{"id":1899,"date":"2024-12-23T10:22:39","date_gmt":"2024-12-23T10:22:39","guid":{"rendered":"https:\/\/ecomacchine.it\/?post_type=production&p=1899"},"modified":"2026-10-09T12:21:40","modified_gmt":"2026-10-09T12:21:40","slug":"chiarificatori-e-ispessitori-circolari","status":"publish","type":"production","link":"https:\/\/ecomacchine.it\/en\/production\/chiarificatori-e-ispessitori-circolari\/","title":{"rendered":"Circular clarifiers"},"content":{"rendered":"

They play a crucial role in wastewater treatment. These devices are designed to reduce sludge volume<\/strong> by concentrating its solid fraction and decreasing its water content, thereby improving the efficiency<\/strong> of subsequent treatment stages and reducing operating and disposal costs<\/strong>.<\/p>\n

Thickeners can be of different types, such as gravity or mechanical, each with specific characteristics to suit different plant requirements.<\/p>\n","protected":false},"featured_media":1911,"template":"","class_list":["post-1899","production","type-production","status-publish","has-post-thumbnail","hentry"],"translation":{"provider":"WPGlobus","version":"2.10.10","language":"en","enabled_languages":["it","en"],"languages":{"it":{"title":true,"content":false,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false}}},"acf":{"applications_and_models":{"items":[{"title":"Application","select":"Acordion","acordion":"\r\n

Municipal water and wastewater sedimentation and thickening<\/p>\r\n

Industrial water and wastewater sedimentation and thickening<\/p>\r\n","complex":null},{"title":"Peripheral drive scraping and suction type clarifiers and thickeners","select":"Complex","acordion":"","complex":[{"dimensions":null,"models":[{"image":1909,"label":"Double peripheral drive thickener","value":"EM10C","models_popup":""},{"image":1919,"label":"Peripheral drive clarifier","value":"EM17","models_popup":"\r\n\r\n

\r\n

EM17 - PERIPHERAL DRIVE SCRAPER BRIDGE FOR CIRCULAR TANK<\/h2>\r\n<\/div>\r\n
\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Application<\/td>\r\nClarifying of primary and secondary waste water<\/td>\r\n<\/tr>\r\n
Machine types<\/td>\r\nSimple peripheral drive R+1\/3 peripheral drive Double peripheral drive<\/td>\r\n<\/tr>\r\n
Characteristics<\/td>\r\nThe equipment consists of a diffusion drum and rotating bridge which draws the scrapers.<\/td>\r\n<\/tr>\r\n
Operation<\/td>\r\nThe water to be treated flows into the diffusion drum where the kinetic energy is slowed down, the sedimentable solids settle on the tank bottom and are conveyed towards to central drain well by the bottom scrapers.<\/td>\r\n<\/tr>\r\n
Materials<\/td>\r\nHot dip galvanized carbon steel or Stainless steel<\/td>\r\n<\/tr>\r\n
Installation<\/td>\r\nIn a concrete tank<\/td>\r\n<\/tr>\r\n
Tank diametre<\/td>\r\nFrom 8 to 60 m.<\/td>\r\n<\/tr>\r\n
Optionals<\/td>\r\nScum removal system<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n
\r\n
\r\n

