Sludge drying system

Abstract

The invention discloses a sludge drying system, comprising a sludge concentrating unit, a sludge stabilizing unit and a sludge drying unit which are connected in sequence, wherein the sludge concentrating unit comprises a belt sludge concentrator which is provided with a PAM adding device, the sludge stabilizing unit is provided with a medium-temperature sludge anaerobic digestion tank which is provided with a biogas outlet, the sludge drying unit comprises a sludge centrifugal dehydrator, a sludge storage tank, a sludge high-voltage electro-osmosis unit and a sludge cake hopper which are connected in sequence, the sludge high-voltage electro-osmosis unit is provided with a deodorizing device, and the sludge cake hopper is connected with a composting device, a burning device and/or a dumping device. The sludge drying system realizes quantitative reduction, harmlessness and recycling of sludge without addition of a reagent.

Description

technical field [0001] The invention relates to a sludge treatment technology, in particular to a sludge drying treatment system. Background technique [0002] With the continuous increase of the current sewage treatment rate, the output of sludge has shown a sharp upward trend, and the treatment and disposal of sludge has become the main factor restricting the development of many cities. Although most sewage treatment plants have concentrated and dewatered their sludge, the water content of the dewatered sludge after this simple concentrated dehydration treatment is usually still high, which makes the sludge treatment not in place, which not only increases the difficulty of transportation , and pose a threat to the surrounding environment of the transportation route, but what is more serious is that it brings great inconvenience to the subsequent sludge disposal: when composting, it cannot meet the moisture content requirements; when it is landfilled, it cannot reach the la...

AI Technical Summary

Problems solved by technology

High-pressure diaphragm box-type filter press can reduce the moisture content of sludge to less than 50% of the landfill standard, but a large amount of quicklime and iron salt must be added, and the additives account for about 30% to 40% of the dry basis of sludge.

The purpose of sludge reduction is not really achieved, and the calorific value of sludge is further reduced, which increases the difficulty of subsequent sludge disposal. For example, the compacted layer of the landfill is arched due to methane accumulation, and the leachate phosphorus removal process is more difficult.

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