Sludge drying method and system

Abstract

The invention discloses a sludge drying method and system. The sludge drying method comprises the following steps: pre-drying wet sewage sludge with the moisture content of above 80% by adopting a mechanical filter pressing method so as to reduce the moisture content of the sludge to about 65%; crushing the pre-dried sludge into sludge powder, dispersing and flatly paving the sludge powder on baffle plates with fine meshes, piling up multiple layers of baffle plates, leaving voids among the sludge powder, and air-drying the sludge powder by using normal temperature air so as to reduce the moisture content of the sludge to about 45%; and feeding the piled and air-dried sludge powder into a drying groove, turning and throwing by using a turning and throwing device, and meanwhile air-drying the sludge powder by using the normal temperature air so as to reduce the moisture content of the sludge to below 30%. Dry air absorbing moisture in the sludge is discharged, subjected to purification treatment and emitted after meeting the environmental protection requirements, and the dried sludge is discharged from the drying groove and is further treated. According to the sludge drying method, external heat sources are not needed, and the rapid drying of sludge is realized at relatively low operating cost.

Description

technical field [0001] The invention relates to a sludge drying method and system, in particular to a sludge drying method and system integrating mechanical pressure filtration and air drying. Background technique [0002] With the expansion of sewage treatment scale and the improvement of standards, the amount of sludge generated continues to increase. In addition to the sludge accumulated in the past, China's sludge treatment and disposal has become a major issue in the field of sewage treatment. [0003] The moisture content of the sludge generated from the sewage treatment plant is very high, generally >80%. The sludge must be dried first to facilitate further disposal. At present, the main technical routes of sludge drying include thermal drying, mechanical drying, air drying, and solar drying. The construction cost and operation cost of thermal drying are too high, and the construction cost of solar energy is high, and the applicable area is narrow. The cost of me...

AI Technical Summary

Problems solved by technology

The construction cost and operation cost of thermal drying are too high, the construction cost of solar energy is high, and the applicable area is narrow

The cost of mechanical filtration and air drying is low, but mechanical drying can only dry the sludge to a moisture content of about 65%, while the efficiency of air drying is low

The effect of simply applying a technical means is not satisfactory

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