Anaerobic digestion sludge dewatering method

Abstract

The invention discloses an anaerobic digestion sludge dewatering method. By adopting the anaerobic digestion sludge dewatering method, secondary utilization can be performed on sludge, the sludge is prepared into a sludge activated carbon material firstly, sludge activated carbon and a biological flocculant are adopted for combined conditioning, and deep dewatering of the sludge or anaerobic digestion sludge is realized; by taking the sludge activated carbon as a skeleton structure substance, the floc structure strength of the sludge is strengthened through the hydrophobic interaction, viscousmacromolecular organic matters including humic acid and proteins and the like in a liquid phase of the anaerobic digestion sludge are removed synchronously, the filter performance of the sludge is improved, an organic load of subsequent reflux biochemical treatment is lowered; and then by further utilizing the biological flocculant for coagulation, sludge-water separation is promoted, and efficient deep dewatering of the anaerobic digestion sludge is realized. The dewatering method provided by the invention is an environment-friendly conditioning method and can improve the filtering and dewatering efficacy of the anaerobic digestion sludge specially aiming to the characteristics of small particles, high concentration of a dissolved microbial metabolite, poor filter performance and the like of the anaerobic digestion sludge.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, more specifically, to a method for anaerobic digestion sludge dehydration. Background technique [0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. In the process of urban sewage treatment, the sewage can be discharged up to the standard after a series of treatments, and a large number of pollutants are enriched, concentrated and transferred to the sludge. Sludge from urban sewage treatment plants not only has high water content, is perishable, and has a strong odor, but also contains a large number of pathogenic bacteria, parasite eggs, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances that are difficult to degrade, such as polycyclic aromatic hydrocarbons. Sludge is safe The pressure to deal with is huge. The untreated sludge is randomly piled up, and a...

AI Technical Summary

Problems solved by technology

However, anaerobic digestion process is generally used in sludge treatment. The so-called anaerobic digestion process is an important way to recover energy from sludge. It can effectively decompose macromolecular organic matter in sludge and achieve sludge stabilization. However, the formed anaerobic digested sludge often has small particles and high alkalinity, and it is difficult to achieve efficient dehydration of sludge by common chemical conditioning methods

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