Effects of Chlorella vulgaris on phosphorus release from ferric phosphate sediment by consecutive cultivations

Abstract

Iron phosphate (Fe–P) is a main phosphorus storage form, especially in phosphorus-polluted environments. The re-release of Fe–P is a problematic result during microalgal remediation. In this study, pre-incubated Chlorella vulgaris was cultured in a BG-11 culture medium with different amounts of Fe–P. The effects of Fe–P re-release on biomass, flocculation and removal of PO 4 3− were investigated. The results indicated that C. vulgaris can promote the dissolution and release of Fe–P when the pH is 7, and the amount of Fe–P (ΔQ) released in 200 ml water reaches 0.055–0.45 mg d −1 under a C. vulgaris concentration of 5.6 × 10 5 –8 × 10 5 cells ml −1 . The growth of C. vulgaris was inhibited because of the flocculation behaviour of Fe 3 + in the release stage, which is associated with a specific growth rate of 0.3–0.4 d −1 and a phosphorus removal rate below 30%. However, this process, in the long term, indicates a favourable transformation in which Fe–P becomes bioavailable under the action of C. vulgaris . Microalgae outbreaks may be triggered by persistent interactions between Fe–P and C. vulgaris . This study provides an important reference for the application of C. vulgaris in a Fe–P-rich environment.

Self-Assembly of Nanoporous ZIF-8-Based Superstructures for Robust Chemical Sensing of Solvent Vapors

“…Fabry−Peŕot (F−P) optical sensors have been widely investigated for their fast response time, which is typically accomplished by detecting photonic band shifts caused by changes in the chemical composition of the environment. 6 According to Bragg's law, the photonic band of an F−P sensor can be tuned by changing the effective refractive index and the spacing between the interference films. 7 In the past few years, opal structure, 8 inverse opal structure, 9 or gel film structure 10 made of functional materials have been used to construct periodic structures with fascinating optical properties.…”

“…They are widely used in the fields of photonic and chemical sensing, , display technology, and solar cells due to their variable photonic band gap. Fabry–Pérot (F–P) optical sensors have been widely investigated for their fast response time, which is typically accomplished by detecting photonic band shifts caused by changes in the chemical composition of the environment . According to Bragg’s law, the photonic band of an F–P sensor can be tuned by changing the effective refractive index and the spacing between the interference films .…”