Method for treating animal waste with oxygen
Реферат: 1412271 Agitating and aerating liquids HOUDAILLE INDUSTRIES INC 3 Oct 1972 [4 Oct 1971] 45572/72 Heading B1C In a method of oxygenating a slurry of animal waste a high velocity stream of liquid is directed through an oxygen-containing atmosphere at the surface of the slurry, an aspirator tube being positioned with an inlet below the surface to receive the stream together with an entrained mixture of surface liquid and ambient atmosphere. An apparatus comprises a submerged pump 31 supplying slurry to a nozzle 47, air and liquid being aspirated through partly immersed apertures 52 the lower edges of which constitute the inlet of the aspiration tube 51. By opening the valve, 62 part of the slurry flow may be discharged to a mixing chamber 61 where pressurised dilution liquid is added, the diluted slurry then passing through conduit 27 to a place of use. The waste may be contained in a tank (20, Figs 1 and 2, not shown) divided into two chambers (22, 23) between which the slurry is circulated by the aerator and a return pipe (24); or in an oval channel (80, Fig 5, not shown) round which it is circulated; or a rectangular lagoon (85, Fig 11, not shown) having floating barriers (103, 108) to define flow paths. The aeration apparatus may be supported on floats (87) and have a clearing rod (101, Fig 10, not shown) for the nozzle 47. Preferably the nozzle is spaced more than 15 diameters above the liquid surface; the inlet of the aspiration tube is 5 to 6 nozzle diameters below the surface; the length of the aspirator tube is 30 to 40 times, and its diameter 3 to 4 times, the nozzle diameter; and the stream of liquid strikes the surface at an angle sufficient to ensure penetration but less than 85‹. The slurry is preferably oxygenated at a rate of 0.01 to 0.1 pounds per hour per pound five day biochemical oxygen demand of the waste input.
[GB1412271A]
Method for treating hog and animal waste
Номер патента: US20030057160A1. Автор: Christopher Williams,Derek Williams,Allan Hokanson. Владелец: Individual. Дата публикации: 2003-03-27.