This progress report by the Filtration Com. of AWWA summarizes the state‐of‐the‐art related to the backwashing of granular filters and suggests research needs to the AWWA Com. of Research.
This article discusses a study to determine and evaluate the properties of synthetic organic polyelectrolytes for coating diatomite. Three cationic polyelectrolytes were tested and evaluated in terms of the amount needed to form a coating, the effect of the coatings on the hydraulic permeability of the filter cake formed, and the effect on the properties of the coated media of the pH of the water being filtered. Those coated media that were not made materially less permeable by the coating will be field tested to evaluate their effectiveness for removing suspended solids from water.
Accidental spread of potentially toxic gases, fumes, and particulate chemicals has been reported recently in various cities throughout the country and appears to be on the increase throughout the world in the past few years. Moreover, cerebral trauma, septic shock (ARDS), and environmental pulmonary edema from drug intoxication have been commonly encountered. Newer modalities of treatment include selective [corrected] fiber optic bronchoscopy, constant positive airway pressure mask, administration of surfactant, pentoxifylline, and use of newer experimental agents such as nitrous oxide, antitumor necrosis factor (ATNF), and extracorporeal carbon dioxide with low-frequency positive pressure (ECCO2R-LFPPV). The future holds promise for probable reductions in both morbidity and mortality rates of this ubiquitous occupational and environmental health problem, which is of global importance.
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