<\/h3>\r\n

PRINCIPLES OF SIZING<\/h6>\r\nHydraulic sizing (process)<\/strong> The sizing of the diffusion drum is based on the following parametres: \u2022 influent flow rate \u2022 piping diametre The water coming out of the diffusion drum to the sedimentation zone must have a very low kinetic energy in order to guarantee a good separation and settling of the solids. Moreover, the bottom scrapers must have a continuous and logarythmic profile in order to successfully convey the sludge into the central well in less than a complete rotation of the shaft, 270\u00b0 (\u00be). \r\n\r\n \r\n\r\nMechanical Sizing<\/strong> The sizing of the bottom scraper is based on the type of sludge to be evacuated from the tank bottom. The central column, the trolleys and the scrapers are designed to bear a stress of 20 Kg. per linear metre. The torque to transmit is calculated by: T [kgm] = r\u00b2 x K r is the tank radius K is the load on the scrapers per linear metre (20 kg for biological clarifiers) The trolleys drive unit shall be capable of transmitting a 1.8 higher torque than the design value.\r\n\r\n \r\n\r\nTorque limiting device (dynamometric cell)\u00a0<\/strong> The dynamometric cell measures the torque transmited by the drive unit. This value is evident directly on the instrument and allows to evaluate the stresses on the gearbox during rotation. The device is equipped with limit switches set at two different torque values, one for alarm and one for the machine shutdown.\r\n\r\n \r\n\r\nSelection of the electric motor<\/strong> The electric motor size is selected so that, in case of shutdown, its static torque is lower than the one which can be borne by each downstream unit. For this reason the electric motor is usually very small. Exuberant motors may cause, in case of shutdown, serious damages to the structures if the torque limiting device fails to intervene or if it is not properly connected.\r\n\r\n \r\n\r\nExample of calculation:\u00a0<\/strong> Tank diametre 20 m. K = 20 Scrapers peripheral speed 1,5 m\/min Slow shaft rpm 0,047 Torque r\u00b2 x K = 10\u00b2 x 20 = 2000 kgm (in case of radial scrapers, the torque is halved) so the drive unit shall be designed to transmit a 1.8 higher torque\r\n\r\n \r\n\r\nElectric motor<\/strong> To transmit a torque of 1000 kgm, the thrust of each trolley must be 1000 : 5 = 200 kg. If the wheel diameter is 300 mm., then the torque on the shaft is 200 x 0.15 (wheel radius) = 30 kgm. Therefore, at a speed of about 1.5 rpm, 62 watt are necessary. If we hypothize a drive unit output of 60%, the electric motor shall have a power of 113 watt. Normally it is difficult to find electric motors which are smaller than 0,18 kw - 180 watt. If the selected motor has got a power of 180 watt, in case of shutdown it might give a 2.6 times higher power for a few seconds, i.e. 468 watt. The torque transmitted by the motor to the wheel slow shaft, with a drive unit (on the trolleys) output of 60%, would be equal to 48 kgm., the thrust of the trolley would be 320 kg. and the torque 3200 kgm. for each trolley (total 3200 kgm.) Therefore the central column must be designed to bear a torsion stress (in case of shutdown) of 3200 kgm.\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n<\/div>\r\n<\/div>\r\n\r\n"},{"image":1915,"label":"Peripheral drive clarifier","value":"EM29C","models_popup":"\r\n\r\n
\r\n

EM29 - PERIPHERAL DRIVE \u2013 SUCTION TYPE SCRAPER BRIDGE FOR CIRCULAR TANK<\/h2>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Application<\/td>\r\nClarifying of secondary waste water<\/td>\r\n<\/tr>\r\n
Types<\/td>\r\nSimple peripheral drive R+1\/3 peripheral drive Double peripheral drive<\/td>\r\n<\/tr>\r\n
Characteristics<\/td>\r\nThe equipment consists of a rotating bridge with scrapers equipped with suction pipes.<\/td>\r\n<\/tr>\r\n
Operation<\/td>\r\nThe water to be treated flows into the diffusion drum where the kinetic energy is slowed down, the sedimentable solids settle on the tank bottom and are sucked by the suction pipes equipped with regulating telescopic valves.<\/td>\r\n<\/tr>\r\n
Materials<\/td>\r\nHot dip galvanized carbon steel or Stainless steel<\/td>\r\n<\/tr>\r\n
Installation<\/td>\r\nIn a concrete tank<\/td>\r\n<\/tr>\r\n
Tank diametre<\/td>\r\nFrom 8 to 60 m.<\/td>\r\n<\/tr>\r\n
Optionals<\/td>\r\nScum removal system<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

