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Screw press for dewatering sludge and fiber suspensions
New Patents
III
4709577
4709628
SYSTEM FOR CONTINUOUSLY MONITORING FOR LEAKS IN U N D E R G R O U N D STORAGE TANKS
SCREW PRESS FOR DEWATERING SLUDGE AND FIBER S U S P E N S I O N S Tad Glowacki, 162 24 Vsweded
Glenn M Thompson Research Corporation
assigned to
Tracer
An apparatus and method for detecting leaks from underground gasoline storage tanks and the like by routine or periodic soil samples tested for a particular tracer. A fluorinated halocarbon compound tracer having a boiling point less than that of gasoline is slowly dispensed within the gasoline, natural gas, or the like in the tank. A sampling pipe having a plurality of apertures therein is also buried in selected locations in the vicinity of the tank, and samples of the soil gas are pumped from the pipe and supplied to a Nation water separator prior to analysis by gas chromatographic techniques. If a leak in the tank should occur, the tracer will exit with the leaking gasoline, quickly vaporize, and travel rapidly by molecular diffusion in all directions. Elements of the tracer will therefore be detected in the soil gas pumped from the sample pipe using standard gas chromatography techniques, indicating that a leak exists in the tank.
A screw press for dewatering sludge and fiber suspensions, having a feed screw, a perforated drum surrounding the feed screw, an inlet or infeed aperture at one end of the drum, and an end wall section at the other end forming an annular outlet or outfeed aperture. The end-wall section includes a plurality of flaps located as an extension of the feed screw, the flaps being yieldably arranged to adjust the size of the outlet aperture. The end of each flap nearest the axis (9) of the feed screw (1) is pivotally mounted on an attachment connection (11), and the attachment connection (11) is arranged for movement along the axis of the feed screw (1). The flaps (7) are arranged to be pressed outwards under the influence of a first force generating arrangement (15,17,18) to form a larger angle with the screw axis (9), thereby causing the outlet aperture to decrease in size. The attachment connection (11) is arranged so that it and the flaps connected thereto can be moved axially towards the outlet aperture (5) under the influence of a second force generating arrangement (20,21,22), to also decrease the size of the outlet aperture, the two force generating arrangements being adjustable independently of one another.
4709585 METHOD AND APPARATUS FOR MONITORING ENVIRONMENTAL EVAPOTRANSPIRATION Jonathan M Altenhofen An atmometer for estimating a crop consumptive water evapotranspiration employs a green canvas colored material which is wrapped around a porcelain evaporating surface. The material simulates the albedo and diffusion resistance properties of the crop in order to provide an accurate estimation of evapotranspiration. A check valve at the bottom of the reservoir bottle helps prevent precipitation from adversely affecting the evapotranspiration estimate. Additionally, a sight glass is provided for indicating an amount of evaporated water.
4710298 AUXILIARY FOR DEWATERING OF SLUDGE Kimihiko Noda, Yoji Fujiura, Yoichi Hasegawa, Uji, Japan assigned to Sanyo Chemical Industries Ltd Dewatering of sludge is accomplished by adding an organic fibrous material having the bulk specific gravity increased by being pressed or being wetted with water and a high molecular weight flocculant to the sludge, adjusting the resulting flocs to a diameter of not more than 1 mm, and subjecting the flocs to vacuum or pressure filtration.
III
4709577
4709628
SYSTEM FOR CONTINUOUSLY MONITORING FOR LEAKS IN U N D E R G R O U N D STORAGE TANKS
SCREW PRESS FOR DEWATERING SLUDGE AND FIBER S U S P E N S I O N S Tad Glowacki, 162 24 Vsweded
Glenn M Thompson Research Corporation
assigned to
Tracer
An apparatus and method for detecting leaks from underground gasoline storage tanks and the like by routine or periodic soil samples tested for a particular tracer. A fluorinated halocarbon compound tracer having a boiling point less than that of gasoline is slowly dispensed within the gasoline, natural gas, or the like in the tank. A sampling pipe having a plurality of apertures therein is also buried in selected locations in the vicinity of the tank, and samples of the soil gas are pumped from the pipe and supplied to a Nation water separator prior to analysis by gas chromatographic techniques. If a leak in the tank should occur, the tracer will exit with the leaking gasoline, quickly vaporize, and travel rapidly by molecular diffusion in all directions. Elements of the tracer will therefore be detected in the soil gas pumped from the sample pipe using standard gas chromatography techniques, indicating that a leak exists in the tank.
A screw press for dewatering sludge and fiber suspensions, having a feed screw, a perforated drum surrounding the feed screw, an inlet or infeed aperture at one end of the drum, and an end wall section at the other end forming an annular outlet or outfeed aperture. The end-wall section includes a plurality of flaps located as an extension of the feed screw, the flaps being yieldably arranged to adjust the size of the outlet aperture. The end of each flap nearest the axis (9) of the feed screw (1) is pivotally mounted on an attachment connection (11), and the attachment connection (11) is arranged for movement along the axis of the feed screw (1). The flaps (7) are arranged to be pressed outwards under the influence of a first force generating arrangement (15,17,18) to form a larger angle with the screw axis (9), thereby causing the outlet aperture to decrease in size. The attachment connection (11) is arranged so that it and the flaps connected thereto can be moved axially towards the outlet aperture (5) under the influence of a second force generating arrangement (20,21,22), to also decrease the size of the outlet aperture, the two force generating arrangements being adjustable independently of one another.
4709585 METHOD AND APPARATUS FOR MONITORING ENVIRONMENTAL EVAPOTRANSPIRATION Jonathan M Altenhofen An atmometer for estimating a crop consumptive water evapotranspiration employs a green canvas colored material which is wrapped around a porcelain evaporating surface. The material simulates the albedo and diffusion resistance properties of the crop in order to provide an accurate estimation of evapotranspiration. A check valve at the bottom of the reservoir bottle helps prevent precipitation from adversely affecting the evapotranspiration estimate. Additionally, a sight glass is provided for indicating an amount of evaporated water.
4710298 AUXILIARY FOR DEWATERING OF SLUDGE Kimihiko Noda, Yoji Fujiura, Yoichi Hasegawa, Uji, Japan assigned to Sanyo Chemical Industries Ltd Dewatering of sludge is accomplished by adding an organic fibrous material having the bulk specific gravity increased by being pressed or being wetted with water and a high molecular weight flocculant to the sludge, adjusting the resulting flocs to a diameter of not more than 1 mm, and subjecting the flocs to vacuum or pressure filtration.