Advanced treatment method of thallium-containing wastewater

The invention discloses an advanced treatment method of thallium-containing wastewater. The advanced treatment method comprises the following steps: firstly, inputting sodium sulphide and ferric sulfide crystal seeds into thallium-containing wastewater in a grading manner to ensure that high-concentration heavy metals in the wastewater form sulfide precipitates; initially reducing the concentration of the heavy metals in the wastewater; inputting a certain quantity of high-grade oxidizing agents into the wastewater subjected to sulfide precipitation for oxidizing thallium in the wastewater to change a form of thallium in the wastewater; conveying the wastewater subjected to high-grade oxidization to an adsorption tower in which a nano-hydrated manganese oxide adsorbent is contained for further advanced removal on a trace quantity of heavy metals remaining in the wastewater through the high adsorption capability of the nano-hydrated manganese oxide adsorbent. According to the treatment method, the thallium removal efficiency and the treatment efficiency of back-end advanced adsorption treatment are improved, the post-treatment reusing of the thallium-containing wastewater is facilitated, and the method has an important meaning on drainage reduction of the total quantity of the heavy pollutants in the areas where environment capacity of the heavy metals is low.