<\/h3>\r\n

PRINCIPLES OF SIZING<\/h6>\r\nSludge suction unit sizing. For the project of the sludge suction unit we have to make sure that the sludge is quickly removed from the tank bottom because if it tends to settle or get too thick for staying in the tank for a too long time, it may happen that: \u2022 a part of the recycled sludge returns to the oxidation tank when it is no more fresh and this will affect the treatment efficiency \u2022 a shortage of dissolved oxygen may cause a leakage of sludge in the effluent\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\nMechanical Sizing Same principles as described for the Peripheral drive scraper bridge mod. EM17.\r\n

<\/h3>\r\n

OPERATION DESCRIPTION<\/h6>\r\nThe bottom of the suction scraper bridge tank is flat and the suction pipes, sized according to sludge recycle flow rate, are placed at a distance which does not exceed 3 m. The sludge is conveyed towards the suction pipe by V-shaped scrapers which make the flowing of the sludge towards the piping much easier. Each suction pipe is equipped with a telescopic valve to regulate the flow into the hopper. The quality and quantity of sludge sucked by each pipe can be checked from the bridge. The sludge flows into the hopper according to the principle of the communicating vessels. The sludge flow rate depends on the difference of level between the water surface and the sludge level in the hopper. The sludge sucked by all of the suction pipes is conveyed out of the tank by means of a self-regulating siphon. The triggering of the siphon can be made during the commissioning phase by means of a pump or ejector.\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n
TECHNICAL AND DIMENSIONAL DATA NECESSARY TO MAKE A TECHNICAL PROPOSAL AND QUOTATION<\/h6>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
1.<\/td>\r\nFlow rate to the sedimentation tank (total)<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
2.<\/td>\r\nFlow rate coming from the sedimentation tank (at the overflow weir)<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
3.<\/td>\r\nFlow rate of sludge coming from the sedimentation tank<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
4.<\/td>\r\nTank diameter<\/td>\r\n: m.<\/td>\r\n<\/tr>\r\n
5.<\/td>\r\nDiameter of the feed pipe<\/td>\r\n: mm.<\/td>\r\n<\/tr>\r\n
6.<\/td>\r\nSludge level in the drain well<\/td>\r\n: +m.<\/td>\r\n<\/tr>\r\n
7.<\/td>\r\nWater level in the sedimentation tank<\/td>\r\n: +m.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n"}]}]},{"title":"Central drive scraping and suction type clarifiers and thickeners","select":"Complex","acordion":"","complex":[{"dimensions":null,"models":[{"image":1910,"label":"Central drive scraping thickener","value":"EM10D ","models_popup":""},{"image":"","label":"Central drive scraping clarifier","value":"EM16","models_popup":"\r\n
\r\n

EM16 - CENTRAL DRIVE SCRAPER BRIDGE FOR CIRCULAR TANK<\/h2>\r\n<\/div>\r\n
\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Application<\/td>\r\nClarifying of primary and secondary waste water.<\/td>\r\n<\/tr>\r\n
Characteristics<\/td>\r\nThe equipment consists of a drive unit, a slow central shaft, two scraper arms, a diffusion drum.<\/td>\r\n<\/tr>\r\n
Operation<\/td>\r\nThe water to be treated flows into the diffusion drum where the kinetic energy is slowed down, the sedimentable solids settle on the tank bottom and are conveyed towards to central drain well by the bottom scrapers.<\/td>\r\n<\/tr>\r\n
Materials<\/td>\r\nHot dip galvanized carbon steel or Stainless steel.<\/td>\r\n<\/tr>\r\n
Installation<\/td>\r\nIn a concrete tank.<\/td>\r\n<\/tr>\r\n
Tank diametre<\/td>\r\nFrom 2 to 30 m.<\/td>\r\n<\/tr>\r\n
Optionals<\/td>\r\nScum removal system<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n
\r\n
\r\n

