Abstract

An air-drying device for sludge comprises at least one section air-drying mechanism, a quantitative feeding mechanism and a dehumidifying and heating mechanism. The air-drying mechanism is provided with two sections. The quantitative feeding mechanism connects with the beginning end of the first section air-drying mechanism (5) whose terminal end communicates with the beginning end of the second section air-drying mechanism (8), and a discharge port (21) is arranged above the communicating position. The terminal end of the second air-drying mechanism communicates with the beginning end of the first air-drying mechanism thus forming a loop structure. The device has high efficiency and low energy consumption. The stay time of the sludge in the drying device is adjustable so that the water-content rate of the discharging material is adjustable.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening

Abstract

A method of integration of concentration-dehydration and aerobic air-drying of sewage sludge comprises the following steps: (a) conditioning by an organic agent (3); (b) gravitationally concentrating (5) the residual sludge conditioned by the organic agent; (c) conditioning by inorganic agents (7); (d) mechanically dehydrating (8); (e) crushing and dispersing (10); and (f) aerobically air-drying (11). The method has the following advantages: (i) to improve the sedimentation performance of the residual sludge, thus improving the concentration efficiency of sludge, reducing the concentrating time and reducing the volume of the concentrating pool; (ii) to reduce the volume of the dehydrated sludge correspondingly, thus reducing the succedent heat treatment load; (iii) to have low energy consumption for drying; (iv) the sludge granules moving at low speed during the drying process, thus being produced stably and securely without powder; (v) the dried exhaust air can reach environmental-friendly standard discharge after being washed by water; (vi) the output sludge granules are not compact, which is good for utilizing as the succedent resources.

IPC Classes  ?

• C02F 11/14 - Treatment of sludgeDevices therefor by de-watering, drying or thickening with addition of chemical agents
• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• A61L 2/10 - Ultraviolet radiation
• A61L 2/16 - Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lensesAccessories therefor using chemical substances

Abstract

A method for aerobically air-drying sludge filter cakes is provided. The method comprises: crushing and dispersing the sludge filter cakes into sludge granular layers; conveying dry air at certain temperature into the sludge granular layers moving at low speed or overturned with positive pressure; physically or chemically sterilizing the sludge granules moving at low speed or overturned; washing the tail gas pumped out by negative pressure and then discharging it; making the dried sludge granules further pulverized. At the same time, an apparatus for carrying out the method is also provided. The method is high in heat conducting and mass transferring efficiency when drying, and low in energy consumption for drying. It quickens the drying speed. The sludge granules can be stably and securely produced during the drying process. In addition, the dried tail gas can meet the environment-friendly discharge standard, and the output sludge is good for sludge reclamation.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• A61L 2/10 - Ultraviolet radiation
• A61L 2/20 - Gaseous substances, e.g. vapours
• A61L 2/18 - Liquid substances
• A61L 101/10 - Ozone
• A61L 101/06 - Inorganic materials containing halogen

Abstract

A method for drying sludge comprises the following steps: (a) drying the dewatered sludge to produce carrier (6) for drying sludge; (b) supplying the carrier (6) and the dewatered sludge to be dried (1) to a stirring and mixing apparatus (2) and mixing them; (c) supplying the mixed sludge (3) obtained in step (b) to a drying apparatus (4) and drying them; (d) repeating steps (b) and (c). Wherein, the amount of the sludge adopted from the mixed sludge (3) coming from the mixing apparatus (2) in step (d), which is to be dried in the drying apparatus (4), lies on the amount of the carrier (6) needed, and the rest of the mixed sludge (7) is discharged as the final product.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless

Abstract

A sludge concentrated dehydration method is provided, which comprises the following steps: (1) adding organic agent (polyacrylamide) to sludge for the first conditioning, then which is concentrated; (2) adding inorganic agent (iron and calcium compounds) to sludge treated by step (1) for the second conditioning, then which is fed to a dehydrator; (3) making a corresponding process for the dehydrated sludge when it satisfies the final requirements.

