Brick making method for sludge of sewage treatment plant

Abstract

The invention relates to a brick making method for sludge of a sewage treatment plant. The method comprises the steps: (1) subjecting the sludge of the sewage treatment plant to ultrasonic wave radiation for 30 to 90 minutes, wherein the sound energy density of ultrasonic waves is 0.5w / mL to 3w / mL; (2) mixing the radiated sludge, coal cinder, crushed construction waste and wood sawdust according to the volume ratio of 10: 5: 3: 1, and carrying out stirring, so as to obtain a brick making raw material; (3) preparing unburnt bricks from the brick making raw material through die pressing; (4) roasting the unburnt bricks at the roasting temperature of 700 DEG C to 800 DEG C under the condition that the degree of vacuum is smaller than 0.1, thereby obtaining finished bricks. The method is not only environmentally friendly, but also is high in brick making efficiency.

Description

technical field [0001] The invention relates to a method for making bricks from sewage treatment plant sludge, belonging to the technical field of urban garbage treatment. Background technique [0002] At present, the treatment of a large amount of domestic sewage in urban filling - the sludge with a water content of 60-85% (including crystal water) after the sedimentation sludge is pressed, filtered and pre-dehydrated is strictly prohibited by local governments because it contains heavy metals and other harmful substances. On-site landfill, although chemically dehydrated and then burned in a furnace or disposed of by a cement factory, the amount of digestion is far from meeting the amount of production. [0003] The sludge of domestic sewage treatment plants is full of 80% water, and most of them are crystalline water bodies that are difficult to evaporate even if they are exposed to the sun. In order to reduce the water content of sludge from domestic sewage plants in cit...

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment of a large amount of domestic sewage in urban filling - the sludge with a water content of 60-85% (including crystal water) after the sedimentation sludge is pressed, filtered and pre-dehydrated is strictly prohibited by local governments because it contains harmful substances such as heavy metals. Landfill on site, although it is dehydrated by chemical method and then incinerated or disposed of by cement factory, but the amount of digestion is far from meeting the amount of production

[0003] The sludge of domestic sewage treatment plants is full of 80% water, and most of them are crystalline water bodies that are difficult to evaporate even if they are exposed to the sun. In order to reduce the water content of sludge from urban domestic sewage plants (even if the water content is reduced to 80% to 60%), the investment in energy and capital required is seriously outweighed by the gain, and secondary pollution is also inevitable