<\/h3>\r\n

PRINCIPLES OF SIZING<\/h6>\r\nHydraulic sizing (process)<\/strong> The sizing of the diffusion drum is based on the following parametres: \u2022 influent flow rate \u2022 piping diametre The water coming out of the diffusion drum to the sedimentation zone must have a very low kinetic energy in order to guarantee a good separation and settling of the solids. Moreover, the bottom scrapers must have a continuous and logarythmic profile in order to successfully convey the sludge into the central well in less than a complete rotation of the shaft, 270\u00b0 (\u00be). \r\n\r\n \r\n\r\nMechanical Sizing<\/strong> The sizing of the bottom scraper is based on the type of sludge to be evacuated from the tank bottom. Normally the central shaft and the scrapers are designed to bear a stress of 20 Kg. per linear metre. The torque to transmit is calculated by: T [kgm] = r\u00b2 x K r is the tank radius K is the load on the scrapers per linear metre (20 kg for biological clarifiers) For a reliability purpose, the drive unit shall be capable of transmitting a 1.8 higher torque than the design value.\r\n\r\n \r\n\r\nTorque limiting device (dynamometric cell)\u00a0<\/strong> The dynamometric cell measures the torque transmitted by the drive unit. This value is evident directly on the instrument and allows to evaluate the stresses on the central shaft during its rotation. The device is equipped with limit switches set at two different torque values, one for alarm and one for the machine shutdown.\r\n\r\n \r\n\r\nSelection of the electric motor<\/strong> The electric motor size is selected so that, in case of shutdown, its static torque is lower than the one which can be borne by each downstream unit. For this reason the electric motor is usually very small. Exuberant motors may cause, in case of shutdown, serious damages to the structures if the torque limiting device fails to intervene or if it is not properly connected.\r\n\r\n \r\n\r\nExample of calculation<\/strong> Tank diametre 10 m. K = 20 Scrapers peripheral speed 1,5 m\/min Slow shaft rpm 0,047 Torque r\u00b2 x K = 5\u00b2 x 20 = 500 kgm so the drive unit shall be designed to transmit a 1.8 higher torque.\r\n\r\n \r\n\r\nElectric Motor<\/strong>\r\n\r\nTo transmit a torque of 500 kgm at 0.047 rpm, 25 watt are necessary. If we hypothize a drive unit output of 60%, the electric motor shall have a power of 40 watt. Normally it is difficult to find electric motors which are smaller than 0,18 kw - 180 watt. If the selected motor has got a power of 180 watt, in case of shutdown it might give a 2.6 times higher power for a few seconds, i.e. 468 watt. The torque transmitted by the motor to the slow shaft, with a drive unit output of 60%, would be equal to 5700 kgm. In this case it should be evaluated whether to install a shear pin or a dynamometric cell to limit the torque.\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n<\/div>\r\n<\/div>\r\n"},{"image":1916,"label":"Central drive, radial bridge, torsion trestle scraping clarifier","value":"EM18 ","models_popup":"\r\n
\r\n

EM18 - SCRAPER BRIDGE WITH TORSION TRESTLE FOR CIRCULAR TANK<\/h2>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Application<\/td>\r\nClarifying of primary and secondary waste water<\/td>\r\n<\/tr>\r\n
Characteristics<\/td>\r\nThe equipment consists of a drive unit, a torsion trestle, two scraper arms, a diffusion drum.<\/td>\r\n<\/tr>\r\n
Operation<\/td>\r\nThe water to be treated flows into the diffusion drum where the kinetic energy is slowed down, the sedimentable solids settle on the tank bottom and are conveyed towards to central drain well by the bottom scrapers.<\/td>\r\n<\/tr>\r\n
Materials<\/td>\r\nHot dip galvanized carbon steel or Stainless steel<\/td>\r\n<\/tr>\r\n
Installation<\/td>\r\nIn a concrete tank<\/td>\r\n<\/tr>\r\n
Tank diametre<\/td>\r\nFrom 2 to 50 m.<\/td>\r\n<\/tr>\r\n
Optionals<\/td>\r\nScum removal system<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

