A novel growth method for diatom algae in aquaculture waste water for natural food development and nutrient removal

Abstract

Diatom algae are known to play an important role as primary producers in many diverse ecosystems, including artificial aquaculture ponds where they also aid in maintaining water quality by consuming excess nutrients. But factors influencing their growth are still poorly understood. In the present study the effect of micronutrients, N:P ratio and silica concentration on benthic diatom Synedra sp. grown in fish pond waste water was studied along with nutrient removal efficiency. We have studied nine different treatments, of which addition of micronutrient mixture Nualgi along with adjusted N:P to 6:1 resulted in highest cell density, followed by silicate enrichment, whereas only N:P adjustment and Nualgi addition had no significant effect on diatom growth. At the end of the growth experiment, the N removal efficiencies of treatment groups (50.23%-65.44%) were significantly higher (P < 0.05) than that of the control group (43.56%), whereas phosphate removal efficiency was significantly higher (P < 0.05) with Nualgi and N:P adjustment (53.37%-68.98%). The silicate consumption was significantly higher in the control group, at 63.87%, than in other experimental groups. These results will give us a new insight into important factors influencing beneficial algae growth and simultaneous nutrient removal from aquaculture waste water.

Diatoms recovery from wastewater: Overview from an ecological and economic perspective

“…Diatoms, the most productive phytoplankton found all over the planet from antarctic glaciers to brick walls, have drawn a tremendous awareness in the research field, i.e., for the quantitative reconstructions of ocean surface conditions to establish palaeoceanographic records [ 87 ]. They are one of the most promising candidates for various applications such as pharmaceuticals, bioenergy, industrial chemicals, nutraceuticals, and aquaculture [ 88 , 89 ]. To make most out of it, an axenic culture of diatom must be a prerequisite bearing in mind that a pure culture of diatoms is undoubtedly required in genome sequencing [ 90 ], to identify the producer of any novel bioactive compound for large scale manufacturing of nutraceutical [ 91 ], building a consortium for bioremediation [ 92 ] and to elucidate the relationship between other microalgae using omics tool [ 93 ].…”

Bioremediation of fishpond effluent and production of microalgae for an oyster farm in an innovative recirculating integrated multi-trophic aquaculture system

“…and the potential of the microalgae as food for other compartments, such as filter-feeders (Li et al, 2017). The use of Pacific oysters Crassostrea gigas, may be considered as a logical first choice as it is one of the main bivalve species farmed in Europe.…”

The Circular Economy Approach to Improving CNP Ratio in Inland Fishery Wastewater for Increasing Algal Biomass Production

“…The application of microalgal cultures as a sustainable process for the removal of nutrients has been studied on wastewater from Oreochromis niloticus [3,20,22,[24][25][26]38], Lates calcarifer [8], shrimp culture [29][30][31], Mugil cephalus [10,32], Sparus aurata [10,16], Scophthalmus maximus [39], and even synthetic wastewater [32,36]. According to the results, the percentage of NO 3 removed (>95%) is similar to that reported by most authors; however, the rate of PO 4 was lower than other authors since the wastewater was supplemented with external P.…”

“…[37], Synedra sp. [38], Tetraselmis sp. [13,18,23,33,34,39], algal-bacterial biofilm [40], and mixed consortia of algal strains [41] for the removal of nutrients from fishery wastewater has been tested at a laboratory (<50 L) and demonstration scale (>200 L) in countries such as Belgium [5,42], China [16], Colombia [43,44], Denmark [41], Spain [15,45], South Africa [22,46], and Poland [19].…”