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  • What are heavy metals in industrial wastewater?
  • Heavy metals are the metallic elements which density are more than 5 g/cm 3, and lead, cadmium, chromium, mercury and copper are the most common toxic heavy metals in industrial wastewater ( Ghosh et al., 2021; Nigam et al., 2021 ).
  • How effective is biological treatment of heavy metals in industrial wastewater?
  • In addition, microbial activity was easily inhibited in industrial wastewater due to low nutrition and high toxicity, and thus biological treatment efficiency of heavy metals was very limited ( Long et al., 2020; Verma and Jaiswal, 2016 ). In China, biological treatment was also rarely used to treat HMW. Fig. 9.
  • What is the emission control plan for heavy metals?
  • This plan focused on emission control of five kinds of heavy metals including Pb, Hg, Cd, Cr (VI), T-Cr, thus their emission was reduced to 52.9, 0.6, 11.2, 15.5, 52.9 t in 2016, respectively.