Rupert J. Craggs

TL;DR: The critical parameters that limit algal cultivation, production and harvest are reviewed and practical options that may enhance the net harvestable algal production from wastewater treatment HRAPs including CO(2) addition, species control, control of grazers and parasites and bioflocculation are discussed.

TL;DR: In this article, the construction and operation of a 5-ha high-rate algal ponds (HRAP) system treating primary settled wastewater at the Christchurch wastewater treatment plant, New Zealand is discussed.

TL;DR: This research shows that the wastewater treatment HRAPs with CO(2) addition achieved a mean algal productivity of 16.7 g/m(2)/d, which is higher than the maximum algae productivity for the HRAP(4d) (4 d HRT), and higher bacterial composition and the larger size of algal/bacterial flocs of theHRAP(8d) biomass increased harvestability.

TL;DR: Algae biofuels (e.g. biogas, ethanol, biodiesel and crude bio-oil), could be produced from the algae harvested from wastewater HRAPs, with biofuel and recovered nutrient fertilizer being by-products, and greenhouse gas abatement results from both the production of the bio Fuels and the savings in energy consumption compared to electromechanical treatment processes.

TL;DR: Results indicate that recycling gravity harvested algae could be a simple and effective operational strategy to maintain the dominance of readily settleable algal species, and enhance algal harvest by gravity sedimentation.