CN102584463A

CN102584463A - Process for producing composite fertilizers through using industrial and municipal sludge

Info

Publication number: CN102584463A
Application number: CN2012100538532A
Authority: CN
Inventors: 吴锡平; 毛亦佳; 曾郴林
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-05
Filing date: 2012-03-05
Publication date: 2012-07-18

Abstract

The invention discloses a process for producing composite fertilizers through using industrial and municipal sludge. The process comprises the following steps: concentrating the sludge, carrying out sludge-water separation, concentrating to dehydrate, drying, sterilizing at 80-90DEG C, adding additives according to requirements of different soil conditions and different crop conditions under stirring and mixing, pelletizing, and drying to produce the composite fertilizers through directly using the industrial and municipal sludge. The composite fertilizers are suitable for various soils. The process of the invention has the advantages of simple flow, realization of the energy recycle in the drying procedure, realization of the production of various composite fertilizers through adding different additives according to different requirements, and wide application range of the sludge.

Description

Technology with industry, municipal sludge production composite fertilizer

Technical field

The invention belongs to the industry in environmental protection field, the processing of municipal sludge, specifically be meant technology with industry, municipal sludge production composite fertilizer.

Background technology

The normal operation of municipal sewage plant; Be the important behave of protection water resources and control water pollution, along with the economic society develop rapidly, living standards of the people improve rapidly; The output of municipal sludge also increases thereupon fast, and European Union's sludge yield was about 8 * 10 in 1998 ⁶T/a (dry weight), sludge yield increase by 55%, some member states even increase by 500%, and along with quickening of urbanization process, the quantity of Chinese city sewage sludge is also in rapid increase, and the dried dirty amount of the annual discharging of China at present is about 5 * 10 ⁶T/a (the muddy water sludge quantity that does not also comprise industrial enterprise) and constantly increase; A large amount of mud is not because of there being the stable outlet of reasonably handling; Occupy the original just nervous living space of people; Cause secondary sludge, so the mud problem caused the great attention of countries in the world government, sludge treatment also becomes the problem that experts and scholars pay close attention to utilizing Study on Technology.

Do not see the comparatively sophisticated treatment process of technology at present as yet.

Summary of the invention

The object of the present invention is to provide a kind of technology with industry, municipal sludge production composite fertilizer.

Present method comprises the steps:

1, concentrate: the water ratio that industry, municipal wastewater factory discharge is in the gravity flow of 80-85% mud or with the muddy water collection storage of lift technique with 2000mg/1-50000mg/l concentration;

2, separate: the muddy water that will collect storage rises to Cyclonic reactor with the screw rod sludge pump and carries out mud-water separation;

3, thickening: carry out thickening in the thickening machine;

4, drying: through 40% mud of the water ratio after the thickening, further drying treatment, dry with steam, hot water or thermal oil carry out heat drying with the mode of conduction heating to mud as heating medium;

5, sterilization: under 80-90 ℃ temperature; The bacterium glue that contains in industry, the municipal sludge is stranded bacterium and real silk fungi, moves the moving glue bacterium of living skill, bacillus cereus that glue belongs to; Flavobacterium, unwrapping wire shape Nocardia bacteria, middle Escherichia alcohol field bacterium and protozoon sterilization;

6, additive mixes: dried water cut 20% mud, according to the different soils condition, the different crops conditional request mixes when adding additive.

7, system particle: particulate state is processed at water ratio about 20% by the composite fertilizer after the stirring;

8, oven dry: contain the compound fertilizer granules oven dry of 20% water ratio, heat energy is directly used the heat energy of drying treatment, stirs particle removal moisture content.

Technological process of the present invention is simple, in oven dry and dry run, realizes the recycling of energy, based on different requirement, through adding the production that different interpolations can realize multiple composite fertilizer, to the wide accommodation of mud.

Description of drawings:

Fig. 1 is a concrete process flow sheet of the present invention.

