The invention discloses a treatment method of
arsenic wastewater. The treatment method comprises the following steps: optionally adding acid liquor into the
arsenic wastewater to adjust the pH value to 0-5; introducing the
arsenic wastewater into a reaction unit, continuously removing arsenic by adding
sulfide in multistage manner; carrying out
solid-liquid separation on the
effluent after reaction, recycling the separated arsenic
slag; adding alkali into the separated
effluent to perform electrochemical advanced treatment, wherein the electrochemical advanced treatment includes an electrolytic coagulation step, an electrolytic flotation step and an electrolytic
oxidation reduction step, in the electrolytic coagulation, cations are generated by the electrolyzation of a soluble anodic iron plate for
flocculation; carrying out aerated oxidation on the
effluent after
flocculation to generate floc and
micelle sediment including
ferric ions, and then carrying out
solid-liquid separation, wherein the liquid supernatant after separation can be recycled or reach the standard and drain outwards. The treatment method of arsenic wastewater has the advantages of simple technology, low investment, low cost and high
resource recovery and recycling rate, and being green and environment-friendly, and being capable of treating continuously and the like.