Evaluation of partial nitrification efficiency as a response to cadmium concentration and microplastic polyvinylchloride abundance during landfill leachate treatment

• Published in: Chemosphere (Oxford) 2020-05, Vol.247, p.125903-125903, Article 125903
• Main Authors: Li, Lu, Li, Zhouyang, Liu, Dan, Song, Kang
• Format: Article
• Language: English
• Subjects: Ammonia; Bioreactors; Cadmium; Heavy metal; Kinetics; Landfill leachate; Microplastics; Microplastics - toxicity; Nitrification - drug effects; Nitrogen; Oxidation-Reduction; Partial nitrification; Plastics; Polyvinyl Chloride - toxicity; Waste Disposal, Fluid; Water Pollutants, Chemical - toxicity
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2020.125903

The partial nitrification efficiency response to the presence of cadmium (Cd2+) and microplastics was investigated. Microplastics polyvinylchloride (PVC) abundance was 0–10,000 particles/L, and Cd2+ concentration was 0–10 mg/L. Cd-only inhibited the NH4+-N oxidation rate 1.21, 1.23, and 1.18 times with concentrations at 1, 5, and 10 mg/L, respectively. PVC-only inhibited NH4+-N oxidation rate 1.01, 1.21 and 1.05 times with PVC abundance at 1000, 5000 and 10,000 particles/L, respectively. The ammonia oxidation rate was improved with the co-existence of PVC and Cd2+ at the conditions PVC1000 and PVC5000, which could be attributed to the PVC. PVC at 1000 particles/L could act as carrier and mitigate the negative effect of Cd2+ to the partial nitrification process. Moreover, the partial nitrification process was largely inhibited with PVC abundance at 10,000 particles/L. First-order kinetic models could simulate the NH4+-N, NO2−N, and NO3−-N changes in the partial nitrification process. [Display omitted] •PVC-Cd co-effect to partial nitrification process was investigated.•PVC10000-Cd has highest inhibition to partial nitrification efficiency.•PVC1000-Cd has improved the partial nitrification efficiency.