Diffuser (sewage)

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

Valve-less diffuser micropumps fabricated using thermoplastic replication

Abstract: This paper presents valve-less diffuser micropumps fabricated using thermoplastic replication Thermoplastic replication is very suitable for a valve-less diffuser pump due to its simple planar geometry Two different thermoplastic replication methods have been tested: hot embossing and injection molding We use 01 and 02 mm deep precision-milled brass mold inserts and 20 and 80 μm deep microelectroformed nickel mold inserts defined from deep reactive ion etched (DRIE) silicon wafers For the injection molding a commercially available compact disc injection-molding machine (Toolex Alpha MD100) is used to fabricate the diffuser micropumps The cycle times are extremely short, less than 10 s per disc, and one properly fabricated nickel mold insert can be used to fabricate more than 10 000 plastic discs The plastic material cost is about 5 cents per disc Tested pumps reach a maximum volume flow of 12 ml min−1 and a maximum pump pressure of 16 kPa

Bulk diffuser for flat panel display

Abstract: The invention features a bulk light diffuser material. The bulk light diffuser material may be a sheet or film comprising about 95 to about 99.8 percent by weight of polycarbonate and about 0.2 to about 2.5 percent by weight of a particulate light diffusing component, based on the total weight of the polycarbonate and the light diffusing particles (128). The sheet material has a percent transmittance of at least 70% and a haze of at least 10% measured according to the American Society for Testing and Materials (ASTM) standard D 1003.

Air bag device

Abstract: PROBLEM TO BE SOLVED: To prevent the loosening of a joined part between a diffuser and a housing SOLUTION: An air bag device is provided with a diffuser 12 for controlling the jetting-out of pressure gas, an air bag 10 inflated by the pressure gas controlling by the diffuser 12, and a housing 14 for housing the diffuser 12 and the air bag 10, an air bag attaching part 23 is provided between the diffuser 12 and the housing 14, and the diffuser 12 and the housing 14 are fixed by bolts 30 and 31 penetrating the attaching part 23 In this air bag 10 device, a relief hole having holes widened for the penetration of the bolts 30 and 31 is formed in the air bag attaching part 23, and the diffuser 12 and the housing 14 are fastened and fixed to each other by the bolts 30 and 31 while these are directly brought into surface-contact with each other by the relief hole

A valve-less planar pump isotropically etched in silicon

Abstract: The first valve-less diffuser fluid pump in silicon is presented. It consists of a planar double-chamber arrangement fabricated in a silicon wafer anodically bonded to a glass wafer. The pump uses fluid-directing diffuser - nozzle elements which have a depth of and a neck width of . The pump chamber diameter is 6 mm. Pump cavities and diffuser - nozzle elements are etched with an isotropic HNA silicon etch. Pumps with three different diffuser lengths are compared reaching a maximum pump capacity of and a maximum pump pressure of 1.7 m at a resonance frequency of 1318 Hz for methanol.

Aeration Process in Bioreactors as the Main Energy Consumer in a Wastewater Treatment Plant. Review of Solutions and Methods of Process Optimization

Abstract: Due to the key role of the biological decomposition process of organic compounds in wastewater treatment, a very important thing is appropriate aeration of activated sludge, because microorganisms have to be supplied with an appropriate amount of oxygen. Aeration is one of the most energy-consuming processes in the conventional activated sludge systems of wastewater treatment technology (may consume from 50% to 90% of electricity used by a plant), which makes it the most cost-generating process incurred by treatment plants. The paper presents the construction of aeration systems, their classification as well as parameters and factors that significantly affect the aeration process e.g., oxygen transfer efficiency, diffuser fouling, methods of dealing with diffuser fouling, diffuser selection. Additionally, there are briefly presented “smart control” systems in wastewater treatment and effect of application control strategy based on Supervisory Control and Data Acquisition system connected with the decrease in the energy consumption for aeration of bioreactors with activated sludge. It is noted that before the process is optimized, the system should be equipped with suitable metering devices. Only when relevant data is available, the improvements can be carried out. However, it’s important, that the operator should regularly maintain good condition and high efficiency of diffusers.