Method for improving anaerobic digestion performance of excess activated sludge

Abstract

The invention discloses a method for improving anaerobic digestion performance of excess activated sludge. The method comprises the steps: adding inoculated sludge and excess activated sludge into a reactor according to a volume ratio of 1 to 3, and adding distilled water into the reactor for dilution until the total solid concentration of the mixed sludge is 15.00g / L, the total volatile solid concentration is 9.54g / L and the total chemical oxygen demand is 1383gmg / L; adjusting the pH value of the mixed sludge to be 7.0+ / -0.2; then adding 1-30g / L rusted waste scrap iron and 1-5g / L magnesium chloride, and introducing N2; finally placing the reactor into a water bath constant-temperature oscillator, and continuing reaction for 30 days, wherein the revolving speed is 150rmp, the reaction temperature is 35 DEG C. According to the method, the rusted waste scrap iron and the magnesium chloride are added into the mixed sludge to enhance the anaerobic digestion methanogenesis performance of the excess activated sludge and improve the recovery rate of a phosphorus element.

Description

technical field [0001] The invention relates to a method for improving the anaerobic digestion performance of excess activated sludge, in particular to a method for utilizing rusty scrap iron (RSI) and magnesium chloride to strengthen anaerobic digestion of excess activated sludge to produce methane. Background technique [0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. According to the "2013-2017 China Sludge Treatment and Disposal In-depth Research and Investment Strategic Planning Analysis Report", 3,501 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of about 147 million cubic meters per day. In order to achieve the country's emission reduction goals It has made great contributions to the improvement of water environment. The most direct result of the large-scale construction and operation of sewage treatment plants is a substantia...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the technical problem to be solved by this invention is to provide a method of improving the anaerobic digestion performance of remaining activated sludge and reclaiming phosphorus by adding rusty scrap iron (RSI) and magnesium chloride, which overcomes the traditional anaerobic In the process of oxygen digestion, the degradation of organic matter is not complete, and the efficiency of methane production is low. At the same time, there is no need for intensive pretreatment of sludge, which avoids the technical defects of high energy consumption and low efficiency in pretreatment methods, and can greatly improve the system's phosphorus efficiency. Improve the recovery rate of elements and reduce the content of phosphorus in sludge

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