Multistage dehydration method for gaseous oxidation sewage sludge

Abstract

The invention discloses a multistage dehydration method for gaseous oxidation sewage sludge. The multistage dehydration method mainly uses an apparatus comprising an active gas generator (1), a spiral filtering apparatus (2) and an oxidation drum (3), wherein the spiral filtering apparatus (2) comprises a spiral shaft (2.1), spiral blades (2.2) and a spiral drum (2.3); the spiral shaft (2.1) is installed in the spiral drum (2.3); the spiral blades (2.2) are arranged on the spiral shaft (2.1) and arrayed between the spiral shaft and the inner wall of the spiral drum; the spiral shaft is hollow; an end inlet of the spiral shaft is communicated with the active gas generator; the wall of the spiral shaft is provided with a vent allowing active gas to enter; and the tail end of the spiral drum (2.3) is connected with the oxidation drum (3). The multistage dehydration method provided by the invention has a wide application scope and low energy consumption, is beneficial for sludge reduction and enables treated sludge to have low water content.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a multistage dehydration method for gas oxidation sewage sludge. Background technique [0002] As of 2015, the amount of sludge in my country has reached 40 million tons (80% moisture content), and it is expected to reach 60 million tons by 2020. If such a huge sludge cannot be properly resolved, it will have a significant impact on the environment and become a A big burden on people's production and life. Due to the high water content of sludge, difficult dehydration, rich in organic matter, easy to rot, and odorous; it contains pollutants such as pathogenic microorganisms and heavy metals, which makes the disposal and treatment of sludge very troublesome. [0003] According to my country's "Sludge Treatment and Disposal and Pollution Prevention and Control Technology Policy of Urban Sewage Treatment Plants", the treatment and disposal of urban sewage sludge must follow th...

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Problems solved by technology

[0008] In view of this, the present invention aims at the problems in the above-mentioned prior art that the moisture content of the dehydrated sludge is too high, there are many wearing parts, the energy consumption is large, and it is not conducive to the reduction, and provides a kind of Multi-stage dehydration method of gas oxidation sewage sludge with low water content, favorable for sludge reduction and low sludge moisture content

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