Digested sludge recycling method and device

Abstract

The invention provides a digested sludge recycling method and a digested sludge recycling device. The device is mainly characterized in that the device is a multi-stage sewage treatment device provided with an internal-circulation reflux-jet mixing and discharging system, or a stirring mixing and pressure-difference discharging system. The device is composed of a sludge pretreatment space and a sludge-sewage separation treatment unit. The upper part of the sludge-sewage separation treatment unit is a sewage treatment space, and the lower part of the sludge-sewage separation treatment unit is a sludge digestion chamber. In the sludge digestion chamber, accumulated digested sludge is mixed and stirred, and is mixed with sewage, such that high-water-content slurry is formed, and the high-water-content slurry can be discharged through the discharging system and can be utilized in agricultural productions. With the method and the device, when sewage is being treated, digested sludge is converted into liquid slurry and can be utilized, such that resource utilization is realized, and secondary pollution is avoided. The method and the device facilitate energy saving and emission reduction.

Description

technical field [0001] The invention relates to a device for treating sewage and sludge. Background technique [0002] The key to sewage treatment is to deal with the problem of sludge. If the sludge in sewage treatment facilities is not properly treated, it will affect the quality of drainage water. In rural areas, domestic sewage can be used for irrigation and other planting aspects, but sewage is produced every day, and irrigation is time-sensitive, which is not very convenient for irrigation, and a lot of water needs to be discharged. Domestic sewage will produce sludge after treatment. The sludge is rich in organic matter, ammonia, nitrogen, phosphorus and other fertilizer substances, which can be used for soil improvement and plant fertilization. The amount of sludge accumulated in a year is limited, and the limited sludge can be used , more in line with the characteristics and needs of rural areas. Under normal circumstances, the sewage and sludge in the septic tank...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the sewage and sludge in the septic tank are mixed, fresh pollution continues to enter the septic tank, and the sludge that has not been fully digested is in a mixed state with the digested sludge, which still contains a large number of pathogens and sundries, and the septic tank The medium sludge presents different states such as sediment and floating matter. After a long period of sedimentation, the sludge forms concentrated sludge. The fluidity of the concentrated sludge is poor, which is not conducive to collection and utilization.

Images