Sludge two-phase anaerobic treatment process based on sulfonyl porphyrin iron catalyst Fenton-like system

Abstract

The invention discloses a sludge two-phase anaerobic treatment process based on a sulfonyl porphyrin iron catalyst Fenton-like system. The process comprises the following steps: mixing a sulfonyl porphyrin iron catalyst, methanol and a hydrogen peroxide solution, and stirring to obtain a mixed solution; mixing the mixed solution with sludge, acidizing, centrifuging, and filtering to obtain supernatant; and mixing the supernatant with the inoculated sludge, and carrying out anaerobic digestion treatment to complete the treatment of the sludge. According to the two-phase anaerobic treatment process for the sludge, the acidification effect on the sludge is remarkably improved through pretreatment of the sulfonyl porphyrin iron catalyst Fenton-like system, then the anaerobic digestion effect is remarkably improved, and the two-phase anaerobic treatment process has the advantages of being low in reagent dosage, mild in reaction condition, high in treatment efficiency, high in methane yield, good in adaptability and the like; and the sludge can be effectively treated, a large amount of biogas / methane can be obtained, and the process has very important significance for improving the subsequent resource utilization effect of the sludge, and is high in use value and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to a sludge two-phase anaerobic treatment process based on a sulfonic acid porphyrin iron catalyst Fenton-like system. Background technique [0002] Anaerobic digestion is a common method for sludge treatment and disposal. It is generally believed that anaerobic digestion consists of four steps: hydrolysis, acid production, acetic acid production, and methane production. However, the extracellular polymer blocks the direct contact between the hydrolytic bacteria and the organic substrate, making the hydrolysis step difficult and slow, resulting in a long gas production cycle and low gas production in anaerobic sludge digestion. The advanced oxidation method can destroy the basic structure of extracellular polymers, dissolve sludge cells, and promote the rapid hydrolysis step, thereby effectively improving the sludge anaerobic digestion process. [0003] The Fenton system is ...

AI Technical Summary

Problems solved by technology

However, in the actual research process of the inventors of the present application, it is found that the iron porphyrin-hydrogen peroxide Fenton system pretreatment sludge still has the following defects: The reagent diffusion and mass transfer efficiency of the sludge system have a negative effect, resulting in the hydroxyl substitution of chloride ions and the coordination of hydrogen peroxide being hindered, which is not conducive to the process of oxygen-oxygen bond heterolysis; 2) The sludge system has complex and changeable characteristics, so it cannot It is conducive to the occurrence of oxygen-oxygen bond heterocleavage process, so it is difficult to stably produce a sufficient amount of high-valent iron oxide species. The existence of the above problems makes it difficult for the existing metalloporphyrin-based Fenton system to effectively hydrolyze sludge, which is not conducive to Improve subsequent anaerobic digestion

At the same time, excess volatile organic acids (VFA) and ammonia nitrogen are produced during sludge hydrolysis using the iron porphyrin-hydroperoxide Fenton-like system, and the presence of these substances inhibits the activity of methanogens , resulting in difficulty in increasing methane production

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