Iron and steel is often referred to as a ferrous metal, and is divided into raw (cast) iron, wrought iron and steel. Due to the different production processes, the wastewater and the nature are also different, from the first division, there are ironmaking workshop wastewater, steelmaking workshop wastewater and rolling workshop wastewater. From the perspective of use, there are two main categories: indirect cooling wastewater and washing wastewater. The chemical composition of pollutants in iron and steel wastewater is suspended solids, oil and grease, heavy metal ions, organic toluene, organic phenol, organic naphthalene, acid and alkali, etc. The former has a high concentration in the production process and is difficult to treat, but the amount of water is smallThe concentration of cleaning wastewater is low, the composition of wastewater is more complex, and the difficulty of treatment is low.
1. High concentration and high processing difficulty.
2. The composition is complex.
3. Refractory to degradation and toxic.
The heavy metals in the wastewater of the steel mill are generally mainly degraded by the biochemical tank in the water treatment process section, and the corresponding heavy metal reaction equipment will be added before the process, and the heavy metal remover will also be added at the back end to chelate the heavy metal substances in the wastewater and make it precipitate.
The heavy metal scavenger in the sewage of the iron and steel plant can remove the heavy metal copper ions well, but the dosage is slightly larger, and it cannot be added for a long time, and it can be treated in a short period of time, and its reaction time is fast, and it can be effectively removed within a few minutes. It is recommended to adjust the equipment process in the process of short-term treatment, which can reduce the amount of chemicals and reduce the cost. Heavy metal scavengers. After the precipitation is generated by the combination of heavy metal scavenger and heavy metal, it is easy to remove heavy metals through simple physical precipitation, and the complex precipitation formed can stably exist in the natural environment without causing secondary pollution.