Comparative studies on removal of heavy metals from electroplating wastewater through soil aquifer treatment (SAT) in conjunction with adsorbents

Abstract

The study demonstrates the efficiency of the Soil Aquifer Treatment (SAT) towards removal of Heavy metals within Electroplating wastewater thereby rendering it suitable for ground water discharge. The unique proposition of this research is to use combination of soil and adsorbent properties to enhance the remediation of heavy metals such as Nickel, Copper and Zinc. A comparative study through statistical analysis is employed to illustrate the effectiveness of the various SAT systems build using various combinations of SM and SC soil types along with Bioadsorbents such as Eucalyptus Leaves, Sawdust and Mosambi peel. Further, the Mass balance analysis of heavy metals is carried out to comprehend the course of expulsion. The study through statistical approach endorses that the SAT in conjunction with adsorbent gives most extreme removal efficiency than the SAT without adsorbent. Additional removal efficiency of 14% to 30% can be achieved with introduction of adsorbents within the SAT system. The optimal removal efficiency of Nickel, Copper and Zinc was observed to be at 87, 98 and 93% respectively when passed through the combination of SM soil with sawdust.

Bioremoval of some heavy metals from aqueous solutions by two different indigenous fungi Aspergillus sp. AHM69 and Penicillium sp. AHM96 isolated from petroleum refining wastewater

“…The world population is increasing day by day. Thus, to meet the increasing demand of the population, clean water is the main concern ( Rekha and Lokeshappa, 2020 ). Under the prevailing conditions, wastewater reuse is an alternative to reduce misuse and encroachment on available natural water resources ( El-Gendy and El-Bondkly, 2016 ).…”

“…Heavy metals (HMs) as waste from different industries containing petroleum, leather, textile, pharmaceutical and others are the main pollutant existent in water are becoming one of the most serious environmental problems ( Burakov et al., 2018 ; Kumar et al., 2019 ). They are classified as non-biodegradable pollutants and pose a particular threat to human health because of their potentially toxic or carcinogenic effects, and their resistant, persistent and accumulation nature in terrestrial and aquatic organisms ( Pohl, 2020 ; Rekha and Lokeshappa, 2020 ). However, some of these heavy metals as iron and cobalt have functional roles that are necessary for different physiological and biochemical activities in the body, but in high doses they can be harmful to the body causing acute and chronic toxicity, neurotoxicity and generation of free radicals which stimulates oxidative stress that damage lipids, proteins and deoxyribonucleic acid (DNA) molecules ( Engwa et al., 2019 ).…”

Zinc recovery from hazardous construction wastes via an integrated process of the air classification, alkaline leaching, and water washing

“…This continues to increase at approximately 320,000 t/a; thus, posing a severe threat to the environment and humans (Wang et al., 2019). ZLHW originates from electric furnace ash (Ledesma et al., 2018), converter ash in steelworks (Araújo & Schalch, 2014), hot‐dip galvanized ash and Zn slag in electroplating plants (Rekha & Lokeshappa, 2020), Zn scum in the metallurgical industry (Krupnova et al., 2020), and waste electrodes in the battery industry, as well as the dust from industrial construction. ZLHW is listed in the national catalog of hazardous wastes; therefore, it cannot be arbitrarily discarded.…”