Method for deeply removing thallium from high-ammonia-nitrogen and high-COD wastewater

The invention discloses a method for deeply removing thallium from high-ammonia-nitrogen and high-COD wastewater. The method comprises the following steps: S1, regulating the pH value of the wastewater by using lime milk or sulfuric acid, adding potassium ferrate to react, adding a flocculant, and standing the system; S2, taking the obtained supernatant after standing, adding sodium cobalt nitriteand sodium sulfide to react, then adding lime milk to regulate the wastewater, adding the flocculant, performing flocculating precipitation for 30 min; and S3, carrying out liquid-solid separation, recovering valuable metals from a first-section slag rotary kiln and a second-section slag rotary kiln, feeding the obtained treated liquid into a clear water tank, and discharging the treated liquid.The method has a scientific and reasonable structure, is safe and convenient to use, can treat conventional wastewater, is more suitable for treating high-ammonia-nitrogen and high-COD wastewater containing thallium, makes the