Feiyiya Inclined Plate Clarifiers Use Gravity & Innovative Engineering
A gravity clarifier is the most economical method of removing solids from liquids, using natural gravity as the source of energy and it is free. A clarifier simply provides a non-turbulent zone where heavier than liquid solids, suspended by turbulence, are given sufficient time to settle to a quiescent surface. The HEI inclined plate clarifiers are compact units with multiple layers of settling area utilizing less than 25% of the floor space required by conventional clarifiers.
Principle of Clarifiers
A particle carried forward by the velocity of the liquid flow must settle at a rate that allows it to reach the bottom before passing through the clarifer. Thus, particles beginning at a point [a" must traverse some route lying between ab and ab` in order to avoid being carried over the outlet.
If V is the horizontal velocity of the liquid, S the solids particle vertical settling velocity, L the length of the settling device, and D its depth, then particles entering at point A will settle to the bottom of the device only if V does not exceed: S(L/D)Since Vmax / S = L / D then, Vmax = S (L / D)
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Therefore, the velocity at which a horizontal clarifying device may be operated successfully is directly proportional to its length and inversely proportional to its depth.
This analysis applies to multiple horizontal plate units also. The spacing between plates is usually a few inches as opposed to a depth of several feet in a horizontal tank; therefore, [settling-out" times are dramatically reduced. The flow must be non-turbulent to prevent settled solids from being re-entrained within the moving liquid. Small plate spacing and a large surface area permits laminar flow at higher velocities than large horizontal tanks would allow.
Horizontal clarifying devices become self-flushing if they are inclined at an angle which exceeds the angle of repose of the settled solids. In such cases, flow enters the lower end of the device where settling particles move to the floor eventually sliding back out the entrance. Clear effluent leaves the top of the device.
However, when the device is inclined, the furthest settling particles no longer fall through distance D but some longer distance D`. This new longer settling distance D` is related to D by the relation: D = D` cos Ø.
Theta [Ø" is the angle, the device is inclined to the horizontal plane. Thus settling distance is increased by the factor: 1/cos Ø In the case where Ø = 60º, 1/cos Ø = 2.
The maximum settling distance is twice the distance between the plates. It is apparent then that the lower the angle of inclination, the smaller the settling distance. However, the angle of inclination must exceed the angle of repose of the solids to be separated. The previous equation may be modified to express the cosine of an inclined plate clarifying system as:
Vmax = L / (D / cosØ) (s) = L·cosØ / D (s)
Inclined Plate Clarifiers
A reduction of the required floor space is acquired by diminishing the separation between the horizontal plates to a few inches and stacking the settling surfaces. Inclining the plates to provide self flushing, 45º for heavy particles and 60º for light particles, reduces the available horizontal projected area (effective settling area) by a factor equivalent to the cosine of the angle. The surface area diagram (below) graphically compares the floor space requirements of an HEI inclined plate clarifier with the equivalent horizontal projected settling area.
Settling Rate
The settling rate for a specific solids should be determined by standard laboratory tests. Light particles, such as metal hydroxides, usually require a design parameter of 0.25 – 0.50 gallons per minute per square foot of horizontal projected area. These low density solids require the inclined plates to be set at a 60º angle to induce the particles to slide down the plate. Heavier particles (such as sand that easily flow) will readily slide from plates set at a 45º angle.
Maximum flow rate of an inclined plate clarifier is based on the flow rate per unit of a horizontally projected surface area. Retention time in the clarifier is not a design criteria. However, attaining optimum performance requires the prudent design to recognize several additional, very important factors.
Chicago Still & Box Alarm at the old Post Office
Last night, firefighters in Chicago responded to a fire on the roof of the historic Old Post Office building located at 433 West Van Buren Street. The incident drew attention from local companies who gathered nearby to observe the operation. Radioman911.com has shared audio recordings of the radio traffic, offering a glimpse into the emergency response efforts.
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**February 17, 2012: Chicago High-Rise Fire - Still and Box Alarm / EMS Plan 1 at the Old Post Office (433 W. Van Buren St.)**
*Part 1:*
As I tuned into the live stream provided by Radioman 911 on Justin.tv, the scene was already bustling with activity. Emergency vehicles lined the streets, their lights flashing against the dark backdrop of the city skyline. The first part of the recording captures the initial dispatch and arrival of the first responders. You can hear the urgency in their voices as they coordinate resources and assess the situation. It’s clear that this is no ordinary call—there’s a large structure involved, and the potential for danger is high.
The embedded player above allows you to listen to the first part of the radio traffic. Set to autoplay off, it gives you control over when to engage with the content. With the volume set at 25%, it ensures a balanced listening experience without being overwhelming. This segment covers the early stages of the operation, focusing on establishing a perimeter and initiating an aggressive attack plan.
*Part 2:*
Moving into the second part of the recording, the tone shifts slightly but remains intense. By now, firefighters have begun their ascent to the roof, where the fire appears to be concentrated. The radio chatter reveals updates on the progress made by various teams, including those responsible for ventilation and water supply lines. It's fascinating to hear how every decision made on the ground is meticulously communicated through these channels.
In this section, you’ll notice more detailed discussions about potential hazards like structural integrity and the spread of flames. The second embedded player offers the same features as before—autoplay disabled, adjustable volume, and full-screen capability. Watching the accompanying live video feed adds another layer of immersion, allowing you to see what the radio traffic describes.
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As someone who follows such events closely, it’s always intriguing to witness how well-coordinated these operations are despite the chaos unfolding around them. The Old Post Office building holds significant historical value, so there’s added pressure to ensure minimal damage while extinguishing the blaze. If you’re interested in diving deeper into the specifics of firefighting tactics or just enjoy watching real-time emergency management unfold, these recordings provide valuable insights.
Let me know if you have any questions about the details shared here. I’m happy to elaborate further based on what I’ve learned!