Rapid air-drying method of residual activated sludge

Abstract

The invention relates to the technical field of residual activated sludge minimization and specifically relates to a rapid drying method of residual activated sludge. The method provided by the invention comprises the following steps of: adding lime milk into collected residual activated sludge, making the residual activated sludge into a flowing slurry, allowing the slurry to stand overnight in a reaction tank, supplementing a loosener after water completely oozes from the residual activated sludge and parasite eggs inside the residual activated sludge, uniformly stirring the residual activated sludge to form koji shape, flatly spreading a thin layer of the residual activated sludge inside an air-drying box (chamber), stirring, ventilating, and continuously operating until the water content of the activated sludge is reduced to 30-40%. According to the invention, wind energy is fully utilized to replace heat energy to dry the activated sludge. The method provided by the invention has advantages of low energy consumption, high efficiency, less equipment investment and simple operation, and is suitable for large enterprises of large-scale intensive production.

Description

technical field [0001] The invention relates to the technical field of excess activated sludge reduction, in particular to a method for quickly air-drying excess activated sludge. technical background [0002] Excess activated sludge is a kind of organic matter with high (crop / tree) nutrition and high fuel value, which has great practical value, but it needs to be fully dried to make good use of it. [0003] The activated sludge collected by the current sewage treatment plant has a high water content of about 80-85%, which is highly variable and cannot be used directly and needs to be dried. Commonly used drying methods include: 1) Drying with a dryer. The drying speed is fast, but the energy consumption is too large. Due to the strong viscosity and elasticity of the sludge during drying, the drying will be uneven and incomplete. ; 2) Natural stacking and drying, let it evaporate and dry naturally, but also because of its strong adhesion during the process, the surface will...

AI Technical Summary

Problems solved by technology

[0003] The activated sludge collected by the current sewage treatment plant has a high water content, about 80-85%, is highly variable, cannot be used directly, and needs to be dried

Commonly used drying methods include: 1) Drying with a dryer. The drying speed is fast, but the energy consumption is too large. Due to the strong viscosity and elasticity of the sludge during drying, the drying will be uneven and incomplete. ; 2) Natural stacking and drying, let it evaporate and dry naturally, but also because of its strong adhesion during the process, the surface will form a solid hard shell when it encounters wind, blocking the water vapor exchange between the interior and exterior space, and the interior will last for a long time It cannot be dried, and it constantly emits an unpleasant smell to the surroundings, and its application is often limited; 3) The turning and throwing machine is used for drying, and special equipment is used to raise the sludge to increase the interface between it and the air and speed up the moisture loss. Lost, but the price of flipping the fuselage is too high, and the drying strength and speed are only slightly better than the thin layer of natural stacking, which is far from meeting people's ideal needs

Images