Abstract
The nutrient removal and biomass production of the internal circulating fluidized bed microalgae membrane bioreactor (ICFB-MMBR) was studied under different cultivation modes, influent TOC, influent pH, and influent N/P. Platymonas helgolandica tsingtaoensis was used as the biological source. The growth of P. helgolandica tsingtaoensis and the removal efficiency of pollutants in the mixotrophy culture mode were improved compared with other culture modes. With the increased influent TOC, the average growth rate of P. helgolandica tsingtaoensis increased, and ammonia nitrogen and total phosphorus removal rate were improved. The P. helgolandica tsingtaoensis growth rate and nutrient removal efficiencies at the influent pH of 8 were the best among the different influent pH values. As the influent N/P ratio increased from 5 to 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate increased gradually. When the influent N/P ratio was higher than 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate tended to be stable and did not significantly change with the increase of influent N/P ratio. At the proper influent conditions, the high P. helgolandica tsingtaoensis biomass and nutrient removal efficiency could be obtained in the microalgae membrane bioreactor, which could provide a theoretical basis for the application of the system for wastewater treatment.
Highlights
In recent years, the mariculture industry has tended towards an intensive, highdensity, and high-yield aquaculture model, which has led to the increasingly prominent problem of marine aquaculture environmental pollution [1,2,3]
In this study, Platymonas helgonica tsingtaoensis was used as an algae species to treat simulated mariculture wastewater by internal circulating fluidized bed microalgae membrane bioreactor
It has been reported that the combination of photoautotrophic and heterotrophic culture can effectively improve the biomass of microalgae [38,51,52]
Summary
The mariculture industry has tended towards an intensive, highdensity, and high-yield aquaculture model, which has led to the increasingly prominent problem of marine aquaculture environmental pollution [1,2,3]. How to design and optimize the process with good treatment efficiency has been a research hotspot in mariculture wastewater treatment [5,6,7]. Microalgae exhibited great versatility as energy sources, and many studies have suggested the combination of algal biomass production with wastewater treatment [8]. The treatment of mariculture wastewater by microalgae is an emerging and sustainable technology [9,10,11]. It could effectively accumulate microalgae biomass with the pollutants’
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