Sludge dewatering process and system employing combination of sludge wall-breaking and ultrahigh-pressure squeezer

Abstract

The invention discloses a sludge dewatering process and system employing a combination of sludge wall-breaking and an ultrahigh-pressure squeezer. The sludge dewatering process comprises the following steps: 1) performing sludge wall-breaking treatment on raw sludge with a moisture content of 97%; 2) carrying out dosing flocculation conditioning on the sludge having been subjected to the sludge wall-breaking treatment; and 3) carrying out ultrahigh-pressure squeezing on the flocculated and conditioned sludge under a squeezing pressure of 2-10 Mpa until the water content of the squeezed sludge is lower than 50%, and then conveying the sludge for outward transportation treatment. The sludge dewatering process employing the combination of sludge wall-breaking and the ultrahigh-pressure squeezer has the advantages that chemical consumption is low; dehydration effect is good; and batch operation time is shortened, and operation efficiency is improved.

Description

Technical field [0001] The present invention relates to a sludge treatment technologies, and particularly relates to a process and a system for sludge dewatering sludge broken UHP press bonded. Background technique [0002] With industrialization, sludge production increases. Sewage treatment plant sludge is generally employed nearly 58% of landfill, land use using nearly 15%, for building materials using about 8%, about 6% incinerated. Sewage treatment plants commonly used in landfill or simple stacking approach to sludge, sludge treatment and disposal of the current situation is grim. [0003] With the increasing requirements sludge treatment, sludge standards specified generation, transportation, storage, treatment and disposal of the whole process should meet the relevant standards of pollution control, wherein the sewage treatment plant to the reservoir (i.e., not disposal) for the purpose of transport sector factory sludge, the sludge must be dewatered to a standard moistur...

AI Technical Summary

Problems solved by technology

[0005] The conventional method of sludge treatment in the prior art is to use the method of squeezing after adding organic and inorganic agents to condition, yet, for high water content (water content 97%) sludge dehydration, this method is pressed in the press Finally, it is difficult to achieve a sludge moisture content lower than 50%, usually the moisture content is about 60%. Therefore, in order to achieve a sludge moisture content of 50%, there is currently a method of adding lime to the sludge before pressing. The water content of the sludge is reduced through lime water absorption. However, it has the disadvantages of large chemical consumption, large lime consumption, and high operating costs, and the addition of lime will indirectly reduce the impact of the press on sludge. In addition, what is more serious is that the calorific value of the sludge will be low due to the doping of a large amount of water-absorbing lime, which is very unfavorable to the subsequent sludge incineration (especially independent incineration), and affects the treatment effect of sludge incineration

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