Diffuser (sewage)

About: Diffuser (sewage) is a research topic. Over the lifetime, 6487 publications have been published within this topic receiving 40404 citations.

Optimization of oxygen transfer through venturi-based systems applied to the biological sweetening of biogas

Abstract: BACKGROUND: Dissolved oxygen is a key parameter in the biological removal of gaseous H2S since sulfide-oxidizing bacteria convertH2Sintoelementalsulfurinsteadofsulfateunderlimitingdissolvedoxygenconcentrations.Elementalsulfurisinsoluble in water and accumulates in the packing material in biotrickling filters, increasing the pressure drop and operating costs. A set ofmasstransfertestswasperformedinaversatilepilotplanttosupplythenecessaryoxygenforthebiologicaloxidationofH2S. The plant can be operated with three different commercial gas‐liquid contactor devices: a venturi ejector, a jet-venturi and a diffuser. The effects of different geometric and operating parameters have been tested for each device (including pressure rise and sulfate content to mimic real wastewater treatment plant conditions). RESULTS: Results showed that the bioreactor pressure has a strong influence on the mass transfer characteristics of the three oxygenation devices. In addition, the ionic strength of the solution has a low influence on the mass transfer process. The SOTE values obtained for the diffuser, jet-venturi and venturi ejector were 8.7%, 7.2% and 6.0%, respectively (pure water experiments), while SAE values were in the range 6.3‐5.5 × 10 −2 ,4 .1‐4.8 × 10 −1 and 3.1‐3.7 × 10 −1 kg O2 kW −1 h −1 , respectively. CONCLUSIONS: The jet-venturi offers the best oxygen transfer with lower power consumption compared with the diffuser and venturi ejector. The practical implementation of the most efficient aeration technology is possible from both technical and economical perspectives. c � 2012 Society of Chemical Industry Supporting information may be found in the online version of this article.

Device for aiding the solubilization of gases in liquids

Abstract: An apparatus is disclosed for rapidly and efficiently dissolving gases in a liquid A diffuser, having a closed top and an opened bottom, preferably in the form of a conical-shaped frustum having a plurality of openings around the perimeter near the closed top, is submerged in the liquid and rotated at relatively high speeds creating a centrifuge-pump When the rotating diffuser is located near the surface of the liquid, no additional gas is required in the dissolution process because gas from the surface of the liquid is introduced by cavitation When the device is submerged substantially below the surface or if a gas other than oxygen is to be dissolved, additional gas must be pumped into the bottom opening of the rotating diffuser or very near the high velocity horizontal liquid jets on the periphery of the diffuser This device can be used in the oxygenation of treated sewage water, the removal of impurities from liquids, and the oxygenation of horticultural ponds to increase production

Optical diffuser plates

Abstract: The invention relates to optical diffuser plates (1) made of transparent plastics such as polycarbonate or polymethacrylate. Several thin strips (2) made of plastic B are inserted into plates made of transparent plastic A with the proviso that A and B are incompatible and the strips (2) made of plastic B are subsequently withdrawn. The hollows that are formed in the plate (1) made of plastic A are used to deflect light.

Combination sludge collector, aerator, and return pump

Abstract: The clarifier in any activated sludge sewage treatment plant must provide (a) a quiescent environment to allow gravity settling of the bio-mass (sludge) grown within the aeration tank, (b) the decanting of clear supernatant thus produced, and (c) the timely removal of all accumulated clarifier sludge. This invention improves prior clarifier performance by (a) providing vacuum assistance to gravity settling, (b) trapping all sedimentation within an aerated sludge containment zone, (c) providing clarifier sludge aeration to prevent denitrification, (d) utilization of spent aeration air for energy-free return sludge pumping, (e) the elimination of density currents and induced currents created by return sludge pumping, and (f) providing uniform hydraulic sludge collection eliminating the need for mechanical collection. The lower portion of the clarifier walls must be inward sloped to provide a hopper bottom. This invention then provides prefabricated hood(s), strategically placed over the hopper walls to form a sludge containment zone. The hood supports shall maintain continuous and adjustable spacing between the hood's lower edges and the hopper walls, forming access slots for sedimentation to enter the containment zone. The hopper sides shall continue their inward slope down and under the hood. The upper sides of the hood shall likewise be properly sloped to compliment the hopper slope. This invention invention shall provide aeration diffusers for uniform and consistent aeration without diffuser leveling and located below the hood, near the floor. Their size and placement are critical to (a) create a uniform vertically disposed rolling current to collect sedimentation below the protective hood and (b) insure entrapment of all entrained air and sedimentation. The aerators shall also provide free oxygen to negate potential clarifier sludge denitrification.