Rotating sand settling device and technology

Abstract

The invention discloses a rotating sand settling device and technology. The device comprises a sand settling tank, wherein the sand settling tank comprises a lower inverted-cone-shaped sand settling area and an upper cylindrical water inlet and outlet area, wherein a water inlet, a water outlet and a flow guiding device are arranged in the water inlet and outlet area; a polluted sand outlet is arranged at the bottom of the sand settling area; water flowing in from the water inlet is guided to the inner wall of the sand settling area by the flow guiding device; a sand washer and stirring blades are further arranged in the sand settling tank; the stirring blades are arranged in the middle of the sand settling tank and between the sand settling area and the water inlet and outlet area; the sand washer comprises a sand suction and discharge pipe, a sand washing tank and a sand washing sewage pipeline; the sand washing tank comprises a lower sand washing area and an upper buffer area; a sand inlet and outlet port is formed in the bottom of the sand washing area of the sand washing tank. With the device and the technology, the water inlet speed can be increased, the treating efficiency of the sand settling tank for sand with the grain size ranging from 25 mu m to 35 mu m can be improved while the separation efficiency of the sand and organic matter can be increased, the treating efficiency can be up to 90%, and the investment and the running cost are saved.

Description

technical field

[0001] The invention relates to a rotary sand setting equipment and its technology. Background technique

[0002] The grit chamber accounts for a small proportion in the investment and land occupation of sewage treatment plants, but it is an indispensable pretreatment facility in urban sewage treatment plants. Its main function is to remove sand in sewage and reduce the impact of sand on Excessive wear and tear on mechanical equipment. Installing the grit chamber before the subsequent treatment equipment can reduce the operation and maintenance costs of the wastewater treatment facility. Sand particles are inorganic substances and cannot be removed by biological methods. If the grit chamber is cancelled, a large amount of sand particles will enter the subsequent treatment unit, which will bring many hidden dangers to the normal operation of the sewage plant. In fact, the smaller the sand particle size in the water body, the better the normal operation of th...

Examples

Embodiment

[0032] A grit chamber with a diameter of 1.8m and a height of 3m is designed to treat urban sewage whose influent sand particle size is 25-45μm, accounting for 90% of an urban sewage plant. Orthogonal experiments were carried out at water inlet speeds of 4m / s, 3m / s, and 2m / s, hydraulic retention times of 40s, 50s, and 60s, and stirring linear speeds of 0.7m / s, 0.6m / s, and 0.5m / s. The particle size of effectively separated sand particles is ≥ 25 μm as a reference index. The results show that the treatment effect is the best when the water inlet speed is 3m / s, the hydraulic retention time is 60s, and the stirring line speed is 0.6m / s. The minimum sand separation rate is 90.73%, and the maximum is 94.58%.

technical field

[0001] The invention relates to a rotary sand setting equipment and its technology. Background technique

[0002] The grit chamber accounts for a small proportion in the investment and land occupation of sewage treatment plants, but it is an indispensable pretreatment facility in urban sewage treatment plants. Its main function is to remove sand in sewage and reduce the impact of sand on Excessive wear and tear on mechanical equipment. Installing the grit chamber before the subsequent treatment equipment can reduce the operation and maintenance costs of the wastewater treatment facility. Sand particles are inorganic substances and cannot be removed by biological methods. If the grit chamber is cancelled, a large amount of sand particles will enter the subsequent treatment unit, which will bring many hidden dangers to the normal operation of the sewage plant. In fact, the smaller the sand particle size in the water body, the better the normal operation of th...

Examples

Embodiment

[0032] A grit chamber with a diameter of 1.8m and a height of 3m is designed to treat urban sewage whose influent sand particle size is 25-45μm, accounting for 90% of an urban sewage plant. Orthogonal experiments were carried out at water inlet speeds of 4m / s, 3m / s, and 2m / s, hydraulic retention times of 40s, 50s, and 60s, and stirring linear speeds of 0.7m / s, 0.6m / s, and 0.5m / s. The particle size of effectively separated sand particles is ≥ 25 μm as a reference index. The results show that the treatment effect is the best when the water inlet speed is 3m / s, the hydraulic retention time is 60s, and the stirring line speed is 0.6m / s. The minimum sand separation rate is 90.73%, and the maximum is 94.58%.

Images