Provided is a compressed air jet device A composed of an discharge port member 1 provided on a pipe P for connecting to a compressed air supply source such that the opening thereof faces downwards, and a hole portion 14 provided in the connection 10 between the pipe P and the discharge port member 1 and allowing communication between the interior of the pipe P and the interior of the discharge port member 1, wherein the vertical cross-sectional shape of the peripheral wall 2 of the discharge port member is formed so that the interior side and/or the exterior side of the discharge port member are inclined to have a smaller wall thickness towards the free end of the opening 1 a.
A compressed air jetting mechanism 10 is provided on side walls 5 in a longitudinal direction inside a conduit body 2 along the longitudinal direction of the conduit body 2 at slightly under scum layer S generated in the conduit body 2, the scum S can be peeled off from the side walls 5 of the conduit body 2 when bubbles jetted out from the compressed air jetting mechanism 10a rise, and a nozzle 8b jetting pressure water out toward an upper surface of the generated scum layer S to promote a flow of the scum layer S to face a scum pit 3 is provided, so that the scum layer S can be promptly discharged to the scum pit 3.
A headrace system 1 improving a scum generation function of the headrace distributing and supplying raw water to a sedimentation basin provided in a sewage treatment plant to contribute to energy savings in the sewage treatment plant as a whole and contribute to solving environmental problems, which is provided with a buoyant imparting means 20 configured with including an ejector 22, in a side in which the raw water of a headrace body 2 to which the raw water is supplied or in the raw water flowed into the headrace 2 to impart buoyant force to solid matters contained in the raw water, and scum removing means 4, 8, 9, 10, 40a, and 40b removing scum S floating on a water surface of the headrace body 2.
A spout nozzle for a scum removal device provided in water where scum floats: a tip-end-side nozzle part of a nozzle body is formed in a flat cylindrical shape; a valve body closing a discharging opening by its own weight when pressure water is not supplied is provided in the tip-end-side nozzle part; a closing part closing an opening above the discharging opening when the discharging opening is closed is provided on the valve body; therefore, resistance is small even if it is arranged in water and moreover an interior is hardly stained by scum and the like contained in water.
B05B 1/04 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops in flat form, e.g. fan-like, sheet-like
B05B 1/32 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
C02F 1/40 - Devices for separating or removing fatty or oily substances or similar floating material
C02F 1/00 - Treatment of water, waste water, or sewage
5.
JET NOZZLE FOR SCUM REMOVAL DEVICE, AND WATER CONDUIT PROVIDED WITH JET NOZZLE FOR SCUM REMOVAL DEVICE
Provided is a jet nozzle for a scum removal device provided in water on which scum is floating. A tip-end-side nozzle part 12 of a nozzle body 10 is formed in a flat cylindrical shape, a valve body 20 is provided inside the tip-end-side nozzle part 12, the valve body 20 closing, by its own weight, a discharge opening 17a when pressured water is not supplied, and a closing part 23 being further provided to the valve body 20, the closing part 23 blocking an upper-side opening 18a when the discharge opening 17a is closed, whereby resistance is low even if the jet nozzle is underwater, and the inside of the jet nozzle is unlikely to be fouled with scum, etc., contained in the water.
Provided is a compressed air jet device A comprising an ejection outlet member 1 provided on a pipe P for connecting to a compressed air supply source such that the open outlet section thereof faces downwards, and a bore part 14 provided in the connection 10 between the pipe P and the ejection outlet member 1 and allowing communication between the interior of the pipe P and the interior of the ejection outlet member 1, wherein the vertical cross-sectional shape of the peripheral wall 2 of the ejection outlet member 1 is formed so that the interior side and/or the exterior side of the ejection outlet member are inclined to have a smaller wall thickness towards the free end of the open outlet section 1a.
This headrace system 1 improves the scum generation function of the headrace, which distributes and supplies raw water to a sediment basin provided in a sewage treatment plant, and thereby can contribute to energy savings in the sewage treatment plant as a whole and can contribute to solving environmental problems. The headrace system 1 is provided with: a buoyancy imparting means 20 that includes an ejector 22 which, on the side of headrace main body 2 where the raw water is supplied and enters, or, in the raw water that enters said headrace main body 2, imparts buoyancy to the solid matter contained in said raw water; and a scum removal means 4, 8, 9, 10, 40a, 40b that removes scum S floating on the surface of the water in the headrace main body 2.
A lengthwise side wall 5 on the inner side of a conduit body 2 is provided with a compressed air ejecting mechanism 10a which is located slightly below a scum layer S formed in the conduit body 2 and which extends along the lengthwise direction of the conduit body 2. It is possible to separate the scum S from the side wall 5 of the conduit body 2 when bubbles ejected from the compressed air ejecting mechanism 10a rise. The side wall 5 is further provided with a nozzle 8b which ejects, toward the upper surface of the formed scum layer S, pressurized water that promotes a flow so that the scum layer S is directed to a scum pit 3. Thus, it is possible to promptly discharge the scum layer S into the scum pit 3.
Provided is a discharge nozzle N for a scum removal device, the discharge nozzle N discharging pressurized water from underwater towards an opening section of a pipe skimmer of the scum removal device. An opening 11 of a discharge nozzle body 10 for the scum removal device is provided with a closure member 20 that closes the opening 11 by the weight of the closure member 20 itself when pressurized water is not discharged from the discharge nozzle body 10 for the scum removal device. Through said discharge nozzle for a scum removal device, the inside of the discharge nozzle is not easily contaminated by scum, etc., contained in the water.
B01D 21/24 - Feed or discharge mechanisms for settling tanks
B05B 1/32 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
C02F 1/40 - Devices for separating or removing fatty or oily substances or similar floating material
A spraying means is arranged on the scum-flowing wall surface side of wall surfaces forming a scum inlet of a scum discharging mechanism. The spraying means sprays pressured water upward along the wall surface on the scum-flowing side from when a part of the scum inlet is submerged in water until the scum begins to flow into the scum inlet. As a result, even large lumps of scum exceeding 10 cm in thickness (diameter) may be lead smoothly into a pipe by the pressured water, and the amount of discharged water accompanying scum discharge may be reduced to 1/20 to 1/30 than by a conventional scum removing apparatus.
Spouting means is provided on the side of scum flowing wall surface within the wall surface constituting a scum intake port of scum ejecting means. The spouting means spouts pressurized water upward along the wall surface on the scum flowing side during the period from sinking of portion of the scum intake port below the surface of water to the start of flow of scum into the scum intake port. Consequently, even when aggregated scum as large as over 10 cm in thickness (diameter) is contained, the scum can be smoothly led into a pipe by means of pressurized water. Thus, the amount of water discharged by the ejection of scum can be reduced to 1/20 to 1/30 of that of conventional scum removing apparatus.
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