New process for producing compound fertilizer by municipal sludge

A technology of municipal sludge and compound fertilizer, applied in the direction of sewage/sludge fertilizer, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of high production cost of compound fertilizer and unusable urban sludge, and achieve The effect of meeting agricultural needs, low production costs, and abundant sludge resources

Inactive Publication Date: 2009-09-09
张芝 +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new process of producing compound fertilizer by using urban sludge, so as to solve the problem that the existing urban sludge cannot be used, which has become a big public nuisance, and the production cost of compound fertilizer is high.

Method used

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  • New process for producing compound fertilizer by municipal sludge

Examples

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Embodiment 1

[0014] Example 1: 100 parts by weight of sludge, sludge components: organic matter 30-40%, total nitrogen 2-3.5%, total phosphorus 8-12%, total potassium 2.5-4%, inorganic matter 40.5-57.5%. 1-15 parts of additives, 4.5-8 parts of nitrogen, 0-12 parts of phosphorus, 2-11.5 parts of potassium, and 0-0.5 parts of trace elements.

[0015] The technological process is shown in Figure 1, including sludge, dehydration, drying, crushing, sieving, testing, additives, trace elements of nitrogen, phosphorus and potassium, mixing, fermentation, granulation, drying, and packaging.

[0016] Process description:

[0017] 1. Sludge: use domestic sewage treatment sludge from urban sewage treatment plants;

[0018] 2. Dehydration: dehydration by vacuum filtration or centrifugal separation;

[0019] 3. Drying: use a hot air drying furnace to dry, and the drying temperature is 200-450°C;

[0020] 4. Crushing: using a pulverizer;

[0021] 5. Sieving: pass through a 70-120 mesh sieve;

[0022...

Embodiment 2

[0030] 100 parts by weight of embodiment 2 sludge, its composition organic matter (dry basis) 35%, total nitrogen 2.2%, total phosphorus 11%, total potassium 3.6%, inorganic matter 47.6%, additive uses 2 parts of citric acid, if use 50% 8 parts of sulfuric acid, 5.8 parts of total nitrogen is equivalent to 10.5 parts of ammonium sulfate; 1 part of total phosphorus is equivalent to 4.06 parts of diammonium hydrogen phosphate; 4.4 parts of total potassium is equivalent to 3.51 parts of potassium sulfate.

[0031] The process flow and process description are the same as Example 1

[0032] The composition of the compound fertilizer: 8% of total nitrogen, 12% of total phosphorus, 8% of total potassium, and 30% of organic matter.

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Abstract

The invention belongs to a new process for producing a compound fertilizer by municipal sludge. The process is characterized in that the production process comprises procedures of obtaining sludge, dewatering, drying, crushing, screening, testing, adding additive, nitrogen, phosphorus, potassium, microelement, compounding, fermentation, granulating, drying and packaging, wherein, the screening is performed by a 70-120 meshes screen, the content of the additive added is 1-15% of the sludge by weight, nitrogen, phosphorus, potassium and microelements can be used as soluble raw materials. What is lacked is complemented according to a sludge test data to achieve standard content of the compound fertilizer product. The process is characterized by converting nitrogen, phosphorus, potassium nutrients which are not easily absorbed in the sludge by plants into absorbable quick-acting fertilizer by the additive and processing, consumption of the nitrogen, phosphorus, potassium, microelements is small, the cost is low, and the compound fertilizer has quick-acting property of chemical fertilizers and long-acting property of the organic fertilizers, and is applicable to agriculture popularization application.

Description

technical field [0001] The invention relates to a compound fertilizer production process, which is a new process for producing compound fertilizer by using urban sludge. Background technique [0002] Domestic sewage treatment plants in cities and towns across the country are generally established and put into operation one after another. However, how to deal with the sludge from the treatment plants has become a difficult problem. Farmers are allowed to take it away for free as fertilizer, but farmers don’t want it. Therefore, inorganic or organic matter remains in the sludge, which is insoluble in water and difficult to be absorbed by plants. Now it has to occupy an area for storage. The national sewage treatment plants produce about 8.64 million tons of sludge every year, which has become a major public nuisance. [0003] At present, most of the compound fertilizers are produced by mining nitrogen, phosphorus and potassium fertilizers and mixing them mechanically. The high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C02F11/00C05F7/00
CPCY02A40/20
Inventor 张芝王天伦
Owner 张芝
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