Experimental study on the treatment of acid mine drainage containing heavy metals with domestic waste pyrolysis ash

Abstract

Acid mine drainage (AMD) is a special kind of acidic wastewater produced in the process of mining and utilization. In this study, AMD was treated using the adsorption method. Domestic waste was prepared by pyrolysis, and the resulting waste pyrolysis ash adsorbent was studied experimentally by a static adsorption test to treat metal ions in AMD. The results showed that the maximum adsorption amounts of Zn2+, Cu2+, Mn2+, Fe2+, Pb2+, and Cd2+ reached 0.425, 0.593, 0.498, 18.519, 0.055, and 0.039 mg/g, respectively, when the amount of pyrolysis ash was added at 30 g/L, the initial pH of the water was 4.1 and the reaction time was 150 min. It was found that, the waste pyrolysis ash could be reused at least 3 times by using Na2S as the regeneration agent. The SEM and BET characterization results prove that its large specific surface areas and well-developed pore structures have the potential to promote the adsorption of metal ions. The pseudo-second-order kinetic equation and Freundlich adsorption isotherms fit the adsorption process well, and the experiments reveal that the metal ions in AMD are well treated by waste pyrolysis ash through adsorption, flocculation and chemical precipitation. Waste pyrolysis ash has great potential for the treatment of acid mine drainage, providing a new approach to solid waste disposal and new ideas for water treatment as a low-cost alternative material.

Use of a Waste-Derived Linde Type-A Immobilized in Agarose for the Remediation of Water Impacted by Coal Acid Mine Drainage at Pilot Scale

“…The estimated maximum sorption capacity achieved at saturation time (t s ≈ 2880 min) was 1.38 mg Mn 2+ /g LTA. Similar values to this work are found in the literature (Table 3), e.g., 0.498 mg of Mn 2+ per gram of ashes from domestic waste [49] and 0.076 mg and 0.52 mg of Mn 2+ per gram of two different natural zeolites [51,52].…”

“…The literature reports results for iron ion removal with alternative adsorbents comparable to this study (Table 3). For instance, Núñez-Gómez et al [2] reported an adsorption capacity in continuous flow of 17.43 mg of iron ions per g of shrimp shell, and the study by Li et al [49] found a maximum removal of 18.519 mg of Fe 2+ per gram of ashes from domestic waste. The Mn 2+ ion breakthrough curve (Figure 5b) behaved similarly to that observed for Fe 2+ ion.…”

Treatment of fluorinated wastewater with chitosan modified activated sludge lysis ash

“…14,15 But the process will inevitably produce large amounts of ash, which will create new disposal problems. 16 The large quantities of sludge generated as waste from treatment plants and the residues from their subsequent lysis process remain environmental issues. In recent research, Ahmed used low-value lignocellulosic materials to synthesize activated carbon into value-added products offers new ideas for a circular economy.…”

Modification of Calcium Oxide from Green Mussel Shell with Iron Oxide as a Potential Adsorbent for the Removal of Iron and Manganese Ions from Acid Mine Drainage

“…Furthermore, AMD causes the loss of biodiversity and aquatic ecosystems [Kefeni et al, 2017]. The characteristics of AMD, such as low pH, high of salinity, suspended solids, and concentrations of heavy metals [Tong et al, 2022;Li et al, 2022]. Previous studies stated that AMD contains heavy metals, such as Fe, Mn, Zn, Pb, Hg, Al, Cu, and Cd [Westholm et al, 2014;Nunez-gomez et al, 2019].…”

“…The active treatment has the advantages of low cost, flexibility, simple design, and easy operation [Ahmaruzzaman, 2011;Markovic et al, 2020]. Some adsorbents such as lignite [Mohan and Chander, 2006], zeolite [Motsi et al, 2011], bone char [Sicupira et al, 2015], activated carbon [Aprianti et al, 2017], carbon nanotube [Rodriguez and Leiva, 2020], organic biomixture [Raiman et al, 2021], and, waste pyrolysis ash [Li et al, 2022], showed promising results to reduce heavy metal ions from AMD.…”