Estimating kinetic constants for the process of biochemical treatment of oil refinery wastewater

Summary

The results of studies carried out under periodic conditions at the wastewater biological treatment facilities of the Novokouibyshevsky, Kouibyshevsky, Syzransky and Atchinsky oil refineries are presented. With reference to the measured oxygen consumption rate the values of the maximum oxidation rate, Michaelis constants and coefficient of inhibition by activated sludge degradation products were obtained. Kinetic constants depend on the raw wastewater composition and are subject to daily fluctuations. The obtained values can be used in designing aeration tanks for oil refinery wastewater treatment.

Key words

wastewater , biological treatment , activated sludge , oil refinery , kinetic constant

Chrome containing wastewater treatment with a chemical produced from grinding wastes

Summary

Process designs of diluted and concentrated chrome containing wastewater treatment on the principle of resource recovery are suggested. A new type reducing agent produced from grinding sludge of metalworking production was developed. The process of hexavalent chrome ion recovering with grinding wastes was investigated. The values of wastewater reducing capacity of some chemical production plants are presented. The technique of express assessment of chemical sludge and slurry reducing properties was developed.

Key words

chrome containing wastewater , grinding sludge , reducing capacity , chemical consumption

Indirect determination of water sludge properties

Summary

In the course of investigating sludge properties and determining sludge shear strength a conversion factor was specified that allowed adapting laboratory data to the measurements obtained directly at the facilities (horizontal settling tanks). The curves of changes in sludge consistency depending on sludge shear strength values are presented.

Key words

sludge from water treatment plant , horizontal settling tank , shear strength , sludge consistency , conversion factor