CN1382652A

CN1382652A - Process for quickly and economically treating sludge

Info

Publication number: CN1382652A
Application number: CN 01115480
Authority: CN
Inventors: 韩洪波
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-27
Filing date: 2001-04-27
Publication date: 2002-12-04

Abstract

A high-speed cheap process for treating the mud generated by sewage treatment plant includes such steps as granulating, baking and burning to result in organic granular fertilizer.

Description

A kind of quick, economic sludge treatment technique

The invention belongs to field of solid waste treating technology, be applicable to the needs that different scales organic sludge treatment unit is built.

Mud follows the construction of sewage treatment plant to produce, and along with the continuous construction of sewage treatment plant, its quantity is also increasing rapidly; Owing to without comparison good method of disposal, mud is just seriously polluting environment, has become big public hazards.

The way of lignin-sludge mainly contains landfill method, burning method and composting process both at home and abroad at present.

The landfill method floor space is big, must do antiseepage and handle, and also will build methane recovery system and water from diffusion treatment plant, easily underground water and ambient air is polluted, and resource can not be recycled; For populous, China of cultivated land resource growing tension more and more is difficult to implement.

Burning method needs incinerator special, and investment is big, the operating cost height.

The composting process floor space is big, and the time is long, grows easily mosquitos and flies, distributes stench, is difficult to form large-scale production.

Purpose of the present invention be exactly to develop a kind of small investment, take up an area less, fast, economic sludge treatment technique.

Urban domestic sewage sludge is to be the organic sludge of main component with the organism, abbreviates mud as; Its main characteristic is the organic content height, and water ratio height (near 80%) is degenerated smellyly easily, and particle is thinner, and ventilation property is poor, and density is less, and is bulky, has colloid property; Also contain a large amount of pathogenic micro-organisms and parasitic ovum in the primary sludge, can spread disease.

Because mud has these characteristics, causes transportation, processing, utilization to it all to have very big difficulty.

Characteristics of the present invention are carried out earlier granulation (bar) to mud exactly, and then dry, burning; Existing sludge drying process is directly to send into the drying machine drying after mud is adjusted moisture, and its shortcoming is that mud is easily formed than large crumb in dry run, and the surface becomes stiff and inner and but changes not quite, makes drying efficiency not high; Also easily form than large crumb during sludge incineration, be difficult to grill thoroughly, cause air pollution.

Technology of the present invention is that the dewatered sludge of sewage treatment plant and part sludge-drying and a certain amount of inorganic fertilizer and auxiliary material (when with mud production composite fertilizer) behind the Mixed adjustment moisture content, are added in special screw rod (can be single screw rod or twin-screw) extruder grain (bar) machine (can be vertical or horizontal) in mixer continuously; When the mud of extruding not mutually during adhesion (moisture content is lower), can adopt screw extruder pelletizer, when the mutual adhesion of the mud of extruding (moisture content is higher), can adopt screw extruding strip making machine (only needing its outlet revolving scraper is unloaded); The outlet of screw extruding granulation (bar) machine directly links to each other with the entrance of revolving drum drier, the mud import of revolving drum drier is suitably increased, a part of high-temperature flue gas is imported wherein in the place near the outlet of screw extruding granulation (bar) machine, and with mud arranged certain time of contact in vertical direction; The outlet of screw extruding strip making machine is always downward; When the mud bar has just been extruded, namely contact with high-temperature flue gas, surface moisture evaporates rapidly, makes the no longer mutually adhesion of mud bar, is conducive to drying and dehydrating; After coming out from revolving drum drier, a part of dewatered sludge mixes with wet mud as returning charge, and another part dewatered sludge is sold as fuel or the as fertilizer sources of oven dry mud; Through super-dry, the mud odorless, tasteless that becomes, wherein pathogenic microorganism and parasitic ovum also are killed, and have realized innoxious.These processes just can be finished in a short period of time.

Advantage of the present invention is:

1. the mud specific area of granulation (bar) increases, and can improve drying efficiency.

2. the treatment time is short.

3. the wet mud of oven dry take dewatered sludge as fuel can be saved a large amount of fuel, reduces running cost.

4. high-temperature flue gas can be removed mud stink, non-secondary pollution.

5. mud can enter drying machine and not adhesion mutually with higher moisture.

6. granulation (bar) machine directly links to each other with drying machine can save conveying equipment.

Than granulation under the high-moisture (bar) but Reduction of power consumption and equipment attrition.

8. screw extruding granulation (bar) machine also plays the effect of mixing, fragmentation, even feeder and wind stopping device.

Accompanying drawing is the schema of this technology.

Claims

1. " a kind of quick, economic sludge treatment technique ", it is characterized in that: the dewatered sludge of sewage treatment plant and part sludge-drying and a certain amount of inorganic fertilizer and auxiliary material (when with mud production composite fertilizer) behind the Mixed adjustment moisture content, are added in special screw rod (can be single screw rod or twin-screw) extruder grain (bar) machine (can be vertical or horizontal) in mixer continuously; When the mud of extruding not mutually during adhesion (moisture content is lower), can adopt screw extruder pelletizer, when the mutual adhesion of the mud of extruding (moisture content is higher), can adopt screw extruding strip making machine (only needing that comminutor is exported revolving scraper unloads); The outlet of screw extruding granulation (bar) machine directly links to each other with the entrance of revolving drum drier, the mud import of revolving drum drier is suitably increased, a part of high-temperature flue gas is imported wherein in the place near the outlet of screw extruding granulation (bar) machine, and with mud arranged certain time of contact in vertical direction; The outlet of screw extruding strip making machine is always downward; When the mud bar has just been extruded, namely contact with high-temperature flue gas, surface moisture evaporates rapidly, makes the no longer mutually adhesion of mud bar, is conducive to drying and dehydrating; After coming out from revolving drum drier, a part of dewatered sludge mixes with wet mud as returning charge, and another part dewatered sludge is sold as fuel or the as fertilizer sources of oven dry mud; Through super-dry, the mud odorless, tasteless that becomes, wherein pathogenic microorganism and parasitic ovum also are killed, and have realized innoxious.These processes just can be finished in a short period of time.