<\/h3>\r\n

PRINCIPLES OF SIZING<\/h6>\r\nHydraulic sizing (process) The sizing of the diffusion drum is based on the following parametres: \u2022 influent flow rate \u2022 piping diametre The water coming out of the diffusion drum to the sedimentation zone must have a very low kinetic energy in order to guarantee a good separation and settling of the solids. Moreover, the bottom scrapers must have a continuous and logarythmic profile in order to successfully convey the sludge into the central well in less than a complete rotation of the shaft, 270\u00b0 (\u00be).\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n Mechanical Sizing<\/strong> The sizing of the bottom scraper is based on the type of sludge to be evacuated from the tank bottom. Normally the central shaft and the scrapers are designed to bear a stress of 20 Kg. per linear metre. The torque to transmit is calculated by T [kgm] = r\u00b2 x K r \u00e8 is the tank radius K is the load on the scrapers per linear metre (20 kg for biological clarifiers) For a reliability purpose, the drive unit shall be capable of transmitting a 1.8 higher torque than the design value.\r\n\r\n \r\n\r\nTorque limiting device (dynamometric cell)\u00a0<\/strong> The dynamometric cell measures the torque transmitted by the drive unit. This value is evident directly on the instrument and allows to evaluate the stresses on the trestle during the rotation. The device is equipped with limit switches set at two different torque values, one for alarm and one for the machine shutdown.\r\n\r\n \r\n\r\nSelection of the electric motor<\/strong> The electric motor size is selected so that, in case of shutdown, its static torque is lower than the one which can be borne by each downstream unit. For this reason the electric motor is usually very small. Exuberant motors may cause, in case of shutdown, serious damages to the structures if the torque limiting device fails to intervene or if it is not properly connected.\r\n\r\n \r\n\r\nExample of calculation<\/strong>\r\n\r\nTank diametre 20 m. K = 20 Scrapers peripheral speed 1,5 m\/min Slow shaft rpm 0,023 Torque r\u00b2 x K = 10\u00b2 x 20 = 2000 kgm so the drive unit shall be designed to transmit a 1.8 higher torque.\r\n\r\n \r\n\r\nElectric Motor<\/strong>\r\n\r\nTo transmit a torque of 2000 kgm at 0.023 rpm, 64 watt are necessary. If we hypothize a drive unit output of 60%, the electric motor shall have a power of 107 watt. Normally it is difficult to find electric motors which are smaller than 0,18 kw - 180 watt. If the selected motor has got a power of 180 watt, in case of shutdown it might give a 2.6 times higher power for a few seconds, i.e. 468 watt. The torque transmitted by the motor to the torsion trestle, with a drive unit output of 60%, would be equal to 5700 kgm. In this case it should be evaluated whether to install a shear pin or a dynamometric cell to limit the torque.\r\n\r\n"},{"image":"","label":"Central drive, radial bridge, torsion trestle suction type clarifier","value":"EM30","models_popup":"\r\n\r\n
\r\n

EM30 - CENTRAL DRIVE \u2013 SUCTION TYPE SCRAPER BRIDGE WITH TORSION TRESTLE, FOR CIRCULAR TANK<\/h2>\r\n<\/div>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Application<\/td>\r\nClarifying of secondary waste water<\/td>\r\n<\/tr>\r\n
Characteristics<\/td>\r\nThe equipment consists of a rotating bridge and a torsion trestle with suction pipes all over the tank diametre.<\/td>\r\n<\/tr>\r\n
Operation<\/td>\r\nThe water to be treated flows into the diffusion drum where the kinetic energy is slowed down, the sedimentable solids settle on the tank bottom and are sucked by the suction pipes equipped with regulating telescopic valves.<\/td>\r\n<\/tr>\r\n
Materials<\/td>\r\nHot dip galvanized carbon steel or Stainless steel<\/td>\r\n<\/tr>\r\n
Installation<\/td>\r\nIn a concrete tank<\/td>\r\n<\/tr>\r\n
Tank diametre<\/td>\r\nFrom 8 to 60 m.<\/td>\r\n<\/tr>\r\n
Optionals<\/td>\r\nScum removal system<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

