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Scalization harvesting method and device for microalgae producing biological diesel oil

The technology of a harvesting method and harvesting device is applied in the field of large-scale harvesting method and device of biodiesel microalgae, which can solve the problems of low efficiency and high cost, and achieve the effects of simple reaction operation process, low production cost and little environmental pollution

Inactive Publication Date: 2009-11-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the large-scale harvest of microalgae generally adopts membrane filtration method, but the efficiency is relatively low and the cost is high

Method used

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  • Scalization harvesting method and device for microalgae producing biological diesel oil
  • Scalization harvesting method and device for microalgae producing biological diesel oil
  • Scalization harvesting method and device for microalgae producing biological diesel oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 5L of Chlorella to be harvested (the culture period is 10 days, and the initial optical density (OD) value is about 1.5) into the liquid separator, and 5mL of 15mol / L NaOH solution is added to the separator from the alkali storage solution tank. , and reacted for 1 h at normal temperature and pressure (stir for 5 min, then stand for 55 min), and the OD value of the supernatant was measured to be 0.052. After the reaction, the algae settle to the bottom of the liquid separation device, open the control valve at the bottom of the liquid separation device, and release the algae for oil extraction and biodiesel preparation, and the supernatant of the liquid separation is recovered for the cultivation of microalgae. The collected algal liquid and supernatant were sampled for analysis, and the results are shown in Table 1.

Embodiment 2

[0034] Add 5L of Chlorella to be harvested (the culture period is 10 days, and the initial optical density (OD) value is about 1.5) into the liquid separator, and add 1.5mol / L of NaOH solution from the alkali storage solution tank to the liquid separator. 50mL was reacted at normal temperature and pressure for 1h (stir for 3min, then stand for 57min), and the OD value of the supernatant was measured to be 0.083. After the reaction, the algae settle to the bottom of the liquid separation device, open the control valve at the bottom of the liquid separation device, and release the algae for oil extraction and biodiesel preparation, and the supernatant of the liquid separation is recovered for the cultivation of microalgae. The collected algal liquid and supernatant were sampled for analysis, and the results are shown in Table 1.

Embodiment 3

[0036] Add 5L of Chlorella to be harvested (the culture period is 10 days, and the initial optical density (OD) value is about 1.5) into the liquid separator, and add 0.15mol / L of NaOH solution from the alkali storage solution tank to the liquid separator. 500mL was reacted under normal temperature and pressure for 1h (stir for 10min, then stand for 50min), and the OD value of the supernatant was measured to be 0.036. After the reaction, the algae settle to the bottom of the liquid separation device, open the control valve at the bottom of the liquid separation device, and release the algae for oil extraction and biodiesel preparation, and the supernatant of the liquid separation is recovered for the cultivation of microalgae. The collected algal liquid and supernatant were sampled for analysis, and the results are shown in Table 1.

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Abstract

The invention discloses a scalization harvesting method for a microalgae producing the biological diesel oil, including: adding aqueous alkali to the microalgae solution, or adding aqueous alkali and metal salt solution, reacting for 0.5-2 hours at normal temperature and pressure, liquid separation, taking the precipitates at the lower layer, obtaining the concentrated microalgae. The invention also discloses a device. The method has simple operation, low costs, less environmental pollution and can be in scalization. After harvesting, the excessive alkali in water reacts with the feed CO2 in the culture process to generate carbonate precipitates which are collected together with the microalgae, thus, the water can be recycled.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a large-scale harvesting method and device of biodiesel microalgae. Background technique [0002] Microalgal oil, also known as single-cell oil, can be used to make biodiesel. Microalgae has a strong oil production capacity, which is 30 times that of soybeans. Compared with other oil crops, microalgae cultivation requires the least area to produce biodiesel, and at the same time, non-cultivated land such as tidal flats and wasteland can be used. Due to the advantages of small climate impact, low production cost, and short production cycle, microalgal oil has great potential for development. In the past 10 years, with the rapid development of the world economy, the use and consumption of a large amount of fossil energy has led to serious depletion of energy and deterioration of the environment, especially CO2. 2 The sharp increase in emissions causes a seve...

Claims

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Application Information

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IPC IPC(8): C12N1/12C12M1/00
CPCC12M33/20C12M47/02
Inventor 黄和郑洪立高振金平任路静张齐
Owner NANJING UNIV OF TECH
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