Investigation Of Organic Arsenic-bearing Wastewaters Remediation By Utilizing The Spent Aluminum Metals

The inorganic arsenic are widely distributed in many natural aquatic environments and a variety of relevant industrial effluents.Due to their hypertoxicity,carcinogenicity,organic arsenic are stipulated as priority pollutants.Phenylarsonic acid compounds,have been used as animal feed additives to promote growth and suppress bacterial.The majority of these compounds ingested do not get metabolized and chemically unchanged in the animal bodies,are excreted via urine and feces,which can subsequently release the more toxic inorganic arsenic species upon degradation in the environment.Eventually,their occurrence in natural environment may have detrimental impacts on the human’s health and ecosystem.Hence disposal of waste containing organic arsenic pollutants becomes a well-recognized environmental issue of the modern world and till now,many traditional and advanced approaches have been applied for the remediation.In spite of this,these approaches still need to be upgraded for more cost-effective and environmental compatibility.In addition,further studies are still required to inspect the reaction mechanisms of many remediation technologies.In regard to these problems,this study the p-ASA was selected the target pollutants and investigated the reaction mechanism occurring in ZVAl/H⁺reaction system.Through SEM,XRD,ICP and other techniques to analyze the composition of the AlBCs.Studyed the degradation of p-ASA in AlBCs/H⁺and AlBCs/Fe（II）system.And the effects of substrate concentration,pH,the oxide layer of the AlBCs,radical scavenger,gas atmosphere conditions and the water quality on p-ASA oxidation were evaluated.The experimental results demonstrate that highly oxiditive species,^·OH,were produced in ZVAl/H⁺reaction system and can degrade p-ASA.The oxidative degradation process is affected by the solution pH,gas atmosphere and other reaction condition.Oxygen is the key to produce active substances in the system,and Fe（II）can effectively improve the degradation rate.Research shows that the zero valent aluminum has great potential in the field of organic arsenic pollutant degradation.In the AlBCs/Fe（II）system,Fe（II）did not only catalytically transform H₂O₂ to^·OH via Fenton reaction,but also,combining with Al（III）ion,acts as preferable flocculant for toxic inorganic arsenic removal.In addition,compared with other advanced oxidation technology in energy efficiency and the removal rate of TOC,the present study provides a cost-effective and environmentally friendly strategy for degrading organic arsenic pollutants and immobilizing the hypertoxic inorganic arsenic species.