Method for producing bio-organic fertilizer from municipal domestic sludge and special starter

Abstract

The invention discloses a method for making biological organic fertilizer by utilizing urban domestic sludge and special-purpose leaving agent of the method. The method comprises the following steps of: regulating the proportion of sludge and auxiliary materials, and adding high-temperature aerobic zymophyte I to an organic fertilizer fermentation tank for fermenting; turning the materials once when the material stack temperature is increased to about 50 DEG C; ventilating for two hours, and turning over the materials once every other day, controlling the temperature to 55 DEG C-65 DEG C, keeping for 3-4 days, killing a large number of pathogenic microorganisms and parasitic ovum in the sludge, continuously fermenting about 10 days in a fermentation tank until the sludge mixture is almost odorless and almost rotten; discharging the mixture out of the tank when the temperature is reduced to 40 DEG C for lower and the moisture is lowered to 40% or lower; adding fermented culture II for carrying out secondary fermentation after-ripening, and lowering the moisture content to 35% three days after carrying out the secondary fermentation; and finally, metering and storing the fermented materials which reach the requirements.

Description

technical field [0001] The invention relates to a preparation method of bio-organic fertilizer and a special fermenting agent thereof, in particular to a method for producing bio-organic fertilizer by treating municipal domestic sludge with a microbial agent and a fermenting agent thereof. Background technique [0002] Municipal sludge is the sludge left in the sewage treatment tank after the urban sewage is purified and discharged. Only a medium-sized city and a sewage treatment plant with a daily processing capacity of 100,000 tons can produce tens of thousands of tons of sludge every year. Sludge has a high water content, generally 80-96%, in the form of colloid, high viscosity and unpleasant smell; wet sludge also contains harmful bacteria such as pathogenic bacteria and parasite eggs, no matter whether it is digested or not, if it is not After further proper disposal, it will cause secondary pollution in many aspects such as environmental odor, germ diffusion, water pol...

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Problems solved by technology

However, it encroaches on the land seriously, and if the anti-seepage technology is not enough, it will lead to potential soil and groundwater pollution; the treatment method with incineration as the core is the most thorough treatment method, which can carbonize all organic matter and kill pathogens, which can minimize The volume of sludge, but its disadvantage is that the investment in treatment facilities is large, the treatment cost is high, and the incineration of organic matter will produce highly toxic substances such as dioxins; ocean dumping will pollute the ocean and pose a threat to marine ecosystems and human food chains. International conventions have clearly stated Prohibited; land use is the use of urban sludge treated by composting for agricultural use, which has the advantages of less investment, low energy consumption, and low operating costs, and the organic part can be converted into soil improver components, so sludge land use is considered to be A disposal method with the most development potential

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