Letter to the Editor: Comments on 'Removal of aluminium by constructed wetlands with water hyacinth (Eichhornia crassipes (Mart.) Solms) grown under different nutritional conditions'

摘要

Jayaweera et al. studied the phytoremediation of Al-rich industrial wastewater using water hyacinths. Control of Al releases into the environment is an important topic, as this metal has a potential for bioavailability and toxi-city to aquatic life; however, both are governed by the Al speciation. Al can be found in a variety of forms, as acknowledged by Jayaweera et al. Yet, no mention is made to the type of industrial wastewater that was being tested. Although there is reference to a previous groundwater quality survey in which the Al levels were of 5.62 mg/L, this concentration of Al was added in the form of aluminium sulfate to "fresh water" (assumed to be a surface water given the nature of the study) to produce the synthetic industrial wastewater used in their study. The aluminium sulfate was used in a concentration that is fairly close to typical dosages used in treatment processes for the removal of suspended solids, organic matter, and phosphorus (one of the nutrients used in the experiment).