Residual sludge dewatering and drying method and device

Abstract

,The invention relates to a residual sludge dewatering and drying method and device. The residual sludge dewatering and drying method comprises the following steps: (A) centrifugal dewatering of residual sludge, (B) adding a certain proportion of dispersion medium and uniformly mixing, (C) non-phase change drying of a residual sludge-dispersion medium mixture through rotational flow rotation (D) dried sludge-dispersion medium mixture airflow acceleration separating, (E) dried sludge rotational flow autorotation re-dehydration and particle trapping, (F) carrying out rotational flow gas-liquid separation on water-containing gas in a gas-liquid separation tower to obtain pure hot gas and heat-containing waste water, wherein the pure hot gas and supplementary air can form inlet gas to be recycled; and (G) transferring waste heat of the heat-containing wastewater into raw sewage of a sewage treatment plant through an intermediate heat exchanger, and transferring low-level heat energy in the raw sewage into inlet gas through a sewage source heat pump unit to realize heating of the inlet gas and recovery of heat energy of the sewage.

Description

technical field

[0001] The disclosure belongs to the field of chemical industry and environmental protection, and relates to a method and a device for realizing water removal of excess sludge in a sewage treatment plant, sorting and recycling of sludge dispersion media, and providing thermal energy required by the system through a sewage source heat pump. Specifically, the present disclosure relates to a method and device for dehydrating and drying excess sludge in a sewage treatment plant. Background technique

[0002] With the rapid development of urbanization and the continuous improvement of the level of industrialization in my country, the amount of sewage treatment continues to increase. As of the end of 2019, the annual sewage discharge of cities and counties in my country was 564.8 billion cubic meters, and 4,140 sewage treatment plants had been built with a daily processing capacity of 2.15 billion cubic meters. With the gradual improvement of my country's sewage t...

Examples

Embodiment 1

[0086] In a device for dewatering and drying excess sludge in a sewage plant, the method and device of the present invention carry out deep dehydration of excess sludge. The specific operation process and effects are described as follows:

[0087] 1. Sources and properties of excess sludge

[0088] The excess sludge used in this example was taken from the secondary sedimentation tank of a sewage treatment plant in Shanghai. Before the experiment, the excess sludge was pretreated and its properties were measured. The sludge was free-settled and the settled sludge in the lower layer was taken as the experiment. Using sludge, Table 1 shows the measured properties of the remaining sludge.

[0089] Table 1 Properties of remaining sludge

[0090]

[0091] 2. Implementation process

[0092] The material used in this example is the remaining sludge from the secondary sedimentation tank of the sewage plant, air is used as the gas carrying the sludge, and cinder particles with low ...

technical field

[0001] The disclosure belongs to the field of chemical industry and environmental protection, and relates to a method and a device for realizing water removal of excess sludge in a sewage treatment plant, sorting and recycling of sludge dispersion media, and providing thermal energy required by the system through a sewage source heat pump. Specifically, the present disclosure relates to a method and device for dehydrating and drying excess sludge in a sewage treatment plant. Background technique

[0002] With the rapid development of urbanization and the continuous improvement of the level of industrialization in my country, the amount of sewage treatment continues to increase. As of the end of 2019, the annual sewage discharge of cities and counties in my country was 564.8 billion cubic meters, and 4,140 sewage treatment plants had been built with a daily processing capacity of 2.15 billion cubic meters. With the gradual improvement of my country's sewage t...

Examples

Embodiment 1

[0086] In a device for dewatering and drying excess sludge in a sewage plant, the method and device of the present invention carry out deep dehydration of excess sludge. The specific operation process and effects are described as follows:

[0087] 1. Sources and properties of excess sludge

[0088] The excess sludge used in this example was taken from the secondary sedimentation tank of a sewage treatment plant in Shanghai. Before the experiment, the excess sludge was pretreated and its properties were measured. The sludge was free-settled and the settled sludge in the lower layer was taken as the experiment. Using sludge, Table 1 shows the measured properties of the remaining sludge.

[0089] Table 1 Properties of remaining sludge

[0090]

[0091] 2. Implementation process

[0092] The material used in this example is the remaining sludge from the secondary sedimentation tank of the sewage plant, air is used as the gas carrying the sludge, and cinder particles with low ...

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