According to commercial run of the present invention

3, thickening: carry out thickening in the thickening machine;

Concrete actually operating is following:

Industry or municipal sludge through gravity flow or lifting gear get into concentration basin 1, reach collect and store purpose adopt screw rod sludge pump 2, through dish type coiled pipe 3, get into Cyclonic reactor 4, before getting into Cyclonic reactor before the screw rod sludge pump; Add flocculation medicament 12, medicament reaches medicament with screw rod sludge pump wheel rotation (negative pressure) and mixes with muddy water, mix back muddy water and before flowing into the dish type coiled pipe, add after the entering sinuous coil reached about one fen kind of stop after coagulant aids 13, two kind of different medicament adding after through the pump front pump mixed with muddy water through sinuous coil length.Sinuous coil water outlet tangent line gets into the floc sludge that forms in Cyclonic reactor 4, the Cyclonic reactor and precipitates rapidly; Supernatant water comes back to the mud of the sedimentary mud of adjusting after flowing into thickening integral machine 5, thickening of sewage plant, falls into mixing and blending machine automatically through transfer roller entering drying 6, dried mud; 7, get into again in the cavity system granulator 8, then get into compound fertilizer granules after dryer 9 oven dry get into through conveying belt have metering bunker 10, through the compound fertilizer granules after the metering, get into sacker 11, seal up check automatically and dispatch from the factory.

The process object of actual selection is seven li rivers, Lanzhou, peaceful sewage plant sludge.

The concrete composition of mud is seen table 1 and table 2.

Seven li rivers of table one peaceful sewage plant sludge nutrient composition content gkg ^-1DW

Organic	Full nitrogen	Quick-acting nitrogen	Full phosphorus	Rapid available phosphorus	Full potassium	Available potassium
							516.53	26.17	1.71	5.53	1.41	78.32	63.57

Seven li rivers of table two peaceful sewage plant sludge heavy metal content gkg ^-1DW

Cu	Zn	Pb	Cr	B	As
						110.21	207.12	191.20	10.26	42.17	35.67

The result shows that the potential of hydrogen of all mud is meta-alkalescence (PH=8.68-8.9)

Organic in the mud, ammonia phosphorus potassium content enriches; The content of heavy metal and B is lower in the mud.

There are not plain and the analysis of GB1506-94 GB through various content to the mud analysis.

In the course of processing, add additives such as trade waste flyash and N, P, K and process the particulate state compoiste fertilizer.

Flyash contains the element of the trace of multiple favourable plant production, and being has stronger hydration activity, can promote the fermentation and the characteristic of improving the soil, and the more important thing is that it has slow releasing function to the chemical fertilizer of using in the farmland.

Its final product can be according to the different soils condition, and the pH value through Wingdale adjusting soil satisfies the requirement of different crops to edaphic condition.

Can also be in the practice through regulating the kind and the consumption of additive.Produce multiple composite fertilizer, make the requirement of its different production phases of utilization different crops.

Claims

One kind with industry, municipal sludge production composite fertilizer technology, it is characterized in that may further comprise the steps:

1), concentrate: the water ratio that industry, municipal wastewater factory discharge is in the gravity flow of 80-85% mud or with the muddy water collection storage of lift technique with 2000mg/1-50000mg/l concentration;

2), separate: the muddy water that will collect storage rises to Cyclonic reactor with the screw rod sludge pump and carries out mud-water separation;

3), thickening: carry out thickening in the thickening machine;

4), drying: through 40% mud of the water ratio after the thickening, further drying treatment, dry with steam, hot water or thermal oil carry out heat drying with the mode of conduction heating to mud as heating medium;

5), sterilization: under 80-90 ℃ temperature; The bacterium glue that contains in industry, the municipal sludge is stranded bacterium and real silk fungi, moves the moving glue bacterium of living skill, bacillus cereus that glue belongs to; Flavobacterium, unwrapping wire shape Nocardia bacteria, middle Escherichia alcohol field bacterium and protozoon sterilization;

6), additive mixes: dried water cut 20% mud, according to the different soils condition, the different crops conditional request mixes when adding additive.

7), system particle: particulate state is processed at water ratio about 20% by the composite fertilizer after the stirring;

8), oven dry: contain the compound fertilizer granules oven dry of 20% water ratio, heat energy is directly used the heat energy of drying treatment, stirs particle removal moisture content.