A STUDY ON THE EFFICIENCY OF HORIZONTAL FLOW ROUGHING FILTRATION IN ORGANIC MATERIALS REMOVAL FROM WATER USING POWDERED ACTIVATED CARBON

摘要

For an effective evaluation of Horizontal Roughing Filtration (HRF) performance in Total Organic Carbon (TOC) removal from water with powdered activated carbon injection, a pilot study was arranged using a complex pilot system including raw water production installations, injection units, rapid mixing and a three-compartment HRF unit with a changed bottom structure for continuous deposit removal capacity, effective filter cleaning and head loss control. The results showed that in the simple HRF, by injecting around 60 to 70 mg/l activated carbon powder, the process of TOC removal in the ordinary entering concentrations of natural water (less than 10 mg TOC per liter) amounts to 75 per cent; while by adding one coagulation unit with a limited injection of coagulants at the entrance of filter (Direct Horizontal flow Roughing Filtration (DHRF)), the removal efficiency increases up to 90 per cent.