For the first time, an industrial solid waste (CAS) was used for the rapid oxidation and neutralization of acidic sulfate soil. The waste mainly contained Fe-doped CaCO3 and CaAl-layered double hydroxide (LDH). After treatment, CAS neutralized the acidic soil with the aid of hydrogen peroxide. Compared with other oxidation-accelerating materials, including activated carbon, biochar, and Fe-doped biochar, CAS showed the best oxidation rate acceleration. When the ratio of CAS and sulfur in acidic soil was 1.5:1, the pH of the soil changed to 6.32 and the oxidation rate increased by 50%. The characterization results showed that the main products of CAS were CaMg oxides and Ca-Al LDH. The oxidation product (SO42−) was intercalated into the LDH interlayers. The accelerated oxidation mechanism of CAS was divided into the following stages: accelerated Fenton oxidation; LDH adsorption of oxidized SO42−; and neutralization of sulfuric acid by calcium carbonate. The main results of this work provide a high-value-added utilization method of solid waste for acidic soil remediation.
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