Treatment method and treatment device for low-concentration heavy metal wastewater and application

The invention discloses a low-concentration heavy metal wastewater treatment method, a treatment device and application. The treatment method comprises the following steps: forming a self-electrolysis reaction system by the low-concentration heavy metal wastewater, elemental iron and a carbon material, and carrying out self-electrolysis reaction; an electrode is arranged in the self-electrolysis reaction system to apply pulse current, and an additional electrolysis reaction is synchronously carried out, so that heavy metal ions in the low-concentration heavy metal wastewater are removed. The technical scheme provided by the invention is specially designed aiming at the low-concentration heavy metal wastewater, and through the mutual synergistic effect of the spontaneous electrolysis reaction generated by a primary battery system composed of the wastewater, the iron elementary substance and the carbon material and the external electrolysis reaction caused by the pulse current applied by the outside, the heavy