What are the utilization methods of municipal sewage sludge pyrolysis residue?

 There are many ways to utilize the pyrolysis residue of municipal sludge, which are aimed at realizing the resource utilization of the residue while avoiding secondary pollution to the environment. The following are some of the main utilization methods:

 1. As a raw material for building materials

Preparation of ceramsite: The pyrolysis residue of municipal sludge can be used as a raw material for preparing ceramsite due to its excellent structural characteristics. Sludge ceramsite used as a building material has the characteristics of high permeability, heat resistance, high porosity, high specific surface area, high strength and chemical resistance. This utilization method can not only reduce the disposal cost, but also avoid the secondary pollution caused by residue composting and landfilling.

Production of clay bricks: Under certain conditions (such as 850℃ and mass fraction of 15%), municipal sludge can be used to produce clay bricks. The cost of this clay brick is relatively low, which greatly saves resources and produces good economic benefits.

 2. As a soil conditioner or fertilizer

Improving soil: Some components in sludge residue can be used as soil conditioners to effectively reduce the thermal shrinkage of soil and improve soil quality.

Making carbon-based fertilizer: After further processing, the residue can be used as a raw material for carbon-based fertilizer, made into forestry fertilizer or soil conditioner, and realize efficient utilization of resources.

 3. As an adhesive or flocculant

Adhesive: Sludge itself contains organic matter, such as protein, etc., which has certain heat and binding properties. Therefore, sludge residue can be used as an adhesive to improve the shear strength and compressibility of soil or materials.

 Flocculant: Sludge residue that has undergone specific treatment can also be used as a flocculant, playing an important role in water treatment and other fields.

 4. As an adsorbent or catalyst carrier

 Adsorbent: Through activation treatment, sludge residue can be prepared into an adsorbent with good performance, which is used in wastewater treatment, air purification and other fields.

Catalyst carrier: Some components in the residue can also be used as catalyst carriers, playing an important role in the chemical industry.

 5. Other utilization methods

 Producing biofuels: Although pyrolysis residue itself is not directly used as biofuel, the pyrolysis oil and pyrolysis gas produced during pyrolysis can be used directly instead of fuel.

Recycling of valuable metals: If the sludge residue contains valuable metal elements (such as iron, non-ferrous metals, etc.), it can be recycled through specific technologies to achieve the recycling of resources.

It should be noted that when using the pyrolysis residue of urban sludge, its impact on the environment and safety should be fully considered. For example, during the treatment process, it is necessary to ensure the stabilization and harmlessness of harmful substances such as heavy metals; when used as building materials, strict quality control and performance testing should be carried out; when used as a soil conditioner or fertilizer, its long-term impact on soil and crops should be fully considered.

In summary, the pyrolysis residue of urban sludge has a variety of utilization methods and huge potential resource value. Through scientific and reasonable treatment and utilization methods, not only can the recycling of resources and sustainable economic development be achieved, but also the pollution and damage to the environment can be reduced. If you have any needs for pyrolysis equipment, please feel free to contact Zhengzhou Dingli New Energy Equipment Co., Ltd. The company will arrange professional engineers and sales managers to give you a detailed reply!