Hydro-electric Engineering

Highlights • Systematic investigation of the electron-transfer mechanism of a biocathode. • Discussion of the key factors influencing heavy metal removal by a biocathode. • Summary of the microbial community structure on a biocathode. 1. Introduction Heavy metal pollution is a severe water problem globally (Nan et al., 2013). Untreated heavy metal effluents can cause serious water and soil pollution in surrounding areas, resulting in potentially significant harm to humans (Kapahi and Sachdeva, 2019).

Abstract Light absorption by the water column plays an important role in the spatial and temporal distribution of light attenuation, mixed layer heating, primary productivity, and phytoplankton biomass in the water column. The absorption properties of water components are the main influences of the underwater light field and surface spectrum.