Mobile waste water and sludge treatment for hazardous and non-hazardous fluids

• US 4,536,286 A
• Filed: 12/09/1983
• Issued: 08/20/1985
• Est. Priority Date: 10/24/1983
• 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:
  US06/559,964
• Time in Patent Office: 620 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, 210/532.1, 210/521, 210/534 , 210/535
• US Class Current: 210/202
• CPC Class Codes: C02F 1/5281 Installations for water purification using chemical agents
• CPC Class Codes: C02F 2201/008 Mobile apparatus and plants, e.g. mounted on a vehicle

Abstract

A packaged, transportable waste treatment system for hazardous and non-hazardous wastes comprises a pair of mixing tanks having a flow inlet at the lower bottom central portion of the tanks, the flow inlet providing an injection conduit which proceeds vertically a distance into one of the tanks. 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 and 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 buildup. A second mixing tank further enhances floc buildup prior to settling.

Claims

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

a. an elongated, transportable, structural sled;

b. a pair of mixing tanks mounted at one end of the sled for mixing a liquid volume contained therein, at least one of the mixing tanks having a flow inlet discharging into the bottom thereof, a hollow tube disposed vertically within the tank and surrounding the inlet, and means for circulating fluid into the tube so that it discharges from the top of the tube and then circulates around the outside of the tube in a direction which returns the fluid into the bottom of the tube to an area adjacent said inlet;

c. means for supplying a waste stream containing a chemical enhancing the formation of floc to the mixing tanks through said flow inlet;

d. a generally rectangular settling tank supported on the sled and defined by a plurality of walls extending up from the peripheral edge portion of the sled;

e. conduit means connecting the mixing tanks with the settling tank for supplying supernatant liquid from the mixing tanks to the settling tank;

f. means within the mixing tanks for recirculating fluid within the mixing tank;

g. a plurality of vertically disposed 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 and generally transversely placed to the direction of flow through the settling tank and dividing the settling tank into at least primary and secondary sectors, said spaces allowing fluid flow therethrough and between the primary and secondary sectors to maintain a constant fluid level in said settling tank while enhancing floc size and solids deposition; and

h. multiple sludge drawoff means supported by the sled and including multiple sections disposed at the lower portion of the settling tank respectively in the primary and secondary sectors thereof, each sector thereof being formed by two planar surfaces sloped toward the mid portion of each sector, and the upper portion of each planar surface intersecting respectively a side wall of that sector and a baffle, the lower portions of each planar surface communicating with a drain channel for removing settled solid material from the primary and from the secondary sectors of the settling basin in a lateral direction with respect to the direction of flow of fluid through the settling tank.