Biological growth

Ozone caimot be employed for the disinfection of distributed water because of its short lifetime. Unless removed from the treatment plant, the presence of low molecular weight, oxygenated, and biodegradable organics that ozone produces can promote biological growth. 

Hydrogen peroxide is also used as a treatment to clean wells of biological growth. One treatment is to pour a 0.5% solution into the well and allow it to sit for four hours after which pumping is resumed (31). Some treatments use solution concentrations as high as 10% to remove biofouling from wells (16). 

Major factors affecting biological growth are temperature, nutrient availability. 

Tuberculation occurs in aqueous solutions. Mounds form over metal surfaces providing for concentration differences, favorable environments for biological growth, and an increase in acidity leading to hydrogen formation. 

Typically RO systems are preceded by pretreatment units to remove suspended solids/colloidal matter and add chemicals that control biological growth and reduce scaling. Membranes are typically made of synthetic polymers coated on a backing (skin). Examples of membrane materials include polyamides, cellulose acetate and sulfonated polysulfone. 

Despite the benefits of blow-down, however, chemical, electrostatic, or electronic treatment of the water is often required to prevent scale formation, corrosion, or biological growth. When treatment is required, or anticipated to be required, the services of a reliable water treatment company should be obtained. ... 

Biological growth can present a potentially hazardous fouling, since it can provide a stickier surface with which to bond other fouling sources. In many cases, however, treatment of the fluid can reduce the amount of biological growth. The use of germicides or poisons to kill bacteria can help. 

If the water is found fit for consumption, with respect to both its mineral and biological content, the problem of sanitization can still arise. Public supply invariably has a very small residual chlorine level. This suppresses biological growth and maintains water quality even when the line is stagnant. As with other forms of treatment, the scale of private supply is usually too small to allow good control of chlorinating equipment. 

One method of operating a non-chlorinated supply safely is to ensure that the line runs constantly to waste, as do very old drinking fountains. This avoids biological growth that can accumulate in stagnant water. Dead legs in the piping system are always undesirable, especially in such cases. 

Liquid polymers can support biological growths. Maintain good housekeeping practice to reduce the risk of contamination. 

Southwest Foundation for Research and Education, Division of Biological Growth and Development, Department of Biochemistry, San Antonio, Texas 78284. 

Becker, R. 0. Electrochemical Mechanisms and the Control of Biological Growth Processes 10... 

To discover and analyze the mathematical basis for the generation of complexity, one must identify simple mathematical systems that capture the essence of the process. Cellular automata are a candidate class of such systems. Cellular automata promise to provide mathematical models for a wide variety of complex phenomena, from turbulence in fluids to patterns in biological growth. 

Topics in the present book on chemistry and life science include studies of atoms and molecules in motion, the development of new processes and materials, nature s secrets of biological growth and form, physical techniques in biology, progress in understanding the human body and mind, and the computer modelling ofthe human heart. 

Control of Biological Growth Processes Beden, B. Electrocatalytic Oxidation of Oxygenated 22... 

Hydrogen peroxide keeps the well free of heavy biological growth, thus reducing clogging problems. 

Biological growth is the result of the coupled synthesis-endogenous respiration reactions. The net result can be expressed as... 

Chemicals are added to the circulation system to prevent fouling. Dispersants are added to prevent deposit of solids, corrosion inhibitors to prevent corrosion and biocides to inhibit biological growth. 

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