IPC Classes  ?

• C02F 11/14 - Treatment of sludgeDevices therefor by de-watering, drying or thickening with addition of chemical agents
• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening

Abstract

An antistatic bag dust collector, comprises a main body (1) and some antistatic filter bag groups (6, 7). A dust outlet (2) is located on the bottom of the main body (1). A gas inlet (3) is located on one side in the vicinity of the bottom of the main body (1). A gas outlet (4) is located on the top of the main body (1), and connected to an exhaust blower (5). Each filter bag group (6, 7) is composed of some filter bags (8). Some strip-shaped metal filaments (13) are disposed on the filter bag (8). The metal filaments (13) are connected to a metal wire grounded (14). A breather pipe connected with the gas outlet (4) of the main body (1) is located on one side of the top of the filter bag group (6, 7), and a scavenging port (9) is located on the other side.

IPC Classes  ?

• B01D 46/02 - Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• B01D 46/50 - Means for discharging electrostatic potential

Abstract

A dust collector includes a dust collector main case (1) and several de-dust filter bag groups(6,7). Each de-dust filter bag group has several filter bags (8) with a temperature sensor. The interlayer of the filter bag has electrically heated wires (13). The main case has a powder inlet (3) with a humidity sensor (14) and a temperature sensor (16). The main case has a current regulator (15) for adjusting current intensity in the electrically heated wires. By controlling the temperature of the filter bag, the condensation of wet and hot gas flow on the filter bag surface due to temperature difference can be prevented effectively. At the same time, a continuous de-dusting process can be realized.

IPC Classes  ?

• B01D 46/02 - Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• B01D 46/46 - Auxiliary equipment or operation thereof controlling filtration automatic

Abstract

A system for continuously treating sludge is provided, which successively comprises a storage tank (1), a modification pretreatment module (2), a mechanical dehydration module, a modification module using a powder, a drier module, a separation module and an operation control module. The mechanical dehydration module is composed of a high pressure pump and a plate and frame press. The sludge is fed to the plate and frame press by the high pressure pump. Dehydrating the sludge is realized under the mechanical pressure. The modification module using a powder is composed of a mixing vessel and a stirrer (4). The mechanically dehydrated sludge ismixed with the dried sludge from a cyclone separator (8) in the mixing vessel, then the sludge is fully mixed under the stirrer (4). A portion of the sludge modified by the modification module using a powder is fed to the drier module.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• C02F 11/00 - Treatment of sludgeDevices therefor
• C02F 11/14 - Treatment of sludgeDevices therefor by de-watering, drying or thickening with addition of chemical agents
• C02F 11/16 - Treatment of sludgeDevices therefor by de-watering, drying or thickening using drying or composting beds

Abstract

An integrated facility used for filter pressing, smashing and transporting wet mud is provided, which comprises a bracket (4), a plate and frame press (1,2), a sink (3), a mud pulverizator (5), and a convey belt (6). The plate and frame press (1,2), the sink (3), the mud pulverizator (5), and the convey belt (6) are installed on the bracket (4). The plate and frame press (1,2) is mounted on the upmost portion, and the sink (3) is under the plate and frame press (1,2). The mud pulverizator (5) is under the sink (3), and the convey belt (6) is installed under the mud pulverizator (5). The bottom of the sink (3) is provided with a water guide pipe, two ends of which are respectively provided with a slide bar groove (31) fixed on the bracket (4), and the sink (3) can slide in the slide bar groove (31). The facility has integrated the processes of dehydrating, smashing and transporting. So continuously and efficiently dehydrating wet mud is achieved, and continuously producing of a factory is also achieved.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• C02F 11/00 - Treatment of sludgeDevices therefor
• B01D 35/12 - Devices for taking out of action one or more units of multi-unit filters, e.g. for regeneration