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Circular clarifier cleaning system

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Circular clarifier cleaning system


The circular clarifier cleaning system includes a mainframe to which all various components are attached for the prevention of growth and accumulation of the algae and debris. The components within the system include gravity-driven, horizontal and vertical sweeping chains. The outer trough wall, V-notch weirs, baffle plate wall, and inner baffle plate wall are all cleaned utilizing a rotating chain system device. Two main drag chains are used to clean the effluent trough and the overflow in the overflow wall after the V-notch weirs. An individual chain is utilized as a “garland” to clean the V-notch weirs at the overflow. The circular clarifier cleaning system is driven by an existing skimmer arm found on all secondary clarifiers.
Related Terms: Mainframe

Inventor: SEYMOUR KERSHNER
USPTO Applicaton #: #20120285903 - Class: 210803 (USPTO) - 11/15/12 - Class 210 
Liquid Purification Or Separation > Processes >Separating >Utilizing Gravitational Force >Including Specified Feature Of Settled Solids Removal

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The Patent Description & Claims data below is from USPTO Patent Application 20120285903, Circular clarifier cleaning system.

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BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to wastewater treatment systems, and particularly to a circular clarifier cleaning system that can clean and prevent the development of algae and solids accumulation on the surfaces of a circular clarifier in a wastewater treatment plant.

2. Description of the Related Art

Clarifiers are well known in the prior art for separating suspended solids from clarified liquids. Most clarifiers operate by sedimentation of solids, i.e., solids sink and are collected from a bottom portion of the clarification vessel, or by flotation, i.e., solids are caused to float and are removed as a flotation blanket from the surface of the clarification vessel.

In a typical conventional activated sludge sewage treatment process, a considerable volume of scum and other gross floatables enters with the influent feed into the clarifier basin. This is distinct from biological scum, which arises from biological processes occurring in the basin. In conventional clarifiers, the influent scum and other floatables are often moved out of the influent well to be collected along with biological scum over the entire clarifier surface or at the periphery of the clarifier. The two types of scum typically are commingled and discharged together, and where influent well scum and floatables are collected, they are delivered to the periphery of the clarifier and commingled with biological scum.

Most prior art clarifiers exhibit shortcomings in that they allow algae, sludge and scum accumulation on the surfaces of the baffles, weirs, launders, and troughs. This build-up leads to operator maintenance.

Circular clarifiers can exhibit significant process advantages, especially when built on a large scale (e.g., sixty feet in diameter or more). In circular clarifiers, beaches are typically deployed radially to provide a surface for floatable solids collection. Also, in circular clarifiers, the influent feed may be introduced from a central, inner portion of the clarifier, and effluent may be removed from the outer perimeter under relatively quiescent conditions. Nevertheless, the problem of algae buildup remains.

Thus, a circular clarifier cleaning system solving the aforementioned problems is desired.

SUMMARY

OF THE INVENTION

The circular clarifier cleaning system includes a mainframe attached to a skimmer arm of a circular clarifier having an influent feed well and an effluent trough. Various components are attached to the mainframe for the prevention of growth and accumulation of algae and debris from surfaces of the circular clarifier. The components within the system include gravity-driven drag sweeping chains, vertically suspended rotating chains, and a chain disposed in a hanging V-formation, the chains being disposed at various orientations in relation to the clarifier surfaces. In this manner, the trough, inner and outer trough wall, V-notch weirs, baffle plate wall, and inner baffle plate wall are all cleaned as the skimmer arm rotates around the clarifier. Two main drag chain assemblies are used to clean the effluent trough and overflow in an overflow wall after a V-notch weir structure of the circular clarifier. An individual chain is utilized as a “garland” to remove trapped solids on the V-notch weirs at the overflow. The clarifier cleaning system is driven by an existing skimmer arm generally found on secondary clarifiers. The attachment could be as simple as drilling two holes in the existing steel arm and bolting up.

Municipalities throughout the United States utilize either rectangular, circular, or other types of clarification, depending on the engineering concept. This also applies to Industries that produce waste at their production facilities. The circular clarifier cleaning system applies to circular clarifier installations. The system eliminates the necessity of extensive and frequent manual cleaning of those clarifier components by utilizing sweeping drag chains and non-motorized rotating chains that impinge clarifier wall surfaces to allow the process water to flow unabated while preventing algae growth and material matting in the clarifier components.

These and other features of the present invention will become readily apparent upon further review of the following specification and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial environmental, perspective view of a circular clarifier cleaning system according to the present invention.

FIG. 2 is a partial environmental perspective view of the circular clarifier cleaning system of FIG. 1, showing the garland chain engaging the V-notch weir gap.

FIG. 3 is a partial diagrammatic side view of the circular clarifier cleaning system of FIG. 1, showing further details thereof.

Similar reference characters denote corresponding features consistently throughout the attached drawings.

DETAILED DESCRIPTION

OF THE PREFERRED EMBODIMENT

As shown in FIGS. 1 through 3, the circular clarifier cleaning system 10 attaches to an existing clarifier\'s scum skimmer arm 2a. The circular clarifier cleaning system 10 is designed for new or existing circular clarifiers at municipal or industrial wastewater treatment plants. Such circular clarifiers have a clarifier skimmer arm 2a and scum scraper blade 2b, which extend radially across an influent basin 120 to a location proximate the inside wall of the circular clarifier scum baffle B. The arm 2a and blade 2b are connected to a motor at the center of the circular clarifier to provide rotation of the arm 2a and blade 2b around the inside periphery of the clarifier scum baffle B. Thus, the circular clarifier cleaning system 10 is driven by an existing skimmer arm 2a generally found on secondary clarifiers. The method of attachment could be as simple as drilling two holes in the existing steel arm 2a and bolting up an elongate mainframe member 3a of the clarifier cleaning system 10. When attached in this manner, the circular clarifier cleaning system 10 has a low profile, and is also easily accessible.

The elongate mainframe member 3a of the circular clarifier cleaning system 10 is rigidly attached to, and projects radially from, the scum skimmer arm 2a in order to extend the cleaning system\'s reach over the clear effluent section of the clarifier to a point proximate the inner circumferential portion of the effluent trough wall 17.

A baffle wheel positioning member 3b is pivotally secured to the mainframe member 3a by a bracket assembly 35. The baffle wheel positioning member 3b is constrained to pivot in a plane parallel to the plane defined by rotational sweeping motion of the scum skimmer arm 2a and the rigidly attached mainframe member 3a. Preferably, all pivoting components of the clarifier cleaning system 10 have self-lubricating bearings at their pivot points.



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stats Patent Info
Application #
US 20120285903 A1
Publish Date
11/15/2012
Document #
13555112
File Date
07/21/2012
USPTO Class
210803
Other USPTO Classes
210528
International Class
01D21/06
Drawings
4


Mainframe


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