CN102515457A

CN102515457A - Rapid air-drying method of residual activated sludge

Info

Publication number: CN102515457A
Application number: CN2011104143212A
Authority: CN
Inventors: 张愿伟; 徐慧; 韩斯琴; 林阳; 刘国峰
Original assignee: Institute of Applied Ecology of CAS
Current assignee: Institute of Applied Ecology of CAS
Priority date: 2011-12-13
Filing date: 2011-12-13
Publication date: 2012-06-27

Abstract

The invention relates to the technical field of residual activated sludge minimization and specifically relates to a rapid drying method of residual activated sludge. The method provided by the invention comprises the following steps of: adding lime milk into collected residual activated sludge, making the residual activated sludge into a flowing slurry, allowing the slurry to stand overnight in a reaction tank, supplementing a loosener after water completely oozes from the residual activated sludge and parasite eggs inside the residual activated sludge, uniformly stirring the residual activated sludge to form koji shape, flatly spreading a thin layer of the residual activated sludge inside an air-drying box (chamber), stirring, ventilating, and continuously operating until the water content of the activated sludge is reduced to 30-40%. According to the invention, wind energy is fully utilized to replace heat energy to dry the activated sludge. The method provided by the invention has advantages of low energy consumption, high efficiency, less equipment investment and simple operation, and is suitable for large enterprises of large-scale intensive production.

Description

The quick air-dry method of residual active sludge

Technical field

The present invention relates to a kind of technical field of residual active sludge minimizing, be specially a kind of quick air-dry method of residual active sludge.

Technical background

Residual active sludge is one type of organism with height (crop/trees) nutrition and high burning-value, and it is big to put into practice utility value, but desires to make good use of, and need give abundant mummification.

The active sludge water cut that existing sewage work collects is high, is about 80-85%, and the tool highly variable can not directly be utilized, and needs mummification.Drying method commonly used comprises: 1) drying machine drying, and the mummification rapid speed, but it is excessive to consume energy, and understands extra-heavy viscosity and elasticity because of mud in the oven dry, and irregular to its mummification, not thorough; 2) heap dries in the air naturally; Make its spontaneous evaporation dry, but in the process too because of the tackiness of its extra-heavy, the surface is met wind and is promptly formed the solid duricrust of one deck; Blocking-up is inner to be exchanged with the steam of space outerpace; Can not get mummification for a long time to inside, and constantly to around distribute bad smell, regular meeting is restricted during application; 3) turnover throwing machine mummification, application specific equipment is kicked up mud, increases the interface of itself and air, accelerate scattering and disappearing of moisture, but the turnover throwing machine personal value is high excessively, and mummification intensity and speed also slightly are better than thin layer piles naturally and dries in the air, and does not far reach people's desirable demand.

Develop the difficult problem that a kind of novel mummification method of low, fireballing active sludge that consumes energy has become insider's common concern as early as possible.

Summary of the invention:

The quick air-dry method of a kind of residual active sludge that the object of the present invention is to provide a kind of less investment, power consumption is low, efficient is high, easy and simple to handle, suitable extensive intensification is produced.

For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:

A kind of quick air-dry method of residual active sludge is added milk of lime, but is made residual active sludge be modulated into the slurries of flowable state in the residual active sludge of collecting; Putting reaction tank spends the night; After treating that the interior intravital water of parasitic ovum of residual active sludge is fully oozed out, add raising agent residual active sludge is stirred into the distiller's yeast shape, then be tiled in the air-dry case (chamber) with thin layer; Stir and ventilation, the water cut of continuous service to active sludge is reduced to 30-40%.Said residual active sludge is the active sludge of 80-85% for water cut behind mechanical dehydration.With adding the residual active sludge that raising agent stirs into the distiller's yeast shape; For the 10-30cm thin layer is tiled in the air-dry case (chamber), case (chamber) two ends are set up blast orifice and air outlet separately with thickness, in the case end of apart from 5cm place pacify the screw thread agitator arm; Screw thread agitator arm diameter is 10-20cm; Distance between agitator arm (axle center spacing) is 20-50cm, and stirring velocity is 1-20 rev/min, and gas blower PM blast volume is 1-20 a times of air-dry case (chamber) volume.Saidly with milk of lime residual active sludge is modulated into pulpous state, lime milk concentration is 5-10% (volume ratio), and consumption is the 10-30% of active sludge weight.The quick air-dry of said residual active sludge carried out under normal temperature 8-72 hour.Said raising agent is peanut hull meal, powdered rice hulls, straw powder, sawdust or shinyleaf yellowhorn shell chip, and wherein above-mentioned each raising agent add-on is respectively 5-10%, 10-12%, 5-15%, 8-15%, the 10-30% of active sludge weight.

