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Clarifier

- High reduction of wastewater flow velocity to ensure settling.
- Low maintenance and operational skills required.
- Design and manufacturing of rotating bridges for clarifier tanks of up to d=40 [m].
Description

Trustworthy separation of sludge from wastewater

  • High reduction of wastewater flow velocity to ensure settling.
  • Low maintenance and operational skills required.
  • Design and manufacturing of rotating bridges for clarifier tanks of up to d=40 [m].

Principle and Function

The Wamechsi Clarifier is designed to reduce the velocity of the wastewater flow allowing heavier organic solids to settle. The main principle of treatment by sedimentation is to remove readily settleable solids and floating material and thus reduce the suspended solids content.

Two types of Clarifiers are commonly used in wastewater treatment plants, namely Primary Settling Tanks and Secondary Settling Tanks.

Primary Settling Tanks are the first stage of treatment after the removal of rags and grit in the inlet works. Scrappers present in the tank move continuously along the floor of the tank to deposit the raw sludge into hoppers for removal.

Secondary Settling Tanks are used in activated sludge systems for separating treated water from biomass, settling sludge and sufficiently thickening it so that when the sludge is returned to the tank inlet, it can maintain the biomass concentration levels required.

 

 

 

 

 

 

The Wamechsi Clarifier gives special attention to the method used to collect this sludge: large amounts have to be collected and the biological nature of the sludge requires tight control over their contact time on the tank floor in order to avoid any unwarranted changes caused by a prolonged lack of aeration.

Technical Data: (Typical)
Clarifier Tank Size:                               

Clarifier Bridge Length:                                  

                                                           

Operating Speed of Rotating Bridge: 

Material of Rotating Bridge:                

                                                           

Type of Bearing:                                 

Motor & Gearbox Data (Scraper Bridge):

Make & Model:                                   

Rated Motor Power:                

Gearbox Rating:                    
                                                               
Gearbox Service Factor:         

Full Load Current:                         

Electrical Supply:                      220/380 ????? ??, 50 [??]

Advantages of the Wamechsi Group Clarifier:

  • Continuous clarification ensures to reduce the velocity of the wastewater effectively for heavier organic solids to settle.
  • Relatively inexpensive to install and operate.
  • No specialized operational skills required to operate the Wamechsi Clarifier.
  • Low energy input required.

The Wamechsi Group Clarifier consists of the following key parts:

  • Motor & Gearbox

The installation of the electrical motor and gearbox enables the scraper bridge to move continuously circular inside the civil tank to reduce the velocity of the wastewater flow allowing heavier organic solids to settle. This is crucial in automating the sewage treatment facility.

  • Rotating Bridge

The rotating bridge is fixed to the lower cradle on the central column. The bridge is constructed as a truss beam with the kick plate welded to the longitudinal main beams. The purpose of the bridge is to move continuously inside the circular clarifier tank to ensure the reduction of the wastewater velocity to allow the heavier organic solids to settle.

The Wamechsi Clarifier Bridge is manufactured in epoxy coated or hot dip galvanized mild steel or stainless steel according to requirements.

-          Drive system

The drive system and idler system are fixed to the bridge by means of the provided drive and idler carriages. On each bridge a drive system and idler system are provided. The carriage system is provided with slotted holes to provide vertical adjustment of the wheels if required by unforeseen concrete problems. The torque of the gearbox is controlled by the torque arm, which should react on the angle bracket provided on the bridge.

-          Scum Removal

The surface scum is skimmed off the surface towards the scum box. With each revolution of the bridge the scum is collected in the scum box and flushed away. The scum box has a scum lever, which opens the scum prop. The contents and approaching scum is flushed through the scum opening.

-          Bottom Scraper System

Sludge accumulates at the bottom of the clarifier and is then scraped and removed via diagonal blades attached to the rake arms. The bottom scraper blade is a logarithmic spiral blade and is installed 5 – 10 [mm] from the clarifier tank floor which scrapes the sludge toward the center of the tank into the sludge collection pit.

-          Overflow Weir

A V-notch adjustable weir is designed to ensure steady overflow rates.