A kind of sewage sludge treatment and recovery and recycling method

Abstract

The invention relates to a sewage sludge treatment, recovery and recycling method. sewage containing sludge sequentially passes a sludge inlet hopper, a balance weight sludge discharging plate, sludgeraking assemblies, a sludge scraping plate and a flexible sludge paving plate and enters a dewatering assembly, two sections of a filter belt are driven to operate by a driving roll and a driven roll, and the two sections of the filter belt located in a rack coincide and are tightly pressed to squeeze passing sludge; two sections of the filter belt outside the rack are separated between the driving roll and the driven roll, the squeezed sludge is squeezed out. The filter belt circles in an S shape among multiple rolling rolls, sludge is sufficiently ground in the circular grinding process, and further dewatering of the sludge is guaranteed. The water content of a sludge cake finally squeezed through the steps meets the corresponding requirements. By means of the sewage sludge treatment method, sludge and other sediments with inorganic matter as main components in sewage can be efficiently compressed and ground and finally form the sludge cake, the treated water is clear, the producedsludge cake contains rich nutritional elements and the treated water and the sludge cake can be used for irrigation and fertilization of crops and are high in utilization rate.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage sludge treatment and recycling method. Background technique [0002] Water is the source of life, a necessary condition for the existence of life and economic development, and also an important part of human tissue. However, with the continuous development of heavy industry and chemical industry, the pollution of water resources is becoming more and more serious. Sewage contains a large amount of nitrogen, phosphorus, potassium and other elements, which can easily lead to eutrophication of aquatic organisms. If things go on like this, more and more green algae and other plants will emerge in the water, affecting water quality and natural landscape. At the same time, when the organic matter in the sewage is decomposed by microorganisms, the oxygen in the water is consumed, which affects the life of aquatic organisms. After the dissolved oxygen in the water is ex...

AI Technical Summary

Problems solved by technology

However, the sediment and other substances deposited by the physical deposition method are only dispersedly deposited on the bottom of the water and are difficult to collect, which conflicts with the concept of sustainable development; at the same time, the substances precipitated by the chemical deposition method contain a large number of acid radicals, which affect the pH of the water itself value

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