Disinfection interference in wastewaters by natural organic nitrogen compounds

Article Abstract:

High concentrations of natural organic nitrogen compounds cause disinfection interferences in wastewaters. This was the experience of a wastewater treatment plant in Hampton Roads, VA, which handles sizable amounts of brewery waste. To confirm that the compounds are responsible for the interferences, brewery effluent was mixed with different wastewaters to form mixtures with differing chemical features. After chlorination at uniform levels, fecal coliform levels were measured. Mixtures with high ratios of total organic nitrogen to ammonia (TON/NH3) were poorly disinfected by aqueous chlorine. The disinfection ate also tended to decline with increasing TON/NH3 ratios.

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New purification technique for the removal of organics from aqueous solutions using silicone polymers

Article Abstract:

Silicone's permeability and absorption characteristics have recommended it for use in a new method of removing organic contaminants in an aqueous solution. The silicone polymer is used in the form of hollow fibre membranes, and issues such as wall thickness, tube length and temperature have been taken into account. The experiments have shown that it is possible to use hollow fibre membranes to purify water by removing organics from it, and the tubing is not limited in capacity. Research will aim at building a larger model capable of handling at least 400 gal/day.

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Removal of organic dye (Direct Blue) from synthetic wastewater by adsorptive bubble separation techniques

Article Abstract:

A recent study looked at adsorptive bubble techniques, including ion flotation and adsorbing colloid flotation, as alternative treatments for dye wastewater. The experiments used C.I. Direct Blue 1, an anionic dye, and the results indicated that adsorbing colloid flotation and ion flotation both have potential in removing organic dye from wastewater. Solvent sublation gives similar results to ion flotation, but its performance was not improved by adding paraffin oil. Further tests are required before this technology can be used on an industrial scale.

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