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1. Sludge is sorted by source
Sludge is a solid precipitate produced by water and wastewater treatment.
As the nature of various types of sludge changes, classification is very necessary, its treatment and disposal is not the same. According to its source, it can be divided into:
- Municipal sludge (also known as sludge sludge sludge sludge), mainly from the sewage sludge, which is the largest number of sludge. In addition, the WWTP sludge is also available from municipal facilities and can be classified in this category.
- pipe sludge, sludge from the drainage collection system.
- rivers and lakes silt, from rivers, lakes of silt.
- industrial sludge, from a variety of industrial production of solid and water, oil, chemical pollution, organic matter mixture.
In non-specific environment, the sludge generally refers to municipal sewage sludge.

2. How does sludge come from waste water?
Wastewater treatment is composed of a series of physical and chemical and biological treatment process:
Precipitation (with or without the use of chemical flocculants), filtration, filtration
The aerobic and anaerobic treatment is carried out by microorganisms to produce organic complexes
Biochemical denitrification and dephosphorization
Digestion and biogas production
In the process of wastewater purification, the pollutants in the wastewater are concentrated by biochemical degradation. Biological treatment can degrade most of the organic pollutants into water and gas (aerobic treatment produces CO2, O2, anaerobic treatment produces CH4-based gases), metal contaminants (including heavy metals) can not be processed and concentrated in the sludge The
Sludge is produced by the sewage at all levels of solid matter, sewage treatment plant is an inevitable by-product.

3. Sludge according to how the sewage treatment process is classified
Sewage treatment plant sludge according to the different processing level, can be divided into the following:
Primary Sludge (Primary): only after physical and chemical treatment
Secondary sludge: biological treatment of sludge
Tertiary: dephosphorization / denitrification of sludge
According to the nature of the sludge, it can be divided into:
Undigested sludge
Digested sludge
Sludge digestion and aerobic and anaerobic points.
The physical and chemical properties of sludge at different levels are different, and the nature of digested and unprocessed sludge is even worse. Many back-end processes must understand the nature of the front-end sludge to determine their handling.

4. What is sludge drying?
The sludge produced by the sewage treatment has a high water content. Due to the characteristics of the combination of moisture and sludge particles, the mechanical method has some limitations. The organic matter content in the sludge, the proportion of ash, especially the addition of the accumulator The amount of material has an important effect on the final solid content. In general, the use of mechanical dehydration can be 20% -30% of the solid, the formation of sludge is also known as mud cake. The moisture content of the cake is still high, with fluid properties, its disposal difficulty and cost are still high, so it is necessary to further reduce the amount. At this time, in addition to natural dry, only by the formation of heat evaporation, in order to achieve large-scale reduction. Heat treatment is done by heat drying.

5. What are the economic parameters of sludge drying concerns?
Sludge drying is the process of evaporation of water. In order to carry out research on the drying project to determine the size of the reduction process, it is necessary to understand some of the economic parameters of the sludge project, including:
Wetting of wet mud after mechanical solidification
The purpose of the final disposal, type

What is the operating flow of the belt vacuum filter?
Sludge technology scheme, filter press equipment