Dried organic sludge fertilizer and preparation method thereof

Abstract

The invention relates to the field of fertilizer and particularly relates to dried organic sludge fertilizer and a preparation method thereof. The dried organic sludge fertilizer is prepared from thefollowing raw materials in parts by weight: 100 parts of dried sludge, 2-10 parts of quick lime, 15-30 parts of auxiliaries, 2-10 parts of phosphoric acid, 1-5 parts of an active microbial agent and 10-20 parts of earthworm cast. The preparation method comprises the following steps: weighing the components in the raw material proportion; putting the dried sludge, quick lime and auxiliaries into akneading machine, performing uniform stirring, and performing aging; putting the aged mixture in a disk grain making machine, spraying phosphoric acid into the mixture in a granulating process, performing neutralizing, jetting a fermentation inoculant into the mixture, and keeping on granulating; and putting the granulated granules into a fermenting tank, performing aerobic fermentation for 15-30days, and uniformly stirring the granules with the earthworm cast to obtain the dried organic sludge fertilizer. According to the dried organic sludge fertilizer, a great number of organic matters, trace elements and the like contributing to plant growth can be generated through assistance of quick lime, auxiliaries and other additives by sufficiently utilizing massive nutrition contained in the sludge, and the activity and nutrition of organic fertilizer can be improved. Furthermore, the preparation method is simple, and materials are wide in sources and low in cost.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a dried sludge organic fertilizer and a preparation method thereof. Background technique [0002] With the continuous improvement of domestic sewage treatment rate and treatment degree in our country, the generated municipal sludge is also increasing year by year. Sludge has high moisture content and unstable properties, and its scientific treatment and disposal has become a public concern. The content of nitrogen and sulfur in municipal sludge is relatively high. Due to the influence of anaerobic microbial activities and ammonifying bacteria, reducing sulfide and ammonia are released into the atmosphere in the form of gas. Therefore, odor pollution is inevitable in the process of sludge production and transportation, making it one of the key issues in sludge stabilization treatment. [0003] At present, the commonly used sludge treatment methods include throwing into the sea, incine...

AI Technical Summary

Problems solved by technology

There are some shortcomings in these treatment and disposal measures: throwing into the sea will pollute the ocean and has been banned; the incineration method has large investment in equipment, high operating costs, and air pollution; sludge landfill takes up a lot of land, polluting the surrounding environment and The standards required to meet groundwater bodies are also constantly increasing; traditional sludge composting is polluted by heavy metals, refractory organic matter and pathogens, which affects its agricultural promotion, and it is difficult to realize the harmless, resourceful and commercial treatment of a large amount of sludge

For example, the Chinese invention patent with the publication number CN104446689A discloses a sludge fermented organic fertilizer and its production process. The organic fertilizer is obtained by mixing the sludge with plant straw and fermenting the bacteria, but the organic fertilizer prepared by this method still contains The presence of heavy metals, refractory organic matter, etc., has adverse effects on plant growth and soil

Images