Sludge dewatering pretreatment apparatus and sludge dewatering pretreatment method

Abstract

The invention discloses a sludge dewatering pretreatment apparatus and a sludge dewatering pretreatment method. The apparatus comprises a mechanical crushing pretreatment device, a sludge transfer pump, a first sludge and reagent mixer, a first serpentine tube, an ultrasonic reactor, a second sludge and reagent mixer, a second serpentine tube, a stirring device and a concentrating filter press; the mechanical crushing pretreatment device is used for crushing block impurities in the sludge, and the outlet of the mechanical crushing pretreatment device is connected with the sludge transfer pump;the first sludge and reagent mixer is connected with the sludge transfer pump and the first serpentine tube respectively, and is used for mixing a sludge conditioning reagent with the sludge; the ultrasonic reactor is arranged on the outer wall of a pipeline between the first serpentine tube and the second sludge and reagent mixer; the second sludge and reagent mixer is connected with the secondserpentine tube, and is used for mixing a flocculant with the sludge; and the inlet of the stirring device is connected with the second serpentine tube, and the outlet of the stirring device is connected with the concentrating filter press. The method has the advantages of short sludge conditioning time, completeness in sludge modification, and high sludge dewatering efficiency.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge dehydration pretreatment device and method. Background technique [0002] The national sludge production scale is huge, but the harmless disposal rate is low. Existing sludge disposal routes include land use, landfill, building material utilization, incineration, etc. Land use due to excessive heavy metals leads to poor paths; landfill is a temporary transitional technical route, which is combined with front-end deep dehydration and has become the route with the most application cases at this stage, but the addition of chemicals is large, and the sludge increment is obvious, and There is secondary pollution; the utilization of building materials is due to the high moisture content of sludge and the small amount of mixing, and the addition of a large amount of chemicals to the front-end dehydration leads to strong corrosion of the sludge. At present, ...

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Problems solved by technology

Land use due to excessive heavy metals leads to poor paths; landfill is a temporary transitional technical route, which is combined with front-end deep dehydration and has become the route with the most application cases at this stage, but the addition of chemicals is large, and the sludge increment is obvious, and There is secondary pollution; the utilization of building materials is due to the high moisture content of sludge and the small amount of mixing, and the addition of a large amount of chemicals to the front-end dehydration leads to strong corrosion of the sludge. At present, many collaborative cement projects have been shut down; incineration is currently the most effective way to solve the sludge problem. The thorough method is also the most mainstream technology for sludge disposal in the world. However, the sludge in my country has low calorific value, high moisture content, and large sediment content. The traditional drying equipment wears a lot, and the operation and maintenance are complicated, resulting in high drying costs.

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