagulation, performing a homogenizing operation so that the acid eluent and the microalgae biomass form a mixture, centrifuging or standing, and collecting the clear liquid and the microalgae biomass respectively; the converting comprises a step of adding a strong base into the clear liquid, wherein a slightly soluble or insoluble hydroxide is formed in the clear liquid; the recycling comprises the following steps: separating the slightly soluble or insoluble hydroxide, and neutralizing the slightly soluble or insoluble hydroxide with acid liquid to obtain a high-concentration coagulant to realize recycling of the coagulant. The method provided by the invention can realize biomass purification and coagulant recycling; moreover, the recycled coagulant has a remarkably enhanced coagulation harvesting efficiency. The invention also provides a coagulant with an efficient coagulation effect and a microalgae coagulation harvesting method.

Description

technical field [0001] The invention belongs to the field of microalgae cultivation, and in particular relates to the recovery and reuse technology of microalgae harvesting and resources. Background technique [0002] An important link in microalgae cultivation is the harvest of microalgae. Because microalgae are single-celled organisms, they are usually small in size. Generally, the diameter of the cells ranges from a few microns to a dozen or so microns. Therefore, after they are cultivated in the water body to maturity, the difficulty of harvesting and the cost of energy consumption are relatively high. This is also a reason that restricts the industrial application of microalgae. [0003] The application of microalgae coagulation harvesting method to the harvesting of microalgae cells has many advantages. First, it is simple and easy to operate, does not require any expensive special equipment system, and belongs to a low-cost and energy-free process. The key is to ens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52B01D21/01C12N1/12C12R1/89
CPCB01D21/01C02F1/52C02F1/5236C12N1/12
Inventor 张学治杨琳王岚胡强
Owner GUOTOU BIO TECH INVESTMENT CO LTD
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