High temperature aerobic digestion device for sludge

Abstract

The high temperature aerobic sludge digesting apparatus has sludge circulating system comprising sludge circulating pipeline, sludge circulating bump and sludge flowmeter; sludge aerating system comprising aerating pipeline, aerating bump and gas flowmeter; and digesting pond covered with heat insulting material. The sludge jetting section of the sludge circulating pipeline is set horizontally in the bottom of the digesting pond, the aerating section of the aerating pipeline is set below the sludge jetting section, sludge defoaming pipeline is located below the gas exhausting pipeline, the gas valve of the defoaming pipeline is connected to the aerating pipeline, and liquid sludge valve is connected to the sludge circulating pipeline. The present invention has separated sludge aerating system and sludge circulating system, conventional aerating process and direct defoaming.

Description

technical field [0001] The invention relates to a high-temperature aerobic digestion device for sludge, which is used for high-temperature aerobic stable treatment of biomass sludge in sewage plants. It belongs to the field of environmental engineering technology. Background technique [0002] At present, high-temperature aerobic digestion of sludge mostly adopts two-stage or multi-stage high-temperature aerobic digestion devices, and there are also high-temperature aerobic digestion devices with single-stage design. In recent years, due to the improvement of aeration system and defoaming system, sludge in a single stage High temperature stabilization can be obtained in the single-stage high-temperature aerobic digestion unit. This improved single-stage high-temperature aerobic digestion unit is called the second-generation high-temperature aerobic digestion unit, which has been produced by Thermal Process Systems in the United States. The second-generation high-temperature...

AI Technical Summary

Problems solved by technology

The device is round or rectangular. The sludge is refluxed and stirred by the sludge circulation system. The aeration hole of the sludge aeration pipe is set in the sludge return pipe. This structure can break up the air bubbles mixed in the sludge injection process to improve the oxygen transfer efficiency. However, the manufacturing requirements are relatively high. If the design is not proper, it will be more difficult to repair and adjust, and it may be It is difficult to achieve effective oxygen transfer and affect the high temperature aerobic digestion effect of sludge

In addition, the liquid formed after the screen defoaming in this device is collected by a funnel and then returned by a power pump. The screen defoaming has a certain defoaming effect, but the problem of foam overflow cannot be completely eliminated, and this This defoaming measure has high energy consumption, and the system structure is also complicated

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