A quick-start approach to thermal hydrolysis of the advanced digestive system

Abstract

The invention discloses a quick starting method of a high-grade thermal-hydrolysis digestion system and belongs to the technical field of treatment of sludge. The starting method comprises the following steps: firstly adjusting the inside of a reactor as anaerobic state; then adding materials into the reactor, wherein the materials comprise inoculation sludge and thermally hydrolyzed residual sludge; simultaneously adding the materials and starting a sludge discharging device of an anaerobic digestion reactor, and enabling the amount of the added materials to be consistent with the sludge discharging flow; and finally running the anaerobic digestion reactor and carrying out cultivation and acclimation of the digested sludge. According to the quick starting method of the high-grade thermal-hydrolysis digestion system, the thermally hydrolyzed sludge is added into the anaerobic digestion reactor; macromolecular organic compounds in the thermally hydrolyzed sludge can be hydrolyzed thoroughly, so that the content of soluble low-molecular-weight organic compounds is increased; the sludge can be directly used by anaerobic methanogenic bacteria for producing methane; the sludge can be directly introduced into the cultivation and acclimation stage; the starting time is shortened.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a rapid start-up method of a thermal hydrolysis advanced digestion system. Background technique [0002] As the total amount of sludge in sewage plants around the world continues to increase, sludge treatment technology has become a hot spot for research and exploration. The anaerobic digestion process has been widely used as an effective means of sludge reduction and stabilization. Some studies have pointed out that when the scale of the sewage plant reaches 18,900 tons / day or more, anaerobic digestion can be used as the main technical means for sludge stabilization. The sludge from the sewage plant contains a large amount of biodegradable organic matter. Generally, after 20-30 days of anaerobic digestion, the organic matter in the sludge is only degraded by 30%-50%. Therefore, it is necessary to strengthen the pretreatment of sludge anaerobic digestion Pro...

AI Technical Summary

Problems solved by technology

During the start-up process of the traditional anaerobic digestion system, facultative bacteria that are prone to hydrolysis and acidification grow dominantly, and continuously convert macromolecular organic matter into volatile organic acids. A large amount of organic acids accumulate, acidification is serious, and the pH of the digestive juice is too low, which eventually leads to anaerobic digestion. Oxygen digestion system failed to start

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