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Environ Clarifiers described hereunder, are for chemical effluents, various types of industrial processing and even metallurgical processing, where the efficient separation of solids from liquids is the 'NEED'. Efficient separation of suspended solids or sedimentation is an important and essential aspect in effluent treatment, since it not only reduces considerably suspended solids loading, but also helps in reducing the COD/BOD loading, thereby contributing in reducing the sizing of subsequent processes viz. that of Biological treatments etc.
Thus, Clarification/Sedimentation, the process to remove suspended solids, is economical and has become an essential part of effluent treatment plants and raw water treatment plants. Suspended solids removal upto 70% and settleable solids removal upto 90% to 98% and COD removal as high as up to 40% are achievable with proper design of the clarifier unit. |
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The process is purely of gravity-separation. This is achieved by the reduction in velocity of the fluid and nearly 180o change in the direction of the flow. The separate solids would flow downward and settle on tapered floor. |
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The slow moving scraper mechanism having scraper arms with neoprene rubber/PP/HDPE/Brass squeegees, scrapes the floor and brings the settled sludge (suspended solids) to the central sludge well. The velocity or the movement of scraper arms, squeegees is designed in such a way that the sedimentation process is not distributed at all. There are two basis types of the clarifier mechanisms which are manufactured.
- End Drive/Traction Drive type Clarifier with central RCC column for support.
- Centre-Drive Clarifier.
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Even though we manufacture both types of Clarifiers at our
ENVIRON workshop (having 40,000 sq .ft. area), ENVIRON recommend Centre Drive clarifiers to their valued customers and clients for the following reasons :
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There are two scraper arms in Centre Drive type as compared to one scraper arm only, in End Drive type. So the floor is scraped Twice in one revolution of Centre Drive Clarifier, while in End Drive Clarifier the floor is scraped once only (as there is generally only one hanging scraper arm). Hence scraping efficiency is high in Centre Drive Clarifier.
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Centre Drive Clarifiers have low running/operating costs, and hence are more economical. For the same
diameter of the clarifier, the HP required for the End Drive Clarifiers is more than HP required for Central Drive Clarifier. For example, in 10 to 15 M Dia., the Centre Drive Clarifier the motor is of 1HP, while End Drive Clarifier
motors are never less than 2HP. So there is saving in Energy Charges.
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Centre Drive scraping is 'POSITIVE TORQUE' scarping, while in End Drive, since the scraper is hung from the traveling bridge, the factors for the scraping force i.e. the weight of scraper arm and frictional force between the wheel and the end wall top, are too low and becomes Zero when the wheels start slipping on the wall.
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From the maintenance point of view, there are more wearing parts in End Drive Clarifier and hence it results in more maintenance expenditure and Sustained Prolonged Down Times. Having more than Thirty years of manufacturing experience in effluent treatment plant machineries and having full fledged Research and Development Department attached with hydraulic testing facilities up to 150HP Aerators and having manufacturing facilities of 40,000 sq. ft. area, we have developed and incorporated following essential cum efficient features in Environ Clarifiers.
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| SPECIAL FEATURES : |
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1. High Torque 'ENVIRON' Centre drive with gears is designed for achieving
high scraping efficiency with additional Greaves gears to achieve High
reduction ratio.
2. SCRAPER ARMS LIFTING DEVICES in two varieties :
(a). HAND OPERATED SCRAPER ARMS LIFTING DEVICES :
This is our standard in-built feature in clarifier. This is provided at NO Extra Cost. When the scraper arms are embedded, in the sludge, due to prolonged stopping of the clarifier mechanism cannot be restarted. The motor will
triped, the scraper mechanism gets twisted up and drive gets overloaded and damaged. In such cases the effluent has to be pumped out and settled sludge has to be pumped out and settled sludge has to be removed to restart the mechanism in other makes. While in our clarifier there is NO PANIC. Operator has to come on the platform and has to operate the hand wheel. Both the scraper arms are lifted to a maximum height of 200 mm. Then the mechanism can be switched on the scraper arms can be lowered down slowly by operating handle in reverse direction.
(b). MOTORIZED SCRAPER ARMS LIFTING DEVICE:
Only 0.5HP extra electric motor and gearing operate the lifting of the scraper. This feature is provided us at an Extra Cost, if called for. |
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3. Fixed type full span bridge of lattice structure suitability designed to take required torque, and having least linear deflection. One meter high double row hand rails.
4. Suitably designed centre drive rotates the heavy mild steel tubular central pipe, having two scraper arms with neoprene rubber/HDPE/PP/BRASS squeegees with slots for height adjustment.
5. Central sludge well scraper.
6. Overload protection and lifting devices : Electro-mechanical overload protection device has load indicator, Hooter alarm and drive motor cutout switches. In addition to this unique feature particularly for thickners, Motorized semi automatic or automatic scraper arms lifting devices are also incorporated by us on clients demand at an extra cost. Hand operated scraper arms lifting device are provided with all Environ Clarifiers And Thickners as a standard feature.
7. POLYPROPLENE intake well is provided as an standard feature for longer life. |
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| ENVIRON CLARIFIERS WITHOUT BOTTOM WITHDRAWAL PIPE |
For the first time in India, we have Developed & Introduce for minimal maintenance, the ENVIRON Clarifiers without bottom sludge withdrawal pipe. The sludge at 5 to 10 mt. total head (pressure) can be obtained at the end of the platform simply by pipe flange connection, this can be taken either to sludge drying beds and / or to the aeration tanks for activated sludge plants.
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Relief from the frequent maintenance of chocked bottom sludge pipe.
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No separate buying and installing of sludge re circulation pumps.
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No special construction RCC dry sump for pump. So the feature
adds economy to clarifier installation an operation.
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SKIMMING DEVICE
The skimming mechanism, if required by the client OR required for particular applications, can be provided by us. Generally, this mechanism is required to remove floating debris, solids, which floats on effluent surface. It compromises of :
(1) Rotating Skimmer
(2) Scum Scraper
(3) Scum Box
Neoprene Rubber wipers are generally provided. The scum scraper collects the scum and drops it in scum box, which is connected to withdrawal piping. A scum skimming arm, supported on one of the scraper arm, is provided for removal of floating debris, solids. The collected scum is pushed by a level-loaded or spring loaded scraper into a scum box. Through this scum box the scum drains off the paddle and pipe. Thus floating scum is taken out from the clarifier. |
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