Sludge treatment device and method of prepositioning multi-stage pretreatment enhanced thermal hydrolysis

By employing a multi-stage pretreatment and chemical conditioning method for sludge treatment, the problems of high energy consumption and the generation of new pollutants in sludge thermal hydrolysis have been solved, achieving efficient sludge treatment, reducing energy consumption, and improving the thermal hydrolysis effect.

CN120622766BActive Publication Date: 2026-06-16JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
Filing Date
2025-06-11
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing sludge hot water hydrolysis technologies suffer from high energy consumption, the generation of new pollutants, and poor hot water hydrolysis efficiency. Moreover, most methods only include a pretreatment step, which cannot effectively solve these problems.

Method used

The method of enhancing hot hydrolysis by adopting a multi-stage pretreatment process includes two-stage pretreatment of dry anaerobic digestion and pulping, combined with conditioning with a compound agent of potassium sulfite, tannic acid and potassium ferrate, followed by hot hydrolysis and multi-stage flash steam treatment, using biogas and flash steam as heat sources to reduce external steam input.

Benefits of technology

It reduces energy consumption in sludge hydrolysis, reduces the generation of new pollutants, improves hydrolysis efficiency, enhances process stability, and reduces treatment costs.

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Abstract

The application discloses a sludge treatment device and method of preposition multi-stage pretreatment reinforced thermal hydrolysis, which comprises a multi-stage pretreatment unit, a thermal hydrolysis tank, a multi-stage flash evaporation unit and a wet anaerobic digestion tank which are sequentially communicated through material pipelines, and a steam generator which is communicated with the wet anaerobic digestion tank through a biogas pipeline; the multi-stage pretreatment unit is composed of a dry anaerobic digestion tank and a slurry tank which are sequentially communicated through material pipelines; and the slurry tank is communicated with the thermal hydrolysis tank through a material pipeline. The sludge treatment device and method of preposition multi-stage pretreatment reinforced thermal hydrolysis weaken the negative influence of melanoidin produced by Maillard reaction in the thermal hydrolysis process through multi-stage pretreatment, improve the thermal hydrolysis efficiency, reduce the thermal hydrolysis reaction temperature and further reduce the energy consumption, and the biogas energy produced by anaerobic digestion provides high-temperature steam for the pretreatment, and further reduces the cost.
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