Optimization of designing the systems for waste water purification from waterworks operating with low-turbidity waters

Summary

The issues of designing schemes for processing wash water of rapid filters (contact clarifiers), sludge from wash water treatment facilities and sludge from sedimentation facilities are considered. The results of a study of wash water of rapid filters at the water treatment plants operating with PolyDADMAC organic coagulant-flocculant are presented; the qualitative indicators of the sludge from the sedimentation tanks at these facilities are given. Options for wash water recycling are considered, such as supplying to the headworks and washing contact clarifiers, as well as process water supply (road washing, production needs of industrial enterprises, etc.), and agricultural irrigation. The water quality indicators for each of the recycling options are given, and an algorithm for selecting a process flow scheme is presented that will provide for the required effluent quality standard by adjusting the treatment scheme. Options for the utilization of sludge of sedimentation tanks and wash water treatment facilities as potting soils, stone and ceramic building materials are presented. The criteria for choosing a utilization option and the algorithm for choosing process flow schemes are presented. The proposed approach to designing schemes for wash water and sludge treatment simplifies their selection at the stage of a new design or upgrade.

Key words

sludge , rapid filter , wash water , flow chart , design algorithm