First, the purpose of the experiment.
The purpose of this experiment is to improve the treatment method of tailings sewage, and to compare and evaluate different treatment methods by simulating the water quality characteristics of tailings sewage in the laboratory, so as to find an effective tailings sewage treatment scheme and provide theoretical basis and practical guidance for practical engineering.
Second, the principle of experiment.
The main components of tailings sewage are heavy metal ions and suspended solids, and its treatment methods mainly include physical, chemical and biological methods. In this experiment, chemical precipitation method and bioadsorption method were used to treat tailings wastewater, and the heavy metal ions were formed into precipitates by adjusting the pH value, and the remaining pollutants were adsorbed by bioadsorbents.
3. Experimental procedures.
1.Prepare experimental materials: prepare experimental equipment and reagents such as tailings sewage, chemical precipitants, bioadsorbents, pH test papers, graduated cylinders, beakers, etc.
2.Sampling and pretreatment: Collect a certain amount of tailings sewage for pretreatment, including removing large suspended solids and adjusting water quality concentration.
3.Experimental grouping: The pretreated wastewater was divided into several groups and treated by different treatment methods to compare the treatment effects.
4.Treatment: Chemical precipitation method and bioadsorption method were used to treat each group of wastewater. In chemical precipitation, the pH value is adjusted so that heavy metal ions form precipitates;In the bioadsorption method, bioadsorbents are used to adsorb the remaining pollutants.
5.Detection and recording: Before and after treatment, the water quality indicators of each group of sewage were detected, including heavy metal ion concentration, suspended solids content, COD, etc., and experimental data were recorded.
6.Result analysis: According to the experimental data, the advantages and disadvantages of various treatment methods were analyzed, and the optimal treatment scheme was obtained.
7.Experiment summary: summarize the experimental process, put forward suggestions and suggestions for improvement, and provide reference for actual engineering.
Fourth, experimental results and analysis.
1.Comparison of heavy metal ion concentrations.
After the chemical precipitation treatment, the concentration of heavy metal ions in each group of sewage decreased, and the concentration of heavy metal ions in the first and second groups decreased greatly, and the treatment effect was better. The removal effect of bioadsorption on heavy metal ions is relatively weak.
2.Comparison of suspended solids content.
The chemical precipitation method can effectively remove the suspended solids in the tailings wastewater, and the content of suspended solids in the first and second groups of sewage treated is significantly reduced. The effect of bioadsorption on the removal of suspended solids was not obvious.
3.Comparison of COD removal effects.
The chemical precipitation method has no obvious effect on the removal of COD, while the bioadsorption method can effectively reduce the COD value. This shows that bioadsorption has advantages in removing organic matter.
Comparing the experimental data of each group, it can be concluded that the chemical precipitation method has a good effect in the treatment of heavy metal ions and suspended solids in tailings wastewater, while the bioadsorption method has excellent performance in removing organic matter. Therefore, in the actual project, the combination of chemical precipitation method and biological adsorption method can be used to treat tailings wastewater.
V. Conclusions and Recommendations.
In this experiment, the application effect of chemical precipitation method and bioadsorption method in tailings sewage treatment was determined through the laboratory simulation treatment of tailings wastewater. The experimental results show that the chemical precipitation method can effectively remove heavy metal ions and suspended solids, while the bioadsorption method has advantages in removing organic matter. Therefore, in the actual project, two methods can be combined for tailings sewage treatment to improve the treatment effect. It is suggested that the process parameters of chemical precipitation and bioadsorption should be further optimized, and the feasibility of other new tailings sewage treatment technologies should be studied in depth, so as to provide more options for practical projects. At the same time, the comprehensive utilization of tailings sewage should be strengthened to achieve the dual goals of effective utilization of resources and environmental protection.