This research studied that performances and mechanisms of phosphorus removal in three types of HSFCW: reed/gravel bed system (W1), multiple plants/gravel bed system (W2) and reed/multiple substrates bed system (W3). Spatial distribution and fractionation analysis of phosphorous in different substrates showed that the accumulated phosphorous in gravel, zeolite and steel slag were mainly in forms of Ca/Mg-P, residual-P and Fe/Al-P respectively. Biomass and phosphorus contained in plants harvested in early autumn was obviously higher than that contained in plants of late autumn, so the optimal harvest time should be late October. Among three systems, the phosphorus removal by adsorption and sedimentation of substrates accounted for 67%-76% of the total phosphorous removal and was the major channel for phosphorous removal. Removal by harvesting plants ranked second, accounting for 15%-21%. Other removal mechanisms accounted for about 10%. The research reveals that W3>W2>W1 in phosphorus removal efficiency in HSFCWs.
The adsorption behavior of Reactive Blue (RB2) dye from aqueous solution on chitosan/diatomite biocomposite adsorbent was studied. The effects of biocomposite adsorbent ratio and pH on removal of RB2 were examined, and optimum experimental conditions were identified. Biocomposite adsorbent had the largest adsorption efficiency when the ratio was 10 wt%. The maximum percentage removal of RB2 was 96.36% which obtained at pH 4.0. Adsorption equilibrium showed adsorption amount of RB2 improved with increase in the amount of NaCl, indicating that the addition of inorganic salt was an advantage of the removal of RB2.
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