Abstract
The high-strength wastewater is now well known as a threat to the natural water since it is highly possible to arouse water eutrophication or algal blooms. The effects of various light emitting diode wavelengths and intensities on the microalgae biological wastewater treatment system was studied in this research. The various nutrient removals and economic efficiencies represented similar variation trends, and these variations under both high C and N loading treatments were similar too. The order for microalgae C. vulgaris reproduction in terms of dry weight and nutrient removal efficiency both were red > white > yellow > blue, under high carbon and nitrogen loading treatments, indicating that the red light was the optimum light wavelength. Furthermore, considering the optimal light intensity in terms of nutrient removal efficiency was 2500 and 2000 μmol/m2•s, while in terms of economic efficiency was 1000, 1500 and 2000 μmol/m2•s. Therefore, the optimum light intensity was found to be 2000 μmol/m2•s. In addition, the optimal experimental illumination time was determined as 120 h. The Chlorella vulgaris microalgae biological wastewater treatment system utilized in this research was able to purify the high-strength carbon and nitrogen wastewater effectively under optimum light wavelength and intensity.
Highlights
The high-strength wastewater has attracted increasing interests over the past decades owing to its significant effects on water bodies [1]
The fermentation slurry is rich in carbon (C), nitrogen (N), phosphorus, and other nutrients and highly possible to cause water eutrophication and algal blooms [2,3]
The existing centralized wastewater treatment systems based on the packed-bed biofilm reactors or up-flow anaerobic sludge blanket reactors are not
Summary
The high-strength wastewater has attracted increasing interests over the past decades owing to its significant effects on water bodies [1]. The fermentation slurry is rich in carbon (C), nitrogen (N), phosphorus, and other nutrients and highly possible to cause water eutrophication and algal blooms [2,3]. Another kind of typical highstrength wastewater is chemical fertilizer agricultural wastewater which has been reported as one of the principal sources of non-point source pollution [4,5]. There is an urgent need to develop a bio-system to effectively treat highstrength wastewater. The existing centralized wastewater treatment systems based on the packed-bed biofilm reactors or up-flow anaerobic sludge blanket reactors are not
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