Method for preparing organic fertilizer by virtue of sludge

Abstract

The invention discloses a method for preparing an organic fertilizer by virtue of sludge. The method specifically comprises the following steps: preparing sewage sludge from municipal domestic sludge; heating the sewage sludge, and performing mechanical filtration and washing to obtain a sludge cake; adding cow dung, straw powder, Chinese wax gourd peel powder, sea asparagus powder and quicklime powder into the sludge cake to obtain a mixed material A; preparing a return product; performing fermentation; after-ripening a compost to obtain a powdery fermented material; adding weathered coal, urea, monoammonium phosphate, potassium sulfate, ferrous sulfate, magnesium sulfate, zinc sulfate, manganese sulfate and borax to obtain an organic fertilizer finished product. According to the method, environmental pollution is reduced, and energy resources are saved; beet pulp contains a large amount of water-soluble organic matters, and can be directly used for regulating a water-soluble carbon-nitrogen ratio, so that the fertilizer efficiency of a compost product is greatly improved, and the market competitiveness of the product is enhanced; the organic fertilizer contains multiple nutrient elements and active substances required by growth of crops, so that the fertilizer efficiency is persistent, the water retention, fertilizer retention and ventilation capability of soil can be enhanced, and the ecological environment of the soil can be improved.

Description

technical field [0001] The invention relates to the technical field of sludge utilization, in particular to a method for preparing organic fertilizer from sludge. Background technique [0002] As we all know, urban domestic sludge refers to the solid waste produced by the treatment of domestic sewage, with a moisture content of about 80%. Domestic sludge usually contains various microorganisms and flocs composed of organic and inorganic particles, and contains a large amount of toxic and harmful substances. Such as parasite eggs, pathogenic microorganisms, bacteria, synthetic organic matter and heavy metal ions, etc.; at the same time, the sludge also contains nitrogen, phosphorus, potassium required for plant growth and development, and various trace elements to maintain the normal growth and development of plants and can improve soil structure. of organic matter. At present, most of the sludge treatment methods in our country are incineration, drying or sanitary landfill....

AI Technical Summary

Problems solved by technology

At present, most of the sludge treatment methods in my country are incineration, drying or sanitary landfill. These are either too expensive to deal with, or cause pollution to the environment, which is not suitable for the current international development.

In recent years, some local governments and enterprises have built relatively high-end greenhouses and imported overturning machines for sludge treatment. These have resulted in high energy consumption, high cost and high cost, so that the produced fermented urban sludge has no market.