Microalgae for Web

8/17/2019 Microalgae for Web

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Design of a MicroalgaeBiodiesel ProductionSystem

BY: Zimu MG

Lebotsa MGMamabolo M


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Imagine if we could? Grow a fuel witout using land! Grow fuel witout "olluting te

atmos"ere! Grow a fuel witout creating

greenouse gases!

#ar$est a cro" e$ery day instead ofyearly! Grow cro"s in bot fres and sea water!

Well we can! Microalgae will do these%&ai"ei! '(()*


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Pro+ect ,b+ecti$es Design of an e-"erimental

microalgae "roduction system

Design of a $ariable control systemfor growing conditions of

microalgae. Design suitable ar$esting and

drying system for microalgae.


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/at are Microalgae? Microalgae are 012( microns in si3e! &ere are tousands s"ecies of algae

Po"ulations $ary wit climate andtem"erature 4ll contain li"id oils and! #a$e been studied as a source of

Biodiesel for more tan '( years! 4re te source of oil! gas and "lanet5s

,' 4bsorb most of te "lanet5s 6,'

A pretty good CV


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Microalgae Growt

MicroalgaeCO2

T em p er a t ur e

pH

W a t e

r

L i gh

t

A gi t a t i on

N u t r i en t s


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System Layout


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System Layout

Air flow

regulators

Control

system

The Algae


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Design 7eatures Pond wit stand Paddleweel 6ontrol system

6,' su""ly system

"# control

&em"erature control 8utrients su""ly

#ar$esting and drying system


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Production Pond 0 4im: &o design a small

e-"erimental "ond 4 raceway "ond system was

selected! based on literaturere$iews

Design "ro"erties mainly based onagitation metod


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Pond design ' 9nsure de"t of ( cm! 7rom algae "ro"erties Pond dimensions :(( mm dee"! 2 m long! 0.'

m wide! eac cannel being (.;) m! .)2 m'surface area! o$erall ca"acity of 0


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Pond Stand 0 &o ele$ate "ond system for

"ortability and ease of wor=ing

wit te "ond system. 4""ro-imately 0((( litres! /eigt

of 0(=8

Design based on te steel %S48S0(0>'* code of "ractice


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Pond stand '


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6,' su""ly system

"# control




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Pond #eating 4im: &o be able to control te "ond

tem"erature wen necessary

es"ecially at nigt 6alculated .2 =/ "ower reuired Su""lied by =/ element @sing 0A am"s! '( olts


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6,' su""ly system

"# control




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Paddle /eel 0 &otal Power

reuired to

agitate C (.22 / Ma- S"eed C 2).<

r"m

#'( %s"eed* C (.'

ms


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Paddle /eel '

Ma- S"eed C

;


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Design 7eatures

Pond wit stand Paddleweel 6ontrol system

6,' su""ly system

"# control




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6,' Su""ly System

&wo ty"esgases 6om"ressed

air

Pure 6,' 7low rate C 01'

litermin


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Design 7eatures


6,' su""ly system

"# control




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6ontrol System 4lgoritm


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6ontrol System Layout


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Design 7eatures


6,' su""ly system

"# control




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#ar$esting and Drying 0

#ar$esting is te separation of microalgaecells from medium of water %/aites! '((0*.

4nd as ma+or im"act in te "roduction line ofmicroalgae.

/ile drying is furter removal of water

from te harvested biomass.

4nd It "rolongs te self1life of microalgae!more es"ecially if te biomass is te Enal"roduct %Grima et al. '(('*.


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#ar$esting and Drying '

4ims: Se"arate algae from te medium

of water. ,btain si3e range of te algae

grown! Determine te mass of algae! and Dry te algae obtained from "ond.


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#ar$esting and Drying 2

Gravity ltration consists of: &ree mes trays: (.'! (.0' and (.00

mm. steel stand! buc=et! and

basin. Sun drying consists of:

6om"onents of te gra$ity Eltration.

But wit one mes tray.


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6onstruction 0

Unsafe mesh tray

Final mesh tray


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6onstruction '

Welds

Top view of the steel stand


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6om"lete Manual Gra$ity7iltration

Basin

Bucket

Steel stand with mesh

trays


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&esting 0

Algae obtained from the

0!! mm mesh tray

Water retained

after harvesting

Water from the pond

before harvesting


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&esting '

Algae at the top of the

moving water

"o agitation Algae settles


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&esting 2

Tree stalks# flies

$ried algae


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Fesults 0

00:00:00 0:!:00 0":#$:00 %:2:00 %":%2:00 00:00:00 0:!:00&'"

!

!'%

!'2

!'#

!'

!'(

!'$

!'&

p% vs Time

)ay % )ay 2

Time &hrs'

p%


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Fesults '

00:00:00 0:!:00 0":#$:00 %:2:00 %":%2:00 00:00:00 0:!:000(

%0

%(

20

2(

#0

#(0

Air and (ond Temperature vs Time

Air Temperature *on+ Temperature

Time &hrs'

Temperature &deg)'


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Fesults 2

0":#$ %:2 %":%2 00:00 0:! 0":#$ %:2

0

(

%0

%(

20

2(

#0

#(

,raph of pH an+ Temperature against the time of the +ay

Temperature

pH

)ay Time -hr inter.als/

pH an+ Temperature -+egC/


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6onclusion 0

"# control $ia 6,' bubbling! was

successful and sowed increase

growt in algae &em"erature control at a large

scale is not feasible

@nable to uantify biomass from"ond

4gitation is im"ortant for growt


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6onclusion '

Metod of settling te algae can beused to ar$est

4lgae grown was a mi-ed cultureand is not Elamentous

Gra$ity Eltration can also be used

to remo$e dirt. Drying not acie$ed.


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6allenges

Mainly in construction Deli$ery delays 4lgae IP 4ttaining s"eciEc s"ecies


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Fecommendations 0

Design for a s"eciEc s"ecies ty"e!and End s"ecies culture %main

callenge* 6ontinuous ar$esting as o""osed

to batc

Im"act of ow rates on te growtof microalgae &esting of microalgae in te

laboratory! for ty"e and oil content


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Fecommendations '

7or un=nown algae! te use ofsettling "ond is an ad$antage.

,ter metods of ar$esting anddrying still need to be in$estigated.


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Conceptual Algae plant

%&ai"ei! '(()*


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4c=nowledgements 0

Professor H6 Smiters Louis Lagrange Dr D 6iol=os3 4llan #ill Mbuso 6ele 4F6 Professor F Perissinotto Professor 7 Bu- Dr 7 Inambao Prof D Stretc


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4c=nowledgements '

Facel Broo=s 9li3abet &rigger Sfundo 9 8=omo Faisan 8aidoo

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