What are Rim Flow Sludge Suction Clarifiers?
Rim-Flow Clarifiers, peripheral-feed, peripheral takeoff clarifiers, have an established track record in wastewater facilities across the world.
They provide increased capacity, higher overflow rates, optimum hydraulic stability, full surface and feed channel skimming, maximum design freedom, and cheaper construction costs when used as a secondary activated sludge clarifiers in sewage treatment facilities.
A Rim-Flow Clarifier can be smaller than a centre feed unit due to its higher hydraulic efficiency (50 to 80 percent more than centre feed clarifiers), or the extra capacity can be used as a cautious consideration when constructing treatment plants. They give the extra capacity needed to relieve overload conditions when installed in existing clarifiers.
Comparisons to Clarifiers with a Center Feed
Rim-Flow Clarifiers have been compared against center feed clarifiers in a variety of cost studies. When tank dimensions are similar and all expenditures are included, these studies show that there is little, if any, cost difference between the two types. The Rim-Flow Clarifier is particularly cost-effective due to the demand for cantilevered effluent troughs and energy dissipating feed wells in the center feed design.
Smaller tanks may typically be employed because of the higher hydraulic loadings achievable with Rim-Flow Clarifiers. As a result, the cost of land and building can be significantly decreased. It is not necessary to excavate as much. Netsol Water Solutions will be delighted to provide you with cost comparison research.
Advantages of Rim-Flow Suction Clarifiers
1: It is claimed that given the same clarifier volume as conventional center feed clarifiers, these types of clarifiers can handle much higher throughputs and therising sludge phenomenon is minimized.
2: The need for a buried central feed pipe in large central feed clarifiers is avoided in rim flow suction clarifiers.
3: The sludge is sucked out as soon as it settles on the floor and is transferred to aerationtank and thus avoiding cell lysis.
4: With both the influent and effluent channels on the tank perimeter, the Rim-Flow Clarifier allows for excellent skimming of the whole tank surface as well as the influent raceway.
5: A scum barrier added to the effluent launder prevents accumulated surface scum from entering the effluent channel in the Rim-Flow Clarifier.
6: A blade installed on an extension of the skimmer arm provides influence channel skimming, which guides scum in the channel to a weir gate for disposal. The design of this skimmer prevents scum from spanning the channel.
The weir gate is a simple, cost-effective design. The scum is collected and sent to the scum box region by the flow and skimmer arm. When the scum needs to be removed from the waterway, the gate is lowered. The operation time cycle is determined by the kind and volume of floatable material.The gate can be manual or motorised, with a time clock, limit switch, or sensing probe as an option.
Disadvantages of Rim-Flow Suction Clarifiers
1: Here again, each vendor advocates his own criteria for the equipment and theirtypes which makes it difficult to bring about a common and validated design criterion.
2: The sludge suction arrangement if it by any chance gets into repair necessitates the emptying of the clarifier for repairs.
Technical assistance and guidance
If you want to know more about Rim-Flow Suction Clarifiers and their design, then youcan have an expert solution upon contacting Netsol Water, a leading manufacturer of Industrial and Commercial Water Treatment Plants and Wastewater Treatment Plants, among other services. Our treatment systems are very effective at removing all types of chemical, physical, and biological pollutants.