Types of Wastewater Treatment Filters

There are various types of sludge. The composition, nature and quantity of sludge mainly depend on the source of wastewater, and are also closely related to the process of wastewater treatment filter element. The composition, nature and quantity of sludge are quite different depending on the source of wastewater. The composition, nature and quantity of sludge will be different for different treatment processes of the same waste water using a sewage treatment filter element equipment. The sludge in the sewage treatment plant of water treatment filter element equipment includes the following types: grid slag, grit chamber sediment, scum, primary sedimentation tank sludge and secondary sedimentation tank sludge. The characteristics of sludge in my country's urban water treatment filter sewage treatment plant include the following aspects: (1) Organic content. The organic content of sludge in my country's urban sewage treatment plant is generally only about 50%, which belongs to the sludge of low organic components. The organic components of sludge from urban sewage treatment plants in industrially developed countries are 70%-80%. (2) Carbohydrate content. Due to the low vss (volatile solid suspended solids) value in the domestic sewage of urban residents in my country, carbohydrates such as starch, sugar and fiber in the organic components account for a large proportion, while the fat content is very low. Therefore, my country's Municipal sewage sludge is a high-carbohydrate, low-fat sludge. (3) The relative density of sludge. The relative density of sludge refers to the ratio of the mass of sludge to the mass of the same volume of water. The relative density of sludge mainly depends on the moisture content of sludge and the relative density of solids. The greater the relative density of solids and the lower the moisture content, the greater the relative density of sludge. The relative density of domestic sludge is generally close to 1. The relative density of industrial sludge is often large. For example, the relative density of iron sludge is 5-6. (4) The content of heavy metal ions in the sludge. The content of heavy metal ions in sludge is determined by the proportion of industrial wastewater in urban sewage and the properties of industrial wastewater. After secondary treatment of sewage, about 50% of heavy metal ions in sewage are transferred to sludge. Therefore, the content of heavy metal ions in sludge is generally high. Therefore, when sludge is used as fertilizer, attention must be paid to whether the content of heavy metal ions in the sludge exceeds the relevant national standards.
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