Sewage treatment and sludge recycling system

Abstract

The invention discloses a sewage treatment and sludge recycling system including a lifting device and a biochemical device; the biochemical device is connected with a drainage device and a sludge backflow well; the sludge backflow well is connected with a concentration tank and a sludge dewatering device successively, the concentration tank is connected to the biochemical device, and the sludge dewatering device is connected to the concentration tank and the lifting device; a sludge mixed liquid enters the biochemical device through the lifting device and is subjected to chemical treatment and is precipitated, sewage is discharged after being treated by the drainage device, generated sludge enters the concentration tank through the sludge backflow well, is concentrated and then is treated by the sludge dewatering device, dried sludge obtained from treatment is carried away, rinsing water generated in a filter pressing process is recycled and is subjected to precipitation treatment, generated water is directly transported to the lifting device and is treated, generated precipitated sludge is transported into the concentration tank, and upper clear water generated in the concentration tank is transported into the biochemical device; the operation cost can be reduced, and the consumption of electrical energy is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a system for recycling sludge. Background technique [0002] When carrying out sewage treatment, it is necessary to use a belt filter press to filter the sludge. Some flushing water will be generated during the sludge filtration. The current treatment method for the flushing water is to directly send it into the biochemical system for biochemical treatment. This will inevitably increase the operating cost of the sewage treatment plant, mainly due to the following four points: [0003] (1) The flushing water contains polyacrylamide, namely PAM, and PAM is an organic polymer, and it is also a polymer water treatment flocculant product. Its viscosity is very high. When the flushing water is directly introduced into the biochemical system , will adhere to the inner wall of the pipeline together with the sludge particles, causing the blockage of the pipeline, and even making...

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Problems solved by technology

[0003] (1) The flushing water contains polyacrylamide, namely PAM, and PAM is an organic polymer, and it is also a polymer water treatment flocculant product. Its viscosity is very high. When the flushing water is directly introduced into the biochemical system , will adhere to the inner wall of the pipeline together with the sludge particles, causing the pipeline to be blocked, and even make the delivery pipeline lose its function

[0004] (2) The main indicators such as BOD5, CODcr, NH3-N, TP, and SS in the flushing water are relatively high compared with the influent sewage, so the flushing water directly enters the biochemical system for further decomposition and digestion will consume a large amount of dissolved oxygen , increase power consumption, thereby increasing the operating cost per ton of water

[0005] (3) The biochemical ratio of the flushing water is very high, which will increase the difficulty of management during operation

[0007] It can be seen that directly introducing flushing water into the biochemical system will do a lot of useless work, and then form a vicious circle, which will increase the operating cost of the sewage plant invisibly

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