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Procedure for the Design and Sizing of an Inclined Plate Clarifier

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  Procedure for the design and sizing of an Inclined Plate Clarifier (parallel plate, lamella) for the removal of settleable suspended solids   Table of Contents  1. Inclined Plate Clarifier (parallel plate, lamella) Theory of Operation 2. General Considerations 3. Inclined Plate Clarifier Decision - Flow Diagram Determining if your process requires a clarifier or clarification system 4. Inclined Plate Clarifier Design - Flow Diagram Basic process in the design of an oil water separator or separation system 5. The Impact of Settling Rate on Inclined Plate Clarifier Design 6. Sizing the Clarifier or Clarification System Inputting the accumulated data to the Hydro-Flo Clarifier Sizing Spreadsheet to accurately size a clarifier or clarification system for your application 7. Comparing and Evaluating Clarifiers and Clarification Systems from Different Suppliers Reviewing and filling out the Hydro-Flo Technologies,  Application Questionnaire  will also help you gather pertinent information required for the proper design and application of inclined plate clarifiers and clarification systems.   Inclined Plate Clarifier (parallel plate, lamella) Theory of Operation Basic concepts and theories of clarification  If you are unfamiliar with basic inclined plate clarifier (plate settler, parallel plate clarifier, lamella plate settler, etc.) design principles, a review of the Inclined Plate Clarifier (parallel plate, lamella) Theory of Operation  might prove helpful. This basic document covers Stokes' law and other basic separation concepts. General Considerations  Inclined plate clarifiers are typically considered very simple devices. However, several factors that could potentially affect safety, efficiency, and proper management must be given careful consideration prior to the installation or modification of any clarifier or clarification system: 1. Flow Rate  In general, clarifiers are sized by the flow rate verses the separation chambers effective surface area (or, as it is more commonly called. the projected surface area). Therefore, the effectiveness of any clarifier is affected by the flow rate. The slower the flow, the better the results. 2. Design Capacity   A clarifier has upper limits to the amounts of suspended solids that can effectively accumulate while it is in operation. If too much sludge or settled suspended solids accumulate on the plates, it may carry over into the wastewater outlet chamber and end up being discharged to the environment. Proper clarifier design will Hyd     EnTo Typic Folloappli Applic Follo Clarifi Incli Detail sizi  DissolSysteinfor  Diss Detail se Oil WaSizing O Detail   take the plate spacing into consideration and also allow for the removal and storage of accumulated sludge from the clarifier to ensure that the accumulated products do not effect the operation of the clarifier. 3. Maintenance Practices  The ability of any clarifier to function properly depends upon the timely performance of required service and maintenance. Clarifiers must be monitored and maintained by competent personnel who understand how the systems operate. Clarifiers should be given the same close attention shown to any other important piece of equipment. The operators, users, and maintainers of the clarifier must be clear on who will be responsible for monitoring, inspecting, maintaining, and servicing the system. Frequent inspections should be made of the system and all associated piping, valves, etc. to prevent operational and mechanical failures or inefficiencies. Sludge needs to be regularly removed from the clarifier to keep it operating properly. Additionally, leaks from clarifiers can result in environmental pollution, which can trigger costly investigative studies and cleanups. Rigorous implementation of a clarifier inspection and maintenance plan can prevent discharges from the clarifier that may contaminate the environment. 4. Suitability of Inclined Plate Clarifier System to Process   A clarifier designed and installed to meet a past process requirement may no longer be suitable when process requirements change and/or the srcinal maintenance plan is no longer followed. A clarifier that is put to a use for which it was not srcinally designed may be damaged or may not function properly, and could become an environmental liability. For example, a clarifier designed to receive the wastewater discharge from a small heavy metal precipitation system will not be able to properly treat larger wastewater volumes for removing chrome from a tannery effluent. Process changes can also result in changes to the physical/chemical makeup of the wastewater being treated by a clarifier. 5. Contaminants Contained in the Wastewater Stream  Metallic particles in the wastewater will settle into the sludge at the bottom of the clarifier. Solvents or fuel compounds may also be entrained in the clarifier's sludge. This sludge could require management under the Resource Conservation and Recovery Act (RCRA) as a hazardous waste, if it exhibits certain toxicity characteristics. Therefore, it is important to prohibit the discharge of certain types of potential contaminants into a clarifier, and to regularly analyze sludge samples to determine toxicity prior to disposal. General improvements in spill/drip control and containment of hazardous materials and solvents will also reduce the amount of contamination in clarifier discharges.  Inclined Plate Clarifier Decision - Flow Diagram Determining if your process require a clarifier or clarification system   Misc I& Calc ReynW HFT Q HF ChemiComp CheCh Coati StandStan   STEP 1:   Identify Wastewater Source  Buildings and areas, as well as ALL activities and processes within the buildings and areas, that generate wastewater    STEP 2:   Institute Pollution Prevention and Source Elimination / Reduction Procedures Can the processes that generate the wastewater be eliminated? Can the process be converted to a dry process?  STEP 2-A:   Process altered or eliminated, no further discharge STOP  No Further Action Required   STEP 3:   Source Diversion Can the process be moved to an area that has existing clarification equipment in place? Can the existing equipment handle the increased flow? Is moving the process, diverting the flow, economically feasible?  STEP 3-A:   Process relocated or discharge diverted STOP  No Further Action Required    STEP 4:   Wastewater Compliance Evaluation Identify permit limits on ALL pollutants generated at the site. Characterize raw wastewater prior to any treatment, if appropriate. Characterize treated wastewater if existing treatment equipment is in place.  STEP 5:   Discharge & Pretreatment Requirements Does the raw wastewater meet permit limits and environmental requirements? Does he treated wastewater meet permit limits and environmental requirements?  STEP 5-A:   Discharge meets requirements, STOP  No Further Action Required   STEP 6:   New Clarifier or System Upgrades Required. Proceed to Inclined Plate Clarifier Design - Flow Diagram  
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