The present invention has following advantage:

1. the present invention realizes active sludge fast and harmless and dryingization, can be that the residual active sludge moisture content of 80-85% is reduced to 30-40%, weight contracts to 50-60% with water cut in the short period of time, for further utilizing and transporting, provides convenience.

2. the invention provides easy labour-saving (active dirty) mud, the even technology of mixing of (filling) material, fully enlarged the contact area between active sludge and air, mummification speed is improved significantly.

3. active sludge mummification of the present invention has replaced heat energy with wind energy, saves energy consumption, reduces CO ₂Discharging contributes for implementing the big political affairs of national energy-saving and emission-reduction.

4. the mummification goods of active sludge of the present invention can directly be used for agricultural ground base manure, also can directly be used as fuel.

5. less investment of the present invention, power consumption is low, efficient is high, easy and simple to handle, be suitable for the large enterprises that extensive intensification is produced.

Embodiment

Embodiment 1

With collecting through the mechanical dehydration water cut is that 82% active sludge 10kg places in the 25L bucket, adds 5% milk of lime 1.5L, but is modulated into the slurries of flowable state; Put reaction tank and leave standstill and spent the night in 24 hours, treat that the parasitic ovum in the residual active sludge is killed, after the water in the living microbe is fully oozed out; Add peanut hull meal 0.5kg, residual active sludge is stirred into the distiller's yeast shape, then be tiled in air-dry case bottom; Thickness 20cm, the case two ends are set up blast orifice and air outlet separately, in the case end of apart from 5cm place pacify the screw thread agitator arm; It is 15cm that screw thread stirs the bar blade diameter; The distance (axle center spacing) of stirring between bar is 20cm, and blast volume is the long-pending 2-3 of an air-dry casing times/PM, and stirring velocity is 2 rev/mins.Air-dry 48 hours, sludge moisture content 39%; 72 hours, sludge moisture content 31%.

Embodiment 2-5

V ^*: air-dry casing is long-pending

Application examples 1:

Get 3 parts of the air-dry active sludge of water cut 34%, mix calorific value respectively and be 6000 kilocalories fire coal 50%, 25% and 0.Gained mixture calorific value is respectively 4100,3200,2200 kilocalories.

Application examples 2:

Get water cut and be 35% air-dry active sludge; Press 3 times of 0,200,500,1000 kilograms of every mu of dry weights and each compatibility fine earths; Apply behind the mixing in the tomato experimental plot at soil table 10-15cm place, plant and cultivate 75 days, output contrasts respectively and improves 12.7%, 22.8%, 32.6%.

Claims

1. the quick air-dry method of a residual active sludge is characterized in that: in the residual active sludge of collecting, add milk of lime, but make residual active sludge be modulated into the slurries of flowable state; Putting reaction tank spends the night; After treating that the interior intravital water of parasitic ovum of residual active sludge is fully oozed out, add raising agent residual active sludge is stirred into the distiller's yeast shape, then be tiled in the air-dry case (chamber) with thin layer; Stir and ventilation, the water cut of continuous service to active sludge is reduced to 30-40%.

2. according to the quick air-dry method of the described residual active sludge of claim 1, it is characterized in that: said residual active sludge is the active sludge of 80-85% for water cut behind mechanical dehydration.

3. according to the quick air-dry method of the said residual active sludge of claim 1; It is characterized in that: will add the residual active sludge that raising agent stirs into the distiller's yeast shape; For the 10-30cm thin layer is tiled in the air-dry case (chamber), case (chamber) two ends are set up blast orifice and air outlet separately with thickness, in the case end of apart from 5cm place pacify the screw thread agitator arm; Screw thread agitator arm diameter is 10-20cm; Distance between agitator arm (axle center spacing) is 20-50cm, and stirring velocity is 1-20 rev/min, and gas blower PM blast volume is 1-20 a times of air-dry case (chamber) volume.

4. according to the quick air-dry method of the said residual active sludge of claim 1, it is characterized in that: saidly with milk of lime residual active sludge is modulated into pulpous state, lime milk concentration is 5-10% (volume ratio), and consumption is the 10-30% of active sludge weight.

5. according to the quick air-dry method of the said residual active sludge of claim 1, it is characterized in that: the quick air-dry of said residual active sludge carried out under normal temperature 8-72 hour.

6. according to the quick air-dry method of the said residual active sludge of claim 1; It is characterized in that: said raising agent is the one or more combination in peanut hull meal, powdered rice hulls, straw powder, sawdust, the shinyleaf yellowhorn shell chip, and consumption is the 5-30% of active sludge weight.

7. according to the quick air-dry method of the said residual active sludge of claim 6, it is characterized in that: the add-on of said above-mentioned each raising agent peanut hull meal, powdered rice hulls, straw powder, sawdust or shinyleaf yellowhorn shell chip is respectively 5-10%, 10-12%, 5-15%, 8-15%, the 10-30% of active sludge weight.