Sludge dehydrating and drying process method and device

Abstract

The invention belongs to the technical field of environmental engineering, in particular to a sludge dehydrating and drying process method and a device. The technical essential points of the invention are that: firstly, adding one or several of fly ash, fine manganese slag, calcined lime, ferric chloride solution and aluminum sulfate solution into sludge and dehydrating and conditioning the sludge; secondly, feeding the sludge into a pre-drying area and simultaneously adding a certain amount of calcined lime, potassium permanganate and finished product of dry sludge and uniformly mixing; feeding the sludge treated in the pre-drying area into a hollow paddle spiral indirect dryer; returning one part of finished product of dry sludge to the pre-drying area and carrying out drier back-mixing with wet sludge; supplying saturated heated steam to a drier by an electric boiler; and introducing steam tail gas from the drier to the pre-drying area for heating the wet sludge. The device is automatically controlled by a control center through a control bus. The process has the advantages of energy saving, environmental protection and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a process method and a device for dehydrating and drying excess concentrated sludge discharged from a sewage treatment plant for making lightweight sludge bricks. technical background [0002] my country is the world's largest developing country with a large population, and the resulting water pollution is becoming more and more serious. Therefore, water pollution prevention and control has attracted widespread attention. According to the fourth annual series report of China Water Network, it is estimated that by the end of 2010, at least nearly 3,000 sewage treatment plants in my country will be in operation, and a huge amount of sludge will be produced at that time; at the same time, the composition of sludge is complex, and it is a variety of microorganisms. The aggregate formed by the gelatin group and its adsorbed organic matter and inorganic mat...

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Problems solved by technology

[0009] In the traditional sludge treatment and disposal process, organic coagulants (such as PAM, etc.) are generally used for initial dehydration. Although the use of organic coagulants (such as PAM, etc.) The cost of polyacrylamide (PAM) is high, and the mud cake after dehydration of the sludge conditioned by adding PAM appears sticky, which is not conducive to the secondary dehydration and drying treatment of sludge. The most important thing is to add PAM to the sludge It has a negative impact on the performance of making lightweight brick blocks, which is not conducive to the resource utilization of sludge

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