Chlorella Vulgaris Biochar Experiment

By:Mr Evan Wang
Position:Managing Director
Nov 10, 2023
Commissioned by American researchers, SIMEC conducted pyrolysis experiments on Chlorella vulgaris in accordance with the research and development agreement. Raw material is 15 kg Chlorella Vulgaris dry powder sourced from supplier. Packed in foil pouch and cardboard drum. Chlorella Vulgaris is a kind of microalgae which is widely distributed in China.
Microalgae are a diverse group of aquatic, photosynthetic organisms, which are typically unicellular. As a new type of energy crop, microalgae have many advantages over other feedstocks, such as impressive productivity, noncompetition with agriculture, flexibility on water quality, mitigation of CO2, and broad product portfolio.
Chlorella Vulgaris and Pyrolysis Laboratory Apparatus
Chlorella Vulgaris
Cholrella Vulgaris in Feeding Screw
Product Name: Chlorella Powder                                                    Latin Name: Chlorella Vulgaris
Batch Number: CP0420230420                                                      Date of Production:20230420
Shelf Life: three years                                                                     Expiry Date: 20260419
Plant Part: Whole plant
Test Items Standard Results Test Methods
Appearance Fine Uniform Powder Complies Visual
Protein ≥50% 56.3% GB5009.5-2010
Colour Blue Green To Green Complies Visual
Chlorophyll ≥1% 1.5% SNT 1113-2002
Moisture ≤7% 3.9% GB5009.3-2016
Ash ≤8% 4.7% GB5009.4-2016
Pb ≤1 ppm 0.10 ppm GB 5009.12-2017
As ≤1 ppm 0.17 ppm GB 5009.11-2003
Cadmium ≤0.2 ppm 0.02 ppm GB 5009.15-2014
Hg ≤0.1ppm 0.01 ppm GB 5009.17-2003
Total Bacteria ≤100,000cfu/g 10,000 GB 4789.2-2010
Coliforms Not detected Not detected GB_4789[1].3-2010
Yeast and Mould ≤1000cfu/g <90cfu/g GB 4789.15-2010
Staphylococcus Not detected Not detected GB 4789.10-2010
Salmonella Not detected Not detected GB 4789.4-2010
Shigella Not detected Not detected GB 4789.5-2003
Mesh 100% through 80 mesh Complies  
To store at 0℃-20℃ and to avoid light and heat.

Purposes and Objectives of Test Work:
1.Understand mass balance on difference process in order to understand Yield of biochar from a given amount of algae.
2.Biochar samples produced from the three strains of algae. At least 0.5 Kg of each sample.
3.Three sample of the bio-oil produced from the three strains of algae.
4.System data generated during operation of the pyrolysis unit, including reaction temperature, retention time, gas volume, gas composition, pressure, etc.
Biomass Pyrolysis Laboratory Apparatus
Pyrolysis Laboratory Apparatus with Biogas Flame
The 1st Run of Chlorella Vulgaris Pyrolysis
Date 1st August, 2023
Experimental Equipment: biomass pyrolysis laboratory apparatus designed by SIMEC.
Raw Material: Chlorella powder, moisture content less than 7%, bulk density 0.4-0.5 g/cm3.
Pyrolysis Temperature: 300 degree Celsius.
Residence Time: 20 minutes.
Weight Before Pyrolysis, Weight After Pyrolysis, and Yield of Biochar is confidential and not permitted to be disclosed to public.
Features of Biochar: dark green color, in the form of both chunks and powder. The chunks are hard but can be pressed to crack by hand. There’s a pungent smell.

Yield of Bio-oil is confidential information.
Features of Bio-oil: a viscous liquid of dark brown color; It emits a very pungent odor, which is easily volatilized into the surrounding air, and immediately causes extreme discomfort in the nasal cavity and eyes after inhalation.
Yield of Gases and Gas Composition is confidential and not permitted to be disclosed to public.
Gas pressure inside the carbonization reactor is regulated to be minus 0.1 Kpa. Gas temperature is 34.5 degree Celsius after condensation.
Bio-oil in Bottles
Upon the receipt of the Chlorella Vulgaris, pyrolysis was conducted on 5kg in triplicate (a total of 3 runs, each using 5kg) at a temperature of 300 degree Celsius with a residence time of 20 minutes.
The 2nd Run of Chlorella Vulgaris Carbonization was on 8th August, 2023. The 3rd Run was on 18th August, 2023, using the same biomass pyrolysis laboratory apparatus designed by SIMEC.
Through the tests, it can be confirmed the production yield of algae based biochar is much higher than woody biomass. We will continue to explore its feasibility in commercial projects.
© Copyright of articles and pictures on this site belongs to SIMEC. Any company, media, website or individual are not allowed to reprint, reproduce, repost, modify or use in other ways without permission. Otherwise SIMEC will have the right to pursue legal responsibilities.