Mechanical aeration modification

Comminution Shredding. A mechanical treatment process which cuts large pieces of waste into smaller pieces so that they won t plug pipes or damage equipment. Contact stabilization Contact stabilization is a modification of the conventional activated sludge process. In contact stabilization, two aeration tanks are used. One tank is for separate reaeration of the return sludge for at least four hours before it is permitted to flow into the other aeration tank to be mixed with the primary effluent requiring treatment. 

In aerated environments, the potential gradient inside the crack tends to inhibit outward diffusion of sulfide and this leads to EAC over a larger range of loading conditions, particularly at lower frequencies [Fig. 5-25 (Van der Sluys, 1988)]. Indeed, recent experiments have provided direct evidence of this mechanism by analysis and controlled modification of the crack tip environment (Young and Andresen, 1995). 

The effect of ionizing radiation (x or y rays) on tryptophan or on tryptophan-containing proteins in aerated aqueous solution is seemingly to bring about partial conversion of tryptophan to formylkynurenine (5, 206, 300). The oxidizing species are presumed to be hydroxy and hydroperoxy radicals. Oxindolylalanine does not seem to be an intermediate in the reaction. Suggested mechanisms (206, 300) propose 2-hydroxy-3-hydroperoxyindoline (86) as an intermediate. However, in the light of recent theories on tryptophan oxidation, which were discussed in other sections a modification of the above discussed mechanism can be also proposed which involves hydroperoxyindolenine as an intermediate. 

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