Device for producing organic fertilizer by combined operation of anaerobic fermentation and medium-temperature oxidation

Abstract

The invention discloses a device for producing organic fertilizer by combined operation of anaerobic fermentation and medium-temperature oxidation. The device comprises a feeding unit, a pretreatmentunit, an anaerobic fermentation unit, a medium-temperature oxidation unit, a solid-liquid separation unit, a concentration unit, a tail gas treatment unit and a pipe connection unit. Types of materials that can be treated with the method comprise municipal solid waste, straw, garden waste, livestock manure, domestic sludge, brewery sludge, domestic sewage, papermaking black liquor and the like. The materials treated by the method are changed into organic fertilizer containing humic acid. The method and the device have the advantage that harmless and resource utilization efficiency of organic solid waste are greatly improved; the optimal process scheme is adopted, and the final discharge amount of industrial three wastes is far below national or industry standard requirements, so that the purposes of energy conservation, emission reduction and ecological cycle are achieved to the maximum extent.

Description

technical field [0001] The invention relates to an energy-saving and environment-friendly technology and device, in particular to a device for producing organic fertilizer by combined operation of anaerobic fermentation and mesophilic oxidation. Background technique [0002] With the continuous development of society, people pay more and more attention to the protection of the environment, prompting the organic solid waste treatment industry to pay more and more attention to the research and development of resource technology and the improvement of traditional technology. The urgent problem facing waste treatment enterprises, resource treatment has become the need of modern work and life. [0003] In the process of organic solid waste treatment, the use of anaerobic fermentation to produce biogas has become one of the mainstream methods. Generally, anaerobic fermentation can only remove 30% to 50% of the dry matter in the feed within two or three weeks, and there is still a...

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Problems solved by technology

[0008] ●The cost of equipment is high, the process conditions are demanding, and the selection of equipment materials is difficult;

[0009] ●The operation cost is high, and it cannot be popularized and applied;

[0010] ●The treated materials have low fertilizer efficiency and cannot be used as resources

[0011] The Chinese invention patent with the application number of 201710397483.7 discloses the "method for preparing organic fertilizer from straw fermented biogas residue". The biogas residue is soaked in an organic solvent and then aerobically fermented. This method has the following problems: after the biogas residue is separated, There is no harmless and resourceful disposal of the biogas slurry; the organic solvent soaked in the biogas residue is flammable, explosive, toxic and hazardous, and there are potential safety hazards during storage and use; the biogas residue uses the method of aerobic composting, so it occupies an Large area, low composting temperature, long composting time, difficult to effectively remove easily degradable organic matter in biogas residues

The Chinese invention patent with the application number 201510848543.3 discloses "new biogas slurry organic fertilizer and its preparation method". The new type of biogas slurry organic fertilizer is prepared by mixing biogas slurry with three-acid mixture, compound bacterial agent, and physical light conversion materials. This method has the following problems: only the finely filtered biogas slurry is used, that is, the filtered biogas residue is not treated in a harmless and resourceful manner; the sterilizers used are ultraviolet rays and ozone, and ultraviolet rays have no continuous sterilization ability and sterilization effect Affected by the turbidity of biogas slurry and the disadvantages of easy fouling of UV lamp sleeves, ozone is a toxic and harmful substance, and large-scale use has the disadvantages of high manufacturing costs and high use requirements

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