Method for producing organic fertilizer by use of pretreated sludge

Abstract

The invention provides a method for producing organic fertilizer by use of pretreated sludge. The method comprises the following steps: 1) performing sterilizing treatment on the dewatered sludge for 3 hours under the condition of 121 DEG C; 2) mixing rice husk with the sludge obtained after the high-temperature treatment to obtain a mixture, and then adding a nutrient solution to obtain a mixed material; and 3) adding the sewage from an aeration tank of a municipal sewage plant to the mixed material, regulating the moisture content to 55%, turning over each day, supplementing a proper amount of water until the moisture content is kept within the range of 55-60%, and finishing decomposition 20 days later, thereby obtaining the organic fertilizer. The method has the advantages that the sludge is pretreated at a high temperature before composting so that the flocculent structure and cell membrane structure of the sludge can be broken, and therefore, the cytoplasm in sludge cells flow out to result in great increase in the content of easily degradable organic matters in the compost and to promote efficient fermentation of aerobic composting.

Description

technical field [0001] The invention relates to the field of organic fertilizer production, in particular to a method for producing organic fertilizer by using pretreated sludge. Background technique [0002] In recent years, with the development of society and the continuous improvement of people's living standards, urban sewage treatment plants have become more and more popular, and the amount of sludge produced has also increased. Therefore, its treatment and disposal has become an urgent problem to be solved. Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage and placement, it will turn into black sludge. This sludge has no high temperature period in the process of composting with chaff, and is always in a normal temperature st...

AI Technical Summary

Problems solved by technology

Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage and placement, it will turn into black sludge. This sludge has no high temperature period in the process of composting with chaff, and is always in a normal temperature state, and then cannot kill the pathogenic bacteria in the sludge, and the organic matter cannot be obtained. good humification

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