<\/h3>\r\n

PRINCIPLES OF SIZING<\/h6>\r\nSludge suction unit sizing. For the project of the sludge suction unit we have to make sure that the sludge is quickly removed from the tank bottom because if it tends to settle or get too thick for staying in the tank for a too long time, it may happen that: \u2022 a part of the recycled sludge returns to the oxidation tank when it is no more fresh and this will affect the treatment efficiency \u2022 a shortage of dissolved oxygen may cause a leakage of sludge in the effluent\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\nMechanical Sizing Same principles as described for the Central drive scraper bridge mod. EM16.\r\n\r\n \r\n
OPERATION DESCRIPTION<\/h6>\r\nThe bottom of the suction scraper bridge tank is flat and the suction pipes, sized according to sludge recycle flow rate, are placed at a distance which does not exceed 3 m. The sludge is conveyed towards the suction pipe by V-shaped scrapers which make the flowing of the sludge towards the piping much easier. Each suction pipe is equipped with a telescopic valve to regulate the flow into the hopper. The quality and quantity of sludge sucked by each pipe can be checked from the bridge. The sludge flows into the hopper according to the principle of the communicating vessels. The sludge flow rate depends on the difference of level between the water surface and the sludge level in the hopper. The sludge sucked by all of the suction pipes is conveyed out of the tank by means of a self-regulating siphon. The triggering of the siphon can be made during the commissioning phase by means of a pump or ejector.\r\n

<\/h3>\r\n

TECHNICAL AND DIMENSIONAL DATA NECESSARY TO MAKE A TECHNICAL PROPOSAL AND QUOTATION<\/h6>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
1.<\/td>\r\nFlow rate to the sedimentation tank (total)<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
2.<\/td>\r\nFlow rate coming from the sedimentation tank (at the overflow weir)<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
3.<\/td>\r\nFlow rate of sludge coming from the sedimentation tank<\/td>\r\n: m3\/h<\/td>\r\n<\/tr>\r\n
4.<\/td>\r\nTank diameter<\/td>\r\n: m.<\/td>\r\n<\/tr>\r\n
5.<\/td>\r\nDiameter of the feed pipe<\/td>\r\n: mm.<\/td>\r\n<\/tr>\r\n
6.<\/td>\r\nSludge level in the drain well<\/td>\r\n: +m.<\/td>\r\n<\/tr>\r\n
7.<\/td>\r\nWater level in the sedimentation tank<\/td>\r\n: +m.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n"}]}]},{"title":"Accessories","select":"Acordion","acordion":"\r\n

Oil and grease collecting system with scraping blade<\/p>\r\n

Oil and grease collecting system with submersible pump<\/p>\r\n

Weirs and scum blades automatic cleaning system with motorized brush<\/p>\r\n

Telescopic valve<\/p>\r\n

Ice protection on running path<\/p>\r\n

Wheel slipping alarm<\/p>\r\n","complex":null}]},"technical_information":{"text":"\r\n

\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n
\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n
OUTLINES OF THE SEDIMENTATION PROCESS<\/h6>\r\nA good efficiency of the sedimentation process gives as a result a considerable reduction of BOD, COD, heavy metals, azote, phosphorus, etc. in the treated water. As the suspended substances in the waste water become larger, their sedimentation becomes easier.Stokes\u2019 law emphasizes the importance of the floc size for the speed of sedimentation. \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n<\/div>\r\n
\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n\"\"\r\n\r\nV = speed of sedimentation in m\/s \u03c1 = density of solids in kg\/m\u00b3 \u03c10\u00a0= densit\u00e0 dell\u2019acqua kg\/m\u00b3 g = 9,81 m\/s2 \u03bc = viscosity of water in in Pa x s (at 15\u00b0 C the viscosity of water is 1,06 x 10-3\u00a0Pa x s) D = diametre of the particle in m.\r\n\r\nA good way to obtain large flocs in the clarifier feeding is the installation of baffles using the kinetic energy of water to agglomerate the flocs to each other\r\n\r\n\"\"\r\n
\r\n
<\/div>\r\n<\/div>\r\nIn the secondary clarifiers, the type of scraping blades and the sizing of the central drain well are very important. \r\n\r\nActually, given the enormous volume of \u201csludge\u201d compared to the feed flow rate (50%), we can hypothize that the sludge characteristics are just a little different from the ones of the clarified water (under static conditions the clarified water and the sludge stratify with a horizontal separation surface) and that, consequently, due to the slight bottom slope (\u223c 4%), it flows naturally towards the central well. However, we should not forget that the particles which touch the bottom, and the ones which stratify, adhere and loose the properties of \u201cfluid\u201d: so they must be actively moved and \u201cpushed\u201d towards the drain well before the layer becomes too thick and, above all, before the anoxic condition causes a strong de-nitrification with the production of floating plates. Therefore all of the sedimented sludge particles conveyed by the bottom scrapers to the central well from the tank periphery, must reach it quickly. This is achieved by giving a continuous profile with logarythmic shape to the blade; the relevant equation in polar coordinates is:\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n<\/div>\r\n
r=r0<\/sub>\u00b7em\u03b1<\/sup><\/div>\r\n
\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\nwhere\u00a0r\u00a0and \u03b1 are the polar coordinates having the tank centre as a pole and ro\u00a0is the radius of the drain well. Under these conditions, the scraper moves the sludge, makes it more \u201cfluid\u201d (by eliminating the adhesion) and conveys it by a perpendicular force to its surface (Pascal); this force has a radial centripetal component, not null and constant. The angle \u03b3 is determined by:\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n<\/div>\r\n
\r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n \r\n\r\n\"\"\r\n
<\/div>\r\n<\/div>\r\n"},"gallery":{"items":[{"name":"EM10A C5463-Vyksa RUS","image":1908},{"name":"EM10C C5224-Rimini ITA","image":1909},{"name":"EM10D C5281-Lagos NIG","image":1910},{"name":"EM17 AlKhumrah","image":1919},{"name":"EM17 BeniMessous","image":1912},{"name":"EM17A1 58-mTunisia-1","image":1918},{"name":"EM17A1 Italia","image":1911},{"name":"EM17C ATLATEC-MESSICO-C04935-2","image":1917},{"name":"EM17C C4935-Guadalajara MEX","image":1913},{"name":"EM17C C5317-Al-Khorayef KSA","image":1914},{"name":"EM18 ATLATEC-MESSICO-C04935-1","image":1916},{"name":"EM18 D50m-NorskeSkog2 Tasmania","image":1905},{"name":"EM18 D50m-NorskeSkog Tasmania","image":1906},{"name":"EM29B C4929-Bejaja Algerie","image":1907},{"name":"EM29C C04678","image":1915}]},"download_the_brochure":{"file":1904},"description":{"text":"\r\n\r\nThey play a crucial role in wastewater treatment. These devices are designed to\u00a0reduce sludge volume,<\/strong> concentrating the solid fraction and decreasing the water content, so as to\u00a0improve the efficiency of the downstream treatments and reduce operating and disposal costs.\u00a0\u00a0<\/strong>\r\n\r\nThickeners can be of different types, such as gravity or mechanical, each with specific features to suit different plant requirements.\r\n\r\n"},"subitems":{"items":[{"subtitle":"Predewatering units","subtext":"\r\n\r\nThey are devices designed to remove excess water from sludge before the final dewatering process. They help reduce the volume of sludge to be treated and optimize the overall efficiency of the water treatment process.\r\n\r\n"},{"subtitle":"Dosing units and skids","subtext":"\r\n\r\nThey are essential for integrating and optimizing water treatment processes, enabling precise dosing of chemical agents and efficient reagent management. They incorporate efficient and reliable thickeners, designed to maximize the overall efficiency of the treatment process.\r\n\r\n"}]},"single_product":{"tab_text":"Circular clarifiers and thickeners","tab_order":"4"}},"_links":{"self":[{"href":"https:\/\/ecomacchine.it\/en\/wp-json\/wp\/v2\/production\/1899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecomacchine.it\/en\/wp-json\/wp\/v2\/production"}],"about":[{"href":"https:\/\/ecomacchine.it\/en\/wp-json\/wp\/v2\/types\/production"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ecomacchine.it\/en\/wp-json\/wp\/v2\/media\/1911"}],"wp:attachment":[{"href":"https:\/\/ecomacchine.it\/en\/wp-json\/wp\/v2\/media?parent=1899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}