Waste treatment aerobic

Uses Defoamer for water and waste treatment, aerobic and nonaerobic digesters and high turbulence aeration basins Features Non-mineral oil max. persistence... 

There are two methods of biological treatment aerobic and anaerobic (217). The aerobic systems use free oxygen dissolved in the wastewater to convert wastes in the presence of microorganisms to more microorganisms, energy required for their existence, and carbon dioxide. The anaerobic process occurs in the absence of free oxygen and converts the waste to methane and carbon dioxide, generally in deep tanks or basins, and can produce odor problems when sulfides or sulfates are present in the wastewater. 

A 3 Gaseous (gases, vapors, airborne particulates) W = Wastewater (aqueous waste) B11 Biological Treatment - Aerobic... 

Particle sizes used for aerobic waste treatment generally range from 100-1000 pm in size, with most being less than 500 pm in diameter, and reported biofilm thicknesses range from 40-1200 pm, with 100-200 pm being typical (Fan, 1989). 

As general rules, levels of 5-12 HP/1000 gal are typical of aerobic fermentation vessels, and 1-3 HP/1000 gal of aerobic waste treatment concentrations and oxygen requirements of the microorganisms arc different in the two kinds of processes. 

At NSF, a great deal of work is done on the development and implementation of NSF standards and criteria for health-related equipment. The majority of NSF standards relate to water treatment and purification equipment, products for swimming pool applications, plastic pipe for potable water as well as drain, waste, and vent (DWV) uses, plumbing components for mobil homes and recreational vehicles, laboratory furniture, hospital cabinets, polyethylene refuse bags and containers, aerobic waste treatment plants, and other products related to environmental quality. 

A bioreactor is a vessel in which biochemical transformation of reactants occurs by the action of biological agents such as organisms or in vitro cellular components such as enzymes. This type of reactor is widely used in food and fermentation industries, in waste treatment, and in many biomedical facilities. There are two broad categories of bioreactors fermentation and enzyme (cell-free) reactors. Depending on the process requirements (aerobic, anaerobic, solid state, immobilized), numerous subdivisions of this classification are possible (Moo-Young, 1986). 

Related Calculations. The majority of gas-dispersion applications are sized on the basis of power per volume. In aerobic fermentation, levels of 5 to 12 hp per 1000 gal (1 to 2.4 kW/m3) are typical, while for aerobic waste treatment, levels of 1 to 3 hp per 1000 gal (0.2 to 0.6 kW/m3) are more common, primarily because of the concentrations and oxygen requirements of the microorganisms. For more on fermentation, see Section 17. 

Compressed air is mainly used to operate pneiunatic instruments and control valves. Air is also used in aerobic fermentations for the production of chemicals and dmgs and in biological waste treatment. 

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