Reserve pit waste treatment system

• US 4,526,687 A
• Filed: 10/24/1983
• Issued: 07/02/1985
• Est. Priority Date: 03/12/1982
• Status: Expired due to Fees

• Current Assignee: Water & Industrial Waste Laboratories Incorporated
• Original Assignee: Water & Industrial Waste Laboratories Incorporated
• Inventors: Nugent, James E.
• Primary Examiner(s): HRUSKOCI, PETER A
• Application Number:
  US06/544,520
• Time in Patent Office: 617 Days
• Field of Search: 175/66, 175/206, 210/702, 210/714, 210/738, 210/195.1, 210/199, 210/205, 210/207, 210/208, 210/219, 210/237, 210/249, 210/260, 210/241, 210/541, 210/542, 210/202, 210/521
• US Class Current: 210/202
• CPC Class Codes: B01D 21/0033 Vertical, perforated partition walls B01D21/2422 takes precedence
• CPC Class Codes: B01D 21/08 provided with flocculating compartments
• CPC Class Codes: B01D 21/2461 Positive-displacement pumps; Screw feeders; Trough conveyors
• CPC Class Codes: B01D 21/305 Control of chemical properties of a component, e.g. control of pH
• CPC Class Codes: B01D 2221/04 Separation devices for treating liquids from earth drilling, mining separation of well effluents E21B43/34, flotation in general B03D1/00
• CPC Class Codes: B01D 2221/08 Mobile separation devices
• CPC Class Codes: C02F 1/5281 Installations for water purification using chemical agents
• CPC Class Codes: C02F 11/00 Treatment of sludge; Devices therefor
• CPC Class Codes: C02F 2103/10 from quarries or from mining activities
• CPC Class Codes: C02F 2201/008 Mobile apparatus and plants, e.g. mounted on a vehicle for biological treatment C02F2203/008
• CPC Class Codes: Y10S 588/90 Apparatus

Abstract

A chemical mixing apparatus comprises a preferably cylindrical mixing tank having a flow inlet at the lower bottom central portion of the tank, the flow inlet providing an injection conduit which proceed vertically a distance into the tank. A floc concentration tube is provided with an inner bore, the tube being vertically mounted in the tank about the injection conduit with the tube having a lower fluid inlet and an upper fluid outlet, the fluid inlet being in communication with the tank by means of a plurality of perforations in the tube at the fluid inlet adjacent the bottom of the tank. A rotatable propeller shaft having a mixing propeller mounted thereon is attached to the tank structure, the shaft being mounted at least in the tube bore above the injection conduit with the propeller being between the lower fluid inlet and the upper outlet immediately adjacent the outlet of the injection conduit. A cylindrical shroud baffle having a diameter greater than the diameter of the tube is mounted within the tank at the upper fluid outlet and surrounding the fluid outlet of the tube. The baffle provides upper and lower edge portions projecting respectively a distance above and below the fluid outlet. The tube provides a floc concentration chamber which surrounds the point of injection of the waste stream entering the tank together with chemicals which are injected to enhance formation of floc in a manner which enhances recirculation and therefore floc build-up.

Claims

1. A self-contained, transportable waste treatment apparatus comprising:

a. an elongated, transportable, structural sled;

b. a fluid inlet discharging into the bottom of at least one mixing tank at one end of the sled for supplying a waste stream containing a chemical enhancing the formation for floc thereto;

c. a hollow tube disposed vertically within the tank and surrounding the inlet, and means for circulating fluid through and around the tube so that the circulating fluid discharges from the top of the tube and then circulates around the tube in a direction which returns the fluid into the bottom of said tube to the area adjacent the inlet;

d. a plurality of vertically standing intersecting walls disposed about the periphery of the sled to define a settling tank on the sled;

e. outlet means at the end of the settling tank opposite the mixing tank for removing supernatent liquid from the settling tank so that flow proceeds through the tank in a general direction from the fluid inlet to the outlet means;

f. a plurality of vertically disposed baffle sections with small spaces therebetween forming a baffle structure extending from the top to the bottom of said settling tank that is placed interiorly of the settling tank transverse to the direction of flow, dividing the settling tank into primary and secondary sections, said spaces allowing the passage of water therethough to maintain a constant fluid level in said settling tank while enhancing floc size and solids deposition;

g. inlet wier means for transmitting supernatant liquid from the mixing tank to the primary section of the settling tank; and

h. sludge drawoff means supported by the sled and disposed at the lower portion of the settling tank for removing settled sludge material from the primary and the secondary sections of the settling basin.

2. The self-contained transportable waste treatment apparatus of claim 1 further comprising lifting eye means for lifting the pad.

3. The self-contained transportable waste treatment apparatus of claim 1 further comprising sludge concentration means connectable to the sludge drawoff means for dewatering sludge removed from the settling tank.

4. The self-contained transportable waste treatment apparatus of claim 1 wherein there are two mixing tanks mounted on the sled and flow proceeds sequentially from one mixing tank to the second mixing tank before entering the inlet weir means.

5. The self-contained transportable waste treatment apparatus of claim 4, wherein the first and second mixing tanks are sequentially connected by a flow line from the top of the first tank to the bottom of the second tank.

6. The self-contained transportable waste treatment apparatus of claim 1 wherein the weir means comprises a weir laterally extending across the top of one end of the upper portion of the settling tank with a weir discharge transmitting fluid to the settling tank primary section with a stream that extends across the tank width.

7. The self-contained transportable waste treatment apparatus of claim 1, wherein the sled is generally rectangular.

8. The self-contained transportable waste treatment apparatus of claim 1 wherein the horizontal cross section of the settling tank is rectangular corresponding with the surface area of the sled.