Treatment Method of Slag in Incineration Plant

With the acceleration of urbanization, the problem of garbage has become an urgent problem to be solved. In order to solve this problem, Incineration plants came into being. However, Incineration plant will produce a large amount of slag while processing garbage. If these slag cannot be properly treated, it will bring great pollution to the environment. This article will introduce the treatment method of Incineration plant slag, in order to make contributions to environmental protection.

1、 Composition and hazards of slag

Slag refers to the unburned garbage residue in the process of Incineration, which is mainly composed of inorganic substances, such as iron oxide, aluminum oxide, Calcium oxide, etc. The amount of slag generated in the Incineration plant is related to the type of garbage, incineration temperature, incineration time and other factors. Generally, the amount of slag generated is about 20%~30% of the total amount of garbage.

The presence of slag can bring great harm to the environment, mainly manifested in the following aspects:

1. Soil contamination: The slag contains a lot of heavy metals, organic substances and other harmful substances, which will pollute the land if not properly treated.

2. Water pollution: Under rainfall conditions, harmful substances in slag can be washed into groundwater, thereby polluting the water body.

3. Air pollution: Harmful substances in slag can be dispersed with the wind, thereby polluting the air.

2、 Treatment method of slag

In order to avoid the harm of slag to the environment, we need to effectively treat the slag. The following will introduce several methods for treating slag.

1, landfill method

The landfill method refers to burying the slag underground to achieve the purpose of isolation. This method is relatively simple, but there are several issues:

1) The landfill site is limited and difficult to meet long-term treatment needs.

2) After the use of the landfill site, it requires long-term monitoring and maintenance, and the cost is high.

During the landfill process, harmful substances in the slag may leak into groundwater, causing water pollution.

2. Recycling method

The recycling method refers to the recycling and utilization of useful substances in slag. This method can effectively reduce the harm of slag to the environment and also achieve effective utilization of resources. The useful substances in slag mainly include iron, aluminum, calcium, etc., which can be recycled through methods such as magnetic separation and gravity separation.

3. Incineration method

The incineration method refers to the process of incinerating the slag again to reduce its volume. This method can effectively reduce the volume of slag, but there are also the following problems:

1) During the incineration process, harmful substances in the slag may be discharged into the air, resulting in air pollution.

2) During the incineration process, a large amount of energy is required and the cost is high.

3、 Conclusion

The treatment of slag in Incineration plant is an important environmental protection problem. In order to avoid the harm of slag to the environment, we need to effectively treat the slag. At present, landfill method, recycling method, and incineration method are common methods for slag treatment. Different processing methods have their own advantages and disadvantages, and they need to be selected based on the actual situation. We should actively explore new slag treatment methods and make greater contributions to environmental protection.