The technical and economic indicators of using drum screen screening process in household waste treatment engineering are screening efficiency and productivity. The former is a quality indicator, while the latter is a quantity indicator. There is a certain relationship between them, and they are also related to many other factors that determine the screening results. The factors that affect the screening process can generally be divided into three categories:

1、 The impact of production conditions

When the load on the sieve is high, the screening efficiency is low. The flatness of the sieve largely depends on the size of the sieve holes and the overall screening efficiency; The larger the sieve aperture and the lower the screening efficiency required, the higher the productivity. The uniformity of feeding is of great significance to the screening process. The inclination angle of the sieve should be appropriate, usually determined through experiments. Another factor is the amplitude and vibration frequency of the sieve, which is related to the structural properties of the sieve. Within a certain range of household waste treatment projects, increasing vibration can improve the screening index.

2、 The influence of screening surface properties and structural parameters

The vibrating screen causes particles to move vertically with the screen surface, resulting in high screening efficiency and high production capacity. The relative motion between particles and the screen surface is mainly parallel motion in bar screens, flat vibrating screens, cylindrical screens, etc., which have low screening efficiency and production capacity. For certain materials, the productivity and screening efficiency of the sieve in household waste treatment projects are determined by the size of the sieve holes. The productivity depends on the width of the screen surface, and a wide screen surface results in high productivity. The screening efficiency depends on the length of the screen surface, and a longer screen surface results in higher screening efficiency. The general aspect ratio is 2. The larger the effective sieve area (i.e. the ratio of the sieve hole area to the entire sieve surface area), the higher the unit area productivity and screening efficiency of the sieve surface. The larger the sieve size, the higher the productivity per unit sieve surface and the higher the screening efficiency.

3、 Physical properties of screened materials

Including the particle size composition, humidity, mud content, and particle shape of the material itself. When the content of fine particles in the material is high, the productivity of the sieve is also high. When the humidity of the material is high, the screening efficiency generally decreases. But the larger the sieve size, the smaller the impact of moisture. Therefore, for wet materials with high moisture content, in order to improve the screening process, it is generally possible to increase the sieve size or use wet screening. When the mud content of the material is high (when the mud content is greater than 8%), wet screening or pre washing should be used.