Assessment of the performance of intermittent planted filters in treating urban wastewater under arid climate

The present study demonstrates the feasibility of a constructed wetland (CW) planted with Phragmites australis to treat the heavy metals (HMs) from wastewater. Wastewater samples were collected from the in-let, out-let of the CW and analyzed for HMs such as Cadmium (Cd), Zinc (Zn), Lead (Pb), and Copper (Cu) using standard methods. Similarly, samples of Phragmites australis and sediments were also analyzed for selected HMs. Results indicate that the removal efficiencies of the planted CWs for Cd, Zn, Cu and Pb were 89.34, 76.27, 68.14, and 66.42%, respectively. On the other hand, the removal efficiency of the unplanted system was significantly lower, ranging between 18.27 and 33.16%. The plant played a strategic role in the absorption and accumulation of pollutants, the greatest mean concentrations of HMs were found in the below-ground plant parts of P. australis. While, the survey revealed that the amount of HMs accumulated in the aerial horizon represents often an only small adsorbed fraction, but higher than the concentrations measured at the underground horizon of the soil. The biological accumulation factor confirms the previous observations, that the roots and the rhizomes are the most bio-accumulator of all analyzed elements and, the results of the transfer factor values were estimating the ability of P. australis to transfer HMs from roots to sheets, which varied between 0.97 and 1.61 by the following order: Cd > Pb > Zn > Cu.

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The Environmental Hazards and Treatment of Ship’s Domestic Sewage

Zhang,

Xian,

Sun

et al. 2024

Toxics

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With the rapid development of the modern shipping field, the damage caused by ship pollution to the global inland waterways and marine ecosystems has attracted extensive attention from the international community. However, there are fewer reviews on the environmental hazards of domestic ship sewage and its treatment, and a systematic summary of the environmental hazards posed by ship domestic sewage and its treatment is lacking. Based on summarizing the various environmental hazards brought about by a ship’s domestic sewage and the corresponding treatment methods, this study elaborates, in detail, on the specific hazards of the main toxic and hazardous substances contained in a ship’s domestic sewage on the environment and organisms, and the treatment methods of the ship’s domestic sewage and their treatment effects, such as membrane bioreactor (MBR). It is also pointed out that MBR has great potential in the direction of ship domestic sewage treatment, and the solution of its membrane pollution and other problems as well as the exploration of the combination of MBR and other treatment methods will become the focus of future research. A theoretical reference is provided for the study of environmental problems caused by domestic sewage from ships and their treatment options.

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Assessment of the performance of intermittent planted filters in treating urban wastewater under arid climate

Cited by 3 publications

References 29 publications

Treatment of urban wastewater by coupling planted filters with anodic oxidation process

Treatment of urban wastewater by coupling planted filters with anodic oxidation process

Potential of Phragmites australis in Vertical Flow Constructed Wetland for Heavy metals removal from Urban wastewater

The Environmental Hazards and Treatment of Ship’s Domestic Sewage

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