The use of treated phenolic industrial effluents for process water supply of coking plants

Summary

The technology of using phenolic effluents after activated sludge treatment for process water supply at coking plants for wet scrubbing of flue gases from drying shops of coal-cleaning facilities, and also in coke departments for flushing cyclones for aspiration system washing and coal flotation is considered. It is shown that the use of the entire volume of the effluent after biochemical remediation in coking plant process water supply makes it possible to improve by 23–26% the efficiency of dust separation equipment eliminating coal and coke from atmospheric emissions; to provide for tertiary treatment of wastewater by adsorption on coke and coal dust. The introduction of the technology allows saving 2.1 mln m3 of process water annually.

Key words

coking plant , biochemical cleared sewage , aspiration system , scrubber , purification of atmospheric emissions , coal and coke dust , coal flotation

Designing the aeration system of grit chambers

Summary

The procedure of designing the aeration system for grit chambers including energy relations and formulas for calculating the diameter and rate of air bubbles ascent is presented. The suggested relationships showed close agreement of calculated and experimental values of the transverse water circulation rate in the aerated grit chamber. On the basis of domestic and foreign recommendations on the given design procedure the bottom velocity of water circulating flow in typical aerated grit chambers was calculated. It was shown that the use of fine bubble aerators provides for 30–50% air saving.

Key words

air flow rate , grit chamber , aeration system , flow bottom velocity

Pipeline integrity and evaluation of the water distribution network reliability in Iraq cities

Summary

The results of evaluating the integrity of water distribution networks in Iraq cities are presented. It is shown that under conditions of limited economic opportunities, material and technical resources the program of upgrading the networks shall be optimized with the use of reliability indices and correction of dates and methods of implementing the action plan.

Key words

water supply , operation reliability , pipeline damages