An efficient system for carbonation of high-rate algae pond water to enhance CO2 mass transfer.

Abstract:

:High-rate algal ponds have the potential to produce 59 T of dry biomass ha(-1)year(-1) based on the specific productivity of 20 g m(-2) day(-1). Atmospheric air provides only 5% of the CO(2) to the pond surface required for photosynthesis. Hence, CO(2) is usually provided via bubbling of concentrated CO(2)-air mixture into the algae ponds. This process is, however, not significantly effective in terms of mass transfer. Use of bubble column to increase the interfacial area of contact available for gas exchange is proposed as an efficient alternative. A carbonation column (CC) was modeled and designed to measure CO(2) absorptivity in-pond water at various pH regimes. The CC performed at 83% CO(2) transfer efficiency. An air-to-pond mass transport coefficient of 0.0037 m min(-1) was derived. The proposed device can be used with any exhaust gas stream with higher concentrations of CO(2) in conjunction with raceways for optimizing algae production.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Putt R,Singh M,Chinnasamy S,Das KC

doi

10.1016/j.biortech.2010.11.029

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

3240-5

issue

3

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(10)01831-6

journal_volume

102

pub_type

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