CN101525257A

CN101525257A - New process for producing compound fertilizer by municipal sludge

Info

Publication number: CN101525257A
Application number: CN200910136118A
Authority: CN
Inventors: 张芝; 王天伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-30
Filing date: 2009-04-30
Publication date: 2009-09-09

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

Utilize municipal sludge production composite fertilizer novel process

Technical field

The present invention relates to compound fertilizer production technology, is a kind of municipal sludge production composite fertilizer novel process of utilizing.

Background technology

Whole nation town domestic sewage treatment plant generally sets up, and goes into operation successively, still, how the mud of treatment plant has been processed into a difficult problem, freely allow the peasant pull away and make fertilizer, the peasant not, reason is that to contain total nutritive ingredient in the mud many, but all be to stay in the mud with inorganics or organism, water insoluble, be difficult for have to being taken up an area of now and depositing by plant absorbing, annual about 8,640,000 tons of the mud that produces of whole nation sewage work has become big public hazards.

Composite fertilizer's production major part all is to have adopted n p k fertilizer at present, and machinery is mixed and forms, 2200 yuan/ton of the high prices of its cost.

Summary of the invention

The purpose of this invention is to provide a kind of municipal sludge production composite fertilizer novel process of utilizing, can't utilize, become big public hazards to solve existing municipal sludge, and the high problem of composite fertilizer's production cost.

The object of the present invention is achieved like this, this technology comprises: mud, dehydration, oven dry, pulverize, sieve, chemical examination, additive, nitrogen phosphorus potassium, trace element, be mixed, fermentation, granulation, oven dry, packaging process, the 70-120 mesh sieve sieves, additive is pressed the 1-15% of mud weight, and nitrogen phosphorus potassium, trace element adopt the solubility raw material, in line with lacking, what what is mended, what lack, what are mended, to reach composite fertilizer's standard content requirement.

Additive adopts citric acid, ammonium citrate or sulfuric acid wherein at least a.

The raw material of nitrogenous element adopts ammonium sulfate, ammonium nitrate or urea.

The raw material of phosphorus element-containing adopts Secondary ammonium phosphate, ammonium phosphate or primary ammonium phosphate.

The raw material that contains potassium element adopts vitriolate of tartar.

The raw material that contains trace element adopts borax, copper sulfate, zinc sulfate and ammonium molybdate.

Composite fertilizer's composition: full nitrogen 8-10%, full phosphorus 8-14%, full potassium 6-14%, organic 30-40%, PH=5.5-7.

This invention compared with prior art has the following advantages: (1) utilizes municipal sludge production composite fertilizer, turns harm into good, and turns waste into wealth, and has not only satisfied agricultural demand but also solved the unserviceable difficult problem of municipal sludge; (2) sludge resource is abundant, and is renewable, inexhaustible; (3) mud can make in the mud by additive and processes, is difficult for can being converted into by the nitrogen phosphorus potassium of plant absorbing the quick-acting fertilizer of easy absorption, and nitrogen phosphorus potassium allotment consumption is few, and production cost is low, about 1200 yuan per ton; (4) this composite fertilizer not only has the quick-acting of chemical fertilizer but also has the long-lasting of fertilizer, is that a kind of quick-acting long-acting mixing is fertile.

Description of drawings

Fig. 1: utilize municipal sludge to produce the compound fertilizer technology schema.

Embodiment:

Embodiment 1: mud 100 weight parts, sludge components: organic 30-40%, full nitrogen 2-3.5%, full phosphorus 8-12%, full potassium 2.5-4%, inorganics 40.5-57.5%.Additive 1-15 part, nitrogen 4.5-8 part, phosphorus 0-12 part, potassium 2-11.5 part, micro-0-0.5 part.

Technical process such as Fig. 1, comprise mud, dehydration, oven dry, pulverize, sieve, chemical examination, additive, nitrogen phosphorus potassium trace do not have plain, be mixed, fermentation, granulation, oven dry, packaging process.

Specification:

1, mud: the sanitary sewage disposal mud that adopts the municipal sewage plant;

2, dehydration: adopt vacuum filtration or centrifugal dewatering;

3, oven dry: adopt the oven dry of hot-air seasoning stove, bake out temperature is 200-450 ℃;

4, pulverize: adopt pulverizer;

5, sieve: cross the 70-120 mesh sieve;

6, chemical examination: five point sampling sample examinations routinely;

7, additive: adopt citric acid, ammonium citrate or sulfuric acid, additive according to insoluble in the mud and solubility in citric acid material what, and quantity is added in decision;

8, nitrogen phosphorus potassium, trace element: nitrogenous element raw material adopts ammonium sulfate, ammonium nitrate or urea; The raw material of phosphorus element-containing adopts Secondary ammonium phosphate, ammonium phosphate or primary ammonium phosphate; Contain the potassium element raw material and adopt vitriolate of tartar; The raw material of trace element adopts borax, copper sulfate, zinc sulfate or ammonium molybdate.According to the mud result of laboratory test, what lacks what is mended, what lack what are mended, to reach composite fertilizer's standard content requirement;

9, be mixed: nitrogen phosphorus potassium, trace element, drop into together in the stirrer by mud weight proportion and mud, additive citric acid or ammonium citrate dilute with 5-8 times of water, spray is 20-70% if use sulfuric acid, concentration while stirring, spray while stirring, till stirring;

10, fermentation: adopt the fermentation vat heap fermentation, time 90-120 hour;

11, granulation: adopt conventional agglomeration technique granulation;

12, oven dry: adopt the oven dry of hot-air seasoning stove, temperature is 200-450 ℃;

13, packing adopts packed:

Embodiment 2 mud 100 weight parts, its composition organic matter (butt) 35%, full nitrogen 2.2%, full phosphorus 11%, full potassium 3.6%, inorganics 47.6%, additive are with 2 parts of citric acids, if with 50% sulfuric acid want 8 parts, nitrogen is amounted to 10.5 parts in ammonium sulfate for 5.8 parts entirely; Full phosphorus is amounted to 4.06 parts of Secondary ammonium phosphates for 1 part; Full potassium is amounted to 3.51 parts of vitriolate of tartar for 4.4 parts.

Technical process and specification are with example 1

This composite fertilizer's composition: full nitrogen 8%, full phosphorus 12%, full potassium 8%, organic 30%.

Claims

1, a kind of municipal sludge production composite fertilizer novel process of utilizing is characterized in that: its technical process comprises mud, dehydration, oven dry, pulverizes, sieves, chemical examination, additive, nitrogen phosphorus potassium, trace element, be mixed, fermentation, granulation, oven dry, packaging process; The 70-120 mesh sieve that sieves, additive is pressed the 1-15% of mud weight, and what nitrogen phosphorus potassium, trace element solubility raw material mend in line with what lacks, and what lacks how much mend, to reach composite fertilizer's standard content requirement.

2, the municipal sludge production composite fertilizer novel process of utilizing according to claim 1 is characterized in that: additive adopts citric acid, ammonium citrate or sulfuric acid wherein at least a.

3, the municipal sludge production composite fertilizer novel process of utilizing according to claim 1 is characterized in that: the raw material of nitrogenous element adopts ammonium sulfate, ammonium nitrate or urea.

4, the municipal sludge production composite fertilizer novel process of utilizing according to claim 1 is characterized in that: the raw material of phosphorus element-containing adopts Secondary ammonium phosphate, ammonium phosphate or primary ammonium phosphate.

5, the municipal sludge production composite fertilizer novel process of utilizing according to claim 1 is characterized in that: the raw material that contains potassium element adopts vitriolate of tartar.

6, the municipal sludge production composite fertilizer novel process of utilizing according to claim 1 is characterized in that: trace element adopts borax, copper sulfate, zinc sulfate and ammonium molybdate.