Diatom algae are known to play an important role as primary producers in many diverse ecosystems including artificial aquaculture ponds were 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 micro nutrients, 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 9 different treatments of which addition of micronutrient mixture Nualgi along with adjusted N:P to 6:1 has resulted in highest cell density followed by Silicate enrichment were as only N:P adjustment and Nualgi addition has no significant effect on diatom growth. At the end of growth experiment, the N removal efficiency of treatment groups (50.23%–65.44%) were significantly higher (P < 0.05) than control group (43.56%) were as 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 control group at 63.87%, than other experimental groups. These results will give us a new insight in to important factors influencing beneficial algae growth and simultaneous nutrient removal from aquaculture waste water.
- diatom (Synedra)
- N: P ratio
- nutrient removal
- First received 9 October 2016.
- Accepted in revised form 28 February 2017.
- © IWA Publishing 2017