What is the advantage of growing algae in an algae bioreactor PBR over growing them in an open pond ...........

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What is the advantage of growing algae in an algae bioreactor (PBR) over growing them in an open pond ?

1.Algae grown in PBR are not susceptible to contamination from native species as is the case in an open pond.

2.The ability to control the density of algae cell colonies in a PBR more easily than an open pond leads to higher productivity in a PBR.

Which of the above is/are correct ?

1 only

2 only

Both 1 and 2

None

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Explanation:

PBR is an enclosed, lighted, algal culture vessel designed for controlled production of algae.
Photo bioreactors, have several major advantages over open ponds, they can:

Statement 1: Prevent contamination: One of the biggest problems with opens ponds (in my view anyway) is they are susceptible to contamination from invading and/or native species. In a PBR all inputs are completely controlled by you, not chance or nature. This is a HUGE advantage.
Allow you to grow algae in any climate: This is one of the main reasons for a PBR. It allows you to grow algae easily and cheaply in almost any climate. Open ponds are an unacceptable alternative in many colder climates.
Bioreactors offer better control over existing conditions: Since you’re controlling all the inputs, you can also (better) control the existing conditions of your algal experiments. Meaning climate, light, temperature, Ph balance, nutrients, etc.
Statement 2: Permit higher cell concentrations: Because you’re controlling the parameters of the PBR, you can also control the density of your cell colonies. While possible in an open pond, it is much easier in a PBR.
However, it is costly, difficult to set up and requires technical expertise which is not easy to come by for an ordinary algae farmer